Federal Register / Vol. 89, No. 20 / Tuesday, January 30, 2024 / Rules and Regulations 5773 

F. Executive Order 13175: Consultation 

and Coordination With Indian Tribal 

Governments 

This action does not have tribal 

implications as specified in Executive 

Order 13175, because this action does 

not apply on any Indian reservation 

land or in any other area where the EPA 

or an Indian tribe has demonstrated that 

a tribe has jurisdiction, and will not 

impose substantial direct compliance 

costs on tribal governments or preempt 

tribal law. Thus, Executive Order 13175 

does not apply to this action. 

G. Executive Order 13045: Protection of 

Children From Environmental Health 

and Safety Risks 

The EPA interprets Executive Order 

13045 as applying only to those 

regulatory actions that concern 

environmental health or safety risks that 

the EPA has reason to believe may 

disproportionately affect children, per 

the definition of ‘‘covered regulatory 

action’’ in section 2–202 of the 

Executive order. This action is not 

subject to Executive Order 13045 

because it does impose additional 

requirements beyond those imposed by 

state law. 

H. Executive Order 13211: Actions That 

Significantly Affect Energy Supply, 

Distribution, or Use 

This action is not subject to Executive 

Order 13211, because it is not a 

significant regulatory action under 

Executive Order 12866. 

I. National Technology Transfer 

Advancement Act (NTTAA) 

This rulemaking does not involve 

technical standards. 

J. Executive Order 12898: Federal 

Actions To Address Environmental 

Justice in Minority Populations and 

Low-Income Populations 

Executive Order 12898 (Federal 

Actions To Address Environmental 

Justice in Minority Populations and 

Low-Income Populations, 59 FR 7629, 

February 16, 1994) directs Federal 

agencies to identify and address 

‘‘disproportionately high and adverse 

human health or environmental effects’’ 

of their actions on minority populations 

and low-income populations to the 

greatest extent practicable and 

permitted by law. EPA defines 

environmental justice (EJ) as ‘‘the fair 

treatment and meaningful involvement 

of all people regardless of race, color, 

national origin, or income with respect 

to the development, implementation, 

and enforcement of environmental laws, 

regulations, and policies.’’ EPA further 

defines the term fair treatment to mean 

that ‘‘no group of people should bear a 

disproportionate burden of 

environmental harms and risks, 

including those resulting from the 

negative environmental consequences of 

industrial, governmental, and 

commercial operations or programs and 

policies.’’ 

The EPA did not perform an EJ 

analysis and did not consider EJ in this 

action. Consideration of EJ is not 

required as part of this action because 

the EPA is performing a nondiscretionary duty to find that a 

required State submission was not 

timely submitted, and there is no 

information in the record inconsistent 

with the stated goals of E.O. 12898 of 

achieving environmental justice for 

people of color, low-income 

populations, and indigenous peoples. 

K. Congressional Review Act (CRA) 

This action is subject to the CRA, and 

the EPA will submit a rule report to 

each House of the Congress and to the 

Comptroller General of the United 

States. This action is not a ‘‘major rule’’ 

as defined by 5 U.S.C. 804(2). 

L. Petitions for Judicial Review 

Under section 307(b)(1) of the Clean 

Air Act, petitions for judicial review of 

this action must be filed in the United 

States Court of Appeals for the 

appropriate circuit by April 1, 2024. 

Filing a petition for reconsideration by 

the Administrator of this final action 

does not affect the finality of this action 

for the purposes of judicial review nor 

does it extend the time within which a 

petition for judicial review may be filed, 

and shall not postpone the effectiveness 

of such action. This action may not be 

challenged later in proceedings to 

enforce its requirements. (See section 

307(b)(2).) 

List of Subjects in 40 CFR Part 52 

Environmental protection, 

Administrative practice and procedures, 

Air pollution control, Approval and 

promulgation of implementation plans, 

Incorporation by reference, 

Intergovernmental relations, Particulate 

matter, Reporting and recordkeeping 

requirements. 

Authority: 42 U.S.C. 7401 et seq. 

Dated: January 23, 2024. 

Martha Guzman Aceves, 

Regional Administrator, Region IX. 

[FR Doc. 2024–01691 Filed 1–29–24; 8:45 am] 

BILLING CODE 6560–50–P 

ENVIRONMENTAL PROTECTION 

AGENCY 

40 CFR Part 141 

[EPA–HQ–OW–2023–0541; FRL–11620–01– 

OW] 

Expedited Approval of Alternative Test 

Procedures for the Analysis of 

Contaminants Under the Safe Drinking 

Water Act; Analysis and Sampling 

Procedures 

AGENCY: Environmental Protection 

Agency (EPA). 

ACTION: Final rule. 

SUMMARY: This action announces the 

Environmental Protection Agency’s 

(EPA’s) approval of alternative testing 

methods for use in measuring the levels 

of contaminants in drinking water to 

determine compliance with national 

primary drinking water regulations. The 

Safe Drinking Water Act authorizes EPA 

to approve the use of alternative testing 

methods through publication in the 

Federal Register. EPA is using this 

streamlined authority to make 93 

additional methods available for 

analyzing drinking water samples. This 

expedited approach provides public 

water systems, laboratories, and 

primacy agencies with more timely 

access to new measurement techniques 

and greater flexibility in the selection of 

analytical methods, thereby reducing 

monitoring costs while maintaining 

public health protection. 

DATES: This action is effective January 

30, 2024. 

ADDRESSES: EPA has established a 

docket for this action under Docket ID 

No. EPA–HQ–OW–2023–0541. All 

documents in the docket are listed on 

the https://www.regulations.gov 

website. Although listed in the index, 

some information is not publicly 

available, e.g., confidential business 

information (CBI) or other information 

whose disclosure is restricted by statute. 

Certain other material, such as 

copyrighted material, is not placed on 

the internet and will be publicly 

available only in hard copy form. 

Publicly available docket materials are 

available electronically through https:// 

www.regulations.gov. 

FOR FURTHER INFORMATION CONTACT: 

Teresa Wells, Technical Support 

Branch, Standards and Risk 

Management Division, Office of Ground 

Water and Drinking Water (MS 140), 

Environmental Protection Agency, 26 

West Martin Luther King Drive, 

Cincinnati, OH 45268; telephone 

number: (513) 569–7128; email address: 

wells.teresa@epa.gov. 


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5774 Federal Register / Vol. 89, No. 20 / Tuesday, January 30, 2024 / Rules and Regulations 

SUPPLEMENTARY INFORMATION: 

I. General Information 

A. Does this action apply to me? 

Public water systems are the regulated 

entities required to measure 

contaminants in drinking water 

samples. In addition, EPA Regions as 

well as States and Tribal governments 

with authority to administer the 

regulatory program for public water 

systems under the Safe Drinking Water 

Act (SDWA) may measure contaminants 

in water samples. When EPA sets a 

monitoring requirement in its national 

primary drinking water regulations for a 

given contaminant, the agency also 

establishes (in the regulations) 

standardized test procedures for 

analysis of the contaminant. This action 

makes alternative testing methods 

available for particular drinking water 

contaminants beyond the testing 

methods currently established in the 

regulations. EPA is providing public 

water systems, required to test water 

samples, with a choice of using either a 

test procedure already established in the 

existing regulations or an alternative 

testing method that has been approved 

in this action or in prior expedited 

approval actions. Categories and entities 

that may ultimately be affected by this 

action include: 

Category Examples of potentially regulated entities NAICS1

State, local, & Tribal governments ........... State, local, and Tribal governments that analyze water samples on behalf of public 

water systems required to conduct such analysis; State, local, and Tribal governments that directly operate community and non-transient non-community water 

systems required to monitor.

924110 

Industry ..................................................... Private operators of community and non-transient non-community water systems 

required to monitor.

221310 

Municipalities ............................................ Municipal operators of community and non-transient non-community water systems 

required to monitor.

924110 

1 North American Industry Classification System. 

This table is not intended to be 

exhaustive, but rather provides a guide 

for readers regarding entities likely to be 

interested in this action. Other types of 

entities not listed in the table could also 

have some interest. To determine 

whether your facility is affected by this 

action, you should carefully examine 

the applicability language in the Code of 

Federal Regulations (CFR) at 40 CFR 

141.2 (definition of a public water 

system). If you have questions regarding 

the applicability of this action to a 

particular entity, consult the person 

listed in the preceding FOR FURTHER

INFORMATION CONTACT section. 

Abbreviations and Acronyms Used in 

This Action 

CFR: Code of Federal Regulations 

EPA: United States Environmental Protection 

Agency 

NAICS: North American Industry 

Classification System 

QC: Quality Control 

SDWA: The Safe Drinking Water Act 

VCSB: Voluntary Consensus Standard Bodies 

II. Background 

A. What is the purpose of this action? 

In this action, EPA is approving 93 

analytical methods for determining 

contaminant concentrations in drinking 

water samples collected under SDWA. 

Regulated entities required to sample 

and monitor may use either the testing 

methods already established in existing 

regulations or the alternative testing 

methods being approved in this action 

or in prior expedited approval actions. 

The new methods are listed along with 

other methods similarly approved 

through previous expedited actions in 

40 CFR part 141, appendix A to subpart 

C and on EPA’s drinking water methods 

website at https://www.epa.gov/dw

analyticalmethods. 

B. What is the basis for this action? 

When EPA determines that an 

alternative analytical method is 

‘‘equally effective’’ (i.e., as effective as a 

method that has already been 

promulgated in the regulations), SDWA 

allows EPA to approve the use of the 

alternative testing method through 

publication in the Federal Register (see 

section 1401(1) of SDWA). EPA is using 

this streamlined approval authority to 

make 93 additional methods available 

for determining contaminant 

concentrations in drinking water 

samples collected under SDWA. EPA 

has determined that, for each 

contaminant or group of contaminants 

listed in section III of this preamble, the 

additional testing methods being 

approved in this action are as effective 

as one or more of the testing methods 

already approved in the regulations for 

those contaminants. Section 1401(1) of 

SDWA states that the newly approved 

methods ‘‘shall be treated as an 

alternative for public water systems to 

the quality control and testing 

procedures listed in the regulation.’’ 

Accordingly, this action makes these 

additional 93 analytical methods legally 

available as options for meeting EPA’s 

monitoring requirements. 

This action does not add regulatory 

language, but does, for informational 

purposes, update an appendix to the 

regulations at 40 CFR part 141 that lists 

all methods approved under section 

1401(1) of SDWA. Accordingly, while 

this action is not a rule, it is updating 

CFR text and therefore is being 

published in the ‘‘Final Rules’’ section 

of the Federal Register. 

III. Summary of Approvals 

EPA is approving 93 methods that are 

equally effective relative to methods 

previously promulgated in the 

regulations. By means of this action, 

these 93 methods are added to appendix 

A to subpart C of 40 CFR part 141. 

