U.S. Department of the Interior

U.S. Geological Survey

Scientific Investigations Report 2007–5122

Concentrations of Glyphosate, Its Degradation Product,

Aminomethylphosphonic Acid, and Glufosinate in

Ground- and Surface-Water, Rainfall, and Soil Samples

Collected in the United States, 2001–06

CANADA 

MEXICO

UNITED STATES

45°

35°

105° 100° 95°

70°

Gulf of Mexico

Atlantic Ocean

NAWQA Study Units

Glufosinate Glyphosate

Aminomethylphosphonic acid

O O

OH

OH

HO

P

H

N

NH2

O O

OH

OH

HO

P

H

N

H2N

O

OH

OH

P

Concentrations of Glyphosate, Its Degradation 

Product, Aminomethylphosphonic Acid, and 

Glufosinate in Ground- and Surface-Water, 

Rainfall, and Soil Samples Collected in the 

United States, 2001–06

By Elisabeth A. Scribner, William A. Battaglin, Robert J. Gilliom, and Michael T. Meyer

Scientific Investigations Report 2007–5122

U.S. Department of the Interior

U.S. Geological Survey
U.S. Department of the Interior

DIRK KEMPTHORNE, Secretary

U.S. Geological Survey

Mark D. Myers, Director

U.S. Geological Survey, Reston, Virginia: 2007

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U.S. Government.

Although this report is in the public domain, permission must be secured from the individual copyright owners to 

reproduce any copyrighted materials contained within this report.

Suggested citation:

Scribner, E.A., Battaglin, W.A., Gilliom, R.J., and Meyer, M.T., 2007, Concentrations of glyphosate, its degradation 

product, aminomethylphosphonic acid, and glufosinate in ground- and surface-water, rainfall, and soil samples collected in the United States, 2001–06: U.S. Geological Survey Scientific Investigations Report 2007–5122, 111 p.
iii

Contents

Abstract...........................................................................................................................................................1

Introduction.....................................................................................................................................................1

Purpose and Scope ..............................................................................................................................1

Description of Study Sites...................................................................................................................2

Description and Use of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate .............2

Acknowledgments................................................................................................................................4

Sampling Methods and Procedures...........................................................................................................5

Sampling Sites.......................................................................................................................................5

Sample Collection and Processing....................................................................................................5

Analytical Methods and Procedures..........................................................................................................6

Liquid Chromatography/Mass Spectrometry and Liquid Chromatography/Tandem Mass 

Spectrometry ...........................................................................................................................6

Materials .......................................................................................................................................7

Derivatization of Samples...........................................................................................................7

Water ..................................................................................................................................7

Soil ..................................................................................................................................8

Online Solid-Phase Extraction...................................................................................................8

Liquid Chromatography/Mass Spectrometry..........................................................................8

Liquid Chromatography/Tandem Mass Spectrometry...........................................................8

Quality Assurance..........................................................................................................................................8

Sample Collection.................................................................................................................................8

Internal Standards................................................................................................................................8

Laboratory Blank...................................................................................................................................8

Laboratory Spike...................................................................................................................................9

Instrumental Analysis Quality Control...............................................................................................9

Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate ...............................9

State Cooperative Studies...................................................................................................................9

National Stream Quality Accounting Network (NASQAN) Program............................................9

National Water-Quality Assessment (NAWQA) Program..............................................................9

Toxic Substances Hydrology (Toxics) Program ...............................................................................9

Reconnaissance Data From 51 Streams in Nine Midwestern States...............................12

Lower Mississippi River Basin ................................................................................................12

Sensitive Environments Study .................................................................................................12

Leary Weber Ditch Basin, Indiana ..........................................................................................12

Summary........................................................................................................................................................12

References Cited..........................................................................................................................................13

Data Tables ...................................................................................................................................................15

Figures

1. Chemical structures of glyphosate, its degradation product, aminomethylphosphonic 

acid, and glufosinate....................................................................................................................2
iv

2. Map showing location of 10 States where samples were collected for analysis of 

glyphosate, its degradation product, aminomethylphosphonic acid, and glufosinate, 

2001–06 ...........................................................................................................................................3

3. Map showing location of streamflow-gaging stations where samples were collected 

for analysis of glyphosate, its degradation product, aminomethylphosphonic acid, and 

glufosinate as part of the U.S. Geological Survey National Stream Quality Accounting 

Network Program, 2002 ...............................................................................................................4

4. Map showing location of National Water-Quality Assessment Program study units 

where samples were collected for analysis of glyphosate, its degradation product, 

aminomethylphosphonic acid, and glufosinate, 2001–06.......................................................5

5. Map showing location of Midwest Corn Belt and Toxic Substances Hydrology Program 

studies where samples were collected for analysis of glyphosate, its degradation 

product, aminomethylphosphonic acid, and glufosinate, 2001–06.......................................6

6. Graph showing glyphosate use in nine Midwestern States, 1989–2003 .............................7

Tables

1. Example of analytical sequence for use in determining glyphosate, aminomethylphosphonic acid, and glufosinate in water samples.....................................................................10

2. Summary of glyphosate, aminomethylphosphonic acid, and glufosinate concentrations 

analyzed by the U.S. Geological Survey Organic Geochemistry Research Laboratory, 

Lawrence, Kansas, for ground-water, surface-water, rainfall, and soil samples collected for State cooperative, National Stream Quality Accounting Network Program, 

National Water-Quality Assessment Program, and Toxic Substances Hydrology Program studies, 2001–06................................................................................................................11

3. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in 

State cooperative surface- and ground-water studies, 2001–06 .......................................16

4. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in 

National Stream Quality Accounting Network Program surface- and ground-water 

studies, 2002 ................................................................................................................................37

5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in 

National Water-Quality Assessment Program surface- and ground-water studies, 

2001–06 .........................................................................................................................................38

6. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in 

Toxic Substances Hydrology Program studies, 2001–06......................................................84
Conversion Factors

Multiply By To obtain

acre 4,047 square meter (m2)

liter (L) 0.2642 gallon (gal)

microgram (μg) 3.527 x 10-8 ounce (oz)

micrometer (μm) 3.937 x 10-5 inch (in.)

milligram (mg) 3.53 x 10-5 ounce (oz)

pound (lb) 0.45359 kilogram (k)

pound per square inch (lb/in2) 0.07031 kilogram per square centimeter (kg/cm2)

square mile (mi2) 2.590 square kilometer (km2)

Temperature in degrees Celsius (°C) may be converted to degrees Fahrenheit (°F) as follows:

°F=(1.8×°C)+32.

Temperature in degrees Fahrenheit (°F) may be converted to degrees Celsius (°C) as follows:

°C=(°F-32)/1.8.

Abbreviated Water-Quality Units

gram (g)

microgram per kilogram (μg/kg)

microgram per liter (μg/L)

microgram per milliliter (μg/mL)

microliter (μL)

milligram per liter (mg/L)

milliliter (mL)

milliliter per minute (mL/min)

molar (M)

parts per billion (ppb)
vi

Other Abbreviations Used in This Report

ACN acetonitrile

AMPA aminomethylphosphonic acid

AP atmospheric pressure ionization

COB carry-over blank

EDTA ethylenediaminetetraacetic acid

FMOC fluorenylmethylchloroformate

GC/MS gas chromatography/mass spectrometry

HCl hydrochloric acid

HPLC high-performance liquid chromatography

KOH potassium hydroxide

LC liquid chromatography

LC/MS liquid chromatography/mass spectrometry

LC/MS/MS liquid chromatography/tandem mass spectrometry

MRL minimum reporting level

NaOH sodium hydroxide 

NASQAN National Stream Quality Accounting Network

NAWQA National Water-Quality Assessment Program

OGRL Organic Geochemistry Research Laboratory

SPE Solid-phase extraction

Toxics Toxic Substances Hydrology Program

USGS U.S. Geological Survey

Definition

Minimum reporting level (MRL)–smallest measured concentration of a constituent that may be 

reliably reported by using a given analytical method (Timme, 1995).

Datum

Horizontal coordinate information is referenced to the North American Datum of 1983 (NAD 83).
Concentrations of Glyphosate, Its Degradation Product, 

Aminomethylphosphonic Acid, and Glufosinate in Groundand Surface-Water, Rainfall, and Soil Samples Collected 

in the United States, 2001–06

By Elisabeth A. Scribner1, William A. Battaglin2, Robert J. Gilliom3, and Michael T. Meyer1

Abstract

The U.S. Geological Survey conducted a number of studies from 2001 through 2006 to investigate and document the 

occurrence, fate, and transport of glyphosate, its degradation 

product, aminomethylphosphonic acid (AMPA), and glufosinate in 2,135 ground- and surface-water samples, 14 rainfall 

samples, and 193 soil samples. Analytical methods were 

developed to detect and measure glyphosate, AMPA, and glufosinate in water, rainfall, and soil. Results show that AMPA 

was detected more frequently and occurred at similar or higher 

concentrations than the parent compound, glyphosate, whereas 

glufosinate was seldom found in the environment. Glyphosate 

and AMPA were detected more frequently in surface water 

than in ground water. Trace levels of glyphosate and AMPA 

may persist in the soil from year to year. The methods and data 

described in this report are useful to researchers and regulators 

interested in the occurrence, fate, and transport of glyphosate 

and AMPA in the environment. 

Introduction

Nonpoint-source contamination of water resources from 

herbicides became a major water-quality concern during the 

1990s in the United States. To address this issue, numerous 

studies of ground and surface water, rainfall, and soil were 

completed by the U.S. Geological Survey (USGS) (Scribner 

and others, 2005). The Organic Geochemistry Research Laboratory (OGRL) was established by the USGS in Lawrence, 

Kansas, to identify new or seldom-studied contaminants that 

may have deleterious effects on water quality or may be useful 

indicators of geochemical transport processes and to conduct 

research on the fate and transport of contaminants in the 

hydrogeologic system. 

 To accomplish this, analytical methods have been 

developed by OGRL using solid-phase extraction (SPE), gas 

chromatography/mass spectrometry (GC/MS), liquid chromatography/mass spectrometry (LC/MS), and liquid chromatography/tandem spectrometry (LC/MS/MS) to detect and 

measure pesticides, antibiotics, and their degradation products, 

including glyphosate, its degradation product, aminomethylphosphonic acid (AMPA), and glufosinate in ground and 

surface water, rainfall, and soil throughout the United States as 

identified in this report. 

Glyphosate, often referred to as RoundupTM, currently 

(2007) is the most commonly used agricultural herbicide in the 

United States and the world. Glyphosate herbicides have been 

popular since first marketed in 1974. In agriculture, glyphosate 

is used extensively with genetically modified herbicide-tolerant crops, but it also is commonly used around homes in yards, 

gardens, and other nonagricultural areas (Williams and others, 

2000; Cox, 2004). In the past 10 years, it has become one of 

the most extensively used herbicides for weed control in corn 

and soybeans in the United States. 

Glufosinate, a shortened name for glufosinate-ammonium 

salt, is a broad-spectrum, contact herbicide first introduced in 

the United States in 1997 and is used to control a wide range 

of weeds after the crop emerges or for total vegetation control. 

Glufosinate herbicides also are often used to desiccate crops 

before harvest (Friends of the Earth, 2001). Use of glufosinate 

is expected to increase substantially in the next few years due 

to the cultivation of crops, such as corn and soybeans, that 

have been genetically engineered to tolerate it (Cox, 1996). 

Purpose and Scope

The purpose of this report is to present methods and 

data that document the occurrence and concentrations of 

glyphosate, its degradation product, AMPA, and glufosinate 

(chemical structures shown in fig. 1) in 873 ground- and 

1,262 surface-water samples, 14 rainfall samples, and 193 soil 

1

U.S. Geological Survey, Lawrence, Kansas.

2

U.S. Geological Survey, Lakewood, Colorado.

3

U.S. Geological Survey, Sacramento, California.
samples collected from 2001 through 2006. These samples 

were collected as part of several ongoing USGS studies being 

conducted throughout the United States, including studies 

conducted with Federal and State cooperative agencies and 

other USGS programs such as the National Stream Quality Accounting Network (NASQAN) Program, the National 

Water-Quality Assessment (NAWQA) Program, and the Toxic 

Substances Hydrology (Toxics) Program. The data in this 

report were collected from studies funded, in part or whole, by 

these programs. This report also includes a chemical description of glyphosate, AMPA, and glufosinate and documents 

the sample-collection and processing methods in addition to 

laboratory and analytical methods.

Description of Study Sites

Water samples were collected and analyzed as part of 

various USGS studies listed below.

USGS cooperative studies with various Federal and State 

agencies investigated glyphosate, AMPA, and glufosinate 

1.

transport in aquatic ecosystems (fig. 2). In some cases, 

these cooperative studies evaluated agricultural contamination of ground and surface water from nonpoint and 

distributed point sources. For example, herbicide-related 

samples were collected in 2002 in cooperation with the 

U.S. Environmental Protection Agency to study urban 

contributions of glyphosate and AMPA to streams in the 

United States (Scribner and others, 2003).

The NASQAN program was established to develop 

a long-term water chemistry data set from five major 

river basins—the Colorado, Columbia, Mississippi, Rio 

Grande, and Yukon (fig. 3). In 2002, water samples from 

four streamflow-gaging stations in the Mississippi River 

Basin were collected for analysis (fig. 3) and results for 

glyphosate, AMPA, and glufosinate are reported herein. 

These data are important in characterizing baseline 

hydrology conditions and variations in chemical and 

sediment concentrations that occur throughout the year, 

during different seasons, during periods of high and low 

streamflow, and under different conditions of land use 

(Hooper and others, 1997; Coupe and Goolsby, 1999; 

Hooper and others, 2001; U.S. Geological Survey, 2006a).

NAWQA includes investigations of 51 major river basins 

and aquifer system study units (fig. 4) that provide the 

framework for national and regional status and trends 

in the quality of the Nation’s ground- and surface-water 

resources (U.S. Geological Survey, 2003; Gilliom and 

Hamilton, 2006; Gilliom and others, 2006). Data for 

glyphosate, AMPA, and glufosinate from 23 of the 

51 study units are included in this report.

The USGS Toxic Substances Hydrology (Toxics) Program, Pesticide Research Group, provides unbiased 

scientific information on the occurrence, movement, flux, 

fate, and effects of agricultural chemicals in the Nation’s 

hydrologic environments. The program includes development and quantification of methods to measure contaminants and their degradation products at concentrations 

low enough to understand fate and transport in hydrologic 

systems (Buxton, 2000). An example of studies funded 

by Toxics includes herbicide and degradation product 

concentrations evidenced during a reconnaissance of 

51 streams in nine Midwestern States in the Midwest 

Corn Belt during 2002 (fig. 5; Scribner and others, 2003; 

Battaglin and others, 2005; Kolpin and others, 2006).

Description and Use of Glyphosate, 

Aminomethylphosphonic Acid, and Glufosinate

Glyphosate [N-(phosphonomethyl)-glycine] is a nonselective, postemergence herbicide used for perennial weed 

control. Glyphosate was developed by J.E. Franz, Monsanto 

Corp., in 1971 and was released commercially in 1974 (Iowa 

State University, 1997). In the early 1980s, it became the first 

2.

3.

4.

Glyphosate

Glufosinate

Aminomethylphosphonic acid (AMPA)

O O

OH

OH

HO

P

H

N

NH2

O O

OH

OH

HO

P

H

N

H2N

O

OH

OH

P

Figure 1. Chemical structures of glyphosate, its degradation product, 

aminomethylphosphonic acid, and glufosinate.

   Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
individual pesticide with worldwide sales of over 1 billion 

dollars (Iowa State University, 1997). Glyphosate use in the 

United States rapidly increased with the introduction of genetically modified glyphosate-resistant soybeans in 1997 and corn 

in 1998. Glyphosate also is used extensively in yards, gardens, 

parks, and other nonagricultural areas (Cox, 2004). Glyphosate 

was the world’s most extensively used herbicide in 2000 (Baylis, 2000). In the United States, estimated usage is between 

103 and 113 million lbs (Cox, 2004; Kiely and others, 2004). 

Herbicide use is an important factor affecting the concentrations of herbicides measured in Midwestern streams (Battaglin 

and Goolsby, 1999; Scribner and others, 2000; Battaglin and 

others, 2005). About 55 million lbs of glyphosate were applied 

to agricultural land in nine Midwestern States (fig. 6) during 

2003 compared to atrazine, which decreased to about 40 million lbs during the same timeframe (Scribner and others, 2005; 

U.S. Department of Agriculture, 2006). 

Glyphosate is absorbed directly through plant leaves and 

rapidly spreads throughout the plant. It blocks the activity 

of an enzyme used by plants to make amino acids. Without 

these amino acids, the plant cannot make proteins required 

for various life processes, resulting in the death of the plant 

(Monsanto Company, 2002; Cox, 2004). Glyphosate is known 

to bind tightly to particles that are adsorbed to soils that may 

prevent excessive leaching or being taken up from the soil by 

nontarget plants (Carlisle and Trevors, 1988). Glyphosate is 

degraded primarily by microbial processes producing AMPA 

[alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid] 

(Sprankle and others, 1975; Rueppel and others, 1977). Studies show that glyphosate has a water solubility of 12,000 to 

900,000 mg/L at 20oC and that the half-life can vary from 2 to 

174 days (Extension Toxicology Network, 1994).

Glufosinate [2-amino-4-(hydroxy-methylphosphinyl) 

butanoic acid], a broad-spectrum contact herbicide used to 

control a wide range of weeds after the crop emerges or for 

total vegetation control on land not used for cultivation, is 

produced by AgrEvo, a joint venture by the German chemical corporations, Hoechst and Schering. The herbicide was 

first introduced in Japan and the United Kingdom in 1984. 

Registration in the United States was in 1993. Glufosinate is 

Figure 2. Ten States where samples were collected for analysis of glyphosate, its degradation product, aminomethylphosphonic acid, and glufosinate, 2001–06.

Introduction 

EXPLANATION

State where samples were collected—Results

 are shown in table 3

120°

115°

110° 105° 100° 95°

90° 85°

75°

70°

80°

0 125 250 500 MILES

0 125 250 375 500 KILOMETERS

375

45°

40°

35°

30°

25°

Base from U.S. Geological Survey digital data, 1:2.000,000, 1991

Alber Equal Area Projection

Standard parallels 29°30' and 45°30’, central meridian -96°

Horizontal coordinate information is referenced to the North American

 Datum of 1983 (NAD 83)

CANADA

MEXICO

Gulf of Mexico

Atlantic Ocean

Pacific

Ocean

UNITED STATES

Maryland

Delaware

New Jersey

Connecticut

Rhode

Island

Massachusetts

New Hamphshire

Vermont Maine

Pennsylvania

New York

Iowa

Missouri

Arkansas

Louisiana

Mississippi Alabama

Tennessee

Illinois

Wisconsin

Michigan

Indiana Ohio

Virginia

North

Carolina

South

Carolina

Georgia

Florida

Kentucky

West Virginia

Montana

Wyoming

New Mexico

Texas

Oklahoma

Kansas

Nebraska

South Dakota

North Dakota Minnesota

Colorado

Oregon

Nevada

Idaho

Utah

Arizona

Washington

California
registered for use in more than 40 countries. AgrEvo introduced a glufosinate formulation for use on crops resistant to 

glufosinate in the late 1990s (Pesticide Action Network UK, 

1998).

Studies show that 1,370 g of glufosinate can be dissolved 

in 1 L of water and the half-life will vary from 12 to 70 days, 

with an average of about 40 days (Cox, 1996). Usage of 

glufosinate in the United States was 847,000 lbs during 2003 

(U.S. Department of Agriculture, 2006) and included nine 

States (California, Iowa, Michigan, Minnesota, North Dakota, 

Oregon, South Dakota, Washington, and Wisconsin). 

Acknowledgments

The authors wish to acknowledge the USGS scientists 

and hydrologic technicians who provided essential support 

to the studies just described by identifying candidate stream 

0 125 250 500 MILES

0 125 250 375 500 KILOMETERS

375

Base from U.S. Geological Survey digital data, 1:2.000,000, 1991

Alber Equal Area Projection

Standard parallels 29°30' and 45°30’, central meridian -96°

Horizontal coordinate information is referenced to the North American

 Datum of 1983 (NAD 83)

EXPLANATION

115°

110°

105°

100° 95°

90° 85°

75°

70°

80°

120°

45

40°

35°

25°

30°

50°

Rio Grande

Basin

Mississippi River

Basin

Colorado River Basin

Pecos River

Red River

Gila River

Green River

Colorado River

Snake River

Willamette River Yellowstone River

Missouri River

Mississippi River

South Platte

North Platte Platte River Wabash River

Ohio River

Arkansas River Mississippi River

Atchafalaya River

Rio Grande

Columbia River

Basin

Columbia River

Little Colorado

River

Minnesota River

Tennessee River

Gulf of Mexico

Atlantic Ocean

Pacific

Ocean

Pacific Ocean

Bering Sea

CANADA

MEXICO

UNITED STATES

03612500

U.S. Geological Survey streamflow-gaging

 station and number

03612500

07022000

07288955

07373420

Gulf of Alaska

180°

170°

160° 150°

140°

130°

50°

60°

70°

0 200 400 MILES

0 200 400 KILOMETERS

Yukon River

Basin

Yukon River

CANADA

San Juan

River

Figure 3. Location of streamflow-gaging stations where samples were collected for analysis of glyphosate, its degradation product, aminomethylphosphonic acid, and glufosinate as part of the U.S. Geological Survey National Stream Quality Accounting Network Program, 2002.

 Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
sites across the United States and in collecting and processing 

stream samples. In addition, thanks go to E. Michael Thurman (retired USGS research scientist) and Edward A. Lee 

(former OGRL staff member) for their important contributions 

in developing and interpreting the analytical methods used on 

samples described in this report. 

Sampling Methods and Procedures

Sampling Sites 

Drainage basins for surface-water sampling sites ranged 

in size from just a few acres to one of the largest river basins 

in the world (the Mississippi) and everywhere in-between. 

The data presented in this report are not meant to be a representative examination of the occurrence of glyphosate in 

the Nation’s water but rather are a compilation of individual 

studies conducted for various purposes and with different 

objectives. The interpretation of these data as a whole should 

reflect this fact. However, these data do give an indication of 

the breadth and scope of the occurrence of glyphosate in the 

Nation’s water from 2001–06.

Sample Collection and Processing

Hydrologic technicians collected water samples that 

accurately represent the water-quality characteristics of the 

ground water, surface water, rainfall, or soil at a given time or 

location following instructions of the USGS National Field 

Manual for Collection of Water-Quality Data (U.S. Geological Survey, 2006b). Sample-collection equipment was made 

of Teflon or stainless-steel material and was free of materials 

that might leach interfering compounds into water samples 

or absorb the target analytical compounds from the water 

samples. 

Ground-water samples were discharged directly into the 

filtering device through tubing connected to sample taps at 

water-supply wells or the discharge outlet on sampling pumps. 

Delmarva Peninsula

120°

45°

40°

35°

30°

25

115° 110° 105° 100° 95°

90° 85°

75°

70°

80°

Eastern Iowa Basin

Lower Illinois

River Basin

Central Nebraska

Basin

Upper Snake

River Basin

Puget Sound Basin

Las Vegas Valley, Carson, and Truckee

Basins

Lake Erie-Lake St. Clair Drainage

Long Island and

New Jersey Coastal

Basin

Connecticut, Housatonic, and

Thames River Basins

Potomac River Basin

Mississippi

Embayment

Apalachicola, Chattahoochee,

Flint River Basin

Great and

Little Miami

River Basins

0 125 250 500 MILES

0 125 250 375 500 KILOMETERS

375

Base from U.S. Geological Survey digital data, 1:2.000,000, 1991

Alber Equal Area Projection

Standard parallels 29°30' and 45°30’, central meridian -96°

Horizontal coordinate information is referenced to the North American

 Datum of 1983 (NAD 83)

EXPLANATION

Study unit for which data are

 included in this report

Study unit

South Platte

Basin

Willamette River

Basin

Central Columbia

Plateau Basin

Sacramento Basin

San Joaquin and Tulare

Basins

Trinity River

Basin

Georgia-Florida Coastal Plain

Albemarle-Pamlico

Drainage

Gulf of Mexico

Atlantic Ocean

Pacific

Ocean

CANADA 

MEXICO

UNITED STATES

White River Basin

Figure 4. Location of National Water-Quality Assessment Program study units where samples were collected for analysis of glyphosate, its degradation product, aminomethylphosphonic acid, and glufosinate, 2001–06.

Sampling Methods and Procedures 
The water samples from each surface-water site were composited in a single container and filtered through a nominal 

0.7-μm glass-fiber filter using a peristaltic pump. Filters were 

preconditioned with about 200 mL of sample water prior to 

collection of the sample. The filtrate for analysis was collected 

in baked 125-mL amber glass bottles with Teflon-lined lids. 

All samples were chilled immediately and shipped to OGRL 

and stored at approximately 4oC until analyzed.

Rainfall samples were collected by a refrigerated wetdeposition sampler as described in Baker and others (2006). 

Soil samples were collected at three depths at each site (for 

a total of nine samples per site for every sample-collection 

period). A soil core sampler was used to collect samples from 

0–6 in., 6–12 in., and 12–18 in. at each of the three randomly 

chosen sample locations. Clean aluminum sampling tubes 

were inserted in the core sampler and the first 6-in. section 

(0–6 in.) of soil was extracted. The section was removed from 

the sampling tube (with nitrile gloves) and placed in a labeled 

glass jar. Clean sampling tubes were inserted in the core 

sampler, and the second 6-in. section (6–12 in.) of soil was 

extracted from the same hole. The same procedure was used 

on the third 6-in. section (12–18 in.) of soil.

Analytical Methods and Procedures

Liquid Chromatography/Mass Spectrometry 

and Liquid Chromatography/Tandem Mass 

Spectrometry

The analytical method for glyphosate, AMPA, and glufosinate compounds in water is described in Lee and others 

(2002a,b) and is suitable for the determination of concentrations, using online SPE and LC/MS (from 2001 to 2004), and 

was modified to use an LC/MS/MS method in 2004.

District of Columbia

120°

115°

110° 105° 100° 95°

90° 85°

75°

70°

80°

0 125 250 500 MILES

0 125 250 375 500 KILOMETERS

375

Midwest Corn Belt

Leary Weber

Ditch Basin

Baton Rouge

45°

40°

35°

30°

25°

Base from U.S. Geological Survey digital data, 1:2.000,000, 1991

Alber Equal Area Projection

Standard parallels 29°30' and 45°30’, central meridian -96°

Horizontal coordinate information is referenced to the North American

 Datum of 1983 (NAD 83)

CANADA

MEXICO

Gulf of Mexico

Atlantic Ocean

Pacific

Ocean

UNITED STATES

EXPLANATION

Nine Midwestern States

Mississippi River glyphosate study

Sensitive environments study

Figure 5. Location of Midwest Corn Belt and Toxic Substances Hydrology Program studies where samples were collected for analysis of 

glyphosate, its degradation product, aminomethylphosphonic acid, and glufosinate, 2001–06.

   Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Materials

Analytical grade standards of glyphosate, AMPA, and 

glufosinate were obtained from ChemService, Inc. (West 

Chester, Pennsylvania) for use as internal standards. Stable 

isotope-labeled glyphosate (2-13C, 15N) purchased from 

Cambridge Isotope Laboratories (Andover, Massachusetts) 

was used as an internal standard for LC/MS method as 

described in Lee and others (2002a). Stable isotope-labeled 

[

13C2

, 15N – glyphosate (glyphosate +3)] and [13C, 15N, methylene-D2

 – AMPA (AMPA +4)] were purchased from GmbH 

Company (Germany). The second isotope-labeled AMPA [13C, 15N – AMPA (AMPA +2)] came from Cerfilliant Corporation (Round Rock, Texas). There was no stabilized isotopelabeled internal standard available for glufosinate. The internal 

standard cysteic acid was obtained from Sigma, St. Louis, 

Missouri. All solvents were high-performance liquid chromatography (HPLC) grade. 

Derivatization of Samples

Water

As described in Lee and others (2002a), each water 

sample (ground water, surface water, rainfall) was derivatized by dispensing 10 mL into two labeled, 19-mL, screwcapped plastic tubes. The sample in the tube labeled “standard 

addition” was fortified with 1 μg/L of each compound to be 

analyzed. Internal standard solutions were added to both tubes, 

the sample was buffered to pH 9.0 standard units by adding 

borate buffer, and after mixing, a solution of 9-fluorenylmethylchloroformate (FMOC) was added to all tubes. Derivatization was conducted in the dark in a water bath at 40o

C. After 

24 hours, the reaction was stopped and stabilized by adding 

2-percent phosphoric acid, then tubes were stored in a refrigerator at 4o

C until analyzed. 

1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 0

10

20

30

40

50

60

Glyphosate usage, in millions of pounds

Figure 6. Glyphosate use in nine Midwestern States, 1989–2003 (data from U.S. Department of Agriculture, 2006).

Analytical Methods and Procedures 
Soil

Soil samples were placed on an aluminum foil sheet, and 

a spatula was used to break up and mix the sample. Five grams 

(5 g) of soil sample were weighed into a labeled 50-mL plastic 

centrifuge tube using at least ten 0.5-g aliquots from different areas of the sample. Twenty-five milliliters (25 mL) of 

0.5 M potassium hydroxide (KOH) were added to the sample 

tube, which was placed on a mechanical shaker for 45 min 

at medium speed, then centrifuged for 10 min to extract the 

compounds. 

Five milliliters (5 mL) of the centrifuged KOH soil 

extracts were pipetted into a new labeled 50-mL centrifuged 

tube to which 5.1 mL of 0.5 M hydrochloric acid (HCl) were 

added. Five-tenths M HCl was added drop-wise until a pH of 

3.0 to 4.0 standard units was obtained. Ten milliliters (10 mL) 

of borate buffer were added by drop until pH was adjusted to 

9.0 standard units. The internal standard and FMOC solutions 

then were added to the sample eluate and placed in a 40oC 

water bath for 24 hours. The reaction was stopped and stabilized by adding 2-percent phosphoric acid, then tubes were 

stored in a refrigerator at 4oC until analyzed. 

Online Solid-Phase Extraction

A Prospekt automated online SPE instrument with the 

Triathlon autosampler (Spark-Holland, The Netherlands) were 

used to extract the samples. Each sample and the matching 

standard-addition sample were loaded into the sample tray 

of the autosampler. The SPE instrument were loaded with 

cartridges. The Prospekt had one cartridge clamp to rinse the 

cartridge and load the sample and another cartridge clamp to 

elute the previously prepared cartridge. The sample lines were 

rinsed and deactivated with a sodium hydroxide (NaOH) and 

ethylenediaminetetraacetic acid (EDTA) solution between 

samples. The SPE cartridge was rinsed with methanol and 

conditioned with reagent water, and then 10 mL of soil sample 

were loaded onto the cartridge from the autosampler at a 

rate of 2 mL/min. The cartridge was washed with reagent 

water at the same rate for 15 sec. The SPE cartridge then was 

eluted with 750 μL of acetonitrile (ACN) and by diverting the 

liquid chromatography (LC) mobile-phase stream through 

the cartridge. The mobile-phase composition was set to elute 

the compounds of interest and leave the excess derivatization 

reagent on the cartridge (Lee and others, 2002a).

Liquid Chromatography/Mass Spectrometry

Samples were analyzed on a Hewlett Packard (Wilmington, Delaware) model 1100 high-performance liquid chromatograph (HPLC) with autoinjector and mass spectrometry 

detector. The concentration of each compound was calculated 

by determining the ratio of the compound to the internal 

standard to the ratio of the same compound in the standardaddition sample minus the ratio of the sample. The sample and 

standard-addition sample were analyzed sequentially using the 

same method and instruments (Lee and others, 2002a). The 

reporting limit for the LC/MS method was 0.10 μg/L from 

2001 through 2004.

Liquid Chromatography/Tandem Mass 

Spectrometry

Samples were analyzed on an Agilent 1100 series liquid 

chromatography (LC) system (Wilmington, Delaware) and a 

Waters Quattro Micro atmospheric pressure ionization (API) 

tandem mass spectrometer (MS/MS) system with electrospray 

ionization in negative-ion mode (Milford, Massachusetts). 

A Luna C-18 (2) analytical column (Phenomenex, Torrance, 

California) was used to separate glyphosate, AMPA, and 

glufosinate. The LC column was equilibrated with the mobile 

phase approximately 2 hours prior to analysis. A reporting 

level of 0.02 μg/L for the LC/MS/MS method has been used 

since 2004.

Quality Assurance

Sample Collection

All water samples for these studies were collected either 

by or under the direction of USGS personnel in accordance 

with a written work plan for the study. Field blank and equipment blank samples were collected to ensure cross contamination did not occur due to contaminated equipment. Field replicate samples were collected to document analytical variability. 

Quality-control samples included 28 field blanks and 184 field 

replicates. The blanks were free of glyphosate, AMPA, and 

glufosinate. Of the 184 field replicates, 135 samples contained analytes, whereas 49 samples were nondetections. All 

replicates matched the regular sample within 20 percent. The 

analytical results from these samples are listed along with the 

results from the regular samples in tables 3 through 6 at the 

end of this report. 

Internal Standards

Internal standards were added to correct quantitative 

results for slight differences in extract volume as well as to 

compensate for differences in the injected sample volume. 

Internal standards also were used to monitor instrument conditions, such as extract injection errors, retention time shifts, or 

instrument abnormalities or malfunctions.

Laboratory Blank

The laboratory blank was reagent water prepared to monitor the entire sample preparation and analytical procedure for 

 Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
possible laboratory contamination. The blank was considered 

acceptable when a compound was undetected or detected at 

less than the minimum reporting level (MRL; Timme, 1995). 