A. Methods Developed by Voluntary 

Consensus Standard Bodies (VCSB) 

1. ASTM International. EPA 

compared the most recent version of one 

ASTM International method for 

determination of radium-226 by radon 

emanation to the earlier version of the 

method that is currently approved in 40 

CFR 141.25(a). Changes between the 

earlier approved version and the most 

recent version of the method are 

described more fully in Smith 2023. The 

revisions involve primarily editorial 

changes (e.g., updated references, 

definitions, terminology, procedural 

clarifications, and reorganization of 

text). The revised method is the same as 

the approved version with respect to 

sample collection and handling 

protocols, sample preparation, 

analytical methodology, and method 

performance data; thus, EPA finds it is 

equally effective relative to the 

approved method. 

EPA is thus approving the use of the 

following ASTM method for radium-226 

as listed in the following table: 


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ASTM revised version Approved method Contaminant Regulation citation 

D 3454–21 (ASTM 2021) ................................. D 3454–97 (ASTM 1997) ................................ Radium-226 ................ 40 CFR 141.25(a). 

The ASTM method is available from 

ASTM International, 100 Barr Harbor 

Drive, West Conshohocken, PA 19428– 

2959 or https://www.astm.org. 

2. Standard Methods for the 

Examination of Water and Wastewater 

(Standard Methods). The 24th edition of 

Standard Methods for the Examination 

of Water and Wastewater (APHA 2023) 

was published in 2023. EPA compared 

90 methods in the 24th edition to earlier 

versions of those methods that are 

currently approved in 40 CFR parts 141 

and 143. Changes between the approved 

version and the version of each method 

published in the 24th edition are 

summarized in Smith and Wendelken 

(2023) and Best (2023). The revisions 

primarily involve editorial changes (e.g., 

correction of errors, procedural 

clarifications and reorganization of text). 

The methods in the following table are 

the same as the earlier approved 

versions with respect to the sample 

handling protocols, analytical 

procedures and method performance 

data. For these reasons, EPA has 

concluded that the versions in the 24th 

edition are equally effective relative to 

the currently approved versions in the 

regulations. Therefore, EPA is approving 

the use of 90 Standard Methods in the 

24th edition for the contaminants and 

their respective regulations listed in the 

following table: 

Standard methods, 

24th edition 

(APHA 2023) 

Approved method Contaminant Regulation citations 

2120 B ................................. 2120 B–01, online version (APHA 

2001a).

Color ........................................................ 40 CFR 143.4(b). 

2130 B ................................. 2130 B–01, online version (APHA 

2001b).

Turbidity ................................................... 40 CFR 141.74(a)(1). 

2150 B ................................. 2150 B–97, online version (APHA 

1997a).

Odor ......................................................... 40 CFR 143.4(b). 

2320 B ................................. 2320 B–97, online version (APHA 

1997b).

Alkalinity .................................................. 40 CFR 141.23(k)(1). 

2510 B ................................. 2510 B–97, online version (APHA 

1997c).

Conductivity ............................................. 40 CFR 141.23(k)(1). 

2540 C ................................. 2540 C–97, online version (APHA 

1997d).

Total Dissolved Solids ............................. 40 CFR 143.4(b). 

2550 ..................................... 2550–00, online version (APHA 2000a) Temperature ............................................ 40 CFR 141.23(k)(1). 

3111 B ................................. 3111 B–99, online version (APHA 

1999a).

Calcium, copper, magnesium, nickel, sodium, iron, manganese, silver, zinc.40 CFR 141.23(k)(1); 40 

CFR 143.4(b). 

3111 D ................................. 3111 D–99, online version (APHA 

1999a).

Barium, aluminum ................................... 40 CFR 141.23(k)(1); 40 

CFR 143.4(b). 

3112 B ................................. 3112 B–99, online version (APHA 

1999b).

Mercury .................................................... 40 CFR 141.23(k)(1). 

3113 B ................................. 3113 B, 19th Edition (APHA 1995) ......... Antimony, arsenic, barium, beryllium, 

cadmium, chromium, copper, lead, 

nickel, selenium, aluminum, iron, manganese, silver.

40 CFR 141.23(k)(1); 40 

CFR 143.4(b). 

3114 B ................................. 3114 B–97, online version (APHA 

1997e).

Arsenic, selenium .................................... 40 CFR 141.23(k)(1). 

3120 B ................................. 3120 B–99, online version (APHA 

1999c).

Barium, beryllium, calcium, chromium, 

copper, magnesium, nickel, silica, aluminum, iron, manganese, silver, zinc.

40 CFR 141.23(k)(1); 40 

CFR 143.4(b). 

3500-Ca B ........................... 3500-Ca B–97, online version (APHA 

1997f).

Calcium .................................................... 40 CFR 141.23(k)(1). 

3500-Mg B ........................... 3500-Mg B–97, online version (APHA 

1997g).

Magnesium .............................................. 40 CFR 141.23(k)(1). 

4110 B ................................. 4110 B–00, online version (APHA 

2000b).

Fluoride, nitrate, nitrite, ortho-phosphate, 

chloride, sulfate.

40 CFR 141.23(k)(1); 40 

CFR 143.4(b). 

4500-Cl D,F,G,H .................. 4500-Cl D,F,G,H–00, online versions 

(APHA 2000c).

Free chlorine ........................................... 40 CFR 141.74(a)(2); 40 

CFR 141.131(c)(1). 

4500-Cl D,E,F,G,I ................ 4500-Cl D,E,F,G,I–00, online versions 

(APHA 2000c).

Total chlorine ........................................... 40 CFR 141.74(a)(2); 40 

CFR 141.131(c)(1). 

4500-Cl D,F,G ..................... 4500-Cl D,F,G–00, online versions 

(APHA 2000c).

Combined chlorine .................................. 40 CFR 141.131(c)(1). 

4500-Cl¥B,D ....................... 4500-Cl¥B,D–97, online versions (APHA 

1997h).

Chloride ................................................... 40 CFR 143.4(b). 

4500-ClO2 C ........................ 4500-ClO2 C–00, online version (APHA 

2000d).

Chlorine dioxide ....................................... 40 CFR 141.74(a)(2). 

4500-ClO2 E ........................ 4500-ClO2 E–00, online version (APHA 

2000d).

Chlorine dioxide ....................................... 40 CFR 141.74(a)(2); 40 

CFR 141.131(c)(1). 

4500-ClO2 E ........................ 4500-ClO2 E–00, online version (APHA 

2000d).

Chlorite .................................................... 40 CFR 141.131(b)(1). 

4500–CN¥C,E,F,G .............. 4500–CN¥C,E,F,G, 20th Edition (APHA 

1998).

Cyanide ................................................... 40 CFR 141.23(k)(1). 

4500–F¥B,C,D,E ................. 4500–F¥B,C,D,E–97, online versions 

(APHA 1997i).

Fluoride .................................................... 40 CFR 141.23(k)(1). 


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Standard methods, 

24th edition 

(APHA 2023) 

Approved method Contaminant Regulation citations 

4500–H+ B ........................... 4500–H+ B–00, online version (APHA 

2000e).

pH ............................................................ 40 CFR 141.23(k)(1). 

4500–NO3

¥D ...................... 4500–NO3¥D–00, online version (APHA 

2000f).

Nitrate ...................................................... 40 CFR 141.23(k)(1). 

4500–NO3

¥E,F ................... 4500–NO3¥E,F–00, online versions 

(APHA 2000f).

Nitrate, nitrite ........................................... 40 CFR 141.23(k)(1). 

4500–NO2

¥B ....................... 4500–NO2¥B–00, online version (APHA 

2000g).

Nitrite ....................................................... 40 CFR 141.23(k)(1). 

4500–O3 B ........................... 4500–O3 B–97, online version (APHA 

1997j).

Ozone ...................................................... 40 CFR 141.74(a)(2). 

4500–P E,F .......................... 4500–P E,F, 19th Edition, (APHA 1995) Ortho-phosphate ...................................... 40 CFR 141.23(k)(1). 

4500-SiO2 C,D,E ................. 4500-SiO2 C,D,E–97, online versions 

(APHA 1997k).

Silica ........................................................ 40 CFR 141.23(k)(1). 

4500–SO4

2·C,D,E,F ........... 4500–SO42·C,D,E,F, 19th Edition 

(APHA 1995).

Sulfate ..................................................... 40 CFR 143.4(b). 

5310 B,C. ............................. 5310 B,C–00, online versions (APHA 

2000h).

Dissolved and Total Organic Carbon ...... 40 CFR 141.131(d). 

5540 C ................................. 5540 C–00, online version (APHA 2000i) Foaming agents ....................................... 40 CFR 143.4(b). 

5910 B ................................. 5910 B–00, online version (APHA 2000j) UV Absorption at 254 nm ........................ 40 CFR 141.131(d). 

6251 B ................................. 6251 B–94, online version (APHA 1994) HAA5 ....................................................... 40 CFR 141.131(b)(1). 

6610 B ................................. EPA Method 531.2, Rev. 1.0 (USEPA 

2001).

Carbofuran, oxamyl ................................. 40 CFR 141.24(e)(1). 

6640 B ................................. EPA Method 515.4, Rev. 1.0 (USEPA 

2000).

2,4–D; 2,4,5–TP; Dalapon; Dinoseb; 

Pentachlorophenol; Picloram.

40 CFR 141.24(e)(1). 

6651 B ................................. 6651 B, 20th Edition, (APHA 1998) ........ Glyphosate .............................................. 40 CFR 141.24(e)(1). 

7110 B ................................. 7110 B–00, online version (APHA 

2000k).

Gross alpha and gross beta .................... 40 CFR 141.25(a). 

7110 C ................................. 7110 C–00, online version (APHA 

2000k).

Gross alpha ............................................. 40 CFR 141.25(a). 

7110 D ................................. EPA Method 900.0 (USEPA 1980) ......... Gross alpha and gross beta .................... 40 CFR 141.25(a). 

7120 ..................................... 7120–97, online version (APHA 1997l) ... Gamma emitters (includes radioactive 

cesium and iodine).

40 CFR 141.25(a). 

7500-Cs B ............................ 7500-Cs B–00, online version (APHA 

2000l).

Radioactive Cesium and Gamma 

emitters.

40 CFR 141.25(a). 

7500-3H B ............................ 7500-3H B–00, online version (APHA 

2000m).

Tritium ...................................................... 40 CFR 141.25(a). 

7500–I B .............................. 7500–I B–00, online version (APHA 

2000n).

Radioactive Iodine and Gamma emitters 40 CFR 141.25(a). 

7500–I C,D .......................... 7500–I C,D–00, online versions (APHA 

2000n).

Radioactive Iodine ................................... 40 CFR 141.25(a). 

7500-Ra B,C ........................ 7500-Ra B,C–01, online versions (APHA 

2001c).

Radium-226 ............................................. 40 CFR 141.25(a). 