On the basis of data analysis, there were no interferences in 

the laboratory blanks.

Laboratory Spike

The percentage recovery from the laboratory reagent 

spike was calculated from the spiking procedure described. 

The recovery was used to monitor the method performance 

for the sample preparation without considering the effects of 

sample matrix. The laboratory spike results were compiled for 

long-term recovery performance used for creating control limits and charts. If the recovery of a compound was not within 

control limits, the source of the problem was identified and 

corrected before continuing the procedure.

Instrumental Analysis Quality Control

A sample analytical sequence used for this method is 

listed in table 1. Sample extracts were analyzed in an instrument sequence to provide additional information to facilitate 

corrective actions that might be required if performance criteria were not met. 

Concentrations of Glyphosate, 

Aminomethylphosphonic Acid, and 

Glufosinate 

A summary of ground-water, surface-water, rainfall, 

and soil samples collected for State cooperative studies, the 

National Stream Quality Accounting Network Program, the 

National Water-Quality Assessment Program, and the Toxic 

Substances Hydrology Program, and analyzed by OGRL for 

glyphosate, AMPA, and glufosinate is presented in table 2.

Analytical results for glyphosate, AMPA, and glufosinate in 2,135 ground- and surface-water samples, 14 rainfall 

samples, and 193 soil samples collected from various study 

areas throughout the United States are provided in tables 3 

through 6 at the end of this report. Laboratory duplicates also 

are shown in tables 3 through 6 but not included in the sample 

count in table 2.

State Cooperative Studies

During the State cooperative studies, 271 ground- and 

281 surface-water samples were analyzed (table 3 at end of 

report) from 10 States ranging from Washington to Vermont 

and south to Mississippi. In the ground-water samples analyzed, there was no glyphosate detection and only one AMPA 

detection of 0.33 μg/L in water from a well in Kansas. There 

also were no samples from the State cooperative studies with 

a reportable glufosinate concentration. The lack of groundwater detections may have been the result of a higher reporting level (0.1 μg/L) prior to 2004 compared to a reporting 

level (0.02 μg/L) that was later achieved with the LC/MS/MS 

system. Glyphosate was detected in about 50 percent of the 

surface-water samples. A maximum glyphosate concentration 

of 99 μg/L was found in a sample collected in April 2002 from 

a site in Mississippi surrounded by cotton fields being treated 

with glyphosate to prepare for planting. 

National Stream Quality Accounting Network 

(NASQAN) Program 

Twenty-seven samples (table 4 at end of report) were 

collected from four NASQAN river sites in the Mississippi 

River Basin during 2002 (fig. 2). Overall, AMPA was detected 

at greater frequencies than glyphosate in these surface-water 

samples. There were two glyphosate detections with concentrations of 0.33 and 0.14 μg/L, and 17 AMPA detections with a 

maximum concentration of 0.38 μg/L (tables 2 and 4). 

National Water-Quality Assessment (NAWQA) 

Program 

A total of 1,093 water samples were collected from 

23 study units for the NAWQA Program during 2001–06 

(fig. 3 and table 5 at end of report). In 485 ground-water 

samples, maximum concentrations were 0.67 μg/L for glyphosate (28 detections) and 0.62 μg/L for AMPA (47 detections). 

In 608 surface-water samples, maximum concentrations were 

9.7 μg/L for glyphosate (196 detections) and 8.7 μg/L for 

AMPA (313 detections). There were two detections (0.11 and 

0.56 μg/L) of glufosinate in surface water from the Mississippi Embayment and White River Basin NAWQA study 

units. These results concur with results from previous studies that found the glyphosate degradation product, AMPA, 

occurs more frequently or at similar or higher concentrations 

than glyphosate, whereas glufosinate was seldom found in the 

environment (Scribner and others, 2003; Battaglin and others, 2005). 

Toxic Substances Hydrology (Toxics) Program

The USGS Toxic Substances Hydrology Program funded 

several studies focused on the fate and transport of glyphosate 

and AMPA in ground and surface water including overland 

flow, tile-drain flow, rainfall, and soil since 2001 (table 6 at 

end of report). Overall, these studies show that glyphosate and 

AMPA were detected more frequently in surface water than 

in ground water, and AMPA was detected at greater frequencies than glyphosate in surface water. The data also indicate 

that levels of glyphosate and AMPA may persist in the soil 

from year to year (Baker and others, 2006). Table 2 shows 

Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate 
Table 1. Example of analytical sequence for use in determining glyphosate, aminomethylphosphonic acid, and 

glufosinate in water samples.

[Study code, code used by study to identify samples; LCGY 102, glyphosate method acronym and run number; COB, carryover blank sample; ppb, parts per billion; L, laboratory duplicate; A, B, C, letters assigned to first, second, third sample 

bottles, respectively, at login; --, not applicable]

LCGY run sheet 

LCGY 102

Date: 08/24/05

Method Login iniitials

Vial number Study code Derivatized

1,2 -- COB A & 1.0 ppb 08/25/05 EG

3,4 LIG 05254 A 08/25/05 EG

5,6 PUB 05255 A 08/25/05 EG

7,8 RCM 05263 A 08/25/05 EG

9,10 LIG 05264 A 08/25/05 EG

11,12 LIG 05265 A 08/25/05 EG

13,14 LIG 05266 A 08/25/05 EG

15,16 LIG 05275 A 09/01/05 EG

17,18 LIG 05276 A 09/01/05 EG

19,20 LIG 05277 A 09/01/05 EG

21,22 PUG 05312 A 09/01/05 EG

23,24 LIG 05254 L 08/25/05 EG

25,26 -- COB B & 2.0 ppb 08/25/05 EG

27,28 PUG 05313 A 09/01/05 EG

29,30 LIG 05318 A 09/01/05 EG

31,32 LIG 05319 A 09/01/05 EG

33,34 LIG 05324 A 09/07/05 EG

35,36 LIG 05325 A 09/07/05 EG

37,38 LIG 05326 A 09/07/05 EG

39,40 USG 05335 A 09/07/05 EG

41,42 LIG 05349 A 09/07/05 EG

43,44 RCM 05350 A 09/07/05 EG

45,46 PUB 05351 A 09/07/05 EG

47,48 SKF 05353 A 09/13/05 EG

49,50 SKF 05354 A 09/13/05 EG

51,52 SKF 05355 A 09/13/05 EG

53,54 SKF 05356 A 09/13/05 EG

55,56 SKF 05357 A 09/13/05 EG

57,58 ILG 05367 A 09/13/05 EG

59,60 PUB 05313 L 09/01/05 EG

61,62 -- COB C & 1.0 ppb 09/01/05 EG

10 Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 2. Summary of glyphosate, aminomethylphosphonic acid, and glufosinate concentrations analyzed by the U.S. Geological Survey Organic Geochemistry Research Laboratory, Lawrence, Kansas, for ground-water, surface-water, rainfall, and soil samples collected for State cooperative, 

National Stream Quality Accounting Program, National Water-Quality Assessment Program, and Toxic Substances Hydrology Program studies, 

2001–06.

[--, no data; <, less than; μg/kg, microgram per kilogram; μg/L, microgram per liter]

U.S. Geological Survey studies

Number of 

samples

 Glyphosate Aminomethylphosphonic 

acid Glufosinate

Number of 

detections

Maximum 

concentration

Minimum 

concentration

Number of 

detections

Maximum 

concentration

Minimum 

concentration

Number of 

detections

Maximum 

concentration

Minimum 

concentration

Ground water (μg/L)

State cooperative studies 271 0 <0.10 <0.10 1 0.33 <0.10 0 <0.10 <0.10

National Stream Quality Accounting 

 Network Program (NASQAN)

-- -- -- -- -- -- -- -- -- --

National Water-Quality Assessment 

 Program (NAWQA)

485 28 .67 .02 47 .62 .02 0 <.10 <.10

Toxic Substances Hydrology 

 Program (Toxics)

Reconnaissance Data -- -- -- -- -- -- -- -- -- --

Lower Mississippi River Basin -- -- -- -- -- -- -- -- -- --

Sensitive Environments -- -- -- -- -- -- -- -- -- --

Leary Weber Ditch Basin 117 40 4.7 .02 85 2.6 .03 0 <.02 <.02

Surface water (μg/L)

State cooperative studies 281 143 99 .02 165 22 .04 0 <.02 <.02

National Stream Quality Accounting 

 Network Program (NASQAN)

27 2 .33 .14 17 .38 .12 0 <.10 <.10

National Water-Quality Assessment 

 Program (NAWQA)

608 196 9.7 .03 313 8.7 .03 2 .56 .11

Toxic Substances Hydrology 

 Program (Toxics)

Reconnaissance Data 171 63 8.7 .11 117 3.6 .10 2 .26 .14

Lower Mississippi River Basin 35 0 <.10 <.10 31 .38 .10 0 <.10 <.10

Sensitive Environments 76 31 328 .02 30 41 .02 1 .05 <.02

Leary Weber Ditch Basin 64 54 427 .03 52 29 .06 2 1.5 .24

Rainfall (μg/L)

Toxic Substances Hydrology 

 Program (Toxics)

Leary Weber Ditch Basin 14 12 1.1 .03 12 .47 .02 0 <.02 <.02

Soil (μg/kg)

Toxic Substances Hydrology 

 Program (Toxics)

Leary Weber Ditch Basin 193 119 476 1.0 154 956 1.0 1 1.0 <1.0

Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate 11
the number of ground- and surface-water, rainfall, and soil 

samples collected, number of detections, and the minimum 

and maximum concentrations.

Reconnaissance Data From 51 Streams in Nine 

Midwestern States

During 2002, 171 samples were collected from 

51 streams in nine Midwestern States during three periods of 

runoff (table 6 at end of report). Glyphosate was detected in 

63 samples with a maximum concentration of 8.7 μg/L, AMPA 

was detected in 117 samples with a maximum concentration of 

3.6 μg/L, and glufosinate was detected in two samples at concentrations of 0.26 and 0.14 μg/L (table 2; Scribner and others, 

2003; Battaglin and others, 2005). 

Lower Mississippi River Basin

Results from systematic water-quality sampling from 

sites in the lower Mississippi River were used to investigate 

the occurrence, fate, and transport of selected pesticides and 

their degradation products (U.S. Geological Survey, 2006a). 

Water samples were collected from the lower Mississippi 

River at Baton Rouge, Louisiana (site 07374000) (fig. 5) during April 1991 through December 2003 to help determine the 

occurrence and transport of selected herbicides, their degradation products, and nutrients in the lower Mississippi River 

Basin and the delivery to the Gulf of Mexico (Scribner and 

others, 2006). 

During 2001–03, water samples were collected twice 

monthly to study the occurrence of glyphosate, AMPA, and 

glufosinate. There were no detections of either glyphosate or 

glufosinate in the 35 samples; however, there were 31 detections of AMPA, with a maximum concentration of 0.38 μg/L 

(tables 2 and 6). 

Sensitive Environments Study

Vernal pools are sensitive environments of natural water 

that provide critical habitats for many species, including 

amphibians. These small water bodies are not always protected 

by pesticide label requirements for no-spray buffer zones, and 

the occurrence of pesticides detected is poorly documented. 

In the Sensitive Environments study (W.A. Battaglin, USGS 

written commun., June 19, 2007), glyphosate was detected in 

31 of 76 samples with a maximum concentration of 328 μg/L, 

whereas AMPA was detected in 30 samples with a maximum 

concentration of 41 μg/L. Glufosinate was detected in one 

sample at 0.05 μg/L (table 2). 

Leary Weber Ditch Basin, Indiana

A joint collaboration between Toxics and NAWQA was 

formed to study the agricultural chemicals source, transport, 

and fate within the Leary Weber Ditch Basin, a part of the 

White River Basin, a NAWQA study unit in Indiana (figs. 4 

and 5). In 2004–05, samples were collected from various 

hydrologic compartments in the Leary Weber Ditch Basin and 

analyzed for glyphosate, AMPA, and glufosinate.

Agricultural chemicals were found in Leary Weber Ditch 

and every other hydrologic compartment sampled during 

2004–05 (Baker and others, 2006). Of the 117 ground-water 

samples analyzed, glyphosate was detected in 40 samples with 

a maximum of 4.7 μg/L, and AMPA was detected in 85 samples with a maximum of 2.6 μg/L (tables 2 and 6). There were 

no glufosinate detections. Glyphosate was detected in 54 of 

the 64 surface-water samples with a maximum concentration 

of 427 μg/L, and AMPA was detected in 52 of the 64 samples 

with a maximum concentration of 29 μg/L at Mohawk, Indiana 

(table 6). In the Leary Weber Ditch, 51 of 64 water samples 

analyzed contained both glyphosate and AMPA. Higher 

concentrations in the Leary Weber Ditch occurred soon after 

application to fields and coincided with rainfall. Glufosinate 

was found in two surface-water samples from the Leary Weber 

Ditch at concentrations of 1.5 and 0.24 μg/L (tables 2 and 6). 

Both glyphosate and AMPA were detected in 12 of the 

14 rainfall samples collected. Concentrations ranged from 0.02 

to 1.1 μg/L. Glufosinate was not detected in any of the rainfall 

samples.

To examine the potential transport of glyphosate and 

AMPA through the unsaturated zone, soil cores were collected 

from April through October 2004 from both the north and 

south field sites in the Leary Weber Ditch Basin. Agricultural 

practices were the same for both fields. The maximum concentration for glyphosate was 476 μg/kg, whereas the maximum 

concentration for AMPA was 956 μg/kg (table 2). The data 

show that the maximum concentration of AMPA during preapplication (April) was 23 μg/kg. These data results may indicate 

that trace levels of glyphosate can persist in the soil from year 

to year (Baker and others, 2006). One north field soil sample 

(6–12 in. depth) contained glufosinate at a concentration of 

1.0 μg/kg (table 6). 

Summary

The Organic Geochemistry Research Laboratory 

(OGRL) was established by the USGS in Lawrence, Kansas, 

to identify contaminants that may have deleterious effects on 

water quality or be useful indicators of geochemical transport 

processes and to conduct research on the fate and transport of 

contaminants in the hydrogeologic system. Essential analytical methods have been developed using state-of-the-art liquid 

chromatography and mass spectrometry to accomplish this. 

This report presents results of analyses by OGRL for 

glyphosate, its degradation product, aminomethylphosphonic 

acid (AMPA), and glufosinate in 2,135 ground- and surfacewater samples, 14 rainfall samples, and 193 soil samples collected from 2001 through 2006. The data are used to document 

12 Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
the occurrence, distribution, and concentrations of glyphosate, 

its degradation product, aminophosphonic acid (AMPA), and 

glufosinate at locations across the United States. The data 

were collected as part of various ongoing USGS studies, such 

as those done for Federal and State cooperative agencies, the 

National Stream Quality Accounting Network (NASQAN) 

Program, the National Water-Quality Assessment (NAWQA) 

Program, and the Toxic Substances Hydrology (Toxics) Program. 

Glyphosate is among the most commonly used herbicides in the world. Its use has substantially increased in the 

United States with the introduction of genetically modified 

glyphosate-resistant corn and soybeans; however, it also is 

used extensively in yards, gardens, parks, and other nonagricultural areas. Studies show glyphosate is degraded primarily 

by microbial processes producing aminomethylphosphonic 

acid (AMPA). Samples also were analyzed for glufosinate, a 

broad-spectrum contact herbicide, used to control a wide range 

of weeds after the crop emerges or for total vegetation control 

on land not used for cultivation. 

Results show that AMPA was detected more frequently 

and occurred at similar or higher concentrations than the parent compound, glyphosate, whereas glufosinate was seldom 

found in the environment. Further study also shows that 

glyphosate and AMPA were detected more frequently in surface water than in ground water. Both glyphosate and AMPA 

were detected in rainfall samples in Indiana. The data also 

indicate that trace levels of glyphosate and AMPA may persist 

in the soil from year to year. These data were valuable for 

acquiring information about the occurrence, fate, and transport 

of these compounds and to show the importance of analyzing 

not only glyphosate but also AMPA in water-quality studies. 

Analytical results show that the methods developed at 

OGRL were valuable for acquiring information about the fate 

and transport of glyphosate, AMPA, and glufosinate in ground 

and surface water, rainfall, and soil. The data also indicate 

the importance of including both parent compounds and their 

degradation products in herbicide studies.

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Scribner, E.A., Battaglin, W.A., Goolsby, D.A., and Thurman, 

E.M., 2000, Changes in herbicide concentrations in Midwestern streams in relation to changes in use, 1989–1998: 

The Science of the Total Environment, v. 248, p. 255–263.

Scribner, E.A., Goolsby, D.A., Battaglin, W.A., Meyer, M.T., 

and Thurman, E.M., 2006, Concentrations of selected 

herbicides, herbicide degradation products, and nutrients in 

the lower Mississippi River, Louisiana, April 1991 through 

December 2003: U.S. Geological Survey Data Series 165, 

84 p.

Scribner, E.A., Thurman, E.M., Goolsby, D.A., Meyer, M.T., 

Battaglin, W.A., and Kolpin, D.W., 2005, Summary of 

significant results from studies of triazine herbicides and 

their degradation products in surface water, ground water, 

and precipitation in the Midwestern United States during 

the 1990s: U.S. Geological Survey Scientific Investigations 

Report 2005–5094, 27 p.

Sprankle, P., Meggitt, W.F., and Penner, D, 1975, Adsorption, 

mobility, and microbial degradation of glyposate in the soil: 

Weed Science, v. 23, no. 3, p. 229–234.

Timme, P.J., 1995, National Water Quality Laboratory 

1995 services catalog: U.S. Geological Survey Open-File 

Report 95–352, 92 p.

U.S. Department of Agriculture, 2006, National Agricultural 

Statistics Service (NASS) agricultural chemical use database: Information available on the Web, accessed February 6, 2006, at http://www.pestmanagement.info/nass/ 

U.S. Geological Survey, 2003, National Water-Quality Assessment Program (NAWQA): Information available on the 

Web, accessed November 4, 2003, at http://water.usgs.

gov/nawqa/

U.S. Geological Survey, 2006a, National Stream Quality 

Accounting Network (NASQAN): Information available 

on the Web, accessed April 9, 2007, at http://water.usgs.

gov/nasqan/

U.S. Geological Survey, 2006b, National field manual for the 

collection of water-quality data: U.S. Geological Survey 

Techniques of Water-Resources Investigations, book 9, 

chap. A1–A9, [various pagination], available on the Web, 

accessed February 21, 2007, at http://pubs.water.usgs.

gov/twri9A

Williams, G.M., Kroes, Robert, and Munro, I.C., 2000, Safety 

evaluation and risk assessment of the herbicide Roundup 

and its active ingredient, glyphosate, for humans: Regulatory Toxicology Pharmacology, v. 31, no. 2, p. 117–165.

14  Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Data Tables
Table 3. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in State cooperative surface- and ground-water studies, 

2001–06.

[Sample type: FB, field blank; FR, field replicate; LD, laboratory duplicate; R, regular; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/

day/year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Florida Surface-Water Study (SKF)

02266923 Swim Lake near Alcoma R 03/23/04 1050 <0.02 <0.02 <0.02

R 06/08/04 1130 <.02 .06 <.02

02270655 Lake Lynn near DeSoto City R 03/22/04 1050 <.02 <.02 <.02

LD 03/22/04 1050 <.02 <.02 <.02

R 06/07/04 1010 <.02 .14 <.02

02270700 Lake Annie near Lake Placid R 03/23/05 1150 <.02 <.02 <.02

R 06/22/05 1300 <.02 <.02 <.02

R 09/06/05 1400 <.02 <.02 <.02

273323081290800 Lake Denton near Avon Park R 03/22/04 1440 <.02 <.02 <.02

R 06/07/04 1350 <.02 .06 <.02

273850081310800 Pabor Lake near Avon Park R 03/23/05 0815 <.02 <.02 <.02

R 06/22/05 0850 <.02 <.02 <.02

R 09/07/05 1300 <.02 <.02 <.02

274648081315100 Lake Moody near Frostproof R 03/22/05 1215 <.02 <.02 <.02

R 03/22/05 1310 <.02 <.02 <.02

R 06/21/05 1300 <.02 <.02 <.02

FR 06/21/05 1400 <.02 <.02 <.02

R 09/06/05 0930 <.02 <.02 <.02

R 09/07/05 1215 <.02 <.02 <.02

274744081304200 Lake Leonore near Frostproof R 03/22/05 0930 <.02 <.02 <.02

LD 03/22/05 0930 <.02 <.02 <.02

R 06/21/05 0900 <.02 <.02 <.02

LD 06/21/05 0900 <.02 <.02 <.02

R 09/07/05 0850 <.02 <.02 <.02

275256081275900 Lake Aurora at Hesperides R 03/23/04 0805 <.02 <.02 <.02

16 Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 3. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in State cooperative surface- and ground-water studies, 

2001–06.—Continued

[Sample type: FB, field blank; FR, field replicate; LD, laboratory duplicate; R, regular; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/

day/year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Florida Surface-Water Study (SKF)—Continued

275256081275900 Lake Aurora at Hesperides R 06/08/04 0815 0.02 0.08 <0.02

Georgia Ground-Water Study (BGG)

311015084511901 07H021 R 11/14/01 1500 <.10 <.10 <.10

R 06/19/02 1300 <.10 <.10 <.10

310552084455601 08G008 R 11/15/01 1100 <.10 <.10 <.10

R 06/19/02 1100 <.10 <.10 <.10

312119084215601 11J021 R 11/15/01 1400 <.10 <.10 <.10

LD 11/15/01 1400 <.10 <.10 <.10

R 06/19/02 1600 <.10 <.10 <.10

312908084151901 11K045 R 11/16/01 1000 <.10 <.10 <.10

LD 11/16/01 1000 <.10 <.10 <.10

R 06/19/02 1800 <.10 <.10 <.10

320001084032801 13Q051 R 11/16/01 1300 <.10 <.10 <.10

R 06/18/02 1500 <.10 <.10 <.10

FR 06/18/02 1500 <.10 <.10 <.10

LD 06/18/02 1502 <.10 <.10 <.10

Illinois Ground-Water Study (EPI)

421506088550001 Illinois-BCCDGIS R 09/10/01 1708 <.10 <.10 <.10

403143088054701 Illinois-47583 R 10/09/01 1145 <.10 <.10 <.10

LD 10/09/01 1145 <.10 <.10 <.10

403143088054701 Illinois-00823 R 10/10/01 1330 <.10 <.10 <.10

412603087452601 Illinois-20458 R 10/10/01 1440 <.10 <.10 <.10

403432089380901 Illinois-50060 R 10/15/01 1047 <.10 <.10 <.10

LD 10/15/01 1047 <.10 <.10 <.10

383932090012601 Illinois-60053 R 10/16/01 1126 <.10 <.10 <.10

415551088575201 Illinois-11782 R 10/23/01 1000 <.10 <.10 <.10

LD 10/23/01 1000 <.10 <.10 <.10

404418089011802 Illinois-31409 R 10/23/01 1240 <.10 <.10 <.10

Data Tables 17
Table 3. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in State cooperative surface- and ground-water studies, 

2001–06.—Continued

[Sample type: FB, field blank; FR, field replicate; LD, laboratory duplicate; R, regular; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/

day/year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Illinois Ground-Water Study (EPI)—Continued

404418089011802 Illinois-31409 R 10/23/01 1645 <0.10 <0.10 <0.10

403404089390701 Illinois-50057 R 10/30/01 1007 <.10 <.10 <.10

421433088002701 Illinois-20250 R 10/31/01 1115 <.10 <.10 <.10

403116089251401 Illinois-50055 R 10/30/01 1235 <.10 <.10 <.10

R 10/30/01 1310 <.10 <.10 <.10

413654088475601 Illinois-11470 R 11/07/01 1035 <.10 <.10 <.10

414319089203501 Illinois-01079 R 11/07/01 1250 <.10 <.10 <.10

421256088593801 Illinois-11678 R 11/07/01 1445 <.10 <.10 <.10

401754090032001 Illinois-50308 R 11/13/01 1035 <.10 <.10 <.10

LD 11/13/01 1035 <.10 <.10 <.10

422225088102501 Illinois-02305 R 11/20/01 955 <.10 <.10 <.10

421840088033001 Illinois-00366 R 11/20/01 1100 <.10 <.10 <.10

412608088121401 Illinois-20357 R 11/21/01 1320 <.10 <.10 <.10

404625087335301 Illinois-47561 R 11/27/01 1110 <.10 <.10 <.10

411928089073001 Illinois-11509 R 12/04/01 1030 <.10 <.10 <.10

FR 12/04/01 1031 <.10 <.10 <.10

400112090312301 Illinois-01118 R 12/04/01 1115 <.10 <.10 <.10

410002088313401 Illinois- 47518 R 12/04/01 1320 <.10 <.10 <.10

LD 12/04/01 1320 <.10 <.10 <.10

FR 12/04/01 1321 <.10 <.10 <.10

421222088152701 Illinois-20141 R 12/09/01 0955 <.10 <.10 <.10

422219088222601 Illinois-00595 R 12/09/01 1120 <.10 <.10 <.10

-- Illinois-11891 R 12/11/01 1110 <.10 <.10 <.10

-- Illinois-20330 R 12/11/01 1230 <.10 <.10 <.10

403737089365401 Illinois-50376 R 12/12/01 1055 <.10 <.10 <.10

-- Illinois-50251 R 12/12/01 1315 <.10 <.10 <.10

FR 12/12/01 1317 <.10 <.10 <.10

404417090360801 Illinois-50094 R 12/18/01 1155 <.10 <.10 <.10

FR 12/18/01 1157 <.10 <.10 <.10

18  Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 3. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in State cooperative surface- and ground-water studies, 

2001–06.—Continued

[Sample type: FB, field blank; FR, field replicate; LD, laboratory duplicate; R, regular; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/

day/year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Illinois Ground-Water Study (EPI)—Continued

385946088020701 Illinois-47819 R 12/19/01 1130 <0.10 <0.10 <0.10

394602090360801 Illinois-52121 R 01/09/02 1045 <.10 <.10 <.10

394605089155301 Illinois-50224 R 01/09/02 1425 <.10 <.10 <.10

421803087554801 Illinois-20285 R 01/14/02 1055 <.10 <.10 <.10

LD 01/14/02 1055 <.10 <.10 <.10

404532088111201 Illinois-47532 R 01/15/02 0950 <.10 <.10 <.10

FR 01/15/02 0952 <.10 <.10 <.10

404614087512502 Illinois-47551 R 01/15/02 1150 <.10 <.10 <.10

372000088431001 Illinois-00757 R 01/22/02 1340 <.10 <.10 <.10

415410088034301 Illinois-20700 R 01/23/02 1020 <.10 <.10 <.10

410134089244503 Illinois-31307 R 01/29/02 1110 <.10 <.10 <.10

405404089022301 Illinois-31428 R 01/29/02 1310 <.10 <.10 <.10

421611089031101 Illinois-11636 R 02/04/02 1050 <.10 <.10 <.10

415035089175901 Illinois-11562 R 02/04/02 1400 <.10 <.10 <.10

415552088465601 Illinois-11406 R 02/05/02 0830 <.10 <.10 <.10

413805088405102 Illinois-11438 R 02/05/02 1000 <.10 <.10 <.10

-- Illinois-20497 R 02/11/02 1317 <.10 <.10 <.10

395411087485701 Illinois-47692 R 02/19/02 1330 <.10 <.10 <.10

381238090160001 Illinois-60127 R 02/25/02 1205 <.10 <.10 <.10

390644087391802 Illinois-47811 R 03/04/02 1035 <.10 <.10 <.10

LD 03/04/02 1035 <.10 <.10 <.10

FR 03/04/02 1300 <.10 <.10 <.10

391251087393801 Illinois-00251 R 03/04/02 1200 <.10 <.10 <.10

412534089550901 Illinois-11347 R 03/05/02 1110 <.10 <.10 <.10

FR 03/05/02 1111 <.10 <.10 <.10

412534089215601 Illinois-11327 R 03/05/02 1230 <.10 <.10 <.10

R 03/05/02 1530 <.10 <.10 <.10

414305089550901 Illinois-11904 R 03/06/02 1130 <.10 <.10 <.10

420559088322101 Illinois-00795 R 03/11/02 0930 <.10 <.10 <.10

395640088515501 Illinois-47725 R 03/12/02 0955 <.10 <.10 <.10

Data Tables 19
Table 3. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in State cooperative surface- and ground-water studies, 

2001–06.—Continued

[Sample type: FB, field blank; FR, field replicate; LD, laboratory duplicate; R, regular; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/

day/year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Illinois Ground-Water Study (EPI)—Continued

-- Illinois-01416 R 03/12/02 1315 <0.10 <0.10 <0.10

392418087392101 Illinois-45155 R 03/18/02 1055 <.10 <.10 <.10

FR 03/18/02 1056 <.10 <.10 <.10

FR 03/18/02 1100 <.10 <.10 <.10

-- Illinois-11892 R 03/19/02 1110 <.10 <.10 <.10

412421090334501 Illinois-31889 R 03/19/02 1350 <.10 <.10 <.10

400022090522301 Illinois-50227 R 04/01/02 1115 <.10 <.10 <.10

394212090344901 Illinois-50101 R 04/01/02 1410 <.10 <.10 <.10

FR 04/01/02 1411 <.10 <.10 <.10

-- Illinois-20207 R 04/02/02 0935 <.10 <.10 <.10

401217088220301 Illinois-47687 R 04/08/02 1055 <.10 <.10 <.10

400836088185101 Illinois-45081 R 04/08/02 1410 <.10 <.10 <.10

413328089274501 Illinois-11363 R 04/09/02 1030 <.10 <.10 <.10

FR 04/09/02 1032 <.10 <.10 <.10

LD 04/09/02 1032 <.10 <.10 <.10

383124088135401 Illinois-71531 R 04/16/02 1200 <.10 <.10 <.10

391411090072001 Illinois-50395 R 04/22/02 1120 <.10 <.10 <.10

FR 04/22/02 1125 <.10 <.10 <.10

LD 04/22/02 1125 <.10 <.10 <.10

420947087561801 Illinois-20297 R 04/23/02 1035 <.10 <.10 <.10

413337088055501 Illinois-20447 R 04/23/02 1350 <.10 <.10 <.10

403758089370801 Illinois-50383 R 04/29/02 1030 <.10 <.10 <.10

FR 04/29/02 1035 <.10 <.10 <.10

401930090361701 Illinois-50298 R 04/29/02 1350 <.10 <.10 <.10

FR 04/29/02 1352 <.10 <.10 <.10

412232089275101 Illinois-11367 R 04/30/02 1020 <.10 <.10 <.10

411529089105701 Illinois-11600 R 04/30/02 1215 <.10 <.10 <.10

412030089001901 Illinois-11495 R 04/30/02 1325 <.10 <.10 <.10

422322088140901 Illinois-20180 R 05/14/02 1135 <.10 <.10 <.10

412143088254901 Illinois-22040 R 05/14/02 1325 <.10 <.10 <.10

20 Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 3. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in State cooperative surface- and ground-water studies, 

2001–06.—Continued

[Sample type: FB, field blank; FR, field replicate; LD, laboratory duplicate; R, regular; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/

day/year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Illinois Ground-Water Study (EPI)—Continued

412143088254901 Illinois-22040 R 05/14/02 1425 <0.10 <0.10 <0.10

421359088323201 Illinois-00276 R 05/20/02 0800 <.10 <.10 <.10

FR 05/20/02 0802 <.10 <.10 <.10

415027089175501 Illinois-11560 R 05/20/02 1030 <.10 <.10 <.10

49332088363201 Illinois-00572 R 05/21/02 1035 <.10 <.10 <.10

FR 05/21/02 1040 <.10 <.10 <.10

392439089262001 Illinois-50237 R 05/21/02 1335 <.10 <.10 <.10

394338090542001 Illinois-52062 R 06/05/02 1130 <.10 <.10 <.10

415839088113901 Illinois-20613 R 06/11/02 0950 <.10 <.10 <.10

404511090004001 Illinois-50351 R 06/11/02 1425 <.10 <.10 <.10

412854087503501 Illinois-20442 R 06/17/02 1335 <.10 <.10 <.10

403551088021302 Illinois-47573 R 06/17/02 1120 <.10 <.10 <.10

421656089031301 Illinois-11629 R 06/18/02 0905 <.10 <.10 <.10

414955089291901 Illinois-11557 R 06/18/02 1125 <.10 <.10 <.10

420727088153901 Illinois-20029 R 06/24/02 0950 <.10 <.10 <.10

4155090089032801 Illinois-11943 R 06/25/02 1005 <.10 <.10 <.10

414122088585401 Illinois-11570 R 06/25/02 1130 <.10 <.10 <.10

414945088115101 Illinois-20766 R 07/01/02 1255 <.10 <.10 <.10

395106089432801 Illinois-50003 R 07/02/02 1040 <.10 <.10 <.10

FR 07/02/02 1045 <.10 <.10 <.10

385235090072601 Illinois-60058 R 07/02/02 1055 <.10 <.10 <.10

395106089432801 Illinois-50003 R 07/02/02 1040 <.10 <.10 <.10

404126089305001 Illinois-50051 R 07/17/02 1325 <.10 <.10 <.10

420608089501401 Illinois-11707 R 07/29/02 1030 <.10 <.10 <.10

LD 07/29/02 1030 <.10 <.10 <.10

410931088384401 Illinois-11514 R 07/30/02 1300 <.10 <.10 <.10

Iowa Surface-Water Study (DJS)

05418500 Maquoketa River near Maquoketa R 06/05/02 1200 <.10 .18 <.10

LD 06/05/02 1200 <.10 .17 <.10

05420500 Mississippi River at Clinton R 05/23/03 1040 <.10 <.10 <.10

05422000 Wapsipinicon River near DeWitt R 06/05/02 1430 <.10 .22 <.10

Data Tables 21
Table 3. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in State cooperative surface- and ground-water studies, 

2001–06.—Continued

[Sample type: FB, field blank; FR, field replicate; LD, laboratory duplicate; R, regular; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/

day/year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Iowa Surface-Water Study (DJS)—Continued

05457470 Cedar River at St. Ansgar R 09/23/02 1058 0.47 0.81 <0.10

05458500 Cedar River at Janesville R 09/24/02 0752 <.10 .41 <.10

05458900 West Fork Cedar River at Finchford R 09/24/02 0950 <.10 .26 <.10

05462000 Shell Rock River at Shell Rock R 09/23/02 1705 <.10 .44 <.10

05464090 Cedar River near LaPorte City R 09/25/02 0905 <.10 .27 <.10

05464220 Wolf Creek near Dysart R 09/24/02 1410 <.10 .21 <.10

05464420 Cedar River at Blairs Ferry Road at Palo R 09/23/02 1415 <.10 .28 <.10

LD 09/23/02 1415 <.10 .26 <.10

05464480 Cedar River at Edgewood Road at Cedar Rapids R 09/04/02 0915 <.10 <.10 <.10

LD 09/04/02 0915 <.10 <.10 <.10

122 -- R 06/14/03 1015 <.10 <.10 <.10

123 -- R 06/14/03 1000 <.10 <.10 <.10

124 -- R 06/14/03 0945 <.10 <.10 <.10

124 -- LD 06/14/03 0945 <.10 <.10 <.10

126 -- R 06/14/03 0920 <.10 <.10 <.10

164 -- R 06/14/03 1058 <.10 .16 <.10

164 -- LD 06/14/03 1058 <.10 .16 <.10

192 -- R 06/14/03 1025 <.10 .18 <.10

341 -- R 06/14/03 0935 <.10 .14 <.10

351 -- R 06/14/03 1045 <.10 <.10 <.10

352 -- R 06/14/03 1030 <.10 <.10 <.10

381 -- R 06/14/03 1018 <.10 <.10 <.10

382 -- R 06/14/03 0954 <.10 <.10 <.10

383 -- R 06/14/03 1045 <.10 <.10 <.10

384 -- R 06/14/03 0910 <.10 <.10 <.10

573 -- R 06/14/03 1140 <.10 <.10 <.10

574 -- R 06/14/03 1215 <.10 <.10 <.10

61 -- R 06/14/03 1325 <.10 <.10 <.10

62 -- R 06/14/03 0730 <.10 <.10 <.10

662 -- R 06/14/03 0801 3.5 .68 <.10

22 Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 3. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in State cooperative surface- and ground-water studies, 

2001–06.—Continued

[Sample type: FB, field blank; FR, field replicate; LD, laboratory duplicate; R, regular; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/

day/year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Iowa Surface-Water Study (DJS)—Continued

701 -- R 06/14/03 0857 <0.10 <0.10 <0.10

702 -- R 06/14/03 0812 <.10 .19 <.10

704 -- R 06/14/03 0933 <.10 .13 <.10

71 -- R 06/14/03 0930 <.10 .10 <.10

73 -- R 06/14/03 0800 <.10 <.10 <.10

74 -- R 06/14/03 1000 <.10 .13 <.10

77 -- R 06/14/03 1000 <.10 <.10 <.10

861 -- R 06/14/03 1215 <.10 <.10 <.10

862 -- R 06/14/03 1115 <.10 <.10 <.10

865 -- R 06/14/03 1200 <.10 <.10 <.10

93 -- R 06/14/03 0820 <.10 .15 <.10

 Iowa Ground-Water Study (DJS) 

415949091405401 CRM–1 R 09/05/02 1330 <.10 <.10 <.10

415953091435301 CRM–4 R 09/05/02 0930 <.10 <.10 <.10

420009091432101 CRM–27 R 09/03/02 1400 <.10 <.10 <.10

R 09/04/02 1715 <.10 <.10 <.10

420012091432601 CRM–25 R 09/03/02 1200 <.10 <.10 <.10

420013091431001 CRM–22 R 09/04/02 1045 <.10 <.10 <.10

420015091431301 CRM–23 R 09/04/02 1315 <.10 <.10 <.10

420018091430801 CRM–26 R 09/04/02 1530 <.10 <.10 <.10

FR 09/04/02 1535 <.10 <.10 <.10

420033091420301 CRM–2 R 09/05/02 1130 <.10 <.10 <.10

420002091403200 Water treatment plant R 09/05/02 1515 <.10 <.10 <.10

420010091431801 Seminole Ranney R 05/29/03 1315 <.10 <.10 <.10

420035091422301 Edgewood Ranney R 05/29/03 1400 <.10 <.10 <.10

 Iowa Ground-Water Study (DKW) 

-- Fairfield 94–1 R 09/06/01 1000 <.10 <.10 <.10

403659094285301 Blockton #1 R 08/14/01 0915 <.10 <.10 <.10

LD 08/14/01 0915 <.10 <.10 <.10

403745091174701 Fort Madison 4 R 09/06/01 1300 <.10 <.10 <.10

LD 09/06/01 1300 <.10 <.10 <.10

Data Tables 23
Table 3. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in State cooperative surface- and ground-water studies, 

2001–06.—Continued

[Sample type: FB, field blank; FR, field replicate; LD, laboratory duplicate; R, regular; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/

day/year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

 Iowa Ground-Water Study (DKW)—Continued

403906095015001 Shambaugh #3 R 08/14/01 0715 <0.10 <0.10 <0.10

FR 08/14/01 0720 <.10 <.10 <.10

R 08/27/01 0830 <.10 <.10 <.10

FR 08/27/01 0838 <.10 <.10 <.10

LD 08/27/01 0838 <.10 <.10 <.10

R 08/29/01 1400 <.10 <.10 <.10

LD 08/29/01 1400 <.10 <.10 <.10

404327095284801 Farragut # 79–2 North R 08/13/01 1140 <.10 <.10 <.10

405632094534401 Nodaway #4 R 08/13/01 1645 <.10 <.10 <.10

405850095061701 Stanton #1 R 08/13/01 1430 <.10 <.10 <.10

405858093175701 Russell #1 R 08/15/01 1215 <.10 <.10 <.10

410907092375301 Eddyville 3 R 09/05/01 1515 <.10 <.10 <.10

411501095251301 Carson # (5), 3 R 08/13/01 0830 <.10 <.10 <.10

411622094520901 Cumberland #1 R 08/14/01 1315 <.10 <.10 <.10

411639094521101 Cumberland # (5), 4 R 08/14/01 1200 <.10 <.10 <.10

411644091110703 Grandview 3 R 08/08/01 1345 <.10 <.10 <.10

411727094374001 Fontanelle #5 R 08/14/01 1500 <.10 <.10 <.10

412013091485701 West Chester R 08/08/01 1230 <.10 <.10 <.10

412138091571501 Keota 2 R 08/08/01 0915 <.10 <.10 <.10

412850091342901 Riverside 5 R 08/02/01 1511 <.10 <.10 <.10

LD 08/02/01 1511 <.10 <.10 <.10

413040090455001 Blue Grass (2), 1 R 08/07/01 1130 <.10 <.10 <.10

FR 08/07/01 1135 <.10 <.10 <.10

413040093290501 Carlisle #5 R 07/27/01 0915 <.10 <.10 <.10

413049095254501 Shelby #5 R 08/17/01 1345 <.10 <.10 <.10

413234094552401 Brayton #1 R 08/17/01 1100 <.10 <.10 <.10

413521090511001 Stockton 1 R 08/07/01 0915 <.10 <.10 <.10

413836094161701 Linden #3 R 08/15/01 0815 <.10 <.10 <.10

413913093070001 Newton 13 R 09/05/01 1230 <.10 <.10 <.10

413923090350901 Eldridge 2 R 08/06/01 1500 <.10 <.10 <.10

24  Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 3. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in State cooperative surface- and ground-water studies, 

2001–06.—Continued

[Sample type: FB, field blank; FR, field replicate; LD, laboratory duplicate; R, regular; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/

day/year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

 Iowa Ground-Water Study (DKW)—Continued

414032091210001 West Branch 4 R 09/19/01 0930 <0.10 <0.10 <0.10

FR 09/19/01 0935 <.10 <.10 <.10

LD 09/19/01 0935 <.10 <.10 <.10

414236096012501 Mondamin #2, South R 08/27/01 1130 <.10 <.10 <.10

414400924330001 Grinnell 7 R 09/18/01 1230 <.10 <.10 <.10

414520092211201 Ladora 1 R 09/20/01 0830 <.10 <.10 <.10

FR 09/20/01 0915 <.10 <.10 <.10

LD 09/20/01 0915 <.10 <.10 <.10

414652090153201 Cammanche 2 R 08/06/01 1115 <.10 <.10 <.10

414825091511201 East Amana #2 R 08/30/01 1145 <.10 <.10 <.10

414930090321601 Dewitt 3 R 08/06/01 1315 <.10 <.10 <.10

415057094065301 Perry #9R R 07/26/01 1500 <.10 <.10 <.10

415233094403201 Coon Rapids #1 North R 08/02/01 1345 <.10 <.10 <.10

415252093411401 Slater #1 R 07/26/01 1300 <.10 <.10 <.10

415417092180101 Belle Plaine #4 R 08/29/01 0900 <.10 <.10 <.10

415753092350201 Tama 5 R 09/04/01 1115 <.10 <.10 <.10

420005091431201 Cedar Rapids Sb R 08/02/01 931 <.10 <.10 <.10

420336095115601 Vail #(1), 2 R 08/02/01 1600 <.10 <.10 <.10

420352092552401 Marshalltown 14 R 09/04/01 1330 <.10 <.10 <.10

420405092545601 Marshalltown 8 R 06/09/01 1430 <.10 <.10 <.10

420414090113201 Subula 1 R 08/06/01 0930 <.10 <.10 <.10

420451093561301 Boone #20 R 07/26/01 1030 <.10 <.10 <.10

420535091524002 Shellsburg 2 R 08/02/01 1131 <.10 <.10 <.10

420955095475601 Mapletone #5 R 08/02/01 1015 <.10 <.10 <.10

FR 08/02/01 1020 <.10 <.10 <.10

420959094001901 Pilot Mound #3 R 07/26/01 0845 <.10 <.10 <.10

421135092275002 Traer 2, South R 09/04/01 0845 <.10 <.10 <.10

421322092522001 Conrad 3 R 09/05/01 0900 <.10 <.10 <.10

421442091120001 Monticello 4 R 09/19/01 1230 <.10 <.10 <.10

FR 09/19/01 1300 <.10 <.10 <.10

Data Tables 25
Table 3. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in State cooperative surface- and ground-water studies, 

2001–06.—Continued

[Sample type: FB, field blank; FR, field replicate; LD, laboratory duplicate; R, regular; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/

day/year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

 Iowa Ground-Water Study (DKW)—Continued

422106095280201 Ida Grove #3 R 08/01/01 1345 <0.10 <0.10 <0.10

LD 08/01/01 1345 <.10 <.10 <.10

422611092552501 Wellsburg 1 R 09/18/01 0945 <.10 <.10 <.10

422819092212701 Waterloo #17 R 08/29/01 0945 <.10 <.10 <.10

422831095465102 Correctionville #1W R 08/01/01 0900 <.10 <.10 <.10

422852092040101 Jesup #2 R 08/29/01 1130 <.10 <.10 <.10

422915095323504 Holstein #3 R 08/02/01 0830 <.10 <.10 <.10

422929096254501 Sioux City River #4 R 07/31/01 0930 <.10 <.10 <.10

423028094115101 Ft. Dodge #12 R 07/25/01 1130 <.10 <.10 <.10

423135090383201 Dubuque 9 R 09/11/01 1215 <.10 <.10 <.10

423537095583901 Kingsley #1 R 07/31/01 1215 <.10 <.10 <.10

423602090595201 Holy Cross 1 R 09/11/01 1530 <.10 <.10 <.10

LD 09/11/01 1530 <.10 <.10 <.10

423744095383301 Quimby #1 R 08/01/01 1115 <.10 <.10 <.10

423954093535801 Eagle Grove #3 R 08/27/01 1030 <.10 <.10 <.10

424341095331301 Cherokee #10 R 08/01/01 1545 <.10 <.10 <.10

425330092483701 Greene 1 R 09/14/01 1215 <.10 <.10 <.10

425341093132501 Sheffield #2 R 07/25/01 0815 <.10 <.10 <.10

FR 07/25/01 0820 <.10 <.10 <.10

LD 07/25/01 0820 <.10 <.10 <.10

425528093364501 Goodell #2 R 07/24/01 1730 <.10 <.10 <.10

425717091382602 Elgin 2 R 09/12/01 0930 <.10 <.10 <.10

425731094270801 West Bend #2 R 07/23/01 1615 <.10 <.10 <.10

430015093360501 Klemme #2 R 07/24/01 1415 <.10 <.10 <.10

430015093360502 Klemme #1 R 08/27/01 1425 <.10 <.10 <.10

430017096285301 Hawarden #2 R 07/31/01 1415 <.10 <.10 <.10

431157095502901 Sheldon #5 R 07/31/01 1615 <.10 <.10 <.10

431556093375401 Forest City #2 R 07/24/01 1045 <.10 <.10 <.10

431638091282902 Waukon 2 R 09/12/01 1230 <.10 <.10 <.10

431654092484501 Osage 5 R 09/13/01 1515 <.10 <.10 <.10

26 Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 3. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in State cooperative surface- and ground-water studies, 

2001–06.—Continued

[Sample type: FB, field blank; FR, field replicate; LD, laboratory duplicate; R, regular; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/

day/year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

 Iowa Ground-Water Study (DKW)—Continued

431828091473201 Decorah 6 R 09/12/01 1530 <0.10 <0.10 <0.10

432150092332401 Riceville R 09/13/01 1215 <.10 <.10 <.10

432241092550802 St. Ansgar 2 R 09/14/01 0915 <.10 <.10 <.10

432349094285201 Armstrong #7 R 07/24/01 0815 <.10 <.10 <.10

432608096201503 Lester #(4), 2 R 07/31/01 1930 <.10 <.10 <.10

432650092170401 Lime Springs R 09/13/01 0930 <.10 <.10 <.10

Kansas Surface-Water Study (AZE)

07143672 Little Arkansas River at Hwy 50 near Halstead FB 05/14/02 0730 <.10 <.10 <.10

R 05/14/02 1005 .16 .41 <.10

R 06/06/02 1200 <.10 .26 <.10

R 06/17/02 0915 .75 .50 <.10

R 04/22/03 1010 <.10 .28 <.10

R 05/28/03 1030 .28 .36 <.10

07144100 Little Arkansas River near Sedgwick R 05/13/02 1115 .98 .54 <.10

R 06/06/02 0900 .66 .41 <.10

R 06/13/02 0930 .43 .49 <.10

R 04/23/03 0950 <.10 .27 <.10

R 05/29/03 1000 .32 .37 <.10

Kansas Ground-Water Study (AZE)

380643097353001 Alta Mills well R 05/29/02 1245 <.10 <.10 <.10

380424097343801 TH–10–95 R 05/28/02 0945 <.10 <.10 <.10

R 05/29/02 1020 <.10 <.10 <.10

380237097324401 TH–02–95 R 05/29/02 1025 <.10 <.10 <.10

375304097291301 TH–06–95 R 05/29/02 1255 <.10 <.10 <.10

375628097270801 TH–08–A3 R 05/30/02 0910 <.10 <.10 <.10

375628097271701 TH–08–A5 R 05/30/02 1110 <.10 <.10 <.10

375259097252901 Sedgwick well R 05/31/02 0925 <.10 <.10 <.10

380028097311001 EB–145–A1 R 06/03/02 0945 <.10 <.10 <.10

FR 06/03/02 1145 <.10 <.10 <.10

Data Tables 27
Table 3. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in State cooperative surface- and ground-water studies, 

2001–06.—Continued

[Sample type: FB, field blank; FR, field replicate; LD, laboratory duplicate; R, regular; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/

day/year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

 Kansas Ground-Water Study (AZE)—Continued

380143097344201 IW–06A R 06/24/02 1005 <0.10 0.33 <0.10

380143097344202 IW–06C R 06/24/02 1225 <.10 <.10 <.10

380016097384901 IW–08A R 06/25/02 0950 <.10 <.10 <.10

380016097384902 IW–08C R 06/25/02 1245 <.10 <.10 <.10

380328097342501 IW–03A R 06/26/02 0950 <.10 <.10 <.10

380328097342502 IW–03C (deep) R 06/26/02 1150 <.10 <.10 <.10

380421097385001 IW–01A R 06/27/02 0945 <.10 <.10 <.10

LD 06/27/02 0945 <.10 <.10 <.10

380421097385002 IW–01C R 06/27/02 1205 <.10 <.10 <.10

LD 06/27/02 1205 <.10 <.10 <.10

375958097300001 IW–12A R 07/08/02 0940 <.10 <.10 <.10

375958097300002 IW–12C R 07/08/02 1200 <.10 <.10 <.10

375630097342701 IW–20A R 07/10/02 0905 <.10 <.10 <.10

375630097342702 IW–20C R 07/10/02 1150 <.10 <.10 <.10

375629097293701 IW–22A R 07/11/02 0930 <.10 <.10 <.10

375629097293702 IW–22C R 07/11/02 1200 <.10 <.10 <.10

375446097390701 IW–24A R 07/16/02 0950 <.10 <.10 <.10

375446097390702 IW–24C R 07/16/02 1140 <.10 <.10 <.10

LD 07/16/02 1140 <.10 <.10 <.10

375258097340601 IW–30A R 07/18/02 0850 <.10 <.10 <.10

375258097340602 IW–30C R 07/18/02 1105 <.10 <.10 <.10

375116097274701 IW–37A R 07/25/02 0900 <.10 <.10 <.10

375116097274702 IW–37C R 07/25/02 1130 <.10 <.10 <.10

380356097340901 DW–TW–06 R 12/03/02 1305 <.10 <.10 <.10

380358097341301 DW–TW–07 R 12/03/02 1040 <.10 <.10 <.10

380142097363601 RRW–03 R 12/09/02 1050 <.10 <.10 <.10

380329097363703 RRW–01 R 12/10/02 1300 <.10 <.10 <.10

LD 12/10/02 1300 <.10 <.10 <.10

380336097335801 DW–TW–03 R 12/10/02 1015 <.10 <.10 <.10

28  Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 3. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in State cooperative surface- and ground-water studies, 

2001–06.—Continued

[Sample type: FB, field blank; FR, field replicate; LD, laboratory duplicate; R, regular; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/

day/year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

 Kansas Ground-Water Study (AZE)—Continued

380338097340201 DW–TW–04 R 12/11/02 1015 <0.10 <0.10 <0.10

380344097340401 DW–TW–05 R 12/11/02 1215 <.10 <.10 <.10

380329097334601 DW–TW–01 R 12/12/02 1030 <.10 <.10 <.10

380333097335001 DW-TW-02 R 12/12/02 1015 <.10 <.10 <.10

380235097363801 RRW–02 R 03/06/03 1225 <.10 <.10 <.10

Kansas Surface-Water Study (JUR) 

-- Bronson City Lake R 04/03/03 1300 <.10 <.10 <.10

LD 04/03/03 1300 <.10 <.10 <.10

-- Centralia Lake, Centralia R 05/02/03 1000 <.10 <.10 <.10

LD 05/02/03 1000 <.10 .10 <.10

-- Crystal Lake, Garnett R 04/10/03 1030 <.10 <.10 <.10

-- Edgerton City Lake R 11/12/02 1000 <.10 .19 <.10

-- Gardner City Lake R 10/21/02 1100 <.10 <.10 <.10

-- Hiawatha City Lake R 10/02/02 1200 <.10 .19 <.10

-- Lake Afton R 10/17/02 1230 <.10 <.10 <.10

-- Mission Lake R 10/23/02 1000 <.10 .27 <.10

-- Mission Lake R 05/21/03 1300 <.10 .31 <.10

-- Pony Creek Lake, Sabetha R 05/21/03 1000 <.10 <.10 <.10

Kansas Surface-Water Study (KSU) 

-- 9F–D Manhattan R 10/18/01 -- <.02 <.02 <.02

FR 10/18/01 -- <.02 <.02 <.02

-- 9F–G FR 10/18/01 -- <.02 <.02 <.02

-- Fairway #1 R 05/21/03 1000 3.3 6.1 <.02

-- Fairway #2 R 05/07/02 1200 5.2 22 <.02

-- Fairway #3 R 07/02/03 0845 .63 .80 <.02

R 07/23/03 0830 <.02 .64 <.02

-- Fairway Drain #1 R 05/07/02 1200 1.2 5.4 <.02

R 05/12/03 0900 .33 1.0 <.02

-- Fairway Drain #2 R 05/12/03 0900 .59 1.6 <.02

R 06/20/02 0930 .42 1.2 <.02

Data Tables 29
Table 3. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in State cooperative surface- and ground-water studies, 

2001–06.—Continued

[Sample type: FB, field blank; FR, field replicate; LD, laboratory duplicate; R, regular; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/

day/year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Kansas Surface-Water Study (KSU)—Continued

-- Fairway Drain #3 R 05/07/02 1200 0.47 1.2 <0.02

R 05/12/03 0900 1.0 2.5 <.02

-- Inlet #1 R 05/05/02 1932 <.02 <.02 <.02

R 05/10/02 2200 <.02 <.02 <.02

-- Inlet #4 R 04/23/03 1504 <.02 <.02 <.02

LD 04/23/03 1504 <.02 <.02 <.02

R 04/29/02 0306 .16 <.02 <.02

-- Outlet #5 R 05/24/03 0643 <.02 <.02 <.02

R 05/24/03 0726 <.02 .26 <.02

-- Pond #1, Site #1, 0.75 foot R 04/16/03 -- <.02 <.02 <.02

-- Pond #2, Site #1, 1.0 foot R 04/16/03 -- <.02 <.02 <.02

-- Pond 2, Sample 4, 6 foot R 08/06/03 -- <.02 <.02 <.02

-- Pond 2, Sample 5, 8 foot R 08/06/03 -- <.02 <.02 <.02

Mississippi Surface-Water Study (RRM) 

-- 1617–TL3 R 08/27/01 2114 <.10 <.10 <.10

-- 1610–BL3 R 08/31/01 0626 1.0 2.5 <.10

-- 1618–TL3 R 08/31/01 0729 <.10 <.10 <.10

-- 1622–UL1 R 08/31/01 0800 .23 .81 <.10

-- 1619–TL3 R 09/01/01 0806 <.10 <.10 <.10

-- 1614–BL4B R 08/31/01 0837 .52 1.1 <.10

-- 1609–BL4 R 08/31/01 0912 .68 2.5 <.10

-- 1611–BL3 R 09/01/01 0823 .88 2.9 <.10

-- 1623–UL1 R 09/01/01 0920 .22 .74 <.10

-- 1615–UL2 R 09/01/01 0945 .25 1.7 <.10

-- 1616–UL2 R 09/02/01 0820 .32 1.2 <.10

-- 1616–TL2 R 09/02/01 1305 .58 .68 <.10

-- 1615–BL4B R 09/02/01 1412 .31 1.4 <.10

LD 09/02/01 1412 .20 1.0 <.10

-- 2601–UL1 R 10/11/01 1437 .43 .77 <.10

30 Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 3. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in State cooperative surface- and ground-water studies, 

2001–06.—Continued

[Sample type: FB, field blank; FR, field replicate; LD, laboratory duplicate; R, regular; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/

day/year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Mississippi Surface-Water Study (RRM)—Continued

-- 2601–UL2 R 10/11/01 1537 0.23 1.0 <0.10

-- 2601–TL2 R 10/12/01 1312 .20 .33 <.10

-- 2602–UL1 R 10/13/01 0850 .40 1.1 <.10

-- 2602–UL2 R 10/13/01 0913 .22 .85 <.10

-- 2601–BL4A R 10/13/01 0945 1.3 2.4 <.10

-- 2601–BL3 R 11/26/01 1855 .88 2.0 <.10

-- 2603–UL2 R 11/27/01 0827 .49 1.6 <.10

-- 2602–TL2 R 11/27/01 0215 .25 .49 <.10

-- 2601–TL3 R 11/27/01 0255 .60 <.10 <.10

-- 2602–BL4A R 11/27/01 0258 .40 1.7 <.10

-- 2603–UL1 R 11/27/01 0300 .29 .86 <.10

-- 2604–UL2 R 11/28/01 1111 .42 .86 <.10

-- 2604–UL1 R 11/28/01 1118 .52 .76 <.10

-- 2603–TL2 R 11/28/01 1341 .43 .33 <.10

-- 2602–BL3 R 11/28/01 1402 .49 1.5 <.10

-- 2602–TL3 R 11/28/01 1812 .41 <.10 <.10

-- 2604–BL4A R 11/28/01 1815 .27 .63 <.10

-- 2605–BL4A R 12/12/01 1251 .34 .70 <.10

LD 12/12/01 1251 .29 .55 <.10

-- 2603–TL3 R 12/12/01 1314 <.10 <.10 <.10

-- 2604–TL2 R 12/12/01 1316 .43 .24 <.10

-- 2605–UL1 R 12/12/01 1319 2.0 .66 <.10

-- 2605–UL2 R 12/12/01 1353 .14 .66 <.10

-- 2606–UL2 R 12/12/01 2318 .11 .89 <.10

-- 2601–BL1 R 12/13/01 1558 .48 1.1 <.10

-- 2606–BL4A R 12/15/01 1452 .14 .36 <.10

-- 2604–TL3 R 12/17/01 0311 .13 <.10 <.10

-- 2607–UL2 R 12/17/01 0347 .17 .75 <.10

-- 2606–UL1 R 01/22/02 1845 <.10 .47 <.10

-- 2601–BL4 R 01/23/02 0138 .33 .70 <.10

Data Tables  31
Table 3. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in State cooperative surface- and ground-water studies, 

2001–06.—Continued

[Sample type: FB, field blank; FR, field replicate; LD, laboratory duplicate; R, regular; --, no data; <, less than; μg/L; micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/

day/year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Mississippi Surface-Water Study (RRM)—Continued

-- 2601–BL4B R 01/23/02 0248 0.15 0.24 <0.10

-- 2602–BL1 R 01/23/02 0249 1.1 1.4 <.10

-- 2607–BL4A R 01/23/02 2302 .18 .84 <.10

-- 2607–UL1 R 01/24/02 0541 .13 .45 <.10

-- 2605–TL3 R 01/24/02 0634 <.10 <.10 <.10

-- 2608–BL4A R 01/24/02 0650 .17 .49 <.10

-- 2603–BL1 R 01/24/02 0653 .17 .83 <.10

-- 2605–TL2 R 01/24/02 0658 .16 .18 <.10

-- 2603–BL3 R 01/24/02 0658 .37 .77 <.10

-- 2602–BL4B R 01/24/02 0706 .19 .47 <.10

LD 01/24/02 0800 .27 .44 <.10

-- 2604–BL1 R 01/31/02 1742 .25 1.2 <.10

-- 2609–BL4A R 01/31/02 1757 .11 .71 <.10

-- 2605–BL1 R 02/06/02 0117 .27 1.1 <.10

-- 2608–UL2 R 02/06/02 0132 <.10 .60 <.10

-- 2604–BL3 R 02/06/02 0203 .20 .77 <.10

-- 2606–TL3 R 02/06/02 0235 <.10 <.10 <.10

-- 2606–TL2 R 02/06/02 0241 .25 .31 <.10

-- 2603–BL4B R 02/06/02 0501 <.10 .19 <.10

-- 2610–BL4A R 02/06/02 0520 <.10 .57 <.10

-- 2606–BL1 R 02/19/02 0240 .39 1.1 <.10

-- 2611–BL4A R 02/19/02 0250 .12 .77 <.10

-- 2607–BlL3 R 02/19/02 0256 .24 .93 <.10

-- 2607–TL3 R 02/19/02 2109 <.10 <.10 <.10

-- 2604–BL4 R 02/19/02 2140 <.10 .26 <.10

-- 2603–BL4 R 02/19/02 2234 <.10 .51 <.10

LD 02/19/02 2234 <.10 .59 <.10

-- 2612–BL4A R 03/12/02 0213 .22 .98 <.10

-- 2608–TL3 R 03/12/02 0237 <.10 <.10 <.10

-- 2609–UL2 R 03/12/02 0309 .36 1.5 <.10

32 Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 3. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in State cooperative surface- and ground-water studies, 

2001–06.—Continued

[Sample type: FB, field blank; FR, field replicate; LD, laboratory duplicate; R, regular; --, no data; <, less than; μg/L; micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/

day/year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Mississippi Surface-Water Study (RRM)—Continued

-- 2605–BL4B R 03/12/02 0350 0.49 0.44 <0.10

LD 03/12/02 0350 .43 .33 <.10

-- 2604–BL4 R 03/12/02 0500 .21 .90 <.10

-- 2606–BL4B R 03/16/02 0100 2.7 1.2 <.10

-- 2613–BL4A R 03/16/02 0122 5.7 2.3 <.10

-- 2609–TL3 R 03/16/02 0128 .28 .22 <0.10

-- 2608–UL1 R 03/16/02 0147 .20 .62 <.10

-- 2609–TL2 R 03/16/02 0155 .53 .72 <.10

-- 2610–UL2 R 03/16/02 0158 .27 1.3 <.10

-- 2605–BL4 R 03/16/02 0309 9.8 2.5 <.10

-- 2607–BL1 R 03/20/02 0515 .48 2.0 <.10

LD 03/20/02 0515 .44 2.2 <.10

-- 2609–UL1 R 03/20/02 0526 .25 .76 <.10

-- 2611–UL2 R 03/20/02 0545 .36 1.4 <.10

-- 2610–TL3 R 03/20/02 1148 .43 <.10 <.10

-- 2614–BL4A R 03/20/02 1155 1.1 1.5 <.10

-- 2607–BL4B R 03/20/02 1155 .36 1.6 <.10

-- 2606–BL4 R 03/20/02 1304 1.1 1.4 <.10

-- 2608–BL1 R 03/30/02 2136 .47 1.9 <.10

-- 2611–TL3 R 03/30/02 2139 <.10 <.10 <.10

-- 2611–TL3 LD 03/30/02 2139 .10 <.10 <.10

-- 2615–BL4A R 03/30/02 2156 .51 1.1 <.10

-- 2612–UL2 R 03/30/02 2309 .11 1.2 <.10

-- 2611–TL2 R 03/30/02 2310 2.1 .67 <.10

-- 2608–BL4B R 03/31/02 0150 .38 2.2 <.10

-- 2607–BL4 R 03/31/02 0320 .59 .65 <.10

-- 2607–BL4 LD 03/31/02 0320 .49 .54 <.10

-- 2612–TL3 R 04/08/02 1107 <.10 <.10 <.10

-- 2609–BL1 R 04/08/02 1110 99 3.4 <.10

-- 2616–BL4A R 04/08/02 1143 .80 .58 <.10

Data Tables  33
Table 3. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in State cooperative surface- and ground-water studies, 

2001–06.—Continued

[Sample type: FB, field blank; FR, field replicate; LD, laboratory duplicate; R, regular; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/

day/year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Mississippi Surface-Water Study (RRM)—Continued

-- 2613–UL2 R 04/08/02 1213 0.16 0.63 <0.10

-- 2608–BL4 R 04/08/02 1404 .45 .59 <.10

-- 2610–UL1 R 05/26/02 1415 7.0 2.7 <.10

-- 2614–UL2 R 05/26/02 1425 6.8 2.2 <.10

-- 2611–UL1 R 05/29/02 1915 1.3 .93 <.10

-- 201–DCVP R 09/04/02 1030 <.10 <.10 <.10

-- 201–DCC R 09/04/02 1500 <.10 1.0 <.10

LD 09/04/02 1500 .10 2.1 <.10

-- 201–DCRF R 09/05/02 0945 .48 3.1 <.10

-- 201–DCh R 09/05/02 1200 .86 4.1 <.10

-- 202–DCH R 09/05/02 1400 <.10 .14 <.10

-- 201–DCS R 09/05/02 1730 .11 1.1 <.10

-- 202–DCS FR 09/05/02 1731 .10 .90 <.10

-- 202–DCS LD 09/05/02 1731 .13 .78 <.10

-- 201–DCEL R 09/05/02 1600 .71 4.9 <.10

Nebraska Surface-Water Study (JPN) 

403119815550020 MW–7 R 07/31/02 1145 <.10 <.10 <.10

403119815550030 MW–8 R 07/31/02 0830 <.10 <.10 <.10

403119885550010 BLD 550 R 07/29/02 1330 <.10 <.10 <.10

LD 07/29/02 1330 <.10 <.10 <.10

403119981555004 MW–9 R 07/30/02 1245 <.10 <.10 <.10

403401981701003 MW–3 R 07/30/02 0845 <.10 <.10 <.10

403403981652010 MW–6 R 08/28/02 0815 <.10 <.10 <.10

403403981656010 MW–1 R 08/29/02 0930 <.10 <.10 <.10

LD 08/29/02 0930 <.10 <.10 <.10

403403981656020 MW–2 R 08/28/02 1400 <.10 <.10 <.10

40334498164601 PWS R 09/03/02 0915 <.10 <.10 <.10

40340398165202 MW–4 R 09/04/02 0800 <.10 <.10 <.10

40340398165203 MW–5 R 09/04/02 0945 <.10 <.10 <.10

34  Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 3. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in State cooperative surface- and ground-water studies, 