7500-Ra D ........................... 7500-Ra D–01, online version (APHA 

2001c).

Radium-228 ............................................. 40 CFR 141.25(a). 

7500-Ra E ........................... GA Method (2004) ................................... Radium-226 and Radium-228 ................. 40 CFR 141.25(a). 

7500-Sr B ............................ 7500-Sr B–01, online version (APHA 

2001d).

Strontium-89 and Strontium-90 ............... 40 CFR 141.25(a). 

7500–U B,C ......................... 7500–U B,C–00, online versions (APHA 

2000o).

Uranium ................................................... 40 CFR 141.25(a). 

9221 A,C .............................. 9221 A,C, 20th Edition, (APHA 1998) .... Total coliforms ......................................... 40 CFR 141.74(a)(1). 

9221 B ................................. 9221 B, 20th Edition, (APHA 1998) ........ Total coliforms ......................................... 40 CFR 141.74(a)(1) 40 

CFR 141.852(a)(5) [B.1, 

B.2, B.3, B.4]. 

9221 D ................................. 9221 D, 20th Edition, (APHA 1998) ........ Total coliforms ......................................... 40 CFR 141.852(a)(5) 

[D.1, D.2, D.3]. 

9221 E ................................. 9221 E, 20th Edition, (APHA 1998) ........ Fecal coliforms ........................................ 40 CFR 141.74(a)(1). 

9221 F ................................. 9221 F, 20th Edition, (APHA 1998) ........ E. coli ....................................................... 40 CFR 141.402(c)(2) 40 

CFR 141.852(a)(5) [F.1]. 

9222 A ................................. 9222 A 20th Edition, (APHA 1998) ......... Total coliforms ......................................... 40 CFR 141.74(a)(1). 

9222 B,C .............................. 9222 B,C, 20th Edition, (APHA 1998) .... Total coliforms ......................................... 40 CFR 141.74(a)(1) 40 

CFR 141.852(a)(5). 

9222 D ................................. 9222 D, 20th Edition, (APHA 1998) ........ Fecal coliforms ........................................ 40 CFR 141.74(a)(1). 

9222 H ................................. 9222 G, 20th Edition, (APHA 1998) ........ E. coli ....................................................... 40 CFR 141.852(a)(5). 

9222 I ................................... 9222 G, 20th Edition, (APHA 1998) ........ E. coli ....................................................... 40 CFR 141.402(c)(2) 40 

CFR 141.852(a)(5). 

9222 J .................................. m-ColiBlue24 Test (Hach Company 

1999).

Total coliforms ......................................... 40 CFR 141.852(a)(5). 

9222 J .................................. m-ColiBlue24 Test (Hach Company 

1999).

E. coli ....................................................... 40 CFR 141.402(c)(2) 40 

CFR 141.852(a)(5). 

9223 B ................................. 9223 B, 20th Edition (APHA 1998) ......... Total coliforms ......................................... 40 CFR 141.74(a)(1); 40 

CFR 141.852(a)(5). 


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Standard methods, 

24th edition 

(APHA 2023) 

Approved method Contaminant Regulation citations 

9223 B ................................. 9223 B, 20th Edition (APHA 1998) ......... E. coli ....................................................... 40 CFR 141.402(c)(2); 40 

CFR 141.852(a)(5). 

9230 B ................................. 9230 C, 20th Edition (APHA 1998) ......... Enterococci .............................................. 40 CFR 141.402(c)(2). 

9230 C ................................. 9230 C, 20th Edition (APHA 1998) ......... Enterococci .............................................. 40 CFR 141.402(c)(2). 

9230 D ................................. (Budnick 1996) ........................................ Enterococci .............................................. 40 CFR 141.402(c)(2). 

The 24th edition can be obtained from 

the American Public Health Association 

(APHA), 800 I Street NW, Washington, 

DC 20001–3710. Approved online 

versions are available at http://www.

standardmethods.org. 

B. Methods Developed by Vendors 

1. Hach Method 10312— 

Spectrophotometric Measurement of 

Fluoride in Finished Drinking Water 

Aluminum-Chromeazurol S complex 

(AL–CAS) Using Planar Reagent-filled 

Cuvettes (Hach 2022a). Hach Method 

10312 uses a reagent solution containing 

an intensely colored aluminumchromeazurol S complex. The presence 

of fluoride in the sample removes 

aluminum from the complex, releasing 

the free chromeazurol S ion. The free 

chromeazurol S ion has peak absorbance 

in a different region of the visible 

spectrum. The quantifiable change in 

absorbance is directly proportional to 

the fluoride concentration. Test results 

are measured at 427 nm using a 

colorimeter. 

Approved methods for fluoride are 

listed at 40 CFR 141.23(k)(1). The 

performance characteristics of Hach 

Method 10312 were compared to the 

performance characteristics of the 

approved Standard Methods 4500–F D 

(Standard Methods 1997i). The 

validation study report (Hach 2022b) 

summarizes the results obtained from 

three different facilities and 

laboratories. Method detection limits 

and method limits, precision and 

accuracy performance in high and low 

ionic strength water, and matrix spike 

studies were determined at all sites. 

EPA has determined that Hach 

Method 13012 is equally effective 

relative to Standard Methods 4500–F D. 

The basis for this determination is 

discussed in Adams 2023a. Therefore, 

EPA is approving the Hach Method 

10312 for determining fluoride in 

drinking water. A copy of the method is 

available from Hach Company, 5600 

Lindbergh Drive, Loveland, Colorado 

80539. 

2. Yokogawa Method 820— 

Measurement of Turbidity in Drinking 

Water by Right Angle Scattered Light 

Turbidity Analyzer (Yokogawa 2022a). 

Yokogawa Method 820 uses a rightangle scattering turbidimeter with an 

LED light source with a peak emitting 

wavelength between 650 and 670 nm. 

The method is based upon a comparison 

of the intensity of light scattered by the 

sample under defined conditions with 

the intensity of light scattered by a 

standard reference suspension. 

Approved methods for turbidity are 

listed at 40 CFR 141.74(a)(1). The 

performance characteristics of the 

Yokogawa Method 820 were compared 

to the performance characteristics of the 

approved EPA Method 180.1 (USEPA 

1993). The validation study report 

(Yokogawa 2022b) summarizes the 

results obtained from the turbidimeters 

tested at three different utilities. Method 

resolution, linearity, limits of detection, 

and precision and accuracy were 

determined at the first site, with 

subsequent sites evaluating precision 

and accuracy performance. 

EPA has determined that the 

Yokogawa Method 820 is equally 

effective relative to EPA Method 180.1. 

The basis for this determination is 

discussed in Adams 2023b. Therefore, 

EPA is approving the Yokogawa Method 

820 for determining turbidity in 

drinking water. A copy of the method is 

available from Yokogawa Electric 

Corporation, 2–9–32 Nakamachi, 

Musashino-shi, Tokyo, Japan 180–8750. 

IV. Statutory and Executive Order 

Reviews 

As noted in section II of this 

preamble, under the terms of SDWA 

section 1401(1), this streamlined 

method approval action is not a rule. 

Accordingly, the Congressional Review 

Act, 5 U.S.C. 801 et seq., as added by 

the Small Business Regulatory 

Enforcement Fairness Act of 1996, does 

not apply because this action is not a 

rule for purposes of 5 U.S.C. 804(3). 

Similarly, this action is not subject to 

the Regulatory Flexibility Act because it 

is not subject to notice and comment 

requirements under the Administrative 

Procedure Act or any other statute. In 

addition, because this approval action is 

not a rule, but simply makes alternative 

testing methods available as options for 

monitoring under SDWA, EPA has 

concluded that other statutes and 

executive orders generally applicable to 

rulemaking do not apply to this 

approval action. 

V. References 

Adams, W. 2023a. Memo to the record 

describing basis for expedited approval 

of Hach Method 10312. May 9, 2023. 

(Available at https://

www.regulations.gov; docket ID No. 

EPA–HQ–OW–2023–0541.) 

Adams, W. 2023b. Memo to the record 

describing basis for expedited approval 

of Yokogawa Method 820. May 9, 2023. 

(Available at https://

www.regulations.gov; docket ID No. 

EPA–HQ–OW–2023–0541.) 

American Public Health Association (APHA). 

1994. Standard Method 6251 B–94. 

Disinfection By-Products: Haloacetic 

Acids and Trichlorophenol. B. Micro 

Liquid-Liquid Extraction Gas 

Chromatographic Method. Approved by 

Standard Methods Committee 1994. 

Standard Methods Online (Available at 

https://www.standardmethods.org) 

American Public Health Associate (APHA). 

1995. 19th Edition of Standard Methods 

for the Examination of Water and 

Wastewater. American Public Health 

Association, 800 I Street NW, 

Washington, DC 20001–3710. 

American Public Health Association (APHA). 

1997a. Standard Method 2150 B–97. 

Odor. B. Threshold Odor Test. Approved 

by Standard Methods Committee 1997. 

Standard Methods Online (Available at 

https://www.standardmethods.org) 

American Public Health Association (APHA). 

1997b. Standard Method 2320 B–97. 

Alkalinity. B. Titration Method. 

Approved by Standard Methods 

Committee 1997. Standard Methods 

Online (Available at https://www.

standardmethods.org) 

American Public Health Association (APHA). 

1997c. Standard Method 2510 B–97. 

Conductivity. B. Laboratory Method. 

Approved by Standard Methods 

Committee 1997. Standard Methods 

Online (Available at https://www.

standardmethods.org) 

American Public Health Association (APHA). 

1997d. Standard Method 2540 C–97. 

Solids. C. Total Dissolved Solids Dried at 

180 °C. Approved by Standard Methods 

Committee 1997. Standard Methods 

Online (Available at https://www.

standardmethods.org) 

American Public Health Association (APHA). 

1997e. Standard Method 3114 B–97. 

Arsenic and Selenium by Hydride 

Generation/Atomic Emission 

Spectrometry. B. Manual Hydride 

Generation/Atomic Absorption 


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Spectrometric Method. Approved by 

Standard Methods Committee 1997. 

Standard Methods Online (Available at 

https://www.standardmethods.org) 

American Public Health Association (APHA). 

1997f. Standard Method 3500-Ca B–97. 

Calcium. B. EDTA Titrimetric Method. 

Approved by Standard Methods 

Committee 1997. Standard Methods 

Online (Available at https://www.

standardmethods.org) 

American Public Health Association (APHA). 

1997g. Standard Method 3500-Mg B–97. 

Magnesium. B. Calculation Method. 

Approved by Standard Methods 

Committee 1997. Standard Methods 

Online (Available at https://www.

standardmethods.org) 

American Public Health Association (APHA). 

1997h. Standard Methods 4500-Cl¥B, D– 

97. Chloride. B. Argentometric Method. 

D. Potentiometric Method. Approved by 

Standard Methods Committee 1997. 