2001–06.—Continued

[Sample type: FB, field blank; FR, field replicate; LD, laboratory duplicate; R, regular; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/

day/year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

South Dakota Surface-Water Study (BSD) 

425740098161100 YST Wetlands Number 19 near Greenwood R 06/15/05 0915 0.39 1.5 <0.02

R 06/15/05 0945 .08 .14 <.02

425941098173400 YST Wetlands Number 18 near Wagner R 06/15/05 0835 .16 .08 <.02

R 06/15/05 1045 .07 .04 <.02

R 06/15/05 1635 .66 .34 <.02

430125098120600 YST Wetlands Number 17 near Dante R 06/13/05 1540 <.02 .26 <.02

430226098281400 YST Wetlands Number 12 near Pickstown R 06/16/05 0840 <.02 <.02 <.02

FR 06/16/05 0845 <.02 <.02 <.02

430300098253300 YST Wetlands Number 8 near Pickstown R 06/15/05 1655 .08 .38 <.02

R 06/16/05 0755 <.02 .29 <.02

FR 06/16/05 0800 .40 .32 <.02

430311098253000 YST Wetlands Number 23 near Ravinia R 06/16/05 1650 .18 .36 <.02

430443098102200 YST Wetlands Number 16 near Dry Choteau Creek near Dante R 06/13/05 1215 .07 <.02 <.02

430500098064000 YST Wetlands Number 15 near Dry Choteau Creek near Dante FR 06/13/05 1445 .10 <.02 <.02

430618098275800 YST Wetlands Number 22 near Old Landfill near Ravinia R 06/16/05 1255 <.02 <.02 <.02

FR 06/16/05 1300 .07 <.02 <.02

430735098193000 YST Wetlands Number 14 near Wagner R 06/13/05 1115 <.02 .32 <.02

LD 06/13/05 1115 <.02 .21 <.02

431116098355600 YST Wetlands Number 6 near Lake Andes R 06/16/05 1405 .13 <.02 <.02

431426098345800 YST Wetlands Number 5 (Goose Lake) near Geddes R 06/16/05 1455 .19 .20 <.02

431759098334000 YST Wetlands Number 4 (WPA) near Geddes R 06/16/05 1545 <.02 <.02 <.02

431853098322600 YST Wetlands Number 2 (Pheasant Acres) near Geddes R 06/14/05 0830 .10 <.02 <.02

LD 06/14/05 0830 .09 <.02 <.02

431907098321000 YST Wetlands Number 3 (Pheasant Acres East) near Geddes R 06/14/05 0955 .04 <.02 <.02

Vermont Surface-Water Study (ACV) 

04282815 Englesby Brook at Burlington R 06/26/06 1200 .08 .05 <.02

LD 06/26/06 1200 .06 .03 <.02

04282813 Potash Brook at Queen City Park Road near Burlington R 06/26/06 1245 .03 <.02 <.02

04292775 Stevens Brook at Lower Newton Street at St. Albans R 06/26/06 1445 .62 .09 <.02

04294000 Missiquoi River at Swanton R 06/27/06 1100 <.02 <.02 <.02

Data Tables  35
Table 3. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in State cooperative surface- and ground-water studies, 

2001–06.—Continued

[Sample type: FB, field blank; FR, field replicate; LD, laboratory duplicate; R, regular; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/

day/year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Washington Surface-Water Study (LMW) 

12113499 Taylor Creek at Lakeridge Park near Renton R 07/08/03 1305 <0.10 <0.10 <0.10

R 08/05/03 1300 <.10 <.10 <.10

R 10/18/03 0730 .16 <.10 <.10

R 11/18/03 1145 .10 <.10 <.10

12119600 May Creek at mouth near Renton R 07/08/03 1110 <.10 <.10 <.10

R 08/05/03 1105 <.10 <.10 <.10

R 10/16/03 1130 .23 <.10 <.10

R 11/18/03 1100 .21 <.10 <.10

12120000 Mercer Creek near Bellevue R 07/08/03 1505 .43 .14 <.10

R 08/05/03 1145 <.10 .10 <.10

R 10/16/03 0930 .48 <.10 <.10

R 11/18/03 1000 .68 <.10 <.10

LD 11/18/03 1000 .59 <.10 <.10

12125500 Bear Creek at Woodinville R 06/28/02 2145 2.0 .38 <.10

R 07/10/02 1115 <.10 <.10 <.10

R 08/21/02 1130 .12 .10 <.10

R 11/12/02 1230 .31 .15 <.10

12126200 North Creek at North Creek Parkway near Bothell R 06/28/02 2245 .10 <.10 <.10

R 07/10/02 1300 <.10 <.10 <.10

R 08/21/02 1215 <.10 <.10 <.10

R 11/12/02 1300 <.10 <.10 <.10

FB 11/12/02 1305 <.10 <.10 <.10

LD 11/12/02 1305 <.10 <.10 <.10

474243122083001 Sammamish River Irrigation Return at 124th Street R 06/28/02 2045 1.2 .52 <.10

LD 06/28/02 2045 .97 .53 <.10

R 07/10/02 1000 .79 .82 <.10

R 08/21/02 0945 1.3 1.3 <.10

LD 08/21/02 0945 .86 1.7 <.10

R 11/12/02 1200 .84 .48 <.10

LD 11/12/02 1200 .80 .45 <.10

36 Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 4. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Stream Quality Accounting Network Program 

(NASQAN) surface- and ground-water studies, 2002.

[ Sample type: FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less than; μg/L, micrograms per liter]

Site 

number 

(fig. 3)

Site 

location

Sample 

type

Date of 

collection (day/

month/

year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

03612500 Ohio River at Dam 53 near Grand Chain, Illinois R 04/25/02 1320 <0.10 <0.10 <0.10

R 05/07/02 1410 <.10 <.10 <.10

R 05/29/02 1400 <.10 <.10 <.10

R 06/12/02 1510 <.10 .15 <.10

R 06/26/02 1330 <.10 <.10 <.10

FR 06/26/02 1340 <.10 <.10 <.10

R 08/08/02 1410 <.10 .15 <.10

R 09/10/02 1410 <.10 .16 <.10

LD 09/10/02 1410 <.10 .16 <.10

FR 09/10/02 1420 <.10 .17 <.10

07022000 Mississippi River at Thebes, Illinois R 04/29/02 1410 <.10 .19 <.10

R 05/09/02 1010 <.10 <.10 <.10

R 05/14/02 1050 <.10 .13 <.10

R 06/12/02 1300 <.10 .32 <.10

R 07/10/02 1510 <.10 .27 <.10

R 08/14/02 1415 <.10 .29 <.10

LD 08/14/02 1415 <.10 .32 <.10

R 09/11/02 1305 <.10 .30 <.10

R 10/23/02 1355 <.10 .18 <.10

LD 10/23/02 1355 <.10 .12 <.10

07288955 Yazoo River below Steele Bayou near Long Lake, Mississippi R 04/12/02 1200 .33 <.10 <.10

R 05/10/02 1200 <.10 .17 <.10

R 06/27/02 1200 .14 .38 <.10

R 07/09/02 1200 <.10 <.10 <.10

07373420 Mississippi River near St. Francisville, Mississippi R 04/22/02 1130 <.10 <.10 <.10

R 05/07/02 1030 <.10 .12 <.10

R 05/28/02 1000 <.10 <.10 <.10

R 08/05/02 -- <.10 .25 <.10

R 08/19/02 1000 <.10 .20 <.10

R 09/09/02 1000 <.10 .23 <.10

Data Tables  37
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Albemarle-Pamilico Drainage Surface Water (APD) 

02091500 Contentnea Creek at Hookerton, North Carolina R 10/22/02 1430 <0.10 <0.10 <0.10

R 11/07/02 1600 <.10 <.10 <.10

FR 11/07/02 1601 <.10 <.10 <.10

LD 11/07/02 1601 <.10 <.10 <.10

R 12/10/02 1500 <.10 <.10 <.10

R 01/22/03 1400 <.10 <.10 <.10

LD 01/22/03 1400 <.10 <.10 <.10

FR 01/22/03 1401 <.10 <.10 <.10

FR 01/22/03 1402 <.10 <.10 <.10

R 02/12/03 1330 <.10 <.10 <.10

LD 02/12/03 1330 <.10 <.10 <.10

R 03/07/03 1315 <.10 <.10 <.10

R 03/18/03 1330 <.10 <.10 <.10

LD 03/18/03 1330 <.10 <.10 <.10

R 04/04/03 1200 <.10 <.10 <.10

R 04/21/03 1415 <.10 <.10 <.10

LD 04/21/03 1415 <.10 <.10 <.10

R 05/05/03 1445 <.10 <.10 <.10

R 05/28/03 1100 .18 <.10 <.10

R 06/05/03 1400 <.10 <.10 <.10

R 06/27/03 1120 <.10 <.10 <.10

FR 06/27/03 1121 <.10 <.10 <.10

R 07/16/03 1430 .17 <.10 <.10

R 07/29/03 1045 .12 <.10 <.10

R 08/05/03 1000 .11 .14 <.10

LD 08/05/03 1000 .13 .19 <.10

R 08/19/03 1400 <.10 <.10 <.10

38  Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Albemarle-Pamilico Drainage Surface Water (APD)—Continued

02091500 Contentnea Creek at Hookerton, North Carolina FR 08/19/03 1401 <0.10 <0.10 <0.10

R 09/02/03 1415 <.10 <.10 <.10

LD 09/02/03 1415 <.10 <.10 <.10

Albemarle-Pamilico Drainage Ground Water (APG) 

344737076354301 LU–S17A R 04/01/02 1230 <.10 <.10 <.10

344837076401701 LU–19A R 04/01/02 1430 <.10 <.10 <.10

345434076301501 LU–17 R 04/03/02 1000 <.10 <.10 <.10

345516077190001 LU–20 R 04/02/02 1000 <.10 <.10 <.10

345630077163501 LU–S20B R 04/02/02 1130 <.10 <.10 <.10

352305077321701 LU–15 R 04/18/02 1000 <.10 <.10 <.10

352548077012701 LU–14 R 04/17/02 1000 <.10 <.10 <.10

352702077302501 LU–S15A R 04/04/02 1200 <.10 <.10 <.10

352905077594501 LU–013 R 03/28/02 1015 <.10 <.10 <.10

LD 03/28/02 1015 <.10 <.10 <.10

352905077594501 LU–013 R 03/28/02 1030 <.10 <.10 <.10

353037077502601 LU–11A R 04/03/02 1600 <.10 <.10 <.10

LD 04/03/02 1600 <.10 <.10 <.10

353050077333402 L–24 R 04/29/02 1000 <.10 <.10 <.10

353111077334402 L6 R 04/29/02 1130 <.10 <.10 <.10

LD 04/29/02 1130 <.10 <.10 <.10

353148077332103 L11S R 04/29/02 1300 <.10 <.10 <.10

353219077153801 PI–532 R 05/09/02 1115 <.10 <.10 <.10

353221076105501 LU–S9C R 04/15/02 1245 <.10 <.10 <.10

353547076473301 LU–10A R 04/16/02 1430 <.10 <.10 <.10

035473307729802 ED–174 R 06/07/02 1130 <.10 <.10 <.10

LD 06/07/02 1130 <.10 <.10 <.10

354750076344501 LU–08 R 04/16/02 1200 <.10 <.10 <.10

355601076352401 LU–07A R 04/16/02 1015 <.10 <.10 <.10

361420077111401 BE–080 R 05/14/02 1215 <.10 <.10 <.10

Data Tables  39
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Albemarle-Pamilico Drainage Ground Water (APG)—Continued

361420077111401 BE–080 LD 05/14/02 1215 <0.10 <0.10 <0.10

361702076330101 LU–05 R 05/01/02 1515 <.10 <.10 <.10

R 05/01/02 1530 <.10 <.10 <.10

361714076201301 LU–04A R 04/30/02 1345 .16 <.10 <.10

R 04/30/02 1400 .12 <.10 <.10

362527076163301 LU–03 R 05/01/02 1130 <.10 <.10 <.10

LD 05/01/02 1130 <.10 <.10 <.10

362646076361607 GA–067 R 05/13/02 1215 <.10 <.10 <.10

R 05/13/02 1230 <.10 <.10 <.10

363106076113201 LU–S3A R 05/01/02 1315 <.10 <.10 <.10

363529076291701 LU–12 R 03/26/02 1000 <.10 <.10 <.10

R 03/26/02 1200 <.10 <.10 <.10

363948076112601 LU–02A R 05/06/02 1200 <.10 <.10 <.10

364535076041201 LU–01 R 05/06/02 1430 <.10 <.10 <.10

364535076041201 LU–12 R 05/07/02 1130 <.10 <.10 <.10

Apalachicola-Chattahoochee-Flint River Basin Surface Water (ACF) 

02335870 Sope Creek near Marietta, Georgia R 05/30/02 1145 <.10 <.10 <.10

R 06/12/02 1030 <.10 <.10 <.10

FR 06/12/02 1031 <.10 <.10 <.10

R 06/24/02 1030 <.10 <.10 <.10

R 07/09/02 1115 <.10 <.10 <.10

R 08/06/02 1200 <.10 <.10 <.10

R 08/21/02 1530 .11 <.10 <.10

R 10/09/02 1400 <.10 <.10 <.10

R 11/08/02 1700 <.10 <.10 <.10

R 12/18/02 1130 <.10 <.10 <.10

R 01/14/03 1600 <.10 <.10 <.10

R 02/13/03 1315 <.10 <.10 <.10

R 03/17/03 1330 .32 <.10 <.10

40 Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Apalachicola-Chattahoochee-Flint River Basin Surface Water (ACF)—Continued

02335870 Sope Creek near Marietta, Georgia—Continued FR 03/17/03 1337 0.38 <0.10 <0.10

R 04/04/03 1315 <.10 <.10 <.10

R 04/15/03 1400 <.10 <.10 <.10

R 05/01/03 1030 <.10 <.10 <.10

R 05/13/03 1402 <.10 <.10 <.10

R 05/13/03 1430 <.10 <.10 <.10

R 05/28/03 1345 <.10 <.10 <.10

R 06/16/03 1130 <.10 <.10 <.10

R 07/01/03 1415 .11 <.10 <.10

FR 07/01/03 1417 <.10 <.10 <.10

R 07/14/03 1545 <.10 .11 <.10

R 07/30/03 0830 <.10 .15 <.10

R 08/11/03 1130 .13 .11 <.10

R 08/26/03 1202 <.10 <.10 <.10

FR 08/26/03 -- <.10 <.10 <.10

R 09/09/03 1130 <.10 <.10 <.10

02338523 Hillabahatchee Creek at Franklin Road near 

Franklin, Georgia

R 06/12/02 1500 <.10 <.10 <.10

R 07/10/02 1500 <.10 <.10 <.10

02350080 Lime Creek near Cobb, Georgia R 05/31/02 0930 <.10 <.10 <.10

R 06/05/02 -- <.10 <.10 <.10

R 06/13/02 0900 <.10 <.10 <.10

R 06/26/02 0900 <.10 <.10 <.10

LD 06/26/02 0900 <.10 <.10 <.10

LD 07/11/02 0915 <.10 .10 <.10

R 07/11/02 0915 <.10 .10 <.10

R 08/22/02 0900 <.10 <.10 <.10

Data Tables  41
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Apalachicola-Chattahoochee-Flint River Basin Surface Water (ACF)—Continued

02350080 Lime Creek near Cobb, Georgia—Continued R 10/10/02 1000 <0.10 <0.10 <0.10

R 11/08/02 1045 <.10 <.10 <.10

LD 11/08/02 1045 <.10 <.10 <.10

R 12/04/02 1030 <.10 <.10 <.10

R 01/16/03 1130 <.10 <.10 <.10

R 02/12/03 1000 <.10 <.10 <.10

R 03/20/03 1145 <.10 <.10 <.10

R 04/03/03 0915 <.10 <.10 <.10

R 04/17/03 1100 <.10 <.10 <.10

R 05/01/03 1530 <.10 <.10 <.10

R 05/15/03 1045 <.10 <.10 <.10

R 05/28/03 0900 <.10 <.10 <.10

LD 05/28/03 0900 <.10 <.10 <.10

R 06/18/03 0830 <.10 <.10 <.10

R 07/03/03 1030 <.10 <.10 <.10

FR 07/03/03 1037 <.10 <.10 <.10

R 07/24/03 1030 <.10 .38 <.10

R 07/30/03 1300 <.10 .13 <.10

R 08/14/03 1230 <.10 <.10 <.10

FR 08/14/03 1237 <.10 <.10 <.10

R 08/29/03 1045 <.10 <.10 <.10

R 09/10/03 0915 <.10 <.10 <.10

Apalachicola-Chattahoochee-Flint River Basin Ground Water (ACG)

304450084402801 08DO92 R 08/28/03 1200 <.10 <.10 <.10

305641084542001 06F087 R 04/22/02 1200 <.10 <.10 <.10

LD 04/22/02 1200 <.10 <.10 <.10

310552084435601 08G008 R 04/11/02 1600 <.10 <.10 <.10

FR 04/11/02 1601 <.10 <.10 <.10

42 Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Apalachicola-Chattahoochee-Flint River Basin Ground Water (ACG)—Continued

310604084351901 09G011 R 09/24/03 1500 <0.10 <0.10 <0.10

310752085271301 CP 13 R 03/20/02 1200 .13 .10 <.10

310913084195301 11H014 R 04/10/02 1200 <.10 <.10 <.10

311015084511901 07H021 R 04/22/02 1700 <.10 <.10 <.10

FR 04/22/02 1702 <.10 <.10 <.10

311141084513401 AC 35 R 03/05/02 1400 <.10 <.10 <.10

311327084484101 REF 41 R 03/21/02 1600 <.10 <.10 <.10

LD 03/21/02 1600 <.10 <.10 <.10

311505085140101 CP 14 R 03/07/02 1200 <.10 <.10 <.10

FR 03/07/02 1201 <.10 <.10 <.10

311707084433302 08JK017 R 09/03/03 1400 <.10 <.10 <.10

311714084275101 REF 44 R 03/21/02 1200 <.10 <.10 <.10

312119084215601 11J021 R 04/08/02 1700 <.10 <.10 <.10

312241084244401 10K007 R 09/24/03 0900 <.10 <.10 <.10

312346084520401 CP 17 R 03/06/02 1500 <.10 <.10 <.10

312908084151901 11K045 R 04/09/02 1700 <.10 <.10 <.10

LD 04/09/02 1700 <.10 <.10 <.10

313415084475201 07L021 R 04/23/02 1200 <.10 <.10 <.10

313521083501402 15L033 R 11/04/03 0900 <.10 <.10 <.10

FR 11/04/03 0902 <.10 <.10 <.10

314040084110201 CP 28 R 03/18/02 1200 <.10 <.10 <.10

314357084380001 CP15 R 03/06/02 1100 <.10 <.10 <.10

314727084043502 13N012 R 09/25/03 1700 <.10 <.10 <.10

314858084194901 11N010 R 04/08/02 1200 <.10 <.10 <.10

315009083571001 CP 27 R 03/18/02 1600 <.10 <.10 <.10

FR 03/18/02 1603 <.10 <.10 <.10

315237084023402 13PO13 R 09/02/03 1700 <.10 <.10 <.10

320001084032801 LC 8 R 03/22/02 1200 <.10 <.10 <.10

Data Tables  43
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Apalachicola-Chattahoochee-Flint River Basin Ground Water (ACG)—Continued

320011084121501 CP 26 R 03/04/02 1100 <0.10 <0.10 <0.10

LD 03/04/02 1100 <.10 <.10 <.10

320051084061401 LC 6 R 03/08/02 1100 <.10 <.10 <.10

Central Columbia Plateau Surface Water (CCY)

12505450 Granger Drain at Granger, Washington R 10/16/02 1230 <.10 <.10 <.10

R 11/20/02 1130 <.10 <.10 <.10

LD 11/20/02 1130 <.10 <.10 <.10

R 12/18/02 1220 <.10 <.10 <.10

R 01/21/03 1300 <.10 <.10 <.10

R 02/19/03 1100 <.10 <.10 <.10

FR 02/19/03 1108 <.10 <.10 <.10

FR 02/19/03 1109 <.10 <.10 <.10

R 03/04/03 0940 <.10 <.10 <.10

R 03/18/03 0930 <.10 <.10 <.10

R 04/03/03 0951 <.10 <.10 <.10

FR 04/03/03 0950 <.10 <.10 <.10

R 04/15/03 1020 .17 <.10 <.10

R 05/08/03 0940 .17 <.10 <.10

LD 05/08/03 0940 .19 <.10 <.10

R 05/20/03 0950 <.10 <.10 <.10

R 06/02/03 0950 .88 .12 <.10

LD 06/02/03 0950 .85 .12 <.10

R 06/16/03 1100 .16 <.10 <.10

R 07/07/03 0930 .19 <.10 <.10

R 07/21/03 0950 .38 .14 <.10

R 08/06/03 0830 .62 .19 <.10

R 08/20/03 1000 .13 <.10 <.10

44  Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Central Columbia Plateau Surface Water (CCY)—Continued

12505450 Granger Drain at Granger, Washington R 09/16/03 0850 <0.10 <0.10 <0.10

12510500 Yakima River at Kiona, Washington R 10/15/02 1140 <.10 <.10 <.10

462023120075200 DR2 at Yakima Valley Highway near Granger, 

Washington

R 09/16/03 1320 .11 <.10 <.10

Central Nebraska Basin Surface Water (CNB)

06799750 K7 R 03/25/04 1115 <.02 <.02 <.02

06799750 K7 (fall) R 05/08/04 2320 .65 1.6 .13

06799750 K7 (fall) LD 05/08/04 2320 .65 1.6 <.02

06799750 K7 (composite) R 05/10/04 0100 .24 .76 .13

06799750 K7 (rise) R 05/10/04 0148 .17 .85 <.02

06799750 K7 (peak) R 05/10/04 0244 .26 .96 <.02

06799750 K7 (fall) R 05/10/04 0446 .27 1.1 .15

06799750 K7 (composite) R 05/13/04 0450 .15 .80 <.02

06799750 K7 (rise/peak) R 05/13/04 0554 .14 .66 <.02

06799750 K7 (fall) R 05/13/04 0739 .26 .76 <.02

06799750 K7 (fall) LD 05/13/04 0739 .26 .76 <.02

06799750 K7 R 05/22/04 1020 .22 .66 <.02

R 05/22/04 1831 .10 .50 <.02

R 05/22/04 1930 .05 .40 <.02

R 05/22/04 2047 .17 .74 <.02

R 06/02/04 2030 .06 .34 <.02

R 06/16/04 1026 .65 .70 <.02

LD 06/16/04 1026 .70 .52 <.02

R 06/29/04 1010 1.0 1.2 <.02

FR 06/29/04 1020 1.4 1.0 <.02

R 07/07/04 1447 4.6 5.4 <.02

FR 07/07/04 1500 1.0 1.4 <.02

Data Tables  45
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Central Nebraska Basin Surface Water (CNB)—Continued

06799750 K7 FR 07/07/04 1655 9.7 5.2 <0.02

R 07/22/04 0905 1.4 2.3 <.02

R 08/25/04 1400 .32 1.7 <.02

R 08/31/04 1030 .12 .09 <.02

R 09/23/04 0250 <.02 .33 <.02

LD 09/23/04 0250 <.02 .49 <.02

06800000 Maple Creek near Nickerson, Nebraska R 07/22/02 1000 <.10 .56 <.10

R 10/08/02 1000 <.10 .34 <.10

R 11/13/02 1000 <.10 <.10 <.10

FR 11/13/02 1001 <.10 <.10 <.10

R 12/10/02 1030 <.10 <.10 <.10

R 01/14/03 1000 <.10 <.10 <.10

LD 01/14/03 1000 <.10 <.10 <.10

R 02/11/03 0930 <.10 <.10 <.10

R 03/11/03 0930 <.10 .20 <.10

R 04/16/03 1000 <.10 .13 <.10

R 04/30/03 1030 <.10 .59 <.10

LD 04/30/03 1030 <.10 .48 <.10

R 05/13/03 1000 <.10 .45 <.10

R 05/27/03 1000 <.10 .26 <.10

LD 05/27/03 1000 <.10 .28 <.10

FR 05/27/03 1010 <.10 .27 <.10

R 06/10/03 1000 <.10 .45 <.10

R 06/23/03 1300 .29 .69 <.10

R 06/23/03 1301 <.10 <.10 <.10

R 07/09/03 1000 .35 1.1 <.10

46 Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Central Nebraska Basin Surface Water (CNB)—Continued

06800000 Maple Creek near Nickerson, Nebraska—

Continued

R 08/04/03 1000 <0.10 0.50 <0.10

FR 08/04/03 1010 <.10 .46 <.10

R 08/19/03 1100 <.10 .27 <.10

R 09/02/03 1100 <.10 .12 <.10

R 09/16/03 0930 .16 .35 <.10

LD 09/16/03 0930 .15 .43 <.10

R 03/31/04 1030 .16 .29 <.10

R 04/07/04 1100 <.10 1.4 <.10

LD 04/07/04 1100 <.10 1.4 <.10

R 04/12/04 1000 .06 .15 .15

FR 04/12/04 1007 .05 .16 .16

R 04/19/04 1000 <.02 1.6 <.02

FR 04/19/04 1007 <.02 1.5 <.02

R 04/27/04 1000 .11 .62 .11

LD 04/27/04 1000 .15 .62 .12

R 05/03/04 1030 .08 .19 .12

LD 05/03/04 1030 .07 .19 .11

R 05/13/04 1030 .20 .56 .12

LD 05/13/04 1030 .26 .56 .13

R 05/18/04 0930 .06 .63 <.02

LD 05/18/04 0930 <.02 .63 <.02

R 05/25/04 1030 .09 .58 <.02

LD 05/25/04 1030 .09 .59 <.02

R 06/01/04 1100 .28 .38 <.02

LD 06/01/04 1100 .27 .82 <.02

R 06/08/04 1030 .20 .70 <.02

R 06/15/04 1030 .26 .64 <.02

Data Tables  47
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Central Nebraska Basin Surface Water (CNB)—Continued

06800000 Maple Creek near Nickerson, Nebraska—

Continued

R 06/22/04 0930 0.18 0.52 <0.02

R 06/29/04 0830 .08 .36 <.02

LD 06/29/04 0830 .06 .42 <.02

R 07/06/04 1300 .53 1.1 <.02

LD 07/06/04 1300 .53 1.1 <.02

R 07/13/04 1030 .50 1.9 <.02

R 07/13/04 1032 <.02 <.02 <.02

R 07/20/04 1000 .37 1.1 <.02

R 07/27/04 0945 .35 .63 <.02

LD 07/27/04 0945 .35 1.3 <.02

R 08/04/04 1000 .27 .77 <.02

FR 08/04/04 1007 .23 .90 <.02

R 08/10/04 0930 .32 1.5 <.02

R 08/17/04 1030 .11 .43 <.02

R 08/24/04 1030 1.1 .43 <.02

FB 08/24/04 1032 <.02 <.02 <.02

R 08/30/04 0900 <.02 .44 <.02

R 09/07/04 0930 <.02 .35 <.02

06800500 Elkhorn River near Waterloo, Nebraska R 10/09/02 1030 <.10 1.3 <.10

R 11/14/02 1100 <.10 .41 <.10

R 12/11/02 1100 <.10 .19 <.10

R 01/15/03 0930 <.10 .32 <.10

R 02/12/03 1000 <.10 .22 <.10

R 03/12/03 1100 <.10 .42 <.10

FR 03/12/03 1110 <.10 .38 <.10

R 04/17/03 1100 <.10 .39 <.10

R 05/01/03 1000 <.10 .37 <.10

48  Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Central Nebraska Basin Surface Water (CNB)—Continued

06800500 Elkhorn River near Waterloo, Nebraska—

Continued

R 05/14/03 1000 <0.10 0.21 <0.10

R 05/28/03 1000 <.10 .34 <.10

FR 05/28/03 1010 <.10 .50 <.10

R 06/11/03 0930 <.10 .45 <.10

LD 06/11/03 0930 <.10 .50 <.10

R 06/24/03 1100 .26 .68 <.10

R 07/07/03 1401 <.10 <.10 <.10

R 07/10/03 0930 .3 .84 <.10

R 07/23/03 1000 <.10 .58 <.10

R 08/06/03 1030 <.10 .60 <.10

R 08/20/03 1000 <.10 1.4 <.10

R 09/03/03 1200 <.10 1.1 <.10

R 09/17/03 1000 .11 .92 <.10

Central Nebraska Basin Ground Water (CNG) 

413302097090530 Vadose zone ACT VZ1–1A near Schuyler, 

Nebraska

R 05/10/04 2005 .13 .28 .28

R 05/11/04 1105 .18 .32 .30

R 05/14/04 0815 .15 .53 <.02

R 05/24/04 1005 .14 .25 <.02

R 06/22/04 1020 .21 .62 <.02

R 07/06/04 1035 <.02 <.02 <.02

R 07/22/04 0925 <.02 <.02 <.02

R 07/23/04 0900 .10 .31 <.02

413302097090533 Vadose zone ACT VZ1–1D near Schuyler, 

Nebraska

R 04/02/04 1040 <.02 <.02 <.02

413334096325330 Vadose zone ACT VZ1–2A near Nickerson, 

Nebraska

R 05/11/04 1400 .02 .14 .31

R 05/14/04 1030 .03 .18 <.02

R 05/18/04 1605 .03 .08 <.02

R 05/24/04 1235 .02 .09 <.02

Data Tables  49
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Central Nebraska Basin Ground Water (CNG)—Continued

413334096325330 Vadose zone ACT VZ1–2A near Nickerson, 

Nebraska

R 07/06/04 1240 <0.02 <0.02 <0.02

413334096325331 Vadose zone ACT VZ1–2B near Nickerson, 

Nebraska

R 03/30/04 1200 <.02 <.02 <.02

R 04/12/05 1518 <.02 .02 <.02

R 05/11/04 1405 .03 .07 .26

R 06/14/04 1140 <.02 .30 <.02

R 07/06/04 1245 <.02 <.02 <.02

413334096325332 Valdose zone ACT VZ1–2C near Nickerson, 

Nebraska

R 04/15/04 1035 <.02 <.02 <.02

FR 04/15/04 1040 <.02 <.02 <.02

413341096325530 Vadose zone ACT VZ1–3A near Nickerson, 

Nebraska

R 06/14/04 1200 <.02 .29 <.02

R 07/06/04 1255 <.02 <.02 <.02

413341096325531 Vadose zone ACT VZ1–3B near Nickerson, 

Nebraska

R 05/11/04 1430 .04 .14 .29

R 05/14/04 1015 .04 .16 <.02

R 05/18/04 1555 .04 .15 <.02

R 05/24/04 1225 .03 .10 <.02

R 06/14/04 1205 <.02 .19 <.02

R 07/06/04 1300 <.02 .17 <.02

R 08/19/04 1150 <.02 .06 <.26

R 04/12/05 1540 <.02 .46 <.02

413350096324730 Vadose zone ACT VZ1–4A near Nickerson, 

Nebraska

R 05/11/04 1345 .02 .08 .26

R 05/24/04 1250 <.02 .04 <.02

R 06/14/04 1120 .08 .33 <.02

413350096324731 Vadose zone ACT VZ1–4B near Nickerson, 

Nebraska

R 05/24/04 1255 .02 .06 <.02

R 06/14/04 1125 .06 .20 <.02

R 08/19/04 1405 <.02 .04 <.02

R 07/06/04 1225 .67 .21 <.02

50 Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Central Nebraska Basin Ground Water (CNG)—Continued

413350096324731 Vadose zone ACT VZ1–4B near Nickerson, 

Nebraska

R 04/12/05 1605 <0.02 <0.02 <0.02

413350096324732 Vadose zone ACT VZ1–4C near Nickerson, 

Nebraska

R 03/31/04 0815 <.02 <.02 <.02

R 05/11/04 1355 .05 .12 <.02

R 05/14/04 1120 .03 .17 <.02

R 05/24/04 1300 <.02 .03 <.02

R 06/14/04 1130 <.02 .24 <.02

R 08/19/04 1410 <.02 <.02 <.02

R 04/12/05 1607 <.02 <.02 <.02

Connecticut, Housatonic, and Thames River Basins Surface Water (CON)

01209710 Norwalk River at Winnipauk, Connecticut R 10/21/02 1030 <.10 <.10 <.10

R 11/14/02 1320 <.10 <.10 <.10

R 12/23/02 1310 <.10 <.10 <.10

LD 12/23/02 1310 <.10 <.10 <.10

R 01/16/03 1040 <.10 <.10 <.10

R 01/16/03 1140 <.10 <.10 <.10

R 02/11/03 1245 <.10 <.10 <.10

R 03/25/03 1145 <.10 <.10 <.10

FR 03/25/03 1146 <.10 <.10 <.10

R 03/31/03 1140 <.10 <.10 <.10

R 04/10/03 1030 <.10 <.10 <.10

FR 04/10/03 1110 <.10 <.10 <.10

LD 04/10/03 1110 <.10 <.10 <.10

R 04/21/03 1015 <.10 <.10 <.10

R 05/06/03 1045 <.10 <.10 <.10

R 05/21/03 1200 <.10 <.10 <.10

R 06/03/03 1030 <.10 <.10 <.10

FR 06/03/03 1031 <.10 <.10 <.10

Data Tables  51
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Connecticut, Housatonic, and Thames River Basins Surface Water (CON)—Continued

01209710 Norwalk River at Winnipauk, Connecticut—

Continued

R 07/08/03 1030 <0.10 <0.10 <0.10

LD 07/08/03 1030 <.10 <.10 <.10

R 06/24/03 0930 <.10 <.10 <.10

FR 06/24/03 1000 <.10 <.10 <.10

R 07/30/03 1115 <.10 <.10 <.10

R 08/06/03 0910 <.10 <.10 <.10

R 08/14/03 0950 <.10 .12 <.10

R 09/03/03 1130 <.10 .12 <.10

Delmarva Peninsula Ground Water (JMD)