Standard Methods Online (Available at 

https://www.standardmethods.org) 

American Public Health Association (APHA). 

1997i. Standard Methods 4500–F¥B, C, 

D, E–97. Fluoride. B. Preliminary 

Distillation Step. C. Ion-Selective 

Electrode Method. D. SPADNS Method. 

E. Complexone Method. Approved by 

Standard Methods Committee 1997. 

Standard Methods Online (Available at 

https://www.standardmethods.org) 

American Public Health Association (APHA). 

1997j. Standard Method 4500–O3 B–97. 

Ozone (Residual). B. Indigo Colorimetric 

Method. Approved by Standard Methods 

Committee 1997. Standard Methods 

Online (Available at https://

www.standardmethods.org) 

American Public Health Association (APHA). 

1997k. Standard Methods 4500-SiO2 C, 

D, E–97. Silica. C. Molybdosilicate 

Method. D. Heteropoly Blue Method. E. 

Automated Method for MolybdateReactive Silica. Approved by Standard 

Methods Committee 1997. Standard 

Methods Online (Available at https://

www.standardmethods.org) 

American Public Health Association (APHA). 

1997l. Standard Method 7120 B–97. 

Gamma-Emitting Radionuclides. B. 

Gamma Spectroscopic Method. 

Approved by Standard Methods 

Committee 1997. Standard Methods 

Online (Available at https://www.

standardmethods.org) 

American Public Health Association (APHA). 

1998. 20th Edition of Standard Methods 

for the Examination of Water and 

Wastewater. American Public Health 

Association, 800 I Street NW, 

Washington, DC 20001–3710. 

American Public Health Association (APHA). 

1999a. Standard Methods 3111 B, D–99. 

Metals by Flame Atomic Absorption 

Spectrometry. B. Direct Air-Acetylene 

Flame Method. D. Direct Nitrous OxideAcetylene Flame Method. Approved by 

Standard Methods Committee 1999. 

Standard Methods Online (Available at 

https://www.standardmethods.org) 

American Public Health Association (APHA). 

1999b. Standard method 3112 B–99. 

Metals by Cold-Vapor Atomic 

Absorption Spectrometry. B. Cold-Vapor 

Spectrometric Method. Approved by 

Standard Methods Committee 1999. 

Standard Methods Online (Available at 

https://www.standardmethods.org) 

American Public Health Association (APHA). 

1999c. Standard Method 3120 B–99. 

Metals by Plasma Emission 

Spectroscopy. B. Inductively Coupled 

Plasma (ICP) Method. Approved by 

Standard Methods Committee 1999. 

Standard Methods Online (Available at 

https://www.standardmethods.org) 

American Public Health Association (APHA). 

1999d. Standard Method 4500–CN–C– 

99. Cyanide. C. Total Cyanide after 

Distillation. Approved by Standard 

Methods Committee 1999. Standard 

Methods Online (Available at https://

www.standardmethods.org) 

American Public Health Association (APHA). 

2000a. Standard Method 2550–00. 

Temperature. Approved by Standard 

Methods Committee 2000. Standard 

Methods Online (Available at https://

www.standardmethods.org) 

American Public Health Association (APHA). 

2000b. Standard Method 4110 B–00. 

Determination of Anions by Ion 

Chromatography. B. Ion Chromatography 

with Chemical Suppression of Eluent 

Conductivity. Approved by Standard 

Methods Committee 2000. Standard 

Methods Online (Available at https://

www.standardmethods.org) 

American Public Health Association (APHA). 

2000c. Standard Methods 4500–Cl D, E, 

F, G, H, I–00. Chlorine (Residual). D. 

Amperometric Titration Method. E. LowLevel Amperometric Titration Method. 

F. DPD Ferrous Titrimetric Method. G. 

DPD Colorimetric Method. H. 

Syringaldehyde (FACTS) Method. I. 

Iodometric Electrode Technique. 

Approved by Standard Methods 

Committee 2000. Standard Methods 

Online (Available at https://www.

standardmethods.org) 

American Public Health Association (APHA). 

2000d. Standard Methods 4500–ClO2 C, 

E–00. Chlorine Dioxide. C. 

Amperometric Method I. E. 

Amperometric Method II. Approved by 

Standard Methods Committee 2000. 

Standard Methods Online (Available at 

https://www.standardmethods.org) 

American Public Health Association (APHA). 

2000e. Standard Method 4500–H+ B–00. 

pH Value. B. Electrometric Method. 

Approved by Standard Methods 

Committee 2000. Standard Methods 

Online (Available at https://www.

standardmethods.org) 

American Public Health Association (APHA). 

2000f. Standard Methods 4500–NO3–D, 

E, F–00. Nitrogen (Nitrate). D. Nitrate 

Electrode Method. E. Cadmium 

Reduction Method. F. Automated 

Cadmium Reduction Method. Approved 

by Standard Methods Committee 2000. 

Standard Methods Online (Available at 

https://www.standardmethods.org) 

American Public Health Association (APHA). 

2000g. Standard Method 4500–NO2–B– 

00. Nitrogen (Nitrite). B. Colorimetric 

Method. Approved by Standard Methods 

Committee 2000. Standard Methods 

Online (Available at https://www.

standardmethods.org) 

American Public Health Association (APHA). 

2000h. Standard Methods 5310 B, C–00. 

Total Organic Carbon (TOC). B. High 

Temperature Combustion Method. C. 

Persulfate-Ultraviolet or Heated 

Persulfate Oxidation Method. Approved 

by Standard Methods Committee 2000. 

Standard Methods Online (Available at 

https://www.standardmethods.org) 

American Public Health Association (APHA). 

2000i. Standard Method 5540 C–00. 

Surfactants. C. Anionic Surfactants as 

MBAs. Approved by Standard Methods 

Committee 2000. Standard Methods 

Online (Available at https://www.

standardmethods.org) 

American Public Health Association (APHA). 

2000j. Standard Method 5910 B–00. UVAbsorbing Organic Constituents. B. 

Ultraviolet Absorption Method. 

Approved by Standard Methods 

Committee 2000. Standard Methods 

Online (Available at https://

www.standardmethods.org) 

American Public Health Association (APHA). 

2000k. Standard Methods 7110 B,C–00. 

Gross Alpha and Gross Beta 

Radioactivity (Total, Suspended, and 

Dissolved). B. Evaporation Method for 

Gross Alpha-Beta. C. Coprecipitation 

Method for Alpha Radioactivity in 

Drinking Water. Approved by Standard 

Methods Committee 2000. Standard 

Methods Online (Available at https://

www.standardmethods.org) 

American Public Health Association (APHA). 

2000l. Standard Method 7500–Cs B–00. 

Radioactive Cesium. B. Precipitation 

Method. Approved by Standard Methods 

Committee 2000. Standard Methods 

Online (Available at https://www.

standardmethods.org) 

American Public Health Association (APHA). 

2000m. Standard Method 7500–3H B–00. 

Tritium. Liquid Scintillation 

Spectrometric Method. Approved by 

Standard Methods Committee 2000. 

Standard Methods Online (Available at 

https://www.standardmethods.org) 

American Public Health Association (APHA). 

2000n. Standard Methods 7500–I B, C, 

D–00. Radioactive Iodine. B. 

Precipitation Method. C. Ion-Exchange 

Method. D. Distillation Method. 

Approved by Standard Methods 

Committee 2000. Standard Methods 

Online (Available at https://www.

standardmethods.org) 

American Public Health Association (APHA). 

2000o. Standard Methods 7500–U B, C– 

00. Uranium. B. Radiochemical Method. 

C. Isotopic Method. Approved by 

Standard Methods Committee 2000. 

Standard Methods Online (Available at 

https://www.standardmethods.org) 

American Public Health Association (APHA). 

2001a. Standard Method 2120 B–01. 

Color. B. Visual Comparison Method. 

Approved by Standard Methods 

Committee 2001. Standard Methods 

Online (Available at https://www.

standardmethods.org) 

American Public Health Association (APHA). 

2001b. Standard Method 2130 B–01. 


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Turbidity. B. Nephelometric Method. 

Approved by Standard Methods 

Committee 2001. Standard Methods 

Online (Available at https://www.

standardmethods.org) 

American Public Health Association (APHA). 

2001c. Standard Methods 7500–Ra B, C, 

D, E–01. Radium. B. Precipitation 

Method. C. Emanation Method. D. 

Sequential Precipitation. E. Gamma 

Spectroscopy Method. Approved by 

Standard Methods Committee 2001. 

Standard Methods Online (Available at 

https://www.standardmethods.org) 

American Public Health Association (APHA). 

2001d. Standard Method 7500–Sr B–01. 

Total Radioactive Strontium and 

Strontium-90. B. Precipitation Method. 

Approved by Standard Methods 

Committee 2000. Standard Methods 

Online (Available at https://www.

standardmethods.org) 

American Public Health Association (APHA). 

2023. 24th Edition of Standard Methods 

for the Examination of Water and 

Wastewater. American Public Health 

Association, 800 I Street NW, 

Washington, DC 20001–3710. 

ASTM International. 1997. ASTM D 3454–97. 

Standard Test Method for Radium-226 in 

Water. ASTM International, 100 Barr 

Harbor Drive, West Conshohocken, PA 

19428–2959. (Available at https://

www.astm.org.) 

ASTM International. 2021. ASTM D 3454–21. 

Standard Test Method for Radium-226 in 

Water. ASTM International, 100 Barr 

Harbor Drive, West Conshohocken, PA 

19428–2959. (Available at https://

www.astm.org.) 

Best, J. 2023. Memo to the record describing 

basis for expedited approval of methods 

in the 24th edition of Standard Methods 

for the Examination of Water and 

Wastewater. August 10, 2023. (Available 

at https://www.regulations.gov; docket ID 

No. EPA–HQ–OW–2023–0541.) 

Budnick. 1996. Evaluation of Enterolert for 

Enumeration of Enterococci in 

Recreational Waters, Applied and 

Environmental Microbiology, October 

1996, p. 3881–3884. 

GA. 2004. Method for the Determination of 

Radium-228 and Radium-226 in 

Drinking Water by Gamma-ray 

Spectrometry using HPGE or Ge(Li) 

Detectors. December 2004. Revision 1.2. 

Environmental Resource Center, Georgia 

Institute for Technology, 620 Cherry 

Street, Atlanta, Georgia 30332–0335. 

(Available at https://

www.regulations.gov; docket ID No. 

EPA–HQ–OW–2023–0541.) 

Hach Company. 2022a. Hach Method 10312. 

Spectrophotometric Measurement of 

Fluoride in Finished Drinking Water 

Aluminum-Chromeazurol S complex 

(AL–CAS) Using Planar Reagent-filled 

Cuvettes. August 2022. Revision 1.0. 

Hach Company, 5600 Lindbergh Drive, 

Loveland, Colorado 80539. (Available at 

https://www.regulations.gov; docket ID 

No. EPA–HQ–OW–2023–0541.) 

Hach Company. 2022b. Alternate Test 

Procedure (ATP) Validation Study 

Report of Hach Method 10312 for the 

Determination of Fluoride in Finished 

Drinking Water Using Planar Reagentfilled Cuvettes. August 2022. Hach 

Company, 5600 Lindbergh Drive, 

Loveland, Colorado 80539. (Available at 

https://www.regulations.gov; docket ID 

No. EPA–HQ–OW–2023–0541.) 

Hach Company. 1999. Total Coliforms and E. 

coli Membrane Filtration Method mColiBlue24® Broth. August 1999. 

Revision 2. Hach Company, 5600 

Lindbergh Drive, P.O. Box 389, 

Loveland, CO 80539. (Available at 

https://www.regulations.gov; docket ID 

No. EPA–HQ–OW–2023–0541.) 

Smith, G. 2023. Memo to the record 

describing basis for expedited approval 

of updated method from ASTM 

International. April 2023. (Available at 

https://www.regulations.gov; docket ID 

No. EPA–HQ–OW–2023–0541.) 

Smith, G. and Wendelken, S. 2023. Memo to 

the record describing basis for expedited 

approval of methods in the 24th edition 

of Standard Methods for the 

Examination of Water and Wastewater. 

June 2023. (Available at https://

www.regulations.gov; docket ID No. 

EPA–HQ–OW–2023–0541.) 

USEPA. 1980. EPA Method 904.0. Radium228 in Drinking Water in ‘‘Prescribed 

Procedures for Measurement of 

Radioactivity in Drinking Water,’’ EPA– 

600/4–80–032, August 1980. (Available 

at https://www.regulations.gov; docket ID 

No. EPA–HQ–OW–2023–0541.) 

USEPA. 1993. EPA Method 180.1, Revision 

2.0. Determination of Turbidity by 

Nephelometry in ‘‘Methods for the 

Determination of Inorganic Substances in 

Environmental Samples,’’ EPA/600/R– 

93/100, August 1993. (Available at 

https://www.regulations.gov; docket ID 

No. EPA–HQ–OW–2023–0541.) 

USEPA. 2000. EPA Method 515.4, Revision 

1.0. Determination of Chlorinated Acids 

in Drinking Water by Liquid-Liquid 

Microextraction, Derivatization and Fast 

Gas Chromatography with Electron 

Capture Detection. EPA/815/B–00/001. 

April 2000. (Available at https://

www.regulations.gov; docket ID No. 

EPA–HQ–OW–2023–0541 and at https:// 

www.nemi.gov.) 

USEPA. 2001. EPA Method 531.2, Revision 

1.0. Measurement of Nmethylcarbamoyloximes and Nmethylcarbamates in Water by Direct 

Aqueous Injection HPLC with 

Postcolumn Derivatization. EPA 815–B– 

01–002. September 2001. (Available at 

https://www.regulations.gov; docket ID 

No. EPA–HQ–OW–2023–0541 and at 

https://www.nemi.gov.) 

Yokogawa Electric Corporation. 2022a. 

Yokogawa Method 820. Measurement of 

Turbidity in Drinking Water by Right 

Angle Scattered Light Turbidity 

Analyzer. November 30, 2022. Revision 

1.0. Yokogawa Electric Corporation, 2–9– 

32 Nakamachi, Musashino-shi, Tokyo, 

Japan 180–8750. (Available at https://

www.regulations.gov; docket ID No. 

EPA–HQ–OW–2023–0541.) 

Yokogawa Electric Corporation. 2022b. 

Alternate Test Procedure (ATP) 

Validation Study Report of Yokogawa 

Method 820 for the Measurement of 

Turbidity in Drinking Water by Right 

Angle Scattered Light Turbidity 

Analyzer. November 8, 2022. Yokogawa 

Electric Corporation, 2–9–32 Nakamachi, 

Musashino-shi, Tokyo, Japan 180–8750. 

(Available at https://

www.regulations.gov; docket ID No. 

EPA–HQ–OW–2023–0541.) 

List of Subjects in 40 CFR Part 141 

Environmental protection, Chemicals, 

Indians—lands, Intergovernmental 

relations, Reporting and recordkeeping 

requirements, Water supply. 

Jennifer L. McLain, 

Director, Office of Ground Water and Drinking 

Water. 

For the reasons stated in the 

preamble, the Environmental Protection 

Agency amends 40 CFR part 141 as 

follows: 

PART 141—NATIONAL PRIMARY 

DRINKING WATER REGULATIONS 

■ 1. The authority citation for part 141 

continues to read as follows: 

Authority: 42 U.S.C. 300f, 300g–1, 300g– 

2, 300g–3, 300g–4, 300g–5, 300g–6, 300j–4, 

300j–9, and 300j–11. 

■ 2. Amend Appendix A to subpart C of 

part 141 by: 

■ a. Revising the table entitled 

‘‘Alternative Testing Methods for 

Contaminants Listed at 40 CFR 

141.23(k)(1)’’; 

■ b. Revising the table entitled 

‘‘Alternative Testing Methods for 

Contaminants Listed at 40 CFR 

141.24(e)(1)’’; 

■ c. Revising the table entitled 

‘‘Alternative Testing Methods for 

Contaminants Listed at 40 CFR 

141.25(a)’’; 

■ d. Revising the table entitled 

‘‘Alternative Testing Methods for 

Contaminants Listed at 40 CFR 

141.74(a)(1)’’; 

■ e. Revising the table entitled 

‘‘Alternative Testing Methods for 

Disinfectant Residuals Listed at 40 CFR 

141.74(a)(2)’’; 

■ f. Revising the table entitled 

‘‘Alternative Testing Methods for 

Contaminants Listed at 40 CFR 

141.131(b)(1)’’; 

■ g. Revising the table entitled 

‘‘Alternative Testing Methods for 

Disinfectant Residuals Listed at 40 CFR 

141.131(c)(1)’’; 

■ h. Revising the table entitled 

‘‘Alternative Testing Methods for 

Parameters Listed at 40 CFR 

141.131(d)’’; 

■ i. Revising the table entitled 

‘‘Alternative Testing Methods for 

Contaminants Listed at 40 CFR 

141.402(c)(2)’’; 


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■ j. Revising the table entitled 

‘‘Alternative Testing Methods for 

Contaminants Listed at 40 CFR 

141.852(a)(5)’’; 

■ k. Revising the table entitled 

‘‘Alternative Testing Methods for 

Contaminants Listed at 40 CFR 

143.4(b)’’; 

The revisions and additions read as 

follows: 

Appendix A to Subpart C of Part 141— 

Alternative Testing Methods Approved 

for Analyses Under the Safe Drinking 

Water Act 

* * * * * 

ALTERNATIVE TESTING METHODS FOR CONTAMINANTS LISTED AT 40 CFR 141.23(k)(1) 

Contaminant Methodology EPA method SM 21st 

edition 1

SM 22nd 

edition 28

SM 23rd 

edition,49 SM 

24th edition 66

SM online 3 ASTM 4 Other 

Alkalinity ............... Titrimetric ........ ......................... 2320 B ............. 2320 B ............. 2320 B ............. ......................... D1067–06 B, 

11 B, 16 B.

Antimony .............. Hydride—Atomic Absorption.......................... ......................... ......................... ......................... ......................... D 3697–07, 

–12, –17.

Atomic Absorption; Furnace.......................... 3113 B ............. 3113 B ............. 3113 B ............. 3113 B–04, B– 

10.

Axially viewed 

inductively 

coupled plasma-atomic 

emission 

spectrometry 

(AVICP– 

AES).

200.5, Revision 

4.2 2.

Arsenic ................. Atomic Absorption; Furnace.......................... 3113 B ............. 3113 B ............. 3113 B ............. 3113 B–04, B– 

10.

D 2972–08 C, 

–15 C.

Hydride Atomic 

Absorption.

......................... 3114 B ............. 3114 B ............. 3114 B ............. 3114 B–09 ....... D 2972–08 B, 

–15 B.

Axially viewed 

inductively 

coupled plasma-atomic 

emission 

spectrometry 

(AVICP– 

AES).

200.5, Revision 

4.2 2.

Barium ................. Inductively 

Coupled 

Plasma.

......................... 3120 B ............. 3120 B ............. 3120 B.

Atomic Absorption; Direct.......................... 3111 D ............ 3111 D ............ 3111 D.

Atomic Absorption; Furnace.......................... 3113 B ............. 3113 B ............. 3113 B ............. 3113 B–04, B– 

10.

Axially viewed 

inductively 

coupled plasma-atomic 

emission 

spectrometry 

(AVICP– 

AES).

200.5, Revision 

4.2 2.

Beryllium .............. Inductively 

Coupled 

Plasma.

......................... 3120 B ............. 3120 B ............. 3120 B.

Atomic Absorption; Furnace.......................... 3113 B ............. 3113 B ............. 3113 B ............. 3113 B–04, B– 

10.

D 3645–08 B, 

–15 B.

Axially viewed 

inductively 

coupled plasma-atomic 

emission 

spectrometry 

(AVICP– 

AES).

200.5, Revision 

4.2 2.

Cadmium ............. Atomic Absorption; Furnace.......................... 3113 B ............. 3113 B ............. 3113 B ............. 3113 B–04, B– 

10.

Axially viewed 

inductively 

coupled plasma-atomic 

emission 

spectrometry 

(AVICP– 

AES).

200.5, Revision 

4.2 2.

Calcium ................ EDTA titrimetric ......................... 3500-Ca B ....... 3500-Ca B ....... 3500-Ca B ....... ......................... D 511–09, –14 

A.

Atomic Absorption; Direct 

Aspiration.

......................... 3111 B ............. 3111 B ............. 3111 B ............. ......................... D 511–09, –14 

B.


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ALTERNATIVE TESTING METHODS FOR CONTAMINANTS LISTED AT 40 CFR 141.23(k)(1)—Continued 

Contaminant Methodology EPA method SM 21st 

edition 1

SM 22nd 

edition 28

SM 23rd 

edition,49 SM 

24th edition 66

SM online 3 ASTM 4 Other 

Inductively 

Coupled 

Plasma.

......................... 3120 B ............. 3120 B ............. 3120 B.

Axially viewed 

inductively 

coupled plasma-atomic 

emission 

spectrometry 

(AVICP– 

AES).

200.5, Revision 

4.2 2.

Ion Chromatography.......................... ......................... ......................... ......................... ......................... D 6919–09, 

–17.

Chromium ............ Inductively 

Coupled 

Plasma.

......................... 3120 B ............. 3120 B ............. 3120 B.

Atomic Absorption; Furnace.......................... 3113 B ............. 3113 B ............. 3113 B ............. 3113 B–04, B– 

10.

Axially viewed 

inductively 

coupled plasma-atomic 

emission 

spectrometry 

(AVICP– 

AES).