380027075410802 SOD344 R 08/02/01 0930 <0.10 <0.10 <0.10

380358075292901 WO Fe 1 R 01/15/03 1100 <.10 <.10 <.10

380403075292901 WOFc46 FB 09/06/01 1000 <.10 <.10 <.10

R 09/06/01 0950 <.10 <.10 <.10

FR 09/06/01 1030 <.10 <.10 <.10

381245075404001 26D–R R 11/01/01 1200 <.10 <.10 <.10

381245075404002 SO Be 114 R 01/16/03 1100 <.10 <.10 <.10

381543075273801 WOCc2 R 08/08/01 1100 <.10 <.10 <.10

LD 08/08/01 1100 <.10 <.10 <.10

381543075273802 WOCc3 R 08/08/01 1430 <.10 <.10 <.10

381754075083601 WOCg76 R 08/09/01 0900 <.10 <.10 <.10

381754075083603 WOCg78 R 08/09/01 1300 <.10 <.10 <.10

382403075233201 WICh50 R 09/24/01 1000 <.10 <.10 <.10

FR 09/24/01 1030 <.10 <.10 <.10

382824075081502 Ri22–10 R 01/14/03 1400 <.10 <.10 <.10

382825075081601 Ri22–03 R 09/05/01 1100 <.10 <.10 <.10

382833075213701 Rf24–08 R 01/16/03 1400 <.10 <.10 <.10

LD 01/16/03 1400 <.10 <.10 <.10

382927075211701 Rf14–02 R 10/11/01 1000 <.10 <.10 <.10

52 Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Delmarva Peninsula Ground Water (JMD)—Continued

383051075495601 DOCh1 R 11/13/01 1100 <0.10 <0.10 <0.10

383225075565002 DOCf36 R 10/10/01 1100 <.10 <.10 <.10

FR 10/10/01 1110 <.10 <.10 <.10

R 10/10/01 1130 <.10 <.10 <.10

383231075383101 22–D–R R 10/30/01 1100 <.10 <.10 <.10

383308075382301 Qc22–04 R 08/28/01 1100 <.10 <.10 <.10

383328076153602 DOCb8 R 08/07/01 1030 <.10 <.10 <.10

LD 08/07/01 1030 <.10 <.10 <.10

384418075231101 Of12–05 R 01/22/03 1130 <.10 <.10 <.10

384606075115801 19–D–R R 10/29/01 1100 <.10 <.10 <.10

384630075524801 COEc25 R 08/27/01 1200 <.10 <.10 <.10

LD 08/27/01 1200 <.10 <.10 <.10

384631075524901 COEc36 R 12/10/02 1100 <.10 <.10 <.10

384637075153201 Ng45–02 R 12/19/02 1100 <.10 <.10 <.10

FR 12/19/02 1105 <.10 <.10 <.10

R 12/19/02 1300 <.10 <.10 <.10

384946076002201 TA Cc53 R 12/10/02 1400 <.10 <.10 <.10

385009075445001 CODe15 R 08/22/01 1000 <.10 <.10 <.10

R 08/22/01 1230 <.10 <.10 <.10

385023076012601 TABe83 R 11/07/01 1100 <.10 <.10 <.10

LD 11/07/01 1100 <.10 <.10 <.10

385134075480401 CO Db79 R 12/17/02 1100 <.10 <.10 <.10

385208075460801 CODd74 R 11/06/01 1100 <.10 <.10 <.10

385305076042901 TABe83 R 11/07/01 1000 <.10 <.10 <.10

390156076184001 QADb45 R 10/04/01 1000 <.10 <.10 <.10

FR 10/04/01 1010 <.10 <.10 <.10

390217076181401 QADb40 R 08/29/01 1100 <.10 <.10 <.10

Data Tables  53
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Delmarva Peninsula Ground Water (JMD)—Continued

390217076181401 QADb40 LD 08/29/01 1100 <0.10 <0.10 <0.10

390918075291701 Equipment blank R 11/29/01 1300 <.10 <.10 <.10

LD 11/29/01 1330 <.10 <.10 <.10

R 12/09/02 1530 <.10 <.10 <.10

391240075432001 Ib32–08 R 12/17/02 1500 <.10 <.10 <.10

392057075443601 Gb51–07 R 01/28/03 1100 <.10 <.10 <.10

392403075362101 GC14–04 R 12/09/02 1200 <.10 <.10 <.10

LD 12/09/02 1200 <.10 <.10 <.10

FR 12/09/02 1205 <.10 <.10 <.10

392414075361001 Ib32–05 DLMV NAWQA R 08/23/01 0930 <.10 <.10 <.10

394224075340501 Cd31–19 DLMV NAWQA R 08/06/01 1000 <.10 <.10 <.10

Eastern Iowa Basin Surface Water (SKI)

05420500 Mississippi River at Clinton, Iowa R 05/09/01 1040 <.10 <.10 <.10

LD 05/09/01 1040 <.10 <.10 <.10

05448095 Mississippi River at Buffalo, Iowa R 04/25/01 0915 <.10 <.10 <.10

05466000 Mississippi River at Keith, Iowa R 04/26/01 1730 <.10 <.10 <.10

05492200 Mississippi River at Alexandria, Missouri R 04/26/01 1215 <.10 .12 <.10

05587455 Mississippi River below Grafton, Illinois R 05/14/01 1445 <.10 <.10 <.10

Eastern Iowa Basin Ground Water (SKI)

421850093092501 USGS Monitoring Well FS1–11 R 12/20/05 1700 <.02 <.02 <.02

421853093091601 USGS Monitoring Well FS1–3A R 12/21/05 1330 <.02 <.02 <.02

421853093091603 USGS Monitoring Well FS1–3C R 12/21/05 1600 <.02 <.02 <.02

421854093091501 USGS Monitoring Well FS1–4A R 12/22/05 1615 <.02 <.02 <.02

LD 12/22/05 1615 <.02 <.02 <.02

421854093091502 USGS Monitoring Well FS1–4B R 12/22/05 1415 <.02 <.02 <.02

FR 12/22/05 1420 <.02 <.02 <.02

421854093091503 USGS Monitoring Well FS1–4C R 12/22/05 1315 <.02 <.02 <.02

421855093091601 USGS Monitoring Well FS1–5A R 12/29/05 1745 <.02 <.02 <.02

421855093091602 USGS Monitoring Well FS1–5B R 12/30/05 1200 <.02 <.02 <.02

54  Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Eastern Iowa Basin Ground Water (SKI)—Continued

421856093091501 USGS Monitoring Well TR1–1A R 12/23/05 1145 <0.02 <0.02 <0.02

421856093091502 USGS Monitoring Well TR1–2B R 12/29/05 1145 <.02 <.02 <.02

Georgia-Florida Coastal Plain Surface Water (GFL)

02317797 Little River at Upper Ty Ty Road near Tifton, 

Georgia

R 11/04/02 1250 <.10 <.10 <.10

FR 11/04/02 1300 <.10 <.10 <.10

R 12/03/02 1300 <.10 <.10 <.10

R 02/04/03 1200 <.10 <.10 <.10

FR 02/04/03 1210 <.10 <.10 <.10

R 02/18/03 1140 <.10 <.10 <.10

LD 02/18/03 1140 <.10 <.10 <.10

R 03/04/03 1300 <.10 <.10 <.10

R 03/19/03 1210 <.10 <.10 <.10

R 03/31/03 1240 <.10 <.10 <.10

R 04/14/03 1220 <.10 <.10 <.10

R 05/06/03 1330 <.10 <.10 <.10

R 05/16/03 1020 <.10 <.10 <.10

FR 05/16/03 1030 <.10 <.10 <.10

R 06/02/03 1120 <.10 <.10 <.10

R 06/30/03 1130 <.10 <.10 <.10

R 08/05/03 1200 <.10 <.10 <.10

R 08/19/03 1230 <.10 <.10 <.10

R 09/02/03 1300 <.10 <.10 <.10

R 06/16/03 1300 <.10 <.10 <.10

R 01/07/03 1310 <.10 <.10 <.10

R 01/21/03 1300 <.10 <.10 <.10

02318500 Withlacoochee River at U.S. 84 near Quitman, 

Georgia

R 10/01/02 1130 <.10 .15 <.10

R 11/06/02 1400 <.10 <.10 <.10

Data Tables  55
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Georgia-Florida Coastal Plain Surface Water (GFL)—Continued

02318500 Withlacoochee River at U.S. 84 near Quitman, 

Georgia

R 12/04/02 1100 <0.10 <0.10 <0.10

R 01/08/03 1310 <.10 <.10 <.10

R 02/03/03 1340 <.10 <.10 <.10

FR 02/03/03 1330 <.10 <.10 <.10

Great and Little Miami River Basins Surface Water (BET)

03267900 Mad River at St. Paris Pike at Eagle City, Ohio R 09/19/01 1200 <.10 <.10 <.10

FR 09/19/01 1208 <.10 <.10 <.10

R 12/05/01 1100 <.10 .16 <.10

R 10/17/01 1200 <.10 <.10 <.10

R 11/06/01 0930 <.10 .11 <.10

LD 11/06/01 0930 <.10 .14 <.10

R 01/09/02 1030 <.10 .14 <.10

LD 01/09/02 1030 <.10 .10 <.10

03274000 Great Miami River at Hamilton, Ohio R 09/18/01 1100 .1 1.2 <.10

Great and Little Miami River Basins Ground Water (BET)

390744084212501 URB–02 at Newton, Ohio R 11/29/01 1100 <.10 <.10 <.10

LD 11/29/01 1100 <.10 <.10 <.10

391226084272501 URB–31at Cincinnati, Ohio R 11/28/01 1000 <.10 <.10 <.10

391518084485201 URB–04 at Harrison, Ohio R 11/15/01 1400 <.10 <.10 <.10

R 11/15/01 1000 <.10 <.10 <.10

FR 11/15/01 1005 <.10 <.10 <.10

391849084381901 URB–01 at Ross, Ohio R 11/27/01 1400 <.10 <.10 <.10

392008084335501 URB–06 at Fairfield, Ohio R 11/14/01 1500 <.10 <.10 <.10

392008084343801 URB–07 at Fairfield, Ohio R 11/26/01 1500 <.10 <.10 <.10

392047084325101 URB–15 at Fairfield, Ohio R 11/14/01 1100 <.10 <.10 <.10

FR 11/14/01 1101 <.10 <.10 <.10

392049084340301 URB–08 at Fairfield, Ohio R 11/27/01 1000 <.10 <.10 <.10

392121084332101 URB–29 at Hamilton, Ohio R 11/13/01 1600 <.10 <.10 <.10

392917084205601 URB–11 at Middletown, Ohio R 11/07/01 1500 <.10 <.10 <.10

56 Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Great and Little Miami River Basins Ground Water (BET)—Continued

393405084203701 URB–12 at Carlisle, Ohio R 11/06/01 1100 <0.10 <0.10 <0.10

393453084131801 URB–13 at Carlisle, Ohio R 11/05/01 1400 <.10 <.10 <.10

393812084240001 REF–02 at Germantown Dam, Ohio R 11/07/01 1100 <.10 <.10 <.10

393944084120700 Holes Creek at Huffman Park at Kettering, Ohio R 08/15/01 1400 <.10 <.10 <.10

R 09/20/01 1200 <.10 <.10 <.10

LD 09/20/01 1200 <.10 <.10 <.10

393954084132001 URB–17 at West Carrollton, Ohio R 11/01/01 1200 <.10 <.10 <.10

393956083575601 URB–23 at Xenia, Ohio R 10/25/01 1200 <.10 <.10 <.10

LD 10/25/01 1200 <.10 <.10 <.10

394025084132501 URB–14 at West Carrollton, Ohio R 10/31/01 1200 <.10 <.10 <.10

394103084124901 URB–18 at Moraine, Ohio R 10/31/01 1600 <.10 <.10 <.10

FR 10/31/01 1605 <.10 <.10 <.10

394234084024301 URB–16 at Beavercreek, Ohio R 10/22/01 1600 <.10 <.10 <.10

394256084040701 URB–19 at Beavercreek, Ohio R 10/23/01 1200 <.10 <.10 <.10

FR 10/23/01 1201 <.10 <.10 <.10

394320084044301 URB–20 R 10/04/01 1400 <.10 <.10 <.10

395210083565001 URB–22 at Enon, Ohio R 10/24/01 1200 <.10 <.10 <.10

395218084100801 REF–01 at Taylorsville, Ohio R 10/18/01 1200 <.10 <.10 <.10

395244084011901 URB–26 at Medway, Ohio R 12/03/01 1500 <.10 <.10 <.10

LD 12/03/01 1500 <.10 <.10 <.10

395247084015801 URB–25 at Crystal Lakes, Ohio R 12/03/01 1100 <.10 <.10 <.10

395614084020301 URB–24 at New Carlisle, Ohio R 10/17/01 1400 <.10 <.10 <.10

400642083441601 URB–21 at Ur, Ohio R 10/03/01 1400 <.10 <.10 <.10

Lake Erie-Lake St. Clair Drainage Surface Water (BET)

04161820 Clinton River at Sterling Heights, Michigan R 08/29/01 1000 .15 .28 <.10

R 09/18/01 1030 <.10 <.10 <.10

04175600 River Raisin near Manchester, Michigan R 08/29/01 1330 <.10 <.10 <.10

R 09/18/01 1400 <.10 <.10 <.10

04178000 St. Joseph River near Newville, Indiana R 08/28/01 1400 <.10 <.10 <.10

Data Tables  57
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Lake Erie-Lake St. Clair Drainage Surface Water (BET)—Continued

04178000 St. Joseph River near Newville, Indiana R 09/17/01 1500 <0.10 <0.10 <0.10

04186500 Auglaize River near Ft. Jennings, Ohio R 08/28/01 1130 <.10 .57 <.10

R 09/17/01 1300 <.10 <.10 <.10

04193500 Maumee River at Waterville, Ohio R 08/30/01 0900 .12 .46 <.10

LD 08/30/01 0900 <.10 .66 <.10

R 09/19/01 0730 <.10 <.10 <.10

Las Vegas Valley, Carson and Truckee Basins Surface Water (NVB)

094196783 Las Vegas Wash below Flamingo Wash 

confluence near Las Vegas, Nevada

R 10/09/02 0930 .75 .62 <.10

R 10/24/02 0930 .68 .23 <.10

R 11/14/02 0930 .48 .37 <.10

R 11/26/02 0830 .52 .25 <.10

LD 11/26/02 0830 .55 .23 <.10

R 12/16/02 1030 <.10 .30 <.10

R 12/30/02 1000 <.10 .18 <.10

FB 01/15/03 0940 <.10 <.10 <.10

FR 01/15/03 0950 <.10 <.10 <.10

R 01/15/03 1000 <.10 .14 <.10

R 01/28/03 0945 <.10 <.10 <.10

FR 01/28/03 0950 <.10 <.10 <.10

LD 01/28/03 0950 <.10 <.10 <.10

R 02/10/03 1000 <.10 .14 <.10

LD 02/10/03 1000 <.10 .15 <.10

R 02/24/03 0830 <.10 .33 <.10

LD 02/24/03 0830 <.10 .25 <.10

FB 03/12/03 0845 <.10 <.10 <.10

R 03/12/03 0850 .34 .40 <.10

LD 03/12/03 0850 .34 .42 <.10

58  Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Las Vegas Valley, Carson and Truckee Basins Surface Water (NVB)—Continued

094196783 Las Vegas Wash below Flamingo Wash 

confluence near Las Vegas, Nevada—Continued

FR 03/12/03 0855 0.34 0.42 <0.10

R 03/13/03 1000 .59 .26 <.10

LD 03/13/03 1000 .551 .24 <.10

R 03/26/03 0945 .79 .26 <.10

LD 03/26/03 0945 .79 .26 <.10

R 04/10/03 0930 .60 .22 <.10

R 04/28/03 1000 <.10 .64 <.10

R 05/21/03 0930 .35 .30 <.10

LD 05/21/03 0930 .28 .28 <.10

R 07/02/03 0830 .79 <.10 <.10

R 08/13/03 0800 2.0 .93 <.10

R 09/09/03 0900 .46 .88 <.10

Long Island and New Jersey Coastal Drainages (LIG)

393946074582901 NU–10 R 08/31/05 1600 <.02 <.02 <.02

394018074590801 NU–09 R 08/18/05 1445 <.02 <.02 <.02

394145074591301 NU–22 R 09/20/05 1430 <.02 <.02 <.02

394153075011101 NU–23 R 08/18/05 1200 <.02 <.02 <.02

394233074574401 NU–16 R 09/21/05 1200 <.02 <.02 <.02

394243075034401 NU–25 R 08/22/05 1115 <.02 <.02 <.02

394254074590501 NU–19 R 08/17/05 1400 <.02 <.02 <.02

394258075061101 NU–18 R 08/30/05 1200 <.02 <.02 <.02

FR 08/30/05 1201 <.02 <.02 <.02

394300074532701 NU–15 R 08/31/05 1035 <.02 <.02 <.02

FR 08/31/05 1230 <.02 <.02 <.02

394323075063701 NU–17 R 08/25/05 1045 <.02 <.02 <.02

FR 08/25/05 1150 <.02 <.02 <.02

394325075045801 NU–01 R 08/23/05 1600 <.02 <.02 <.02

LD 08/23/05 1600 <.02 <.02 <.02

Data Tables  59
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Long Island and New Jersey Coastal Drainages (LIG)—Continued

394340075012701 NU–08 R 08/17/05 1100 <0.02 <0.02 <0.02

394342075040301 NU–02 R 08/23/05 1300 <.02 <.02 <.02

394348074595301 NU–13 R 08/16/05 1530 <.02 <.02 <.02

394428075044601 NU–03 R 08/23/05 1050 <.02 <.02 <.02

394446075031001 NU–29 R 08/22/05 1400 <.02 <.02 <.02

394457075040001 NU–04 R 08/24/05 1115 <.02 <.02 <.02

FR 08/24/05 1120 <.02 <.02 <.02

394504075051001 NU–05 R 08/24/05 1350 <.02 <.02 <.02

394507075023801 NU–30 R 08/25/05 1530 <.02 <.02 <.02

394528075004301 NU–06 R 08/16/05 1130 <.02 <.02 <.02

394604075003601 NU–11 R 09/20/05 1120 <.02 <.02 <.02

394606074591801 NU–07 R 08/15/05 1440 <.02 .18 <.02

394657074554501 NU–26 R 08/11/05 1500 <.02 .16 <.02

394736074564201 NU–12 R 08/15/05 1145 <.02 .13 <.02

394934074550801 NU–27 R 08/11/05 1200 .03 .20 <.02

R 09/01/05 1415 <.02 <.02 <.02

395007074562501 NU–14 R 08/10/05 1400 <.02 .28 <.02

395116074562901 NU–21 R 09/21/05 1545 <.02 <.02 <.02

400000074000094 Equipment blank FB 06/21/05 1120 <.02 <.02 <.02

FB 06/21/05 1335 <.02 <.02 <.02

Lower Illinois River Basin Ground Water (ILG)

383214089571501 1N8W14–3.f1 SIL–25 Whiteside Elementary 

School

R 08/03/05 1400 <.02 <.02 <.02

383321089594601 1N8W9–6.h1 SIL–23 Wolf Branch Middle School R 08/03/05 1000 <.02 <.02 <.02

383445089535701 2N7W32–3.e1 SIL–27 Evans Elementary School R 08/01/05 1300 <.02 <.02 <.02

FR 08/01/05 1305 <.02 <.02 <.02

383453089545001 2N7W31–2.g1 SIL–27A O’Fallon Public Library R 08/04/05 0900 <.02 <.02 <.02

FR 08/04/05 0901 <.02 <.02 <.02

383847090003501 2N8W5–3.b1 R 07/12/05 1100 <.02 <.02 <.02

384058090010601 3N9W29–7.f1 R 07/12/05 1500 <.02 <.02 <.02

60 Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Lower Illinois River Basin Ground Water (ILG)—Continued

384323090405801 46N3E22–8.b2 SMO–12 Ozark Way R 08/09/05 0900 <0.02 <0.02 <0.02

384411090354601 46N4E17–3.a1 SMO–14 / Ramona Lane R 07/27/05 1000 <.02 <.02 <.02

384422090420701 46N3E17–1.b1 SMO–02 Sports Park R 08/09/05 1400 <.02 <.02 <.02

LD 08/09/05 1400 .06 <.02 <.02

384504090394701 46N3E10–1.a1 SMO–10 / Strehl Fields R 07/27/05 1500 <.02 <.02 <.02

384515089591801 4N8W33–2.f1 SIL–28 / Olivia Lane R 08/08/05 1500 <.02 <.02 <.02

384546089575801 4N8W27–1.b1 SIL–21 Public Works Garage R 08/02/05 0900 <.02 .16 <.02

384613089572001 4N8W26–4.f1 SIL–30 South Station Road R 08/02/05 1300 <.02 <.02 <.02

LD 08/02/05 1300 <.02 <.02 <.02

384619090382701 46N3E2–7.d1 SMO–08 Woodlands Sports Park R 07/26/05 0900 <.02 <.02 <.02

FR 07/26/05 0901 <.02 <.02 <.02

384629090350901 46N4E4–8.f1 XMO–17A Covenent Park R 08/10/05 1500 <.02 <.02 <.02

384634090430201 46N3E5–8.f1 SMO–05 Stoney Brook Drive R 07/25/05 1400 <.02 <.02 <.02

384635090355101 46N4E5–5.g1 SMO–18 Oak Creek Park R 08/10/05 0900 <.02 .35 <.02

384646090375501 47N3E36–3.a1 SMO–09A Rabbit Run Park R 07/26/05 1400 <.02 <.02 <.02

FR 07/26/05 1405 <.02 <.02 <.02

384656089582001 4N8W22–3.e1 R 07/13/05 1000 <.02 <.02 <.02

384659090003701 4N8W20–4.e1 R 07/14/05 0900 <.02 <.02 <.02

384714089585301 4N8W22-7.g1 R 07/13/05 1500 <.02 <.02 <.02

384734090384801 47N3E35.2.h1 R 07/28/05 0900 <.02 <.02 <.02

384955089473001 5N6W32–4.a1 MRN–1 R 09/07/05 1100 <.02 <.02 <.02

385446090015901 5N8W6–5.b1 R 07/11/05 1400 <.02 <.02 <.02

385735089513901 6N7W22–5.g1 WDN–1 R 09/07/05 1500 <.02 <.02 <.02

R 09/07/05 1500 <.02 <.02 <.02

Mississippi Embayment Surface Water (RCM)

07288650 Bogue Phalia near Leland, Mississippi R 10/13/04 1115 .59 1.1 <.02

R 11/03/04 1130 .35 1.8 <.02

R 12/07/04 1035 .28 1.1 <.02

Data Tables 61
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Mississippi Embayment Surface Water (RCM)—Continued

07288650 Bogue Phalia near Leland, Mississippi—

Continued

FB 01/04/05 0855 <0.02 <0.02 <0.02

R 01/04/05 1015 .12 1.5 <.02

FB 02/08/05 0830 <.02 <.02 <.02

LD 02/08/05 0830 <.02 <.02 <.02

R 02/08/05 0930 .59 1.8 <.02

R 02/22/05 0800 .4 1.2 <.02

R 03/07/05 1110 .38 1.7 <.02

R 03/21/05 0910 .11 <.02 <.02

R 03/22/05 1110 2.4 1.5 <.02

R 03/28/05 1135 1.0 2.6 <.02

R 04/04/05 1139 .17 2.4 <.02

LD 04/04/05 1139 .17 1.9 <.02

FR 04/04/05 1140 .22 2.1 <.02

R 04/20/05 1010 .38 3.3 .56

R 05/02/05 1010 .85 1.5 <.02

R 05/26/05 1100 .4 1.9 <.02

R 05/31/05 1100 1.3 2.8 <.02

FB 06/07/05 1100 <.02 <.02 <.02

R 06/07/05 1100 1.1 3.9 <.02

FB 06/20/05 1100 <.02 <.02 <.02

R 06/20/05 1100 1.8 8.7 <.02

R 07/05/05 1000 1.7 5.0 <.02

R 07/20/05 1200 1.1 3.9 <.02

LD 07/20/05 1200 1.5 4.6 <.02

R 08/08/05 1200 1.8 4.9 <.02

R 08/09/05 0900 2.3 4.1 <.02

62 Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Mississippi Embayment Surface Water (RCM)—Continued

07288650 Bogue Phalia near Leland, Mississippi—

Continued

R 08/23/05 1000 1.4 6.7 <0.02

R 08/24/05 1100 .84 4.1 <.02

R 09/06/05 1000 .53 1.7 <.02

07288955 Yazoo River below Steele Bayou near Long Lake R 10/14/04 1200 .13 .79 <.02

R 11/04/04 1300 .13 .48 <.02

R 12/08/04 1310 .12 .41 <.02

R 02/10/05 1400 .13 .61 <.02

R 02/24/05 1100 <.02 .23 <.02

R 03/14/05 1200 .17 .43 <.02

R 03/23/05 1145 .12 .26 <.02

R 04/07/05 1145 <.02 .45 <.02

FR 04/07/05 1146 <.02 .51 <.02

R 04/21/05 1200 .38 .29 <.02

R 05/24/05 1205 .24 .77 <.02

R 06/09/05 1200 <.02 .61 <.02

R 06/22/05 1000 .08 .52 <.02

R 07/07/05 1100 <.02 .73 <.02

R 07/25/05 1200 .13 1.1 <.02

R 08/10/05 1100 .19 .8 <.02

R 09/07/05 1130 .13 .95 <.02

FB 05/04/05 1000 <.02 <.02 <.02

R 05/04/05 1020 .09 .44 <.02

LD 05/04/05 1020 .18 .39 <.02

332440090502101 FO135 Bogue Phalia—right bank FB 09/15/05 1030 <.02 <.02 <.02

LD 09/15/05 1030 <.02 <.02 <.02

332440090502103 FO137 Bogue Phalia—left bank FB 09/15/05 1045 <.02 <.02 <.02

332541090503301 FO005 Washington R 09/21/05 1400 <.02 <.02 <.02

Data Tables 63
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Mississippi Embayment Surface Water (RCM)—Continued

335910090532901 C0028 Bolivar R 09/20/05 1600 <0.02 <0.02 <0.02

Potomac River Basin Surface Water (POD)

01493500 Morgan Creek near Kennedyville, Maryland R 11/14/02 1000 <.10 <.10 <.10

LD 11/14/02 1000 <.10 <.10 <.10

R 10/23/02 1100 <.10 <.10 <.10

R 01/07/03 1100 <.10 <.10 <.10

R 02/05/03 1130 <.10 <.10 <.10

R 03/06/03 1130 <.10 <.10 <.10

FR 03/06/03 1200 <.10 <.10 <.10

R 03/18/03 1100 <.10 <.10 <.10

R 04/07/03 1000 <.10 <.10 <.10

LD 04/07/03 1000 <.10 <.10 <.10

R 05/08/03 1300 <.10 <.10 <.10

R 05/09/03 2145 <.10 <.10 <.10

R 05/15/03 1000 <.10 <.10 <.10

R 05/22/03 1000 <.10 <.10 <.10

LD 05/22/03 1000 <.10 <.10 <.10

R 06/04/03 1200 <.10 <.10 <.10

R 06/17/03 1000 <.10 <.10 <.10

FR 06/17/03 1005 <.10 .14 <.10

LD 06/17/03 1005 <.10 .13 <.10

FB 07/17/03 1030 <.10 <.10 <.10

LD 07/17/03 1030 <.10 <.10 <.10

R 07/17/03 1100 <.10 .16 <.10

R 07/31/03 1100 <.10 .13 <.10

LD 07/31/03 1100 <.10 .13 <.10

FR 07/31/03 1130 <.10 <.10 <.10

64  Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Potomac River Basin Surface Water (POD)—Continued

01493500 Morgan Creek near Kennedyville, Maryland—

Continued

R 08/14/03 1000 <0.10 0.21 <0.10

FB 08/14/03 0930 <.10 <.10 <.10

LD 08/14/03 0930 <.10 <.10 <.10

R 09/05/03 1000 <.10 .32 <.10

R 09/30/03 1100 <.10 .11 <.10

R 12/13/02 1030 <.10 <.10 <.10

R 04/21/03 0930 <.10 <.10 <.10

Puget Sound Basin Surface Water (PUB)

12128000 Thornton Creek near Seattle, Washington R 10/13/04 1330 .06 .14 <.02

R 10/13/04 1338 <.02 <.02 <.02

FR 10/13/04 1339 <.02 <.02 <.02

R 11/10/04 1230 .05 .15 <.02

LD 11/10/04 1230 .10 .11 <.02

R 12/14/04 1340 .07 .15 <.02

R 01/12/05 1310 <.02 .17 <.02

R 02/09/05 1220 <.02 .11 <.02

R 03/09/05 1210 <.02 <.02 <.02

R 03/22/05 1150 <.02 <.02 <.02

R 04/12/05 1210 <.02 <.02 <.02

R 04/28/05 1210 <.02 <.02 <.02

R 05/12/05 1210 .14 .08 <.02

R 05/24/05 1240 .08 <.02 <.02

FR 05/24/05 1241 .06 .07 <.02

R 06/01/05 1200 .53 .12 <.02

R 06/08/05 1200 .18 <.02 <.02

R 06/15/05 1330 .08 .11 <.02

R 06/21/05 0950 .05 .11 <.02

LD 06/21/05 0950 .05 .10 <.02

Data Tables 65
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Puget Sound Basin Surface Water (PUB)—Continued

12128000 Thornton Creek near Seattle, Washington—

Continued

R 06/28/05 0930 0.07 0.09 <0.02

LD 06/28/05 0930 .06 <.02 <.02

R 07/13/05 1000 <.02 .07 <.02

FR 07/13/05 1008 <.02 <.02 <.02

R 07/20/05 1150 <.02 .07 <.02

LD 07/20/05 1150 .02 .07 <.02

R 07/25/05 1050 .03 .11 <.02

R 08/10/05 1140 <.02 .20 <.02

R 08/16/05 1140 <.02 .09 <.02

R 08/23/05 1130 <.02 <.02 <.02

R 09/06/05 1230 .45 .33 <.02

R 09/20/05 1200 .09 .18 <.02

Puget Sound Basin Ground Water (PUG) 

465958122481001 UR–05 R 08/08/05 1100 <.02 <.02 <.02

470005122502301 UR–11 R 08/10/05 1320 .03 .31 <.02

470035122444601 UR–12 R 08/11/05 1120 <.02 .21 <.02

470035122444601 UR–12 LD 08/11/05 1120 <.02 .19 <.02

470035122444601 UR–12 FR 08/11/05 1121 <.02 .13 <.02

470040122463601 UR–1 R 08/04/05 1158 <.02 <.02 <.02

470040122463601 UR–1 R 08/12/05 1200 <.02 <.02 <.02

470040122463601 UR–1 FR 08/12/05 1208 <.02 <.02 <.02

470045122463801 -- R 07/07/05 1310 <.02 <.02 <.02

470046122522301 UR–08 R 08/09/05 1530 <.02 <.02 <.02

470110122484201 -- R 07/07/05 1040 <.02 <.02 <.02

470110122484201 -- LD 07/07/05 1040 <.02 <.02 <.02

470112122493501 UR–07 R 08/09/05 1200 <.02 <.02 <.02

470112122493501 UR–07 FR 08/09/05 1208 <.02 <.02 <.02

470135122202501 UR–21 R 08/03/05 1420 <.02 <.02 <.02

66 Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Puget Sound Basin Ground Water (PUG)—Continued

470135122514001 UR–06 R 08/08/05 1420 <0.02 <0.02 <0.02

470208122223501 UR–37 R 08/05/05 1130 <.02 <.02 <.02

470228122441701 UR–10 R 08/10/05 1040 <.02 .31 <.02

470230122203001 UR–25 R 08/02/05 1340 <.02 <.02 <.02

470240122214501 UR–24 R 08/03/05 1120 <.02 <.02 <.02

470306122450301 UR–14 R 08/11/05 1400 <.02 .14 <.02

470328122215501 UR–23 R 07/29/05 0900 <.02 <.02 <.02

470330122181501 UR–31 R 08/02/05 1030 <.02 <.02 <.02

470343122504501 UR–09 R 08/04/05 1510 <.02 <.02 <.02

470603122300501 LC149C R 08/01/05 1500 <.02 <.02 <.02

470644122160801 UR–30 R 07/27/05 1040 <.02 <.02 <.02

470705122230501 UR–26 R 07/28/05 0940 <.02 <.02 <.02

470720122162101 UR–29B R 08/26/05 1230 <.02 <.02 <.02

470720122162101 UR–29B FR 08/26/05 1231 <.02 <.02 <.02

470720122162101 UR–29B LD 08/26/05 1231 <.02 <.02 <.02

470732122252801 UR–32 R 07/28/05 1310 <.02 <.02 <.02

470958122154301 UR–34 R 07/26/05 1250 <.02 <.02 <.02

471018122143302 UR–35B R 07/26/05 1000 <.02 <.02 <.02

471018122143302 UR–35B LD 07/26/05 1000 <.02 <.02 <.02

471133122335501 -- R 07/25/05 1220 <.02 <.02 <.02

471133122335501 -- LD 07/25/05 1220 <.02 <.02 <.02

Sacramento Basin Ground Water (SCG)