200.5, Revision 

4.2 2.

Copper ................. Atomic Absorption; Furnace.......................... 3113 B ............. 3113 B ............. 3113 B ............. 3113 B–04, B– 

10.

D 1688–07, 

–12 C, 17 C.

Atomic Absorption; Direct 

Aspiration.

......................... 3111 B ............. 3111 B ............. 3111 B ............. ......................... D 1688–07, 

–12 A, 17 A.

Inductively 

Coupled 

Plasma.

......................... 3120 B ............. 3120 B ............. 3120 B.

Axially viewed 

inductively 

coupled plasma-atomic 

emission 

spectrometry 

(AVICP– 

AES).

200.5, Revision 

4.2 2.

Colorimetry ...... ......................... ......................... ......................... ......................... ......................... ......................... Hach Method 

8026,35 Hach 

Method 

10272.36

Conductivity ......... Conductance ... ......................... 2510 B ............. 2510 B ............. 2510 B ............. ......................... D 1125–14 A.

Cyanide ................ Manual Distillation with 

MgCl2 followed by:.

......................... 4500–CN¥C .... 4500–CN¥C .... 4500–CN¥C .... 4500–CN¥C– 

99.

D 2036–06 A.

Spectrophotometric, Amenable.......................... 4500–CN¥G ... 4500–CN¥G ... 4500–CN¥G ... ......................... D 2036–06 B.

Spectrophotometric Manual.......................... 4500–CN¥E .... 4500–CN¥E .... 4500–CN¥E .... ......................... D2036–06 A.

Selective Electrode.......................... 4500–CN¥F .... 4500–CN¥F .... 4500–CN¥F.

Gas Chromatography/ 

Mass Spectrometry 

Headspace.

......................... ......................... ......................... ......................... ......................... ......................... ME355.01.7

Fluoride ................ Ion Chromatography.......................... 4110 B ............. 4110 B ............. 4110 B ............. ......................... D 4327–11, 

–17.

Manual Distillation; Colorimetric 

SPADNS.

......................... 4500–F¥B, D .. 4500–F¥B, D .. 4500–F¥B, D.

Manual Electrode.......................... 4500–F¥C ....... 4500–F¥C ....... 4500–F¥C ....... ......................... D 1179–04, 10 

B, 16 B.

Automated Alizarin.......................... 4500–F¥E ....... 4500–F¥E ....... 4500–F¥E.

Arsenite-Free 

Colorimetric 

SPADNS.

......................... ......................... ......................... ......................... ......................... ......................... Hach SPADNS 

2 Method 

10225,22

Hach Method 

10312.67


khammond on DSKJM1Z7X2PROD with RULES
5782 Federal Register / Vol. 89, No. 20 / Tuesday, January 30, 2024 / Rules and Regulations 

ALTERNATIVE TESTING METHODS FOR CONTAMINANTS LISTED AT 40 CFR 141.23(k)(1)—Continued 

Contaminant Methodology EPA method SM 21st 

edition 1

SM 22nd 

edition 28

SM 23rd 

edition,49 SM 

24th edition 66

SM online 3 ASTM 4 Other 

Lead ..................... Atomic Absorption; Furnace.......................... 3113 B ............. 3113 B ............. 3113 B ............. 3113 B–04, B– 

10.

D 3559–08 D, 

15 D.

Axially viewed 

inductively 

coupled plasma-atomic 

emission 

spectrometry 

(AVICP– 

AES).

200.5, Revision 

4.2 2.

Differential 

Pulse Anodic 

Stripping 

Voltametry.

......................... ......................... ......................... ......................... ......................... ......................... Method 1001, 

Rev. 1.1.57

Magnesium .......... Atomic Absorption.......................... 3111 B ............. 3111 B ............. 3111 B ............. ......................... D 511–09, –14 

B.

Inductively 

Coupled 

Plasma.

......................... 3120 B ............. 3120 B ............. 3120 B.

Complexation 

Titrimetric 

Methods.

......................... 3500-Mg B ...... 3500-Mg B ...... 3500-Mg B ...... ......................... D 511–09, –14 

A.

Axially viewed 

inductively 

coupled plasma-atomic 

emission 

spectrometry 

(AVICP– 

AES).

200.5, Revision 

4.2 2.

Ion Chromatography.......................... ......................... ......................... ......................... ......................... D 6919–09, 

–17.

Mercury ................ Manual, Cold 

Vapor.

......................... 3112 B ............. 3112 B ............. 3112 B ............. 3112 B–09 ....... D 3223–12, 

–17.

Nickel ................... Inductively 

Coupled 

Plasma.

......................... 3120 B ............. 3120 B ............. 3120 B.

Atomic Absorption; Direct.......................... 3111 B ............. 3111 B ............. 3111 B.

Atomic Absorption; Furnace.......................... 3113 B ............. 3113 B ............. 3113 B ............. 3113 B–04, B– 

10.

Axially viewed 

inductively 

coupled plasma-atomic 

emission 

spectrometry 

(AVICP– 

AES).

200.5, Revision 

4.2 2.

Nitrate .................. Ion Chromatography.......................... 4110 B ............. 4110 B ............. 4110 B ............. ......................... D 4327–11, 

–17.

Automated 

Cadmium 

Reduction.

......................... 4500–NO3

¥F .. 4500–NO3¥F .. 4500–NO3¥F.

Manual Cadmium Reduction.......................... 4500–NO3

¥ E 4500–NO3¥ E 4500–NO3¥ E.

Ion Selective 

Electrode.

......................... 4500–NO3

¥ D 4500–NO3¥ D 4500–NO3¥ D.

Reduction/Colorimetric.......................... ......................... ......................... ......................... ......................... ......................... Systea Easy (1- 

Reagent),8

NECi NitrateReductase.40

Colorimetric; Direct.......................... ......................... ......................... ......................... ......................... ......................... Hach 

TNTplusTM

835/836 

Method 

10206.23

Capillary Ion 

Electrophoresis.

......................... ......................... ......................... ......................... ......................... D 6508–15.

Nitrite ................... Ion Chromatography.......................... 4110 B ............. 4110 B ............. 4110 B ............. ......................... D 4327–11, 

–17.

Automated 

Cadmium 

Reduction.

......................... 4500–NO3

¥F .. 4500–NO3¥F .. 4500–NO3¥F.

Manual Cadmium Reduction.......................... 4500–NO3

¥E .. 4500–NO3¥E .. 4500–NO3¥E.


khammond on DSKJM1Z7X2PROD with RULES
Federal Register / Vol. 89, No. 20 / Tuesday, January 30, 2024 / Rules and Regulations 5783 

ALTERNATIVE TESTING METHODS FOR CONTAMINANTS LISTED AT 40 CFR 141.23(k)(1)—Continued 

Contaminant Methodology EPA method SM 21st 

edition 1

SM 22nd 

edition 28

SM 23rd 

edition,49 SM 

24th edition 66

SM online 3 ASTM 4 Other 

Spectrophotometric.......................... 4500–NO2

¥B .. 4500–NO2¥B .. 4500–NO2¥B.

Reduction/Colorimetric.......................... ......................... ......................... ......................... ......................... ......................... Systea Easy (1- 

Reagent),8

NECi NitrateReductase.40

Capillary Ion 

Electrophoresis.

......................... ......................... ......................... ......................... ......................... D 6508–15.

Ortho-phosphate .. Ion Chromatography.......................... 4110 B ............. 4110 B ............. 4110 B ............. ......................... D 4327–11, 

–17.

Colorimetric, 

ascorbic acid, 

single reagent.

......................... 4500–P E ........ 4500–P E ........ 4500–P E ........ 4500–P E–99.

Colorimetric, 

Automated, 

Ascorbic Acid.

......................... 4500–P F ........ 4500–P F ........ 4500–P F ........ 4500–P F–99 .. Thermo Fisher 

Discrete Analyzer.41.

Capillary Ion 

Electrophoresis.

......................... ......................... ......................... ......................... ......................... D 6508–15.

pH ........................ Electrometric ... 48 150.3 ............ 4500–H+ B ...... 4500–H+ B ...... 4500–H+ B ...... ......................... D 1293–12, 

–18.

Selenium .............. Hydride-Atomic 

Absorption.

......................... 3114 B ............. 3114 B ............. 3114 B ............. 3114 B–09 ....... D 3859–08 A, 

–15 A.

Atomic Absorption; Furnace.......................... 3113 B ............. 3113 B ............. 3113 B ............. 3113 B–04, B– 

10.

D 3859–08 B, 

–15 B.

Axially viewed 

inductively 

coupled plasma-atomic 

emission 

spectrometry 

(AVICP– 

AES).

200.5, Revision 

4.2 2.

Silica .................... Colorimetric ..... ......................... ......................... ......................... ......................... ......................... D859–05, 10, 

16.

Molybdosilicate ......................... 4500-SiO2 C .... 4500-SiO2 C .... 4500-SiO2 C.

Heteropoly blue ......................... 4500-SiO2 D .... 4500-SiO2 D .... 4500-SiO2 D.

Automated for 

Molybdate-reactive Silica.

......................... 4500-SiO2 E .... 4500-SiO2 E .... 4500-SiO2 E.

Axially viewed 

inductively 

coupled plasma-atomic 

emission 

spectrometry 

(AVICP– 

AES).

200.5, Revision 

4.2 2.

Inductively 

Coupled 

Plasma.

......................... 3120 B ............. 3120 B ............. 3120 B.

Sodium ................. Atomic Absorption; Direct 

Aspiration.

......................... 3111 B ............. 3111 B ............. 3111 B.

Axially viewed 

inductively 

coupled plasma-atomic 

emission 

spectrometry 

(AVICP– 

AES).

200.5, Revision 

4.2 2.

Ion Chromatography.......................... ......................... ......................... ......................... ......................... D 6919–09, 

–17.

Temperature ........ Thermometric .. ......................... 2550 ................ 2550 ................ 2550 ................ 2550–10.


khammond on DSKJM1Z7X2PROD with RULES
5784 Federal Register / Vol. 89, No. 20 / Tuesday, January 30, 2024 / Rules and Regulations 

ALTERNATIVE TESTING METHODS FOR CONTAMINANTS LISTED AT 40 CFR 141.24(e)(1) 

Contaminant Methodology EPA method SM 21st edition 1

SM 22nd 

edition,28 SM 

23rd edition,49 SM 

24th edition 66

SM online 3 ASTM 4 Other 

Benzene ............... Purge &Trap/Gas 

Chromatography/Mass 

Spectrometry.

524.3,9 524.4.29

Carbon tetrachloride.Purge &Trap/Gas 

Chromatography/Mass 

Spectrometry.

524.3,9 524.4.29

Chlorobenzene ..... Purge &Trap/Gas 

Chromatography/Mass 

Spectrometry.

524.3,9 524.4.29

1,2- 

Dichlorobenzene.

Purge &Trap/Gas 

Chromatography/Mass 

Spectrometry.

524.3,9 524.4.29

1,4- 

Dichlorobenzene.

Purge &Trap/Gas 

Chromatography/Mass 

Spectrometry.

524.3,9 524.4.29

1,2-Dichloroethane Purge &Trap/Gas 

Chromatography/Mass 

Spectrometry.

524.3,9 524.4.29

cisDichloroethylene.Purge &Trap/Gas 

Chromatography/Mass 

Spectrometry.

524.3,9 524.4.29

transDichloroethylene.Purge &Trap/Gas 

Chromatography/Mass 

Spectrometry.

524.3,9 524.4.29

Dichloromethane ... Purge &Trap/Gas 

Chromatography/Mass 

Spectrometry.

524.3,9 524.4.29

1,2- 

Dichloropropane.

Purge &Trap/Gas 

Chromatography/Mass 

Spectrometry.

524.3,9 524.4.29

Ethylbenzene ........ Purge &Trap/Gas 

Chromatography/Mass 

Spectrometry.

524.3,9 524.4.29

Styrene ................. Purge &Trap/Gas 

Chromatography/Mass 

Spectrometry.

524.3,9 524.4 29.

Tetrachloroethylene.Purge &Trap/Gas 

Chromatography/Mass 

Spectrometry.

524.3,9 524.4.29

1,1,1-Trichloroethane.Purge &Trap/Gas 

Chromatography/Mass 

Spectrometry.

524.3,9 524.4.29

Trichloroethylene .. Purge &Trap/Gas 

Chromatography/Mass 

Spectrometry.

524.3,9 524.4.29

Toluene ................. Purge &Trap/Gas 

Chromatography/Mass 

Spectrometry.

524.3,9 524.4.29

1,2,4- 

Trichlorobenzene.

Purge &Trap/Gas 

Chromatography/Mass 

Spectrometry.

524.3,9 524.4.29

1,1- 

Dichloroethylene.

Purge &Trap/Gas 

Chromatography/Mass 

Spectrometry.

524.3,9 524.4 29.

1,1,2- 

Trichlorethane.

Purge &Trap/Gas 

Chromatography/Mass 

Spectrometry.

524.3,9 524.4.29


khammond on DSKJM1Z7X2PROD with RULES
Federal Register / Vol. 89, No. 20 / Tuesday, January 30, 2024 / Rules and Regulations 5785 

ALTERNATIVE TESTING METHODS FOR CONTAMINANTS LISTED AT 40 CFR 141.24(e)(1)—Continued 

Contaminant Methodology EPA method SM 21st edition 1

SM 22nd 

edition,28 SM 

23rd edition,49 SM 

24th edition 66

SM online 3 ASTM 4 Other 

Vinyl chloride ........ Purge &Trap/Gas 

Chromatography/Mass 

Spectrometry.

524.3,9 524.4.29

Xylenes (total) ....... Purge &Trap/Gas 

Chromatography/Mass 

Spectrometry.

524.3,9 524.4.29

2,4-D ..................... Gas Chromatography/Electron Capture 

Detection (GC/ 

ECD).

.............................. 6640 B ................. 6640 B ................. 6640 B–01, B–06 D 5317–20.

2,4,5-TP (Silvex) ... Gas Chromatography/Electron Capture 

Detection (GC/ 

ECD).

.............................. 6640 B ................. 6640 B ................. 6640 B–01, B–06 D 5317–20.

Alachlor ................. Solid Phase Extraction/Gas 

Chromatography/Mass 

Spectrometry 

(GC/MS).

525.3.24

Atrazine ................. Liquid Chromatography 

Electrospray 

Ionization Tandem Mass 

Spectrometry 

(LC/ESI–MS/ 

MS).

536.25

Solid Phase Extraction/Gas 

Chromatography/Mass 

Spectrometry 

(GC/MS).

525.3,24 523.26

Benzo(a)pyrene .... Solid Phase Extraction/Gas 

Chromatography/Mass 

Spectrometry 

(GC/MS).

525.3.24

Carbofuran ............ High-performance 

liquid chromatography 

(HPLC) with 

post-column 

derivatization 

and fluorescence detection.

.............................. 6610 B ................. 6610 B ................. 6610 B–04.

Liquid Chromatography/Mass 

Spectrometry.

.............................. .............................. .............................. .............................. .............................. ME 531.58

Chlordane ............. Solid Phase Extraction/Gas 

Chromatography/Mass 

Spectrometry 

(GC/MS).

525.3.24

Dalapon ................ Ion Chromatography 

Electrospray 

Ionization Tandem Mass 

Spectrometry 

(IC–ESI–MS/ 

MS).

557.14

Gas Chromatography/Electron Capture 

Detection (GC/ 

ECD).

.............................. 6640 B ................. 6640 B ................. 6640 B–01, B–06.


khammond on DSKJM1Z7X2PROD with RULES
5786 Federal Register / Vol. 89, No. 20 / Tuesday, January 30, 2024 / Rules and Regulations 

ALTERNATIVE TESTING METHODS FOR CONTAMINANTS LISTED AT 40 CFR 141.24(e)(1)—Continued 

Contaminant Methodology EPA method SM 21st edition 1

SM 22nd 

edition,28 SM 

23rd edition,49 SM 

24th edition 66

SM online 3 ASTM 4 Other 

Di(2- 

ethylhexyl)adipate.

Solid Phase Extraction/Gas 

Chromatography/Mass 

Spectrometry 

(GC/MS).

525.3.24

Di(2- 

ethylhexyl)phthalate.

Solid Phase Extraction/Gas 

Chromatography/Mass 

Spectrometry 

(GC/MS).

525.3.24

Dibromochloropropane (DBCP).Purge &Trap/Gas 

Chromatography/Mass 

Spectrometry.

524.3.9

Dinoseb ................. Gas Chromatography/Electron Capture 

Detection (GC/ 

ECD).

.............................. 6640 B ................. 6640 B ................. 6640 B–01, B–06.

Endrin ................... Solid Phase Extraction/Gas 

Chromatography/Mass 

Spectrometry 

(GC/MS).

525.3.24

Ethyl dibromide 

(EDB).

Purge &Trap/Gas 

Chromatography/Mass 

Spectrometry.

524.3.9

Glyphosate ........... High-Performance 

Liquid Chromatography 

(HPLC) with 

Post-Column 

Derivatization 

and Fluorescence Detection.

.............................. 6651 B ................. 6651 B ................. 6651 B–00, B–05.

Heptachlor ............ Solid Phase Extraction/Gas 

Chromatography/Mass 

Spectrometry 

(GC/MS).

525.3.24

Heptachlor Epoxide.Solid Phase Extraction/Gas 

Chromatography/Mass 

Spectrometry 

(GC/MS).

525.3.24

Hexachlorobenzene.Solid Phase Extraction/Gas 

Chromatography/Mass 

Spectrometry 

(GC/MS).

525.3.24

Hexachlorocyclopentadiene.Solid Phase Extraction/Gas 

Chromatography/Mass 

Spectrometry 

(GC/MS).

525.3.24

Lindane ................. Solid Phase Extraction/Gas 

Chromatography/Mass 

Spectrometry 

(GC/MS).

525.3.24

Methoxychlor ........ Solid Phase Extraction/Gas 

Chromatography/Mass 

Spectrometry 

(GC/MS).

525.3.24


khammond on DSKJM1Z7X2PROD with RULES
Federal Register / Vol. 89, No. 20 / Tuesday, January 30, 2024 / Rules and Regulations 5787 

ALTERNATIVE TESTING METHODS FOR CONTAMINANTS LISTED AT 40 CFR 141.24(e)(1)—Continued 

Contaminant Methodology EPA method SM 21st edition 1

SM 22nd 

edition,28 SM 

23rd edition,49 SM 

24th edition 66

SM online 3 ASTM 4 Other 

Oxamyl ................. High-performance 

liquid chromatography 

(HPLC) with 

post-column 

derivatization 

and fluorescence detection.

.............................. 6610 B ................. 6610 B ................. 6610 B–04.

Liquid Chromatography/Mass 

Spectrometry.

.............................. .............................. .............................. .............................. .............................. ME 531.58.

PCBs (as Aroclors) Solid Phase Extraction/Gas 

Chromatography/Mass 

Spectrometry 

(GC/MS).

525.3.24

Pentachlorophenol Gas Chromatography/Electron Capture 

Detection (GC/ 

ECD).

.............................. 6640 B ................. 6640 B ................. 6640 B–01, B–06 D 5317–20.

Solid Phase Extraction/Gas 

Chromatography/ 

Mass Spectrometry (GC/MS).

525.3.24

Picloram ................ Gas Chromatography/Electron Capture 

Detection (GC/ 

ECD).

.............................. 6640 B ................. 6640 B ................. 6640 B–01, B–06 D 5317–20.

Simazine ............... Liquid Chromatography 

Electrospray 

Ionization Tandem Mass 

Spectrometry 

(LC/ESI–MS/ 

MS).

536.25

Solid Phase Extraction/Gas 

Chromatography/ 

Mass Spectrometry (GC/MS).

525.3,24 523.26

Toxaphene ............ Solid Phase Extraction/Gas 

Chromatography/Mass 

Spectrometry 

(GC/MS).

525.3.24

Total 

Trihalomethanes.

Purge &Trap/Gas 

Chromatography/Mass 

Spectrometry.

524.3,9 524.4.29

ALTERNATIVE TESTING METHODS FOR CONTAMINANTS LISTED AT 40 CFR 141.25(a) 

Contaminant Methodology EPA method SM 21st edition 1

SM 22nd edition,28

SM 23rd edition,49

SM 24th edition 66

ASTM 4 SM online 3

Naturally Occurring: 

Gross alpha and 

beta.

Evaporation .............. 900.0, Rev. 1.0 50 .... 7110 B ..................... 7110 B.

Liquid Scintillation .... .................................. .................................. 7110 D ..................... D 7283–17 ............... 7110 D–17. 

Gross alpha ......... Coprecipitation ......... .................................. 7110 C ..................... 7110 C.

Radium 226 ......... Radon emanation .... 903.1, Rev. 1.0 53 .... 7500-Ra C ............... 7500-Ra C ............... D 3454–05, –18, D 

3454–21.

Radiochemical ......... 903.0, Rev. 1.0 54 .... 7500-Ra B ................ 7500-Ra B ................ D 2460–07.

Gamma Spectrometry................................... .................................. 7500-Ra E ................ .................................. 7500-Ra E–07. 

Radium 228 ......... Radiochemical ......... 904.0, Rev. 1.0 62 .... 7500-Ra D ............... 7500-Ra D.

Gamma Spectrometry................................... .................................. 7500-Ra E ................ .................................. 7500-Ra E–07. 

Uranium ............... Radiochemical ......... .................................. 7500–U B ................. 7500–U B.