383000121313601 8N/4E–34K1 R 07/12/05 1000 <.02 <.02 <.02

382941121320501 8N/3E–3D1 R 07/12/05 1230 <.02 <.02 <.02

382906121322201 7N/3E–4J1 (Charter Pointe) R 07/20/05 1000 .02 <.02 <.02

382911121312301 7N/4E–3K2 R 07/20/05 1330 <.02 <.02 <.02

382757121261101 7N/5E–16C1 Hite R 08/02/05 0930 <.02 <.02 <.02

382800121270701 7N/5E–17B1 Mesa Grande R 08/02/05 1130 <.02 <.02 <.02

Data Tables 67
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Sacramento Basin Ground Water (SCG)—Continued

382800121270701 7N/5E–17B1 Mesa Grande LD 08/02/05 1130 <0.02 <0.02 <0.02

FR 08/02/05 1131 <.02 <.02 <.02

382537121260001 7N/5E–28Q1 Case R 08/03/05 0940 <.02 <.02 <.02

382515121262501 7N/5E–33D1 Pedersen R 08/03/05 1120 <.02 <.02 <.02

382517121252601 7N/5E–34D1 Laguna Strip 4 R 08/03/05 1310 <.02 <.02 <.02

382629121254801 7N/5E–21R1 North Laguna Creek R 08/04/05 0940 <.02 <.02 <.02

382450121253601 7N/5E–33J1 Lichtenberger R 08/04/05 1200 <.02 <.02 <.02

FR 08/04/05 1205 <.02 <.02 <.02

383655121230161 9N/4E–23R2 (Bannon Creek) R 08/16/05 0940 <.02 <.02 <.02

383746121291101 9N/4E–13R1 (Chuckwagon) R 08/16/05 1120 <.02 <.02 <.02

FR 08/16/05 1121 <.02 <.02 <.02

383727121301801 9N/4E–23A1 (Jefferson) R 08/17/05 0930 <.02 <.02 <.02

383659121292201 9N/4E-24Q1 (Northgate) R 08/17/05 1120 <.02 <.02 <.02

LD 08/17/05 1120 <.02 <.02 <.02

FR 08/17/05 1125 <.02 <.02 <.02

384303121211701 10N/6E–18R1 Antelope Community R 09/21/05 1000 <.02 <.02 <.02

LD 09/21/05 1000 <.02 <.02 <.02

384145121184101 10N/6E–27F1 R 09/21/05 1220 <.02 <.02 <.02

San Joaquin-Tulare Basins Surface Water (SAN)

11273500 Merced River at River Road Bridge near Newman, 

California

R 10/15/02 1220 <.10 <.10 <.10

R 11/07/02 1230 <.10 <.10 <.10

R 12/12/02 1230 <.10 <.10 <.10

FR 12/12/02 1231 <.10 <.10 <.10

LD 12/12/02 1231 <.10 <.10 <.10

R 01/09/03 1200 <.10 <.10 <.10

R 01/23/03 1140 <.10 <.10 <.10

R 02/06/03 1300 <.10 <.10 <.10

R 02/20/03 1220 <.10 <.10 <.10

R 03/12/03 1340 <.10 <.10 <.10

68  Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

San Joaquin-Tulare Basins Surface Water (SAN)

11273500 Merced River at River Road Bridge near Newman, 

California—Continued

FR 03/12/03 1348 <0.10 <0.10 <0.10

R 03/28/03 1320 <.10 <.10 <.10

R 04/09/03 1330 <.10 <.10 <.10

R 04/29/03 1450 <.10 <.10 <.10

R 05/14/03 1500 <.10 <.10 <.10

R 05/28/03 1250 <.10 <.10 <.10

R 06/11/03 1340 <.10 <.10 <.10

R 06/25/03 1350 <.10 <.10 <.10

LD 06/25/03 1350 <.10 <.10 <.10

FR 06/25/03 1351 <.10 <.10 <.10

R 07/10/03 1340 <.10 <.10 <.10

R 07/24/03 1250 <.10 <.10 <.10

R 08/07/03 1340 .18 .22 <.10

R 09/04/03 1130 <.10 <.10 <.10

11274538 Orestimba Creek at River Road near Crows 

Landing, California

R 10/15/02 1150 <.10 .53 <.10

R 11/07/02 1130 .19 .24 <.10

R 02/06/03 1220 .22 .23 <.10

R 02/20/03 1150 .20 .60 <.10

R 03/12/03 1300 7.5 .69 <.10

LD 03/12/03 1300 6.8 1.0 <.10

R 03/12/03 1301 7.7 .83 <.10

FR 03/12/03 1308 <.10 <.10 <.10

LD 03/12/03 1308 <.10 <.10 <.10

R 03/28/03 1240 3.0 .61 <.10

LD 03/28/03 1240 3.1 .61 <.10

R 04/09/03 1250 1.3 .65 <.10

R 04/29/03 1420 .63 .59 <.10

Data Tables 69
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

San Joaquin-Tulare Basins Surface Water (SAN)—Continued

11274538 Orestimba Creek at River Road near Crows 

Landing, California—Continued

R 05/14/03 1420 1.2 0.58 <0.10

R 05/14/03 1428 <.10 <.10 <.10

R 05/28/03 1220 .10 .32 <.10

R 06/11/03 1300 .34 .50 <.10

R 06/25/03 1320 .45 .68 <.10

R 07/10/03 1310 .32 .41 <.10

LD 07/10/03 1310 .22 .45 <.10

R 07/24/03 1200 .38 1.1 <.10

LD 07/24/03 1200 .36 1.0 <.10

R 08/07/03 1300 .83 .66 <.10

R 09/04/03 1050 .35 .50 <.10

11303500 San Joaquin River near Vernalis, California R 10/15/02 1020 <.10 .28 <.10

R 12/11/02 1140 <.10 .13 <.10

FR 12/11/02 1141 <.10 .11 <.10

R 01/24/03 1050 <.10 .21 <.10

R 02/06/03 1420 <.10 .17 <.10

R 02/19/03 1130 <.10 .27 <.10

R 03/11/03 1240 .16 .36 <.10

R 03/11/03 1248 <.10 <.10 <.10

R 03/27/03 1300 <.10 .24 <.10

R 04/08/03 1300 <.10 .20 <.10

R 04/29/03 1300 <.10 .12 <.10

R 05/13/03 1330 <.10 .19 <.10

R 05/28/03 1100 <.10 .15 <.10

R 06/10/03 1400 <.10 .21 <.10

R 06/24/03 1220 <.10 .20 <.10

70 Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

San Joaquin-Tulare Basins Surface Water (SAN)—Continued

11303500 San Joaquin River near Vernalis, California—

Continued

R 07/09/03 1330 0.18 0.22 <0.10

R 07/23/03 1210 <.10 .48 <.10

R 08/06/03 1400 <.10 .56 <.10

R 09/03/03 1130 .24 .31 <.10

R 11/08/02 1130 .13 .14 <.10

LD 11/08/02 1130 .17 .16 <.10

R 01/08/03 1230 <.10 .15 <.10

LD 01/08/03 1230 <.10 .10 <.10

San Joaquin-Tulare Basins Ground Water (SAG)

355750119185101 23S/25E–6 R 08/07/02 1010 <.10 <.10 <.10

360310119201901 021S024E36N002M R 07/24/02 1000 <.10 <.10 <.10

360310119201901 021S024E36N002M FR 07/24/02 1005 <.10 <.10 <.10

360710119145301 21S/25E–10 R 07/30/02 1350 <.10 <.10 <.10

360719119205501 21S/24E–11 R 07/29/02 1420 <.10 <.10 <.10

360807119114901 21S/26E–06 R 07/30/02 1000 <.10 <.10 <.10

361338119275501 019S023E34P002M R 08/08/02 1000 <.10 <.10 <.10

361338119275501 019S023E34P002M LD 08/08/02 1000 <.10 <.10 <.10

361341119280102 019S023E34P004M R 06/18/02 1500 <.10 <.10 <.10

361519119433401 019S021E19R001M R 07/25/02 0950 <.10 <.10 <.10

361717119234202 019S024E08L002M R 06/18/02 1040 <.10 <.10 <.10

361726119241101 019S024E07J001M R 07/23/02 1330 <.10 <.10 <.10

361852119350601 018S022E33R001M R 07/31/02 1000 <.10 <.10 <.10

361852119350601 018S022E33R001M LD 07/31/02 1000 <.10 <.10 <.10

361948119412201 018S021E27N003M R 07/26/02 1010 <.10 <.10 <.10

362417119533701 017S019E34Q002M R 07/17/02 1050 <.10 <.10 <.10

362525119450601 017S020E25K001M R 07/16/02 1220 <.10 <.10 <.10

362525119450601 017S020E25K001M FR 07/16/02 1225 <.10 <.10 <.10

362537119450902 017S020E25G002M R 06/19/02 1240 <.10 <.10 <.10

363123119585001 016S018E23K001M R 07/17/02 1540 <.10 <.10 <.10

Data Tables  71
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

San Joaquin-Tulare Basins Ground Water (SAG)—Continued

363924119530401 015S019E03G001M R 07/15/02 1620 <0.10 <0.10 <0.10

370046120212001 010S015E32P001M R 07/18/02 1100 <.10 <.10 <.10

370618120190101 009S015E34K001M R 07/18/02 1530 <.10 <.10 <.10

371548120224101 008S015E06M001M R 07/11/02 1230 <.10 <.10 <.10

371548120224101 008S015E06M001M LD 07/11/02 1230 <.10 <.10 <.10

372323120554401 006S009E25B001M R 08/06/02 1130 <.10 <.10 <.10

372617120530301 006S010E04M001M R 07/11/02 1000 <.10 <.10 <.10

372624120530302 006S010E04M003M R 07/22/02 1150 <.10 <.10 <.10

372933120565901 005S009E23C002M R 07/10/02 1320 <.10 <.10 <.10

373114120595001 005S009E08A001M R 07/09/02 1200 <.10 <.10 <.10

373349121032302 004S008E26B002M R 06/20/02 1220 <.10 <.10 <.10

373351121032301 004S008E26B003M R 07/08/02 1330 <.10 <.10 <.10

373700121071001 4S/8E–5E1 R 08/29/02 0920 <.10 <.10 <.10

374043121100301 003S007E14B001M R 07/10/02 1040 <.10 <.10 <.10

374902121031101 001S008E–26 R 09/12/02 1030 <.10 <.10 <.10

South Platte Basin Surface Water (SPL)

06713500 Cherry Creek at Denver, Colorado R 10/09/02 0959 <.10 <.10 <.10

LD 10/09/02 0959 <.10 <.10 <.10

FR 10/09/02 1000 <.10 <.10 <.10

R 10/09/02 1020 <.10 .30 <.10

R 11/05/02 1010 <.10 .88 <.10

R 12/03/02 0945 <.10 .27 <.10

R 01/08/03 1010 <.10 .16 <.10

LD 01/08/03 1010 <.10 .15 <.10

FR 01/08/03 1011 <.10 .20 <.10

R 02/04/03 0940 <.10 .33 <.10

R 03/05/03 1030 <.10 .23 <.10

R 04/10/03 1010 <.10 <.10 <.10

R 04/22/03 1000 <.10 <.10 <.10

72 Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

South Platte Basin Surface Water (SPL)—Continued

06713500 Cherry Creek at Denver, Colorado—Continued FR 04/22/03 1020 <0.10 0.12 <0.10

R 05/07/03 1000 <.10 .15 <.10

R 05/20/03 1020 <.10 .14 <.10

FR 05/20/03 1021 <.10 .17 <.10

R 06/02/03 0845 .78 .49 <.10

LD 06/02/03 0845 .80 .56 <.10

R 06/23/03 0900 .25 .31 <.10

LD 06/23/03 0900 .25 .35 <.10

R 07/08/03 1000 <.10 .14 <.10

R 08/05/03 1110 .43 .37 <.10

R 08/15/03 1030 .30 .49 <.10

R 09/11/03 1030 <.10 .29 <.10

R 09/22/03 1030 <.10 .14 <.10

Trinity River Basin Ground Water (TRG)

294503095373201 MW29 R 12/14/03 0958 <.10 <.10 <.10

LD 12/14/03 0958 <.10 <.10 <.10

FR 12/14/03 1001 <.10 <.10 <.10

294620095440501 MW17 R 12/15/03 1001 <.10 <.10 <.10

294405095412301 REF01 R 12/15/03 1401 <.10 <.10 <.10

294957095310801 MW26 R 12/12/03 1101 <.10 <.10 <.10

FR 12/12/03 1103 <.10 <.10 <.10

294919095320501 MW25 R 12/13/03 0931 <.10 <.10 <.10

294807095452701 MW27 R 12/13/03 1401 <.10 <.10 <.10

294800095415801 MW28A R 12/21/03 1701 <.10 <.10 <.10

295049095253101 MW23 R 12/10/03 1001 <.10 <.10 <.10

LD 12/10/03 1001 <.10 <.10 <.10

295133095273201 MW22 R 12/11/03 1001 <.10 <.10 <.10

295150095302401 MW20 R 12/12/03 1358 <.10 <.10 <.10

Data Tables  73
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Trinity River Basin Ground Water (TRG)—Continued

295150095302401 MW20 FR 12/12/03 1401 <0.10 <0.10 <0.10

295232095294101 MW21 R 12/11/03 1401 <.10 <.10 <.10

295249095411301 MW16 R 12/16/03 1101 <.10 <.10 <.10

295358095374101 MW18 R 12/18/03 1101 <.10 <.10 <.10

295421095305801 MW19 R 12/19/03 1001 <.10 <.10 <.10

295557095360901 MW11 R 12/16/03 1401 <.10 <.10 <.10

295633095335201 MW12 R 12/17/03 1101 <.10 <.10 <.10

295711095222301 MW07 R 12/17/03 1101 <.10 <.10 <.10

LD 12/17/03 1101 <.10 <.10 <.10

295720095290001 MW08 R 12/17/03 1601 <.10 <.10 <.10

300011095251801 MW10 R 12/17/03 1601 <.10 <.10 <.10

300026095225401 MW06 R 12/19/03 1001 <.10 <.10 <.10

300036095400101 REF02 R 12/29/03 1101 <.10 <.10 <.10

300044095312001 MW01 R 12/19/03 1501 <.10 <.10 <.10

300155095200201 MW05 R 12/20/03 1101 <.10 <.10 <.10

FR 12/20/03 1103 <.10 <.10 <.10

300333095291701 MW03 R 12/29/03 1701 <.10 <.10 <.10

300351095232601 MW02 R 12/18/03 1201 <.10 <.10 <.10

300825095274801 MW14 R 12/30/03 1701 <.10 <.10 <.10

301008095302901 MW13 R 12/22/03 1801 <.10 <.10 <.10

LD 12/22/03 1801 <.10 <.10 <.10

301220095305501 MW15 R 12/22/03 1101 <.10 <.10 <.10

LD 12/22/03 1101 <.10 <.10 <.10

301716095400501 REF03 R 12/30/03 1001 <.10 <.10 <.10

Upper Snake River Basin Ground Water (USG)

423723113495801 09S 22E 23DAD1 R 06/21/05 0732 <.02 <.02 <.02

423805113465501 09S 23E 16CCC1 R 06/21/05 1000 <.02 <.02 <.02

423857113493301 09S 22E 12 CDC1 R 06/21/05 1200 <.02 <.02 <.02

423934113430001 09S 23E 12BAB1 R 06/21/05 1330 <.02 <.02 <.02

424226113454901 08S 23E 21DDD1 R 06/22/05 0800 <.02 <.02 <.02

74  Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Upper Snake River Basin Ground Water (USG)—Continued

424159113432801 08S 23E 26 ADD2 R 06/22/05 1000 <0.02 <0.02 <0.02

424133113432401 08S 23E 25CCC1 R 06/22/05 1130 <.02 <.02 <.02

424355113503201 08S 22E 14ABCC1 R 06/23/05 0800 <.02 <.02 <.02

424352113235601 08S 26E 15ABD1 R 06/27/05 1200 <.02 <.02 <.02

424421113293201 08S 25E 11DAD1 R 06/27/05 1400 <.02 <.02 <.02

424448113332501 08S 25E 8ABA1 R 06/28/05 0800 <.02 <.02 <.02

424544113303201 08S 25E 2BBB1 R 06/28/05 1000 <.02 <.02 <.02

424333113363301 08S 24E 14DAD1 R 06/28/05 1200 <.02 <.02 <.02

424629113385201 07S 24E 33ADA1 R 06/29/05 0800 <.02 <.02 <.02

424550113400301 08S 24E 05AAA2 R 06/29/05 0930 <.02 <.02 <.02

424647113444201 07S 23E 27DDD1 R 06/29/05 1200 <.02 <.02 <.02

424227113381301 08S 24E 22DCC1 R 06/30/05 0730 <.02 <.02 <.02

424041113392501 08S 24E 33DCC1 R 06/30/05 1000 <.02 <.02 <.02

424220113362701 08S 24E 25BBB1 R 06/30/05 1200 <.02 <.02 <.02

FR 06/30/05 1208 <.02 <.02 <.02

FR 06/30/05 1210 <.02 <.02 <.02

424629113385201 07S 24E 33ADA1 R 06/29/05 0800 <.02 <.02 <.02

424448113332501 08S 25E 8ABA1 R 06/28/05 0800 <.02 <.02 <.02

424220113362701 08S 24E 25BBB1 R 06/30/05 1210 <.02 <.02 <.02

424617113421901 07S 23E 36DAA1 R 07/20/05 1000 <.02 <.02 <.02

424407113412001 08S 24E 18AAA1 R 07/20/05 1230 <.02 <.02 <.02

424555113463901 07S 23E 33CDC1 R 07/20/05 1600 <.02 <.02 <.02

424146113402201 08S 24E 29DBD1 R 07/21/05 0930 <.02 <.02 <.02

424609113312001 07S 25E 34CAD1 R 07/21/05 1230 <.02 <.02 <.02

424251113443401 08S 23E 23BCC1 R 07/21/05 1500 <.02 <.02 <.02

423857113473301 09S 23E 08CDD1 R 07/25/05 1200 <.02 0.02 <.02

423857113532701 09S 22E 09CCC1 R 07/25/05 1445 <.02 <.02 <.02

423806113543701 09S 22E 17CCC1 R 07/25/05 1700 <.02 <.02 <.02

Data Tables  75
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Upper Snake River Basin Ground Water (USG)—Continued

424317113485101 08S 22E 13DDC1 R 07/26/05 1015 <0.02 <0.02 <0.02

423948113522201 09S 22E 04DDD1 R 07/26/05 1200 <.02 <.02 <.02

423948113522201 09S 22E 04DDD1 FR 07/26/05 1208 <.02 <.02 <.02

423948113522201 09S 22E 04DDD1 FR 07/26/05 1212 <.02 <.02 <.02

424132113322102 8S 25E 28 DCC2 R 08/31/05 1645 <.02 <.02 <.02

White River Basin Surface Water (WHM) 

03267900 Mad River at St. Paris Pike at Eagle City, Ohio R 10/02/02 1100 <.10 <.10 <.10

R 11/06/02 1030 <.10 <.10 <.10

R 12/04/02 1130 <.10 <.10 <.10

R 12/05/02 1330 <.10 <.10 <.10

R 12/17/02 1300 <.10 <.10 <.10

R 02/12/03 1130 <.10 <.10 <.10

R 03/13/03 1115 <.10 <.10 <.10

R 04/08/03 1300 <.10 <.10 <.10

R 04/22/03 1200 <.10 <.10 <.10

R 05/13/03 1200 <.10 <.10 <.10

R 05/28/03 1330 <.10 .11 <.10

R 06/11/03 1345 <.10 <.10 <.10

R 06/25/03 1200 <.10 <.10 <.10

R 07/08/03 1016 .50 .94 <.10

FB 07/08/03 1015 <.10 <.10 <.10

LD 07/08/03 1015 <.10 <.10 <.10

R 07/30/03 1100 <.10 <.10 <.10

R 08/06/03 1114 <.10 <.10 <.10

R 08/06/03 1115 <.10 .22 <.10

R 08/26/03 1045 <.10 <.10 <.10

LD 08/26/03 1045 <.10 <.10 <.10

76 Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

White River Basin Surface Water (WHM)—Continued

03267900 Mad River at St. Paris Pike at Eagle City, 

Ohio—Continued

R 09/04/03 1130 <0.10 0.13 <0.10

R 01/22/03 1115 <.10 .13 <.10

03353637 Little Buck Creek near Indianapolis, Indiana R 10/08/02 1130 <.10 .31 <.10

R 11/06/02 1230 <.10 <.10 <.10

R 11/27/02 1330 <.10 <.10 <.10

R 12/09/02 1230 <.10 <.10 <.10

R 01/15/03 1110 <.10 <.10 <.10

R 02/13/03 1130 <.10 <.10 <.10

R 03/17/03 1040 .12 <.10 <.10

R 04/09/03 1150 <.10 <.10 <.10

R 04/22/03 1210 <.10 <.10 <.10

LD 04/22/03 1210 <.10 <.10 <.10

R 05/05/03 1120 .21 <.10 <.10

R 05/20/03 1040 <.10 <.10 <.10

R 06/02/03 1328 <.10 <.10 <.10

FR 06/02/03 1329 <.10 <.10 <.10

FB 06/02/03 1330 <.10 <.10 <.10

R 06/25/03 1110 <.10 <.10 <.10

R 07/08/03 1040 <.10 .18 <.10

R 07/21/03 1210 1.1 .41 <.10

FR 07/21/03 1211 .73 .49 <.10

R 08/05/03 1258 <.10 <.10 <.10

R 08/05/03 1300 .35 .35 .11

R 09/02/03 1130 .16 .10 <.10

03374100 White River at Hazelton, Indiana R 10/15/02 1500 <.10 .60 <.10

R 11/12/02 1340 <.10 .14 <.10

Data Tables  77
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

White River Basin Surface Water (WHM)—Continued

03374100 White River at Hazelton, Indiana—Continued R 11/26/02 1430 <0.10 0.11 <0.10

R 12/19/02 1410 <.10 .11 <.10

R 01/23/03 1340 <.10 .11 <.10

R 02/20/03 1400 <.10 <.10 <.10

R 03/13/03 1430 <.10 .13 <.10

R 04/03/03 1520 <.10 <.10 <.10

R 04/17/03 1430 <.10 .11 <.10

R 05/01/03 1350 <.10 .19 <.10

R 05/22/03 1310 <.10 <.10 <.10

R 06/05/03 1350 <.10 .15 <.10

R 06/26/03 1430 <.10 .17 <.10

R 07/10/03 1330 <.10 .32 <.10

R 07/23/03 1358 <.10 <.10 <.10

FR 07/23/03 1400 .11 .49 <.10

FR 07/23/03 1401 .12 .58 <.10

R 08/06/03 1330 <.10 .32 <.10

R 08/20/03 1330 <.10 .28 <.10

R 09/04/03 1330 <.10 .21 <.10

393944084120700 Holes Creek at Huffman Park at Kettering, Ohio R 10/04/02 1445 <.10 .32 <.10

R 11/06/02 1330 <.10 <.10 <.10

R 12/18/02 1130 <.10 <.10 <.10

R 01/23/03 1230 <.10 <.10 <.10

R 02/13/03 1230 <.10 <.10 <.10

R 03/11/03 1100 <.10 <.10 <.10

LD 03/11/03 1100 <.10 <.10 <.10

R 04/09/03 1230 <.10 <.10 <.10

R 04/23/03 1130 <.10 <.10 <.10

78  Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

White River Basin Surface Water (WHM)—Continued

393944084120700 Holes Creek at Huffman Park at Kettering, 

Ohio—Continued

R 05/28/03 1130 0.23 <0.10 <0.10

R 06/11/03 1100 .67 .25 <.10

R 06/26/03 1200 <.10 <.10 <.10

FR 06/26/03 1201 <.10 <.10 <.10

R 07/10/03 1200 <.10 .19 <.10

FR 07/10/03 1201 <.10 <.10 <.10

R 07/31/03 1230 <.10 .14 <.10

R 08/05/03 1229 <.10 <.10 <.10

FR 08/05/03 1230 <.10 .27 <.10

R 08/27/03 1315 1.2 .15 <.10

R 09/03/03 1130 .36 .24 <.10

LD 09/03/03 1130 .30 .31 <.10

R 05/14/03 1100 <.10 .10 <.10

394340085524601 Sugar Creek at County Road 400 South, New 

Palestine, Indiana

R 10/09/02 1310 <.10 .38 <.10

R 11/05/02 1330 <.10 <.10 <.10

R 11/25/02 1330 <.10 <.10 <.10

R 12/16/02 1100 <.10 <.10 <.10

R 01/16/03 1100 <.10 <.10 <.10

R 02/18/03 1130 <.10 <.10 <.10

R 03/11/03 1200 <.10 .26 <.10

R 04/01/03 1140 <.10 <.10 <.10

R 04/15/03 1130 <.10 <.10 <.10

R 05/06/03 1340 .18 .11 <.10

R 05/06/03 1341 .16 .13 <.10

R 05/21/03 1100 <.10 <.10 <.10

LD 05/21/03 1100 <.10 <.10 <.10

Data Tables  79
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

White River Basin Surface Water (WHM) —Continued

394340085524601 Sugar Creek at County Road 400 South, New 

Palestine, Indiana—Continued

R 06/04/03 1400 <0.10 <0.10 <0.10

R 06/24/03 1300 <.10 <.10 <.10

R 07/09/03 1040 .81 .54 <.10

R 07/22/03 1358 <.10 <.10 <.10

R 07/22/03 1400 .24 .43 <.10

R 08/04/03 1320 .13 .22 <.10

LD 08/04/03 1320 .15 .21 <.10

R 08/19/03 1150 <.10 .24 <.10

R 09/03/03 1240 .46 .54 <.10

03353637 Little Buck Creek near Indianapolis, Indianapolis R 09/02/03 1130 .14 .11 <.10

White River Basin Ground Water (WHG) 

393119086154101 Well TP23 R 09/10/02 1130 <.10 <.10 <.10

LD 09/10/02 1130 <.10 <.10 <.10

393223085534001 Well TP7 R 08/07/02 1200 <.10 <.10 <.10

393230085375302 Well TP2 reset R 09/09/02 1500 <.10 <.10 <.10

393405086322001 Well TP20 R 09/10/02 1600 <.10 <.10 <.10

393433085320301 Well TP6 R 08/22/02 1600 <.10 <.10 <.10

FR 08/22/02 1605 <.10 <.10 <.10

394032085543101 Well TP17 R 08/06/02 1200 <.10 <.10 <.10

FR 08/06/02 1201 <.10 <.10 <.10

394157085430401 Well TP1 R 08/09/02 1030 <.10 <.10 <.10

394226085275601 Well TP22 R 08/07/02 1600 <.10 <.10 <.10

394516086555601 Well TP15 R 08/13/02 1200 <.10 <.10 <.10

LD 08/13/02 1200 <.10 <.10 <.10

394849086273001 Well TP21 R 09/03/02 1700 <.10 <.10 <.10

LD 09/03/02 1700 <.10 <.10 <.10

395159086171501 Well TPREF1 R 09/06/02 1100 <.10 <.10 <.10

80 Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

White River Basin Ground Water (WHG)—Continued

395253086314001 Well TP4 R 08/08/02 1305 <0.10 <0.10 <0.10

R 09/04/02 1030 <.10 <.10 <.10

395633085460801 Well TP5 R 08/19/02 1500 <.10 <.10 <.10

FR 08/19/02 1501 <.10 <.10 <.10

395656086191601 Well TP25 R 08/21/02 1100 <.10 <.10 <.10

395713085202901 Well TP8 R 08/23/02 1300 <.10 <.10 <.10

LD 08/23/02 1300 <.10 <.10 <.10

400356085562101 Well TP18 R 08/15/02 1300 <.10 <.10 <.10

400401085044701 Well TP11 R 09/05/02 1630 <.10 <.10 <.10

400713086132801 Well TP3 R 09/04/02 1500 <.10 <.10 <.10

400717085032801 Well TP10 reset R 09/11/02 1130 <.10 <.10 <.10

400746084551101 Well TP24 R 09/05/02 1300 <.10 <.10 <.10

400836085205901 WellTP9 reset R 09/11/02 1600 <.10 <.10 <.10

400844086095201 Well TP16 R 09/04/02 1800 <.10 <.10 <.10

401945085321501 Well TP14 R 08/20/02 1600 <.10 <.10 <.10

LD 08/20/02 1600 <.10 <.10 <.10

401952085460101 Well TP13 R 08/20/02 1200 <.10 <.10 <.10

Willamette Basin Surface Water (WIL)

14201300 Zollner Creek near Mount Angel, Oregon R 10/16/02 1220 .59 4.0 <.10

LD 10/16/02 1220 .65 3.4 <.10

R 10/16/02 1228 <.10 .28 <.10

R 10/30/02 1100 .29 1.3 <.10

LD 10/30/02 1100 .74 1.2 <.10

R 11/06/02 1110 .25 1.1 <.10

R 11/20/02 1130 .21 .90 <.10

R 12/04/02 1200 .14 .95 <.10

R 12/19/02 1020 <.10 .16 <.10

LD 12/19/02 1020 <.10 .15 <.10

Data Tables  81
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Willamette Basin Surface Water (WIL)—Continued

14201300 Zollner Creek near Mount Angel, Oregon—

Continued

R 01/09/03 1050 <0.10 <0.10 <0.10

R 02/10/03 1140 .17 .10 <.10

FR 02/10/03 1141 .12 .14 <.10

R 03/03/03 1240 .78 .45 <.10

LD 03/03/03 1240 .77 .41 <.10

R 04/01/03 1120 .17 .16 <.10

FB 04/01/03 1129 <.10 <.10 <.10

R 04/16/03 1420 .86 .26 <.10

R 04/30/03 1350 .46 .22 <.10

R 05/14/03 1150 .44 .15 <.10

R 06/03/03 1120 .21 .52 <.10

R 06/25/03 1140 .16 1.7 <.10

R 07/09/03 1210 <.10 .66 <.10

R 08/13/03 1150 .40 4.5 <.10

R 09/03/03 1320 <.10 1.5 <.10

Willamette Basin Ground Water (WIG)

441155123152801 Well 65 R 07/08/02 1700 <.10 <.10 <.10

441556123092001 Well 63 R 07/09/02 1400 <.10 <.10 <.10

441719123033101 Well 64 R 07/10/02 1500 <.10 <.10 <.10

442208123080501 Well 60 R 08/20/02 1700 <.10 <.10 <.10

442252122592201 Well 61 R 07/10/02 1700 <.10 <.10 <.10

442642123091201 Well 58 R 08/20/02 1400 <.10 <.10 <.10

443226123121701 Well 54 R 07/08/02 1600 <.10 <.10 <.10

443437123133901 Well 49 R 07/08/02 1300 <.10 <.10 <.10

FR 07/08/02 1301 <.10 <.10 <.10

LD 07/08/02 1301 <.10 <.10 <.10

443646122552701 Well 51 R 06/28/02 1300 <.10 <.10 <.10

FR 06/28/02 1308 <.10 <.10 <.10

444055123035401 Well 46 R 07/11/02 1700 <.10 <.10 <.10

82 Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 5. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in National Water-Quality Assessment (NAWQA) Program 

surface- and ground-water studies, 2001–06.—Continued

[Location of NAWQA study units shown in figure 4. Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less 

than; μg/L, micrograms per liter]

Site 

number Site location Sample type

Date of 

collection 

(day/

month/

year)

Collection 

time 

(24- 

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Willamette Basin Ground Water (WIG)—Continued

444055123035401 Well 46 LD 07/11/02 1700 <0.10 <0.10 <0.10

444128122520901 Well 47 R 06/27/02 1300 <.10 <.10 <.10

444213122481301 Well 48 R 07/11/02 1300 <.10 <.10 <.10

444807123140101 Well 41 R 08/21/02 1600 <.10 <.10 <.10

444915122493801 Well 44 R 06/27/02 1600 <.10 <.10 <.10

444955123105901 Well 40 R 08/21/02 1300 <.10 <.10 <.10

450122122470301 Well 35 R 08/22/02 1700 <.10 <.10 <.10

FR 08/22/02 1708 <.10 <.10 <.10

450745123015801 Well 29 R 07/12/02 1600 <.10 <.10 <.10

450808122440101 Well 31 R 06/25/02 1200 <.10 <.10 <.10

450910123113701 Well 28 R 07/12/02 1300 <.10 <.10 <.10

450921122361201 Well 32 R 06/24/02 1600 <.10 <.10 <.10

FR 06/24/02 1601 <.10 <.10 <.10

451048122420501 Well 25 R 06/25/02 1700 <.10 <.10 <.10

451250122364001 Well 26 R 06/24/02 1300 <.10 <.10 <.10

451340123043401 Well 22 R 08/22/02 1300 <.10 <.10 <.10

451708122204801 Well 20 R 06/10/02 1300 <.10 <.10 <.10

LD 06/10/02 1300 <.10 <.10 <.10

451711122563401 Well 16 R 06/11/02 1200 <.10 <.10 <.10

LD 06/11/02 1200 <.10 <.10 <.10

452222122145301 Well 15 R 08/19/02 1700 <.10 <.10 <.10

452335122320801 Well 12 R 08/19/02 1300 <.10 <.10 <.10

452842122305801 Well 08 R 05/28/02 1500 <.10 <.10 <.10

LD 05/28/02 1500 <.10 <.10 <.10

453417122572901 Well 02 R 06/26/02 1300 <.10 <.10 <.10

Data Tables  83
Table 6. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in Toxic Substances Hydrology Program studies, 2001–06. 

[Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/day/

year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Reconnaissance data for glyphosate in nine Midwestern States

Illinois

03378000 Bonpas Creek at Browns R 06/06/02 1030 <0.10 0.33 <0.10

FR 06/06/02 1031 <.10 .26 <.10

R 06/25/02 1300 4.5 .91 <.10

R 09/25/02 1015 .44 .55 <.10

03381495 Little Wabash River at Main Street at Carmi R 06/06/02 1230 <.10 <.10 <.10

R 06/25/02 1430 1.4 .83 <.10

FR 06/25/02 1431 2.3 .91 <.10

R 09/25/02 0830 .34 .80 <.10

05439500 South Branch Kishwaukee River near Fairdale R 05/14/02 1600 .33 .19 <.10

R 08/02/02 1430 <.10 .26 <.10

R 09/25/02 0930 <.10 .28 <.10

05526000 Iroquois River near Chebanse R 06/06/02 0925 <.10 <.10 <.10

R 06/28/02 0910 .19 .29 <.10

LD 06/28/02 0910 .25 .18 <.10

R 09/25/02 1345 <.10 .21 <.10

05540500 Dupage River at Shorewood R 05/15/02 1030 <.10 .10 <.10

R 06/27/02 1240 .34 .44 <.10

R 09/25/02 1145 <.10 .89 <.10

05569500 Spoon River at London Mills R 05/14/02 1035 .19 .23 <.10

R 07/30/02 1000 <.10 .24 <.10

R 09/24/02 0905 <.10 .10 <.10

05576500 Sangamon River at Riverton R 05/29/02 1015 .36 .16 <.10

R 07/17/02 1515 <.10 .61 <.10

LD 07/17/02 1515 <.10 .74 <.10

R 09/25/02 0845 <.10 1.8 <.10

LD 09/25/02 0845 <.10 1.7 <.10

05587000 Macoupin Creek near Kane R 06/06/02 1000 <.10 <.10 <.10

84  Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 6. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in Toxic Substances Hydrology Program studies, 2001–06.—

Continued

[Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/day/

year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Reconnaissance data for glyphosate in nine Midwestern States—Continued

Illinois—Continued

05587000 Macoupin Creek near Kane—Continued R 07/29/02 1115 0.13 0.39 <0.10

R 09/24/02 1120 <.10 .51 <.10

05592100 Kaskaskia River near Cowden R 05/29/02 0930 .20 .17 <.10

R 06/25/02 1200 <.10 .27 <.10

R 09/25/02 1330 <.10 .21 <.10

05594000 Shoal Creek near Breese R 06/06/02 1330 <.10 .22 <.10

R 07/29/02 1410 .17 .22 <.10

R 09/24/02 1420 .14 .23 <.10

Indiana

03275000 Whitewater River near Alpine FB 06/14/02 1145 <.10 <.10 <.10

R 06/14/02 1230 1.0 .43 <.10

R 06/28/02 1205 .34 .28 <.10

R 10/29/02 1715 <.10 .17 <.10

03302800 Blue River at Fredericksburg R 06/06/02 1130 .34 .28 <.10

R 08/21/02 1130 <.10 <.10 <.10

R 09/27/02 1200 .26 .36 <.10

03328500 Eel River near Logansport R 06/05/02 1200 <.10 <.10 <.10

R 07/30/02 1130 <.10 .18 <.10

R 07/31/02 1250 <.10 .31 <.10

R 12/10/02 1000 <.10 <.10 <.10

03333450 Wildcat Creek near Jerome R 05/30/02 1250 .16 .12 <.10

R 08/19/02 1110 <.10 .13 <.10

R 09/20/02 1316 <.10 .10 <.10

LD 09/20/02 1316 <.10 .10 <.10

03335000 Wildcat Creek near Lafayette R 05/30/02 1630 .19 .23 <.10

R 07/23/02 1000 <.10 .36 <.10

R 11/12/02 1215 <.10 .79 <.10

Data Tables  85
Table 6. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in Toxic Substances Hydrology Program studies, 2001–06.—

Continued

[Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/day/

year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Reconnaissance data for glyphosate in nine Midwestern States—Continued

Indiana—Continued

03362500 Sugar Creek near Edinburgh R 06/07/02 1345 0.45 0.34 <0.10

R 06/26/02 1020 1.5 .38 <.10

R 06/26/02 1120 1.0 .51 <.10

FR 06/26/02 1121 .58 .33 <.10

R 10/26/02 1340 .30 .62 <.10

03371500 East Fork White River near Bedford R 06/06/02 1600 .23 .22 <.10

R 07/23/02 1605 <.10 .37 <.10

LD 07/23/02 1605 <.10 .42 <.10

R 10/01/02 1140 .13 .34 <.10

FR 10/01/02 1141 .20 .33 <.10

Iowa

05411850 Turkey River near Eldorado R 05/14/02 1400 <.10 <.10 <.10

FR 05/14/02 1405 <.10 <.10 <.10

R 06/24/02 0950 <.10 <.10 <.10

R 10/29/02 1300 <.10 <.10 <.10

05421000 Wapsipinicon River at Independence R 05/14/02 1100 <.10 <.10 <.10

R 06/24/02 1245 <.10 <.10 <.10

R 10/29/2002 0930 <.10 <.10 <.10

05455100 Old Mans Creek near Iowa City R 05/13/02 1100 <.10 <.10 <.10

R 06/27/02 0955 .46 .26 <.10

R 10/30/02 1140 <.10 .13 <.10

05472500 North Skunk River near Sigourney R 05/13/02 1630 <.10 <.10 <.10

R 07/08/02 1015 <.10 .18 <.10

R 10/29/2002 1435 <.10 <.10 <.10

05474000 Skunk River at Augusta R 05/13/02 1230 <.10 <.10 <.10

R 06/27/02 1235 .36 .26 <.10

R 10/29/2002 1015 <.10 .11 <.10

86 Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 6. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in Toxic Substances Hydrology Program studies, 2001–06.—

Continued

[Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/day/

year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Reconnaissance data for glyphosate in nine Midwestern States—Continued

Iowa—Continued

05480500 Des Moines River at Fort Dodge R 05/17/02 1230 <0.10 <0.10 <0.10

R 06/13/02 0730 <.10 .19 <.10

R 10/30/02 1500 <.10 .10 <.10

05484500 Racoon River at Van Meter R 05/17/02 0930 <.10 <.10 <.10

R 06/12/02 1630 <.10 .17 <.10

FR 06/12/02 1635 .27 .25 <.10

R 10/30/02 1200 <.10 <.10 <.10

06606600 Little Sioux River at Correctionville R 05/17/02 1615 <.10 <.10 <.10

R 06/11/02 1100 <.10 .27 <.10

R 10/31/02 0930 <.10 .13 <.10

06607200 Maple River at Mapleton R 05/29/02 1200 <.10 <.10 <.10

LD 05/29/02 1200 <.10 <.10 <.10

R 06/11/02 1330 .36 .64 .14

R 10/31/02 1200 <.10 .42 <.10

06609500 Boyer River at Logan R 05/29/02 0945 <.10 .33 <.10

R 06/11/02 1545 .32 .45 <.10

R 11/01/02 0900 .12 .20 <.10

Kansas

06885500 Black Vermillion near Frankfort R 05/07/02 1145 <.10 <.10 <.10

LD 05/07/02 1145 <.10 <.10 <.10

R 05/07/02 1150 <.10 <.10 <.10

R 08/17/02 1235 <.10 .11 <.10

R 10/03/02 1135 8.7 3.6 <.10

06890100 Delaware River near Muscotah R 05/07/02 1315 <.10 <.10 <.10

R 06/27/02 0950 1.7 .41 .26

LD 06/27/02 0950 1.6 .63 .27

R 09/19/02 1110 <.10 <.10 <.10

Data Tables  87
Table 6. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in Toxic Substances Hydrology Program studies, 2001–06.—

Continued

[Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/day/

year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Reconnaissance data for glyphosate in nine Midwestern States—Continued

Minnesota

05317000 Cottonwood River near New Ulm R 05/30/02 1350 <0.10 <0.10 <0.10

R 06/25/02 1620 .77 .42 <.10

R 10/04/02 0935 <.10 <.10 <.10

05320270 Little Cobb River near Beauford R 06/06/02 1315 <.10 <.10 <.10

R 06/27/02 1045 .30 .15 <.10

R 10/02/02 1105 <.10 <.10 <.10

05476000 Des Moines River at Jackson R 05/31/02 0720 <.10 <.10 <.10

R 06/25/02 1215 <.10 <.10 <.10

FR 06/25/02 1220 <.10 <.10 <.10

R 10/08/02 1145 <.10 <.10 <.10

Missouri

06817700 Nodaway River near Graham R 05/14/02 1230 <.10 <.10 <.10

LD 05/14/02 1230 <.10 <.10 <.10

R 07/29/02 1200 <.10 .36 <.10

R 10/04/02 1215 <.10 .25 <.10

Nebraska

06804000 Wahoo Creek at Ithaca R 05/13/02 1330 <.10 .19 <.10

R 06/12/02 0840 <.10 .38 <.10

R 10/04/02 0930 <.10 .65 <.10

06815000 Big Nemaha River at Falls City R 05/06/02 1400 <.10 <.10 <.10

LD 05/06/02 1400 <.10 <.10 <.10

R 07/12/02 1400 <.10 .19 <.10

R 10/04/02 1520 <.10 .34 <.10

06880800 West Fork Big Blue River near Dorchester R 05/07/02 0900 .11 1.3 <.10

R 07/26/02 1100 .17 2.0 <.10

R 10/04/02 0920 .21 1.3 <.10

06882000 Big Blue River at Barneston R 05/07/02 1530 .31 1.3 <.10

R 06/15/02 0900 .21 1.8 <.10

88  Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 6. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in Toxic Substances Hydrology Program studies, 2001–06.—

Continued

[Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/day/

year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Reconnaissance data for glyphosate in nine Midwestern States—Continued

Nebraska—Continued

06882000 Big Blue River at Barneston—Continued R 10/04/02 1300 0.54 1.3 <0.10

R 10/04/02 1310 .36 1.2 <.10

R 10/04/02 1310 .46 1.5 <.10

06884000 Little Blue River near Fairbury R 05/07/02 1230 <.10 .42 <.10

R 06/13/02 0930 .52 .64 <.10

R 10/02/02 2000 .33 .71 <.10

Ohio

03157000 Clear Creek near Rockbridge R 06/05/02 1115 .27 .23 <.10

R 07/29/02 1200 <.10 <.10 <.10

R 10/26/02 1300 <.10 <.10 <.10

03219500 Scioto River near Prospect R 06/04/02 1230 .58 .55 <.10

LD 06/04/02 1230 .59 .51 <.10

FR 06/04/02 1231 .65 .67 <.10

R 07/31/02 0930 .48 .82 <.10

R 10/01/02 1030 .28 .47 <.10

03223000 Olentangy River at Claridon R 06/04/02 1100 .24 .27 <.10

R 07/31/02 1100 <.10 .34 <.10

R 10/26/02 1500 <.10 .13 <.10

03230500 Big Darby Creek at Darbyville R 06/03/02 1200 .60 .31 <.10

R 08/01/02 0930 <.10 .25 <.10

LD 08/01/02 0930 <.10 .32 <.10

R 10/01/02 1105 .25 .34 <.10

03234500 Scioto River at Higby R 06/04/02 1015 .24 .36 <.10

R 07/30/02 1100 .23 .94 <.10

R 10/28/02 1000 .28 .89 <.10

LD 10/28/02 1000 .29 .99 <.10

03240000 Little Miami River near Oldtown R 06/05/02 1320 <.10 <.10 <.10

Data Tables  89
Table 6. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in Toxic Substances Hydrology Program studies, 2001–06.—

Continued

[Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/day/

year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Reconnaissance data for glyphosate in nine Midwestern States—Continued

Ohio—Continued

03240000 Little Miami River near Oldtown—Continued R 07/17/02 1200 <0.10 <0.10 <0.10

R 10/27/2002 0700 .45 .17 <.10

032667900 Mad River at St. Paris Pike at Eagle City R 06/05/02 1130 <.10 .11 <.10

R 07/17/02 1030 <.10 <.10 <.10

FR 07/17/02 1031 <.10 <.10 <.10

R 10/27/2002 0800 <.10 <.10 <.10

04185000 Tiffin River at Stryker R 05/29/02 1700 .16 <.10 <.10

R 07/23/02 1530 <.10 .26 <.10

R 11/06/02 1200 <.10 <.10 <.10

FR 11/06/02 1201 <.10 <.10 <.10

04186500 Auglaize River near Fort Jennings R 05/28/02 1115 <.10 .28 <.10

R 07/23/02 1100 .17 .58 <.10

R 10/30/02 1300 <.10 .30 <.10

Wisconsin

04087240 Root River at Racine R 06/03/02 1350 <.10 .10 <.10

FR 06/03/02 1351 <.10 .18 <.10

R 07/26/02 1130 <.10 .29 <.10

LD 07/26/02 1130 <.10 .23 <.10

R 09/03/02 1110 .12 .35 <.10

05340500 St. Croix River at St Croix Falls R 06/20/02 1130 <.10 <.10 <.10

R 06/27/02 1130 <.10 <.10 <.10

LD 06/27/02 1130 <.10 <.10 <.10

R 09/03/02 1520 <.10 <.10 <.10

LD 09/03/02 1520 <.10 <.10 <.10

05407000 Wisconsin River at Muscoda R 05/28/02 1330 <.10 <.10 <.10

R 06/27/02 1215 <.10 <.10 <.10

R 09/23/02 1130 <.10 <.10 <.10

90 Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 6. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in Toxic Substances Hydrology Program studies, 2001–06.—

Continued

[Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/day/

year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Reconnaissance data for glyphosate in nine Midwestern States—Continued

Wisconsin—Continued

05430500 Rock River at Afton R 06/04/02 1300 <0.10 0.16 <0.10

R 07/11/02 1229 <.10 .33 <.10

FB 07/11/02 1230 <.10 <.10 <.10

R 09/20/02 0945 <.10 .41 <.10

Mississippi River glyphosate study, 2001–03

07374000 Mississippi River at Baton Rouge, Louisiana R 10/31/01 1300 <.10 .18 <.10

R 11/14/01 1300 <.10 .18 <.10

R 11/28/01 1200 <.10 .23 <.10

R 12/10/01 1300 <.10 .14 <.10

LD 12/10/01 1300 <.10 .11 <.10

R 01/03/02 1140 <.10 .15 <.10

LD 01/03/02 1140 <.10 .10 <.10

R 01/17/02 1100 <.10 .12 <.10

LD 01/17/02 1100 <.10 .13 <.10

R 02/04/02 1300 <.10 .15 <.10

LD 02/04/02 1300 <.10 .14 <.10

R 02/28/02 1230 <.10 .15 <.10

LD 02/28/02 1230 <.10 .18 <.10

R 03/11/02 1300 <.10 .24 <.10

R 03/28/02 1300 <.10 .38 <.10

R 04/12/02 1115 <.10 <.10 <.10

R 05/02/02 1300 <.10 <.10 <.10

R 05/15/02 1300 <.10 .12 <.10

R 06/05/02 1200 <.10 .16 <.10

R 06/11/02 1030 <.10 .16 <.10

R 07/02/02 1130 <.10 .17 <.10

R 07/25/02 1400 <.10 .21 <.10

R 08/21/02 1100 <.10 .21 <.10

R 09/17/02 1400 <.10 .27 <.10

LD 09/17/02 1400 <.10 .22 <.10

Data Tables  91
Table 6. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in Toxic Substances Hydrology Program studies, 2001–06.—

Continued

[Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/day/

year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Mississippi River glyphosate study, 2001–03—Continued

07374000 Mississippi River at Baton Rouge, Louisiana—

Continued

R 10/16/02 1500 <0.10 0.24 <0.10

R 11/19/02 1400 <.10 .12 <.10

LD 11/19/02 1400 <.10 .13 <.10

R 12/18/02 1330 <.10 .10 <.10

R 01/15/03 1400 <.10 <.10 <.10

R 02/20/03 1330 <.10 .12 <.10

LD 02/20/03 1330 <.10 .17 <.10

R 03/13/03 1200 <.10 .11 <.10

R 04/03/03 1100 <.10 .20 <.10

R 05/19/03 1330 <.10 .18 <.10

LD 05/19/03 1330 <.10 .20 <.10

R 06/03/03 1230 <.10 .19 <.10

R 06/19/03 0830 <.10 .20 <.10

R 07/03/03 1330 <.10 <.10 <.10

R 07/15/03 1230 <.10 .31 <.10

R 07/30/03 1130 <.10 .31 <.10

R 09/17/03 1400 <.10 .30 <.10

R 09/29/03 1300 <.10 .33 <.10

R 10/15/03 1430 <.10 .27 <.10

LD 10/15/03 1430 <.10 .31 <.10

Sensitive environments study, 2004–06 

District of Columbia

C&O1 Carderock Vernal Pool R 03/08/06 1230 <.02 <.02 <.02

LD 03/08/06 1230 <.02 <.02 <.02

R 04/05/06 1245 <.02 <.02 <.02

C&O2 Lock 7 Vernal Pool R 03/08/06 1300 <.02 <.02 <.02

R 04/05/06 1330 <.02 <.02 <.02

C&O3 C&O Canal at Lock 7 R 03/08/06 1330 <.02 <.02 <.02

R 04/05/06 1345 .06 <.02 <.02

92 Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 6. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in Toxic Substances Hydrology Program studies, 2001–06.—

Continued

[Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/day/

year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Sensitive environments study, 2004–06—Continued

District of Columbia—Continued

C&O3 C&O Canal at Lock 7—Continued FR 04/05/06 1450 <0.02 <0.02 <0.02

RC1 Weir Pond at RCNP R 03/14/05 1000 <.02 <.02 <.02

R 03/24/05 0900 <.02 <.02 <.02

R 03/08/06 1615 <.02 <.02 <.02

R 04/05/06 1500 <.02 <.02 <.02

RC3 Riley Spring Pond at RCNP R 03/14/05 1100 <.02 <.02 <.02

LD 03/14/05 1100 <.02 <.02 <.02

R 03/24/05 1030 328 15 <.02

FR 03/24/05 1031 301 41 <.02

RC4 Rock Creek at Riley Spring Pond R 03/14/05 1200 1.1 .21 <.02

R 03/24/05 1100 .60 <.02 <.02

R 03/08/06 1530 <.02 .09 <.02

R 04/05/06 1520 .12 .12 <.02

Iowa

DS1 Fieldside Wetlands at DNWR R 04/13/05 1115 <.02 <.02 <.02

LD 04/13/05 1115 <.02 <.02 <.02

R 06/08/05 1200 12 3.2 <.02

DS2 Rands Ditch at DNWR R 04/13/05 1130 .05 .09 <.02

R 06/08/05 1110 .12 .18 <.02

LD 06/08/05 1110 .10 .17 <.02

R 05/24/06 0840 1.5 2.9 <.02

LD 05/24/06 0840 1.4 2.9 <.02

DS3 Browns Ditch at DNWR R 04/13/05 1145 <.02 1.0 <.02

R 06/08/05 1225 .56 .75 <.02

R 05/24/06 0920 <.02 <.02 <.02

DS4 Browns Pond at DNWR R 04/13/05 1200 .05 <.02 <.02

R 06/08/05 1230 .09 <.02 <.02

Data Tables  93
Table 6. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in Toxic Substances Hydrology Program studies, 2001–06.—

Continued

[Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/day/

year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Sensitive environments study, 2004–06—Continued

Iowa—Continued

DS5 East Bend Pond at DNWR R 06/08/05 1145 <0.02 <0.02 <0.02

Michigan

WYMO-10 Lake RSL near Saginaw R 08/12/05 1000 .04 <.02 <.02

LD 08/12/05 1000 <.02 <.02 <.02

Nebraska

06880000 Lincoln Creek near Seward R 07/09/04 1310 1.4 1.5 <.02

R 08/05/04 1100 .26 .97 <.02

TH1080 Creek at Field 413 R 07/09/04 1125 21 5.8 <.02

R 08/05/04 1430 <.02 .03 <.02

R 08/06/04 1100 <.02 .02 <.02

TH1090 Pond at Field 413 R 07/09/04 1200 .08 .21 <.02

R 08/05/04 1400 1.2 1.2 <.02

WYMI112 Frenchman Creek near Champion R 08/05/04 1045 <.02 <.02 <.02

WYMI113 Pond near Champion R 08/12/04 0845 1.1 .02 <.02

WYMI114 Rock Creek near Parks R 08/12/04 0857 <.02 <.02 <.02

WYMI19 Pond near Republican River near Stratton R 07/21/04 2130 .25 .12 <.02

WYMI33 Pond near Republican River near Franklin R 07/22/04 2040 <.02 .08 <.02

WYMI46 Elkhorn River near Nickerson R 07/25/04 2015 .16 .51 <.02

New York

WYMO-09 Lake Champlain near Plattsburg R 08/10/05 0800 .07 .29 <.02

South Dakota

WYMI104 North Fork Rapid Creek near Silver City R 08/04/04 1945 <.02 <.02 <.02

LD 08/04/04 1945 <.02 <.02 <.02

WYMI67 North Bend Creek R 07/29/04 1416 <.02 <.02 <.02

WYMI83 Big Sioux River near Egan R 07/31/04 2149 <.02 <.02 <.02

WYMI91 Buffalo Lakes near Lake City R 08/01/04 1005 <.02 <.02 <.02

WYMI98 Dry House Creek near Buffalo R 08/02/04 1401 <.02 .04 <.02

94  Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 6. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in Toxic Substances Hydrology Program studies, 2001–06.—

Continued

[Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/day/

year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Sensitive environments study, 2004–06—Continued

Vermont

WYMO-06 Lake Champlain near Swanton R 08/10/05 1200 0.04 <0.02 <0.02

WYMO-08 Lake Champlain near Addison R 08/10/05 1600 <.02 .06 <.02

LD 08/10/05 1600 <.02 <.02 <.02

Wyoming

TH1010 Pond at Dugway Campground, Wyoming R 07/13/04 0800 .02 .27 <.02

R 07/18/04 0748 <.02 <.02 <.02

R 08/16/04 1115 <.02 <.02 <.02

R 04/19/05 0745 <.02 <.02 <.02

LD 04/19/05 0745 <.02 <.02 <.02

R 05/05/05 1525 <.02 <.02 <.02

LD 05/05/05 1525 .02 <.02 <.02

R 05/24/05 0950 .06 <.02 <.02

R 05/31/05 1545 .02 <.02 <.02

R 07/15/05 0815 <.02 <.02 <.02

R 07/27/05 0800 .08 .06 <.02

R 08/09/05 0800 .06 .04 <.02

R 08/15/05 0945 <.02 <.02 <.02

R 04/21/06 0915 <.02 <.02 <.02

R 06/26/06 1020 <.02 <.02 <.02

TH1020 North Platte above Seminoe Reservation R 07/13/04 0745 .04 .66 <.02

R 07/18/04 0925 <.02 <.02 <.02

R 08/16/04 1330 <.02 <.02 .05

R 04/19/05 0830 <.02 <.02 <.02

R 05/05/05 1505 <.02 <.02 <.02

R 05/24/05 1040 <.02 <.02 <.02

R 05/31/05 1530 <.02 <.02 <.02

R 07/15/05 0745 <.02 <.02 <.02

R 08/09/05 1000 .07 .05 <.02

R 08/15/05 1100 <.02 <.02 <.02

Data Tables  95
Table 6. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in Toxic Substances Hydrology Program studies, 2001–06.—

Continued

[Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/day/

year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Sensitive environments study, 2004–06—Continued

Wyoming—Continued

TH1020 North Platte above Seminoe Reservation—Continued R 04/21/06 0930 <0.02 <0.02 <0.02

R 06/26/06 1000 <.02 <.02 <.02

Leary Weber Ditch Basin, Indiana (ground water) 

395023085492802 ACTTR1–1–B piezometer at Mohawk R 06/29/04 1015 <.02 .04 <.02

395023085492804 ACTTR1–1–D piezometer at Mohawk FR 06/29/04 1045 <.02 .04 <.02

R 10/25/04 1230 .05 .10 <.02

395023085492810 ACTTR1–1–2 piezometer at Mohawk R 06/28/04 1600 <.02 .07 <.02

R 10/25/04 1300 .12 .22 <.02

395023085492811 ACTTR1–1–2–C piezometer at Mohawk R 06/28/04 1645 <.02 .05 <.02

395023085492812 ACTTR1–1–2–D piezometer at Mohawk R 10/25/04 1330 .17 .22 <.02

395023085492814 ACTTR1–1–3–B piezometer at Mohawk R 06/29/04 1400 <.02 .08 <.02

R 10/25/04 1430 .27 .33 <.02

395023085492816 ACTTR1–1–3–D piezometer at Mohawk R 06/29/04 1230 <.02 .08 <.02

R 10/25/04 1500 .12 .17 <.02

395023085492822 ACTTR1–1–4–A piezometer at Mohawk R 06/28/04 1230 <.02 .08 <.02

R 10/25/04 1600 .02 .10 <.02

395023085492824 ACTTR1–1–4–C piezometer at Mohawk R 06/28/04 1500 <.02 .07 <.02

R 10/25/04 1200 <.02 .35 <.02

R 10/25/04 1630 <.02 <.02 <.02

FR 10/25/04 1631 <.02 <.02 <.02

395023085492840 ACTTR1–3–1–B piezometer at Mohawk R 06/29/04 1530 <.02 .04 <.02

R 10/22/04 1300 <.02 <.02 <.02

395023085492842 ACTTR1–3–1–D piezometer at Mohawk R 06/29/04 1615 <.02 .06 <.02

R 10/22/04 1330 <.02 <.02 <.02

395023085492844 ACTTR1–3–2–B piezometer at Mohawk R 06/29/04 1745 <.02 .07 <.02

R 06/30/04 1015 <.02 .06 <.02

R 10/22/04 1100 <.02 <.02 <.02

R 10/22/04 1400 <.02 .15 <.02

96 Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 6. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in Toxic Substances Hydrology Program studies, 2001–06.—

Continued

[Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/day/

year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Sensitive environments study, 2004–06—Continued

Leary Weber Ditch Basin, Indiana (ground water)—Continued

395023085492846 ACTTR1–3–2–D piezometer at Mohawk R 06/29/04 1830 <0.02 0.05 <0.02

R 10/22/04 1200 <.02 <.02 <.02

395023085492850 ACTTR1–3–3–D piezometer at Mohawk R 06/30/04 1100 <.02 .05 <.02

R 10/22/04 1430 <.02 <.02 <.02

395023085492853 ACTTR1–3–4–A piezometer at Mohawk FB 06/30/04 1258 <.02 <.02 <.02

R 06/30/04 1300 <.02 .06 <.02

FR 06/30/04 1301 <.02 .03 <.02

R 10/22/04 1500 <.02 .09 <.02

395023085492822 ACTTR1–3–4–A piezometer at Mohawk FB 10/25/04 1608 <.02 <.02 <.02

395023085492856 ACTTR1–3–4–D piezometer at Mohawk R 06/30/04 1430 <.02 .04 <.02

FR 06/30/04 1431 <.02 .05 <.02

R 10/22/04 1530 <.02 <.02 <.02

395124085510801 Tile drain ACTTD1–1 at Mohawk R 03/22/04 1030 <.02 <.02 <.02

R 03/30/04 1030 <.02 .07 <.02

R 05/15/04 1335 .28 .09 <.02

R 05/19/04 0230 3.8 2.6 <.02

R 05/19/04 0330 1.2 .18 <.02

R 05/19/04 0440 .74 .69 <.02

FR 05/19/04 0441 .93 .19 <.02

R 05/19/04 1510 .27 .07 <.02

R 05/20/04 1345 .15 .07 <.02

R 05/30/04 2130 1.5 .17 <.02

R 05/30/04 2130 2.6 .61 <.02

R 05/30/04 2330 3.7 .54 <.02

R 05/31/04 0530 4.7 1.0 <.02

R 05/31/04 1215 1.2 0.82 <0.02

R 06/01/04 1215 .34 .21 <.02

R 06/01/04 1216 .32 .20 <.02

Data Tables  97
Table 6. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in Toxic Substances Hydrology Program studies, 2001–06.—

Continued

[Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/day/

year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Sensitive environments study, 2004–06—Continued

Leary Weber Ditch Basin, Indiana (ground water)—Continued

395124085510801 Tile drain ACTTD1–1 at Mohawk R 06/30/04 1745 0.08 0.15 <0.02

FB 08/26/04 1200 <.02 <.02 <.02

R 04/19/05 1545 <.02 .43 <.02

R 06/12/05 2100 .04 .25 <.02

R 06/12/05 2200 .04 .19 <.02

R 06/12/05 2300 <.02 .16 <.02

R 06/13/05 0600 .04 .15 <.02

R 06/13/05 2200 <.02 .15 <.02

R 06/14/05 1130 <.02 .14 <.02

395045085510930 Vadose zone ACTVZ1–1A at Mohawk R 05/25/04 1110 <.02 .06 <.02

R 06/22/04 1630 <.02 .09 <.02

R 10/20/04 1145 <.02 <.02 <.02

R 06/22/05 1130 <.02 .06 <.02

395045085510931 Vadose zone ACTVZ1–1B at Mohawk R 04/06/04 1100 <.02 .05 <.02

R 05/25/04 1100 <.02 .05 <.02

R 06/22/04 1640 <.02 .03 <.02

R 10/20/04 1155 <.02 <.02 <.02

R 06/22/05 1140 .03 <.02 <.02

395045085510932 Vadose zone ACTVZ1–1C at Mohawk R 04/06/04 1100 .03 .09 <.02

R 05/25/04 1130 <.02 .08 <.02

R 06/22/04 1650 <.02 .03 <.02

R 08/24/04 0925 <.02 <.02 <.02

R 10/20/04 1205 <.02 <.02 <.02

R 06/22/05 1150 <.02 <.02 <.02

395045085510933 Vadose zone ACTVZ1–1D at Mohawk (saturated) R 04/06/04 1100 .05 .29 <.02

R 05/25/04 1140 .14 .20 <.02

R 06/22/04 1700 .04 .24 <.02

98  Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 6. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in Toxic Substances Hydrology Program studies, 2001–06.—

Continued

[Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/day/

year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Sensitive environments study, 2004–06—Continued

Leary Weber Ditch Basin, Indiana (ground water)—Continued

395045085510933 Vadose zone ACTVZ1–1D at Mohawk (unsaturated) R 10/20/04 1215 <0.02 <0.02 <0.02

R 06/22/05 1200 <.02 <.02 <.02

395151085504540 Vadose zone ACTVZ1–2F at Mohawk (unsaturated) R 05/25/04 1000 .02 .17 <.02

395151085504541 Vadose zone ACTVZ1–2F at Mohawk (unsaturated) R 05/25/04 1010 .02 .14 <.02

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (saturated) R 05/25/04 1015 <.02 .06 <.02

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (saturated) R 06/22/04 1200 <.02 .08 <.02

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (unsaturated) R 08/24/04 1015 <.02 <.02 <.02

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (unsaturated) R 10/20/04 1300 <.02 <.02 <.02

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (saturated) R 06/22/05 0900 <.02 <.02 <.02

395151085504531 Vadose zone ACTVZ1–2A at Mohawk (saturated) R 05/25/04 1025 .02 .08 <.02

395151085504531 Vadose zone ACTVZ1–2B at Mohawk (unsaturated) R 08/24/04 1020 <.02 .11 <.02

395151085504531 Vadose zone ACTVZ1–2B at Mohawk (unsaturated) R 10/20/04 1310 <.02 <.02 <.02

395151085504531 Vadose zone ACTVZ1–2B at Mohawk (unsaturated) R 06/22/05 0910 <.02 .12 <.02

395151085504532 Vadose zone ACTVZ1–2C at Mohawk (unsaturated) R 08/24/04 1025 <.02 .16 <.02

395151085504532 Vadose zone ACTVZ1–2C at Mohawk (unsaturated) R 10/20/04 1320 .05 <.02 <.02

395151085504532 Vadose zone ACTVZ1–2C at Mohawk (saturated) R 06/22/05 0920 <.02 .09 <.02

395151085504533 Vadose zone ACTVZ1–2D at Mohawk (saturated) R 08/24/04 1030 <.02 .12 <.02

395151085504533 Vadose zone ACTVZ1–2D at Mohawk (saturated) R 06/22/05 0930 <.02 .08 <.02

395025085493501 Well ACTAS1–3A at Mohawk R 06/21/04 1245 <.02 .05 <.02

395025085493501 Well ACTAS1–3A at Mohawk FR 06/21/04 1246 <.02 .05 <.02

395025085493501 Well ACTAS1–3A at Mohawk FR 06/21/04 1248 <.02 .04 <.02

395025085493501 Well ACTAS1–3A at Mohawk R 10/15/04 1200 <.02 <.02 <.02

395046085510903 Well ACTAS1–1B at Mohawk (saturated) R 06/22/04 1430 .13 .16 <.02

395046085510903 Well ACTAS1–1B at Mohawk (saturated) R 06/22/05 1200 .12 <.02 <.02

395046085510901 Well ACTAS1–1C at Mohawk (saturated) R 10/21/04 1100 <.02 .10 <.02

395046085510901 Well ACTAS1–1C at Mohawk (saturated) R 06/22/05 1300 .08 <.02 <.02

Data Tables  99
Table 6. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in Toxic Substances Hydrology Program studies, 2001–06.—

Continued

[Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/day/

year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Sensitive environments study, 2004–06—Continued

Leary Weber Ditch Basin, Indiana (ground water)—Continued

395046085510902 Well ACTAS1–1D at Mohawk (saturated) R 10/21/04 1200 0.03 <0.02 <0.02

395046085510902 Well ACTAS1–1D at Mohawk R 06/22/04 1530 <.02 .05 <.02

395046085510902 Well ACTAS1–1D at Mohawk R 06/22/05 1230 <.02 <.02 <.02

395151085504504 Well ACTAS1–2A at Mohawk R 06/22/04 1100 .04 .09 <.02

395151085504504 Well ACTAS1–2A at Mohawk R 06/22/05 0930 .02 .11 <.02

395151085504503 Well ACTAS1–2B at Mohawk R 11/08/04 1130 <.02 .17 <.02

395151085504503 Well ACTAS1–2B at Mohawk R 06/22/05 1000 <.02 .06 <.02

395151085504502 Well ACTAS1–2C at Mohawk R 06/22/05 1030 .04 .05 <.02

395151085504501 Well ACTAS1–2D at Mohawk R 06/22/04 1200 <.02 .05 <.02

395151085504501 Well ACTAS1–2D at Mohawk R 11/08/04 1200 <.02 <.02 <.02

395151085504501 Well ACTAS1–2D at Mohawk R 06/22/05 1100 <.02 <.02 <.02

Leary Weber Ditch Basin, Indiana (surface water)

03361638 Leary Weber Ditch near Mohawk (composite) R 11/02/04 0845 <.02 <.02 <.02

03361638 Leary Weber Ditch near Mohawk R 11/02/04 0845 1.7 .13 <.02

03361638 Leary Weber Ditch near Mohawk R 11/02/04 1045 .14 .26 <.02

03361638 Leary Weber Ditch near Mohawk R 11/02/04 1345 <.02 <.02 <.02

03361638 Leary Weber Ditch near Mohawk R 11/03/04 1100 <.02 <.02 <.02

03361638 Leary Weber Ditch near Mohawk R 04/19/05 1845 <.02 <.02 <.02

03361638 Leary Weber Ditch near Mohawk R 03/22/04 1015 <.02 <.02 <.02

03361638 Leary Weber Ditch near Mohawk R 03/30/04 1015 <.02 .10 <.02

03361638 Leary Weber Ditch near Mohawk LD 03/30/04 1015 <.02 .06 <.02

03361638 Leary Weber Ditch near Mohawk R 05/14/04 1545 .50 .06 <.02

03361638 Leary Weber Ditch near Mohawk R 05/19/04 0315 2.1 .23 <.02

03361638 Leary Weber Ditch near Mohawk FR 05/19/04 0315 1.1 .23 <.02

03361638 Leary Weber Ditch near Mohawk R 05/19/04 0715 1.1 .13 <.02

03361638 Leary Weber Ditch near Mohawk R 05/19/04 1100 .72 .23 <.02

03361638 Leary Weber Ditch near Mohawk R 05/20/04 0330 .27 .08 <.02

100 Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 6. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in Toxic Substances Hydrology Program studies, 2001–06.—

Continued

[Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/day/

year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Sensitive environments study, 2004–06—Continued

Leary Weber Ditch Basin, Indiana (surface water)—Continued

03361638 Leary Weber Ditch near Mohawk R 05/20/04 1600 0.16 0.14 <0.02

03361638 Leary Weber Ditch near Mohawk R 05/30/04 2200 .47 .18 <.02

03361638 Leary Weber Ditch near Mohawk R 05/30/04 2200 2.1 .62 <.02

03361638 Leary Weber Ditch near Mohawk R 05/31/04 0100 5.5 .58 <.02

03361638 Leary Weber Ditch near Mohawk R 05/31/04 0400 4.9 .39 <.02

03361638 Leary Weber Ditch near Mohawk R 05/31/04 2045 1.1 .07 <.02

03361638 Leary Weber Ditch near Mohawk R 06/01/04 1400 .55 .25 <.02

03361638 Leary Weber Ditch near Mohawk R 06/01/04 1401 .54 .31 <.02

03361638 Leary Weber Ditch near Mohawk R 06/30/04 1800 .08 .23 <.02

03361638 Leary Weber Ditch near Mohawk FB 08/26/04 1000 <.02 <.02 <.02

03361638 Leary Weber Ditch near Mohawk R 06/12/05 2045 .20 <.02 <.02

03361638 Leary Weber Ditch near Mohawk R 06/12/05 2245 .49 .56 <.02

03361638 Leary Weber Ditch near Mohawk R 06/13/05 0045 2.0 .81 1.5

03361638 Leary Weber Ditch near Mohawk R 06/13/05 0145 2.9 .69 .24

03361638 Leary Weber Ditch near Mohawk R 06/13/05 1345 .52 .33 <.02

03361638 Leary Weber Ditch near Mohawk R 06/14/05 1215 .15 .19 <.02

395120085502401 Overland flow ACTOF1–1 at Mohawk R 05/19/04 0128 310 27 <0.02

395120085502401 Overland flow ACTOF1–1 at Mohawk R 05/19/04 0158 418 25 <.02

395120085502401 Overland flow ACTOF1–1 at Mohawk R 05/19/04 0228 427 29 <.02

395120085502401 Overland flow ACTOF1–1 at Mohawk R 05/19/04 0258 376 24 <.02

395120085502401 Overland flow ACTOF1–1 at Mohawk R 05/19/04 0410 359 26 <.02

395120085502401 Overland flow ACTOF1–1 at Mohawk FR 05/19/04 0411 385 25 <.02

395120085502401 Overland flow ACTOF1–1 at Mohawk R 05/19/04 0500 377 28 <.02

395120085502401 Overland flow ACTOF1–1 at Mohawk R 05/30/04 2130 41 8.2 <.02

395120085502401 Overland flow ACTOF1–1 at Mohawk R 05/30/04 2230 22 3.7 <.02

395120085502401 Overland flow ACTOF1–1 at Mohawk R 05/30/04 2330 25 4.3 <.02

395120085502401 Overland flow ACTOF1–1 at Mohawk R 05/31/04 0201 31 6.7 <.02

395120085502401 Overland flow ACTOF1–1 at Mohawk FR 05/31/04 0200 38 8.5 <.02

Data Tables 101
Table 6. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in Toxic Substances Hydrology Program studies, 2001–06.—

Continued

[Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/day/

year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Sensitive environments study, 2004–06—Continued

Leary Weber Ditch Basin, Indiana (surface water)—Continued

395120085502401 Overland flow ACTOF1–1 at Mohawk R 05/31/04 0530 49 11 <0.02

395120085502401 Overland flow ACTOF1–1 at Mohawk R 05/31/04 1050 34 16 <.02

395120085502401 Overland flow ACTOF1–1 at Mohawk FB 08/26/04 1100 <.02 <.02 <.02

395120085502401 Overland flow ACTOF1–1 at Mohawk R 06/12/05 2100 .20 1.3 <.02

394340085524601 Sugar Creek at Co Road 400 South at New Palestine R 05/19/04 0200 .32 .21 <.02

394340085524601 Sugar Creek at Co Road 400 South at New Palestine R 05/20/04 1200 .20 .12 <.02

394340085524601 Sugar Creek at Co Road 400 South at New Palestine R 05/21/04 1330 .15 .14 <.02

394340085524601 Sugar Creek at Co Road 400 South at New Palestine R 05/14/04 2100 .06 .09 <.02

394340085524601 Sugar Creek at Co Road 400 South at New Palestine R 05/19/04 0600 .66 .07 <.02

394340085524601 Sugar Creek at Co Road 400 South at New Palestine R 05/19/04 1000 1.0 .36 <.02

394340085524601 Sugar Creek at Co Road 400 South at New Palestine R 05/31/04 0430 1.0 .19 <.02

394340085524601 Sugar Creek at Co Road 400 South at New Palestine R 11/02/04 0400 .03 .07 <.02

394340085524601 Sugar Creek at Co Road 400 South at New Palestine R 11/02/04 0400 .04 <.02 <.02

394340085524601 Sugar Creek at Co Road 400 South at New Palestine R 11/02/04 1000 .04 <.02 <.02

394340085524601 Sugar Creek at Co Road 400 South at New Palestine R 11/03/04 1200 <.02 <.02 <.02

394340085524601 Sugar Creek at Co Road 400 South at New Palestine R 05/31/04 1030 1.6 .23 <.02

394340085524601 Sugar Creek at Co Road 400 South at New Palestine R 05/31/04 0430 .74 .39 <.02

394340085524601 Sugar Creek at Co Road 400 South at New Palestine R 06/01/04 1015 .66 .48 <.02

394340085524601 Sugar Creek at Co Road 400 South at New Palestine R 06/02/04 1630 .51 .74 <.02

394340085524601 Sugar Creek at Co Road 400 South at New Palestine R 06/02/04 1631 .37 .44 <.02

394340085524601 Sugar Creek at Co Road 400 South at New Palestine FB 08/26/04 0900 <.02 <.02 <.02

394340085524601 Sugar Creek at Co Road 400 South at New Palestine R 11/02/04 1200 .05 .17 <.02

Leary Weber Ditch Basin, Indiana (rainfall)

395151085504595 Rain sampler ACTRS1–2 at Mohawk R 04/27/04 1100 1.1 .07 <.02

395151085504595 Rain sampler ACTRS1–2 at Mohawk R 05/12/04 0930 .67 .21 <.02

395151085504595 Rain sampler ACTRS1–2 at Mohawk R 05/18/04 1015 .15 .06 <.02

395151085504595 Rain sampler ACTRS1–2 at Mohawk R 05/25/04 0930 .04 .06 <.02

395151085504595 Rain sampler ACTRS1–2 at Mohawk R 06/08/04 1000 .12 .08 <.02

102 Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples
Table 6. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in Toxic Substances Hydrology Program studies, 2001–06.—

Continued

[Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location

Sample 

type

Date of 

collection 

(month/day/

year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Sensitive environments study, 2004–06—Continued

Leary Weber Ditch Basin, Indiana (rainfall)—Continued

395151085504595 Rain sampler ACTRS1–2 at Mohawk (composite) R 06/15/04 1000 0.10 0.08 <0.02

395151085504595 Rain sampler ACTRS1–2 at Mohawk (composite) R 06/29/04 1030 .24 .17 <.02

395151085504595 Rain sampler ACTRS1–2 at Mohawk (composite) R 07/06/04 1215 .20 .07 <.02

395151085504595 Rain sampler ACTRS1–2 at Mohawk (composite) R 07/20/04 1200 .20 .47 <.02

395151085504595 Rain sampler ACTRS1–2 at Mohawk (composite) R 08/03/04 1100 .06 .02 <.02

395151085504595 Rain sampler ACTRS1–2 at Mohawk (composite) R 08/17/04 1200 .11 .04 <.02

395151085504595 Rain sampler ACTRS1–2 at Mohawk (composite) R 08/24/04 0945 <.02 .03 <.02

395151085504595 Rain sampler ACTRS1–2 at Mohawk R 11/08/04 1000 <.02 <.02 <.02

395151085504595 Rain sampler ACTRS1–2 at Mohawk R 06/07/05 1045 .03 <.02 <.02

Data Tables 103
104  Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples

Table 6. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in Toxic Substances Hydrology Program studies, 2001–06.—

Continued

[Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location/soil core depth in inches (“)

Sample 

type

Date of 

collection 

(month/day/

year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Sensitive environments study, 2004–06—Continued

 Leary Weber Ditch Basin, Indiana (soils) 

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 0–6”) R 04/15/04 1000 23 109 --

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 0–6”) R 04/15/04 1001 12 109 --

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 0–6”) R 04/15/04 1002 7.0 70 --

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 0–6”) R 05/24/04 1500 110 112 --

395045085510930 Vadose zone ACTVZ1-1A at Mohawk (South, 0-6”) R 05/24/04 1501 332 91 --

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 0–6”) LD 05/24/04 1501 269 99 --

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 0–6”) R 05/24/04 1502 62 136 --

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 6–12”) R 05/24/04 1700 9.0 14 --

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 6–12”) R 05/24/04 1701 14 9.0 --

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 6–12”) R 05/24/04 1702 12 22 --

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 12–18”) R 05/24/04 1730 11 7.0 --

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 12–18”) R 05/24/04 1731 10 10 --

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 12–18”) R 05/24/04 1732 12 13 --

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 0–6”) R 07/07/04 1500 55 167 --

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 0–6”) R 07/07/04 1501 163 185 --

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 0–6”) R 07/07/04 1502 33 116 --

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 6–12”) R 07/07/04 1530 8.6 21 --

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 6–12”) R 07/07/04 1531 22 23 --

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 6–12”) R 07/07/04 1532 46 25 --

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 12–18”) R 07/07/04 1600 11 12 --

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 12–18”) R 07/07/04 1601 15 18 --

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 12–18”) R 07/07/04 1602 4.9 9.2 --

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 0–6”) R 10/21/04 1200 27 132 <1.0

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 0–6”) R 10/21/04 1201 6.9 69 <1.0

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 0–6”) R 10/21/04 1202 44 105 <1.0

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 0–6”) LD 10/21/04 1202 46 113 <1.0

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 6–12”) R 10/21/04 1210 <1.0 2.2 <1.0

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 6–12”) R 10/21/04 1211 <1.0 <1.0 <1.0
Data Tables 105

Table 6. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in Toxic Substances Hydrology Program studies, 2001–06.—

Continued

[Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location/soil core depth in inches (“)

Sample 

type

Date of 

collection 

(month/day/

year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Sensitive environments study, 2004–06—Continued

 Leary Weber Ditch Basin, Indiana (soils)—Continued

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 6–12”) R 10/21/04 1212 <1.0 3.8 <1.0

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 12–18”) R 10/21/04 1220 <1.0 <1.0 <1.0

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 12–18”) R 10/21/04 1221 <1.0 <1.0 <1.0

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 12–18”) R 10/21/04 1222 <1.0 <1.0 <1.0

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 0–6”) R 04/19/05 0930 7.2 39 <1.0

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 0–6”) R 04/19/05 0940 2.2 43 <1.0

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 0–6”) R 04/19/05 0941 <1.0 10 <1.0

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 6–12”) R 04/19/05 0931 1.2 8.5 <1.0

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 6–12”) R 04/19/05 0942 1.7 9.3 <1.0

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 6–12”) LD 04/19/05 0942 1.5 8.8 <1.0

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 6–12”) R 04/19/05 0950 6.4 47 <1.0

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 12–18”) R 04/19/05 0932 <1.0 1.6 <1.0

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 12–18”) R 04/19/05 0951 1.8 9.8 <1.0

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 12–18”) R 04/19/05 0952 <1.0 2.6 <1.0

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 0–6”) R 05/25/05 1500 12 68 <1.0

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 0–6”) R 05/25/05 1510 6.0 33 <1.0

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 0–6”) R 05/25/05 1520 7.9 52 <1.0

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 6–12”) R 05/25/05 1501 <1.0 2.5 <1.0

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 6–12”) R 05/25/05 1511 <1.0 5.4 <1.0

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 6–12”) R 05/25/05 1521 <1.0 4.9 <1.0

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 12–18”) R 05/25/05 1502 <1.0 <1.0 <1.0

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 12–18”) R 05/25/05 1512 <1.0 2.0 <1.0

395045085510930 Vadose zone ACTVZ1–1A at Mohawk (South, 12–18”) R 05/25/05 1522 <1.0 <1.0 <1.0

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 0–6”) R 04/15/04 0900 7.0 144 --

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 0–6”) LD 04/15/04 0900 8.0 144 --

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 0–6”) R 04/15/04 0901 6.0 112 --

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 0–6”) R 04/15/04 0902 10 157 --

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 0–6”) R 05/24/04 1300 47 113 --
106 Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples

Table 6. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in Toxic Substances Hydrology Program studies, 2001–06.—

Continued

[Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location/soil core depth in inches (“)

Sample 

type

Date of 

collection 

(month/day/

year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Sensitive environments study, 2004–06—Continued

 Leary Weber Ditch Basin, Indiana (soils)—Continued

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 0–6”) LD 05/24/04 1300 69 85 --

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 0–6”) R 05/24/04 1301 78 116 --

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 0–6”) R 05/24/04 1302 67 208 --

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 6–12”) R 05/24/04 1315 6.0 22 --

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 6–12”) R 05/24/04 1316 3.0 21 --

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 6–12”) R 05/24/04 1317 1.0 13 --

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 12–18”) R 05/24/04 1330 1.0 2.0 --

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 12–18”) R 05/24/04 1331 15 21 --

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 12–18”) R 05/24/04 1332 1.0 3.0 --

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 0–6”) R 07/07/04 1300 85 162 --

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 0–6”) R 07/07/04 1301 23 142 --

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 0–6”) R 07/07/04 1302 90 169 --

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 6–12”) R 07/07/04 1330 17 31 --

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 6–12”) R 07/07/04 1331 2.2 13 --

395151085504530 Vadose zone ACTVZ1-2A at Mohawk (North, 6–12”) R 07/07/04 1332 12 21 --

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 12–18”) R 07/07/04 1400 2.5 9.8 --

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 12–18”) R 07/07/04 1401 3.7 14 --

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 12–18”) R 07/07/04 1402 6.1 12 --

39515108504530 Vadose zone ACTVZ1–2A at Mohawk (North, 0–6”) R 10/21/04 0930 25 127 <1.0

39515108504530 Vadose zone ACTVZ1–2A at Mohawk (North, 0–6”) LD 10/21/04 0930 27 99 <1.0

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 0–6”) R 10/21/04 0931 60 477 <1.0

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 0–6”) R 10/21/04 0932 144 956 <1.0

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 6–12”) R 10/21/04 0940 <1.0 9.5 <1.0

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 6–12”) LD 10/21/04 0940 <1.0 11 <1.0

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 6–12”) R 10/21/04 0941 <1.0 1.9 <1.0

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 6–12”) R 10/21/04 0942 <1.0 4.9 1.0

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 12–18”) R 10/21/04 0950 <1.0 <1.0 <1.0

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 12–18”) R 10/21/04 0951 <1.0 <1.0 <1.0
Data Tables 107

Table 6. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in Toxic Substances Hydrology Program studies, 2001–06.—

Continued

[Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location/soil core depth in inches (“)

Sample 

type

Date of 

collection 

(month/day/

year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Sensitive environments study, 2004–06—Continued

 Leary Weber Ditch Basin, Indiana (soils)—Continued

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 12–18”) R 10/21/04 0952 <1.0 <1.0 <1.0

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 0–6”) R 04/19/05 1030 18 75 <1.0

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 0–6”) R 04/19/05 1040 8.0 62 <1.0

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 0–6”) R 04/19/05 1041 <1.0 6.9 <1.0

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 6–12”) R 04/19/05 1031 1.0 4.1 <1.0

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 6–12”) R 04/19/05 1042 <1.0 <1.0 <1.0

395151085504530 Vadose zone ACTVZ1-2A at Mohawk (North, 6–12”) R 04/19/05 1050 2.6 33 <1.0

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 12–18”) R 04/19/05 1032 <1.0 1.3 <1.0

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 12–18”) R 04/19/05 1051 <1.0 9.3 <1.0

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 12–18”) R 04/19/05 1052 <1.0 <1.0 <1.0

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 0–6”) R 05/25/05 0900 36 148 <1.0

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 0–6”) R 05/25/05 0910 9.7 119 <1.0

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 0–6”) R 05/25/05 0920 28 58 <1.0

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 6–12”) R 05/25/05 0901 3.0 12 <1.0

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 6–12”) R 05/25/05 0911 <1.0 2.0 <1.0

395151085504530 Vadose zone ACTVZ1-2A at Mohawk (North, 6–12”) LD 05/25/05 0911 <1.0 2.3 <1.0

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 6–12”) R 05/25/05 0921 <1.0 1.6 <1.0

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 12–18”) R 05/25/05 0902 1.3 8.4 <1.0

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North, 12–18”) R 05/25/05 0912 <1.0 <1.0 <1.0

395151085504530 Vadose zone ACTVZ1–2A at Mohawk (North-12-18”) R 05/25/05 0922 <1.0 <1.0 <1.0

395120085502401 Vadose ACT: Overland Flow at Mohawk (0–6”) R 07/07/04 1100 476 341 --

395120085502401 Vadose ACT: Overland Flow at Mohawk (0–6”) R 07/07/04 1101 103 127 --

395120085502401 Vadose ACT: Overland Flow at Mohawk (0–6”) R 07/07/04 1102 88 150 --

395120085502401 Vadose ACT: Overland Flow at Mohawk (6–12”) R 07/07/04 1130 24 21 --

395120085502401 Vadose ACT: Overland Flow at Mohawk (6–12”) R 07/07/04 1131 4.4 9.4 --

395120085502401 Vadose ACT: Overland Flow at Mohawk (6–12”) R 07/07/04 1132 40 54 --

395120085502401 Vadose ACT: Overland Flow at Mohawk (12–18”) R 07/07/04 1200 19 14 --

395120085502401 Vadose ACT: Overland Flow at Mohawk (12–18”) R 07/07/04 1201 17 25 --
108  Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples

Table 6. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in Toxic Substances Hydrology Program studies, 2001–06.—

Continued

[Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location/soil core depth in inches (“)

Sample 

type

Date of 

collection 

(month/day/

year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Sensitive environments study, 2004–06—Continued

 Leary Weber Ditch Basin, Indiana (soils)—Continued

395120085502401 Vadose ACT: Overland Flow at Mohawk (12–18”) R 07/07/04 1202 19 29 --

395120085502401 Vadose ACT: Overland Flow at Mohawk (0–6”) R 10/21/04 1400 <1.0 6.9 <1.0

395120085502401 Vadose ACT: Overland Flow at Mohawk (0–6”) R 10/21/04 1401 46 257 <1.0

395120085502401 Vadose ACT: Overland Flow at Mohawk (0–6”) R 10/21/04 1402 48 116 <1.0

395120085502401 Vadose ACT: Overland Flow at Mohawk (6–12”) R 10/21/04 1500 <1.0 5.9 <1.0

395120085502401 Vadose ACT: Overland Flow at Mohawk (6–12”) R 10/21/04 1501 1.4 5.7 <1.0

395120085502401 Vadose ACT: Overland Flow at Mohawk (6–12”) R 10/21/04 1502 1.4 <1.0 <1.0

395120085502401 Vadose ACT: Overland Flow at Mohawk (12–18”) R 10/21/04 1520 <1.0 1.0 <1.0

395120085502401 Vadose ACT: Overland Flow at Mohawk (12–18”) R 10/21/04 1521 <1.0 1.0 <1.0

395120085502401 Vadose ACT: Overland Flow at Mohawk (12–18”) R 10/21/04 1522 <1.0 1.1 <1.0

395120085502401 Vadose ACT: Overland Flow at Mohawk (0–6”) R 04/19/05 1130 14 73 <1.0

395120085502401 Vadose ACT: Overland Flow at Mohawk (0–6”) R 04/19/05 1140 17 133 <1.0

395120085502401 Vadose ACT: Overland Flow at Mohawk (0-6”) LD 04/19/05 1140 17 136 <1.0

395120085502401 Vadose ACT: Overland Flow at Mohawk (0–6”) R 04/19/05 1141 4.0 5.0 <1.0

395120085502401 Vadose ACT: Overland Flow at Mohawk (6–12”) R 04/19/05 1131 1.6 <1.0 <1.0

395120085502401 Vadose ACT: Overland Flow at Mohawk (6–12”) R 04/19/05 1142 1.5 10 <1.0

395120085502401 Vadose ACT: Overland Flow at Mohawk (6-12”) R 04/19/05 1150 23 90 <1.0

395120085502401 Vadose ACT: Overland Flow at Mohawk (12–18”) R 04/19/05 1132 <1.0 <1.0 <1.0

395120085502401 Vadose ACT: Overland Flow at Mohawk (12–18”) LD 04/19/05 1132 <1.0 <1.0 <1.0

395120085502401 Vadose ACT: Overland Flow at Mohawk (12–18”) R 04/19/05 1151 2.1 3.4 <1.0

395120085502401 Vadose ACT: Overland Flow at Mohawk (12–18”) R 04/19/05 1152 <1.0 2.4 <1.0

395120085502401 Vadose ACT: Overland Flow at Mohawk (0–6”) R 05/25/05 1000 3.4 29 <1.0

395120085502401 Vadose ACT: Overland Flow at Mohawk (0–6”) R 05/25/05 1010 6.7 58 <1.0

395120085502401 Vadose ACT: Overland Flow at Mohawk (0-6”) R 05/25/05 1020 13 79 <1.0

395120085502401 Vadose ACT: Overland Flow at Mohawk (6–12”) R 05/25/05 1001 <1.0 4.5 <1.0

395120085502401 Vadose ACT: Overland Flow at Mohawk (6–12”) R 05/25/05 1011 1.7 9.7 <1.0

395120085502401 Vadose ACT: Overland Flow at Mohawk (6–12”) R 05/25/05 1021 <1.0 4.6 <1.0

395120085502401 Vadose ACT: Overland Flow at Mohawk (12–18”) R 05/25/05 1002 <1.0 4.2 <1.0
Data Tables 109

Table 6. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in Toxic Substances Hydrology Program studies, 2001–06.—

Continued

[Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location/soil core depth in inches (“)

Sample 

type

Date of 

collection 

(month/day/

year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Sensitive environments study, 2004–06—Continued

 Leary Weber Ditch Basin, Indiana (soils)—Continued

395120085502401 Vadose ACT: Overland Flow at Mohawk (12–18”) R 05/25/05 1012 1.8 22 <1.0

395120085502401 Vadose ACT: Overland Flow at Mohawk (12–18”) LD 05/25/05 1012 <1.0 18 <1.0

395120085502401 Vadose ACT: Overland Flow at Mohawk (12–18”) R 05/25/05 1022 <1.0 <1.0 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (0–6”) R 07/07/04 0930 31 60 --

395124085510801 Vadose ACT: Tile drain at Mohawk (0–6”) R 07/07/04 0931 39 74 --

395124085510801 Vadose ACT: Tile drain at Mohawk (0–6”) R 07/07/04 0932 3.3 49 --

395124085510801 Vadose ACT: Tile drain at Mohawk (6–12”) R 07/07/04 1000 1.9 11 --

395124085510801 Vadose ACT: Tile drain at Mohawk (6–12”) R 07/07/04 1001 9.6 15 --

395124085510801 Vadose ACT: Tile drain at Mohawk (6–12”) R 07/07/04 1002 5.2 21 --

395124085510801 Vadose ACT: Tile drain at Mohawk (12–18”) R 07/07/04 1030 <1.0 4.4 --

395124085510801 Vadose ACT: Tile drain at Mohawk (12–18”) R 07/07/04 1031 3.6 5.0 --

395124085510801 Vadose ACT: Tile drain at Mohawk (12–18”) R 07/07/04 1032 2.4 5.2 --

395124085510801 Vadose ACT: Tile drain at Mohawk (0–6”) R 10/21/04 1000 <1.0 3.2 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (0–6”) R 10/21/04 1001 <1.0 17 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (0–6”) R 10/21/04 1002 21 92 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (6–12”) R 10/21/04 1010 <1.0 2.6 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (6–12”) R 10/21/04 1011 7.3 9.9 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (6-12”) R 10/21/04 1012 <1.0 1.8 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (12–18”) R 10/21/04 1020 <1.0 <1.0 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (12–18”) R 10/21/04 1021 <1.0 <1.0 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (12–18”) R 10/21/04 1022 <1.0 4.2 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (0–6”) R 04/19/05 1330 4.7 57 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (0–6”) R 04/19/05 1340 16 106 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (0–6”) R 04/19/05 1341 <1.0 4.5 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (0-6”) R 04/19/05 1530 15 11 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (0–6”) R 04/19/05 1540 17 26 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (0–6”) R 04/19/05 1541 <1.0 2.1 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (6–12”) R 04/19/05 1331 1.0 19 <1.0
110 Concentrations of Glyphosate, Aminomethylphosphonic Acid, and Glufosinate in Water and Soil Samples

Table 6. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in Toxic Substances Hydrology Program studies, 2001–06.—

Continued

[Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location/soil core depth in inches (“)

Sample 

type

Date of 

collection 

(month/day/

year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Sensitive environments study, 2004–06—Continued

 Leary Weber Ditch Basin, Indiana (soils)—Continued

395124085510801 Vadose ACT: Tile drain at Mohawk (6–12”) R 04/19/05 1342 <1.0 2.5 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (6–12”) R 04/19/05 1350 7.0 60 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (6–12”) R 04/19/05 1531 <1.0 <1.0 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (6–12”) R 04/19/05 1542 <1.0 <1.0 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (6–12”) R 04/19/05 1550 17 <1.0 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (12–18”) R 04/19/05 1332 <1.0 6.6 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (12–18”) R 04/19/05 1351 <1.0 2.6 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (12–18”) LD 04/19/05 1351 <1.0 <1.0 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (12–18”) R 04/19/05 1352 <1.0 <1.0 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (12–18”) R 04/19/05 1532 <1.0 1.1 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (12–18”) R 04/19/05 1551 <1.0 <1.0 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (12–18”) R 04/19/05 1552 <1.0 <1.0 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (0–6”) R 05/25/05 1200 6.6 5.5 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (0–6”) R 05/25/05 1210 9.2 1.8 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (0–6”) LD 05/25/05 1210 8.3 2.5 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (0–6”) R 05/25/05 1220 17 3.7 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (0–6”) R 05/25/05 1300 10 104 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (0–6”) R 05/25/05 1310 6.9 65 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (0–6”) R 05/25/05 1320 <1.0 11 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (6–12”) R 05/25/05 1201 <1.0 <1.0 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (6–12”) R 05/25/05 1211 1.7 <1.0 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (6–12”) R 05/25/05 1221 1.0 <1.0 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (6–12”) R 05/25/05 1301 <1.0 13 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (6–12”) R 05/25/05 1311 <1.0 4.7 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (6–12”) LD 05/25/05 1311 <1.0 3.5 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (6-12”) R 05/25/05 1321 <1.0 <1.0 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (12–18”) R 05/25/05 1202 4.1 <1.0 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (12–18”) R 05/25/05 1212 7.1 <1.0 <1.0
Table 6. Analytical results for glyphosate, aminomethylphosphonic acid, and glufosinate in Toxic Substances Hydrology Program studies, 2001–06.—

Continued

[Sample type: FB, field blank; FR, field replicate; R, regular; LD, laboratory duplicate; --, no data; <, less than; μg/L, micrograms per liter]

Site number Site location/soil core depth in inches (“)

Sample 

type

Date of 

collection 

(month/day/

year)

Collection 

time 

(24-

hour)

Concentrations

Glyphosate 

(μg/L)

Aminomethylphosphonic 

acid 

(μg/L)

Glufosinate 

(μg/L)

Sensitive environments study, 2004–06—Continued

 Leary Weber Ditch Basin, Indiana (soils)—Continued

395124085510801 Vadose ACT: Tile drain at Mohawk (12–18”) R 05/25/05 1222 3.5 <1.0 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (12–18”) R 05/25/05 1302 <1.0 1.9 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (12–18”) R 05/25/05 1312 <1.0 <1.0 <1.0

395124085510801 Vadose ACT: Tile drain at Mohawk (12–18”) R 05/25/05 1322 <1.0 1.7 <1.0

03361638 Leary Weber Ditch at Mohawk (0–6”) R 04/19/05 1730 2.2 4.0 <1.0

03361638 Leary Weber Ditch at Mohawk (0–6”) FR 04/19/05 1740 <1.0 <1.0 <1.0

03361638 Leary Weber Ditch at Mohawk (0–6”) FR 04/19/05 1750 <1.0 <1.0 <1.0

03361638 Leary Weber Ditch at Mohawk (0–6”) FR 04/19/05 1751 <1.0 <1.0 <1.0

03361638 Leary Weber Ditch at Mohawk (0–6”) R 05/25/05 1100 <1.0 <1.0 <1.0

03361638 Leary Weber Ditch at Mohawk (0–6”) FR 05/25/05 1110 <1.0 <1.0 <1.0

03361638 Leary Weber Ditch at Mohawk (0–6”) FR 05/25/05 1120 <1.0 <1.0 <1.0

Data Tables 111
Prepared by Lawrence Publishing Service Center.

Edited by Lanna Combs.

Illustrations and cover design by Jeff Hartley.

Layout and design by Kristi Hartley.

For more information concerning the research described in this 

report, contact:

U.S. Geological Survey

4821 Quail Crest Place

Lawrence, KS 66049

(785) 842-9909

http://ks.water.usgs.gov
Scribner and others

—Concentrations of Glyphosate, Its Degradation Product, Aminomethylphosphonic Acid, and Glufosinate in Ground- and

 Surface-Water, Rainfall, and Soil Samples Collected in the United States, 2001–06

—Scientific Investigations Report 2007–5122

Printed on recycled paper

District of Columbia

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90° 85°

75°

70°

80°

45°

40°

35°

30°

25°

CANADA 

MEXICO

Gulf of Mexico

Atlantic Ocean

Pacific

Ocean

UNITED STATES

Toxic Substances Program

NASQAN Program

0 125 250 500 MILES

0 125 250 375 500 KILOMETERS

375

115°

110° 105° 100° 95°

90° 85°

75°

70°

80°

120°

45

40°

35°

25°

30°

50°

Rio Grande

Basin

Mississippi River

Basin

Colorado River Basin

Pecos River

Red River

Gila River

Green River

Colorado River

Snake River

Willamette River Yellowstone River

Missouri

River

Mississippi River

South Platte

North Platte Platte River Wabash River

Ohio River

Arkansas River Mississippi River

Atchafalaya River

Rio Grande

Columbia River

Basin

Columbia River

Little Colorado

River

Minnesota River

Tennessee River

Gulf of Mexico

Atlantic Ocean

Pacific

Ocean

Pacific Ocean

Bering Sea

CANADA

MEXICO

UNITED STATES

03612500 07022000

07288955

07373420

Gulf of Alaska

180°

170°

160° 150°

140°

130°

50°

60°

70°

0 200 400 MILES

0 200 400 KILOMETERS

Yukon River

Basin

Yukon River

CANADA

San Juan

River