ICP–MS .................... .................................. 3125 ......................... .................................. D 5673–05, 10, 16.


khammond on DSKJM1Z7X2PROD with RULES
5788 Federal Register / Vol. 89, No. 20 / Tuesday, January 30, 2024 / Rules and Regulations 

ALTERNATIVE TESTING METHODS FOR CONTAMINANTS LISTED AT 40 CFR 141.25(a)—Continued 

Contaminant Methodology EPA method SM 21st edition 1

SM 22nd edition,28

SM 23rd edition,49

SM 24th edition 66

ASTM 4 SM online 3

Alpha spectrometry .. .................................. 7500–U C ................. 7500–U C ................. D 3972–09.

Laser 

Phosphorimetry.

.................................. .................................. .................................. D 5174–07.

Alpha Liquid Scintillation Spectrometry................................... .................................. .................................. D 6239–09.

Man-Made: 

Radioactive Cesium.Radiochemical ......... .................................. 7500-Cs B ................ 7500-Cs B.

Gamma Ray Spectrometry................................... 7120 ......................... 7120 ......................... D 3649–06.

Radioactive Iodine Radiochemical ......... .................................. 7500–I B, 7500–I C, 

7500–I D.

7500–I B, 7500–I C, 

7500–I D.

D 3649–06.

Gamma Ray Spectrometry................................... 7120 ......................... 7120 ......................... D 4785–08, –20.

Radioactive Strontium 89, 90.Radiochemical ......... .................................. 7500-Sr B ................. 7500-Sr B.

Tritium .................. Liquid Scintillation .... .................................. 7500-3H B ................ 7500-3H B ................ D 4107–08, –20.

Gamma Emitters Gamma Ray Spectrometry................................... 7120, 7500-Cs B, 

7500–I B.

7120, 7500-Cs B, 

7500–I B.

D 3649–06, D 4785– 

08, –20.

ALTERNATIVE TESTING METHODS FOR CONTAMINANTS LISTED AT 40 CFR 141.74(a)(1) 

Organism Methodology SM 21st edition 1 SM 22nd 

edition 28 SM 23rd edition 49 SM 24th edition 66 SM online 3 Other 

Total Coliform ....... Total Coliform 

Fermentation 

Technique.

9221 A, B, C ....... 9221 A, B, C ....... 9221 A, B, C ....... 9221 A, B, C ....... 9221 A, B, C–06.

Total Coliform 

Membrane Filter 

Technique.

9222 A, B, C ....... .............................. 9222 A, B, C ....... 9222 A, B, C.

ONPG–MUG Test 9223 .................... 9223 B ................. 9223 B ................. 9223 B ................. 9223 B–04.

Fecal Coliforms ..... Fecal Coliform 

Procedure.

9221 E ................. 9221 E ................. 9221 E ................. 9221 E ................. 9221 E–06.

Fecal Coliform Filter Procedure.9222 D ................. 9222 D ................. 9222 D ................. 9222 D ................. 9222 D–06.

Heterotrophic bacteria.Pour Plate Method.9215 B ................. 9215 B ................. 9215 B ................. .............................. 9215 B–04.

Turbidity ................ Nephelometric 

Method.

2130 B ................. 2130 B ................. 2130 B ................. 2130 B ................. .............................. Hach Method 

8195, Rev. 

3.0.52

Laser 

Nephelometry 

(on-line).

.............................. .............................. .............................. .............................. .............................. Mitchell M5271,10

Mitchell M5331, 

Rev. 1.2,42

Lovibond PTV 

6000.46

LED 

Nephelometry 

(on-line).

.............................. .............................. .............................. .............................. .............................. Mitchell M5331,11

Mitchell M5331, 

Rev. 1.2,42

Lovibond PTV 

2000,45

Yokogawa 

820.68

LED 

Nephelometry 

(on-line).

.............................. .............................. .............................. .............................. .............................. AMI Turbiwell,15

Lovibond PTV 

1000.44

LED 

Nephelometry 

(portable).

.............................. .............................. .............................. .............................. .............................. Orion AQ4500,12

Lovibond TB 

3500,64

Lovibond TB 

5000.65

Laser 

Nephelometry 

(portable).

.............................. .............................. .............................. .............................. .............................. Lovibond TB 

6000.63

360° 

Nephelometry.

.............................. .............................. .............................. .............................. .............................. Hach Method 

10258, Rev. 

1.0,39 Hach 

Method 10258, 

Rev. 2.0.51


khammond on DSKJM1Z7X2PROD with RULES
Federal Register / Vol. 89, No. 20 / Tuesday, January 30, 2024 / Rules and Regulations 5789 

ALTERNATIVE TESTING METHODS FOR DISINFECTANT RESIDUALS LISTED AT 40 CFR 141.74(a)(2) 

Residual Methodology EPA methods SM 21st edition 1

SM 22nd edition,28

SM 23rd edition,49

SM 24th edition 66

ASTM 4 Other 

Free Chlorine .............. Amperometric Titration................................... 4500-Cl D ................. 4500-Cl D ................. D 1253–08, –14.

DPD Ferrous 

Titrimetric.

.................................. 4500-Cl F ................. 4500-Cl F.

DPD Colorimetric ..... .................................. 4500-Cl G ................ 4500-Cl G ................ .................................. Hach Method 

10260.31

Indophenol Colorimetric................................... .................................. .................................. .................................. Hach Method 

10241.34

Syringaldazine 

(FACTS).

.................................. 4500-Cl H ................. 4500-Cl H.

On-line Chlorine Analyzer.EPA 334.0.16

Amperometric Sensor................................... .................................. .................................. .................................. ChloroSense,17

ChloroSense, Rev. 

1.1.59

Total Chlorine ............. Amperometric Titration................................... 4500-Cl D ................. 4500-Cl D ................. D 1253–08, –14.

Amperometric Titration (Low level 

measurement).

.................................. 4500-Cl E ................. 4500-Cl E.

DPD Ferrous 

Titrimetric.

.................................. 4500-Cl F ................. 4500-Cl F.

DPD Colorimetric ..... .................................. 4500-Cl G ................ 4500-Cl G ................ .................................. Hach Method 

10260.31

Indophenol Colorimetric.127.55

Iodometric Electrode .................................. 4500-Cl I .................. 4500-Cl I.

On-line Chlorine Analyzer.EPA 334.0.16

Amperometric Sensor................................... .................................. .................................. .................................. ChloroSense,17

ChloroSense, Rev. 

1.1.59

Chlorine Dioxide ......... Amperometric Titration................................... 4500–ClO2 C ........... 4500–ClO2 C.

Amperometric Titration................................... 4500–ClO2 E ............ 4500–ClO2 E.

Amperometric Sensor................................... .................................. .................................. .................................. ChlordioX Plus,32

ChlordioX Plus, 

Rev. 1.1.60

Ozone ......................... Indigo Method .......... .................................. 4500–O3 B ............... 4500–O3 B.

ALTERNATIVE TESTING METHODS FOR CONTAMINANTS LISTED AT 40 CFR 141.131(b)(1) 

Contaminant Methodology EPA method ASTM 4 SM online 3 SM 21st edition 1

SM 22nd 

edition,28 SM 

23rd edition,49

SM 24th 

Edition 66

Other 

TTHM ........................... P&T/GC/MS ........ 524.3,9 524.4.29

HAA5 ........................... LLE (diazomethane)/GC/ 

ECD.

............................. ............................. 6251 B–07 .......... 6251 B ................ 6251 B.

Ion Chromatography 

Electrospray 

Ionization Tandem Mass 

Spectrometry 

(IC–ESI–MS/ 

MS).

557.14

Two-Dimensional 

Ion Chromatography (IC) 

with Suppressed Conductivity Detection.

............................. ............................. ............................. ............................. ............................. Thermo Fisher 

557.1.47

Bromate ....................... Two-Dimensional 

Ion Chromatography (IC).

302.018

Ion Chromatography 

Electrospray 

Ionization Tandem Mass 

Spectrometry 

(IC–ESI–MS/ 

MS).

557.14


khammond on DSKJM1Z7X2PROD with RULES
5790 Federal Register / Vol. 89, No. 20 / Tuesday, January 30, 2024 / Rules and Regulations 

ALTERNATIVE TESTING METHODS FOR CONTAMINANTS LISTED AT 40 CFR 141.131(b)(1)—Continued 

Contaminant Methodology EPA method ASTM 4 SM online 3 SM 21st edition 1

SM 22nd 

edition,28 SM 

23rd edition,49

SM 24th 

Edition 66

Other 

Chemically Suppressed Ion 

Chromatography.

............................. D 6581–08 A.

Electrolytically 

Suppressed Ion 

Chromatography.

............................. D 6581–08 B.

Chlorite ........................ Chemically Suppressed Ion 

Chromatography.

............................. D 6581–08 A.

Electrolytically 

Suppressed Ion 

Chromatography.

............................. D 6581–08 B.

Chlorite—daily monitoring as prescribed 

in 40 CFR 

141.132(b)(2)(i)(A).

Amperometric Titration.............................. ............................. ............................. 4500-ClO2 E ....... 4500-ClO2 E.

Amperometric 

Sensor.

............................. ............................. ............................. ............................. ............................. ChlordioX Plus,32

ChlordioX Plus, 

Rev. 1.1.60

ALTERNATIVE TESTING METHODS FOR DISINFECTANT RESIDUALS LISTED AT 40 CFR 141.131(c)(1) 

Free Chlorine ................... Amperometric Titration ... 4500-Cl D ....................... 4500-Cl D ....................... D 1253–08, –14.

DPD Ferrous Titrimetric .. 4500-Cl F ........................ 4500-Cl F.

DPD Colorimetric ............ 4500-Cl G ....................... 4500-Cl G ....................... ......................................... Hach Method 10260.31

Indophenol Colorimetric ......................................... ......................................... ......................................... Hach Method 10241.34

Syringaldazine (FACTS) 4500-Cl H ....................... 4500-Cl H.

Amperometric Sensor ..... ......................................... ......................................... ......................................... ChloroSense,17

ChloroSense, Rev. 

1.1.59

On-line Chlorine Analyzer ......................................... ......................................... ......................................... EPA 334.0.16

Combined Chlorine .......... Amperometric Titration ... 4500-Cl D ....................... 4500-Cl D ....................... D 1253–08, –14..

DPD Ferrous Titrimetric .. 4500-Cl F ........................ 4500-Cl F.

DPD Colorimetric ............ 4500-Cl G ....................... 4500-Cl G ....................... ......................................... Hach Method 10260.31

Total Chlorine .................. Amperometric Titration ... 4500-Cl D ....................... 4500-Cl D ....................... D 1253–08, –14.

≤Low level Amperometric 

Titration.

4500-Cl E ....................... 4500-Cl E.

DPD Ferrous Titrimetric .. 4500-Cl F ........................ 4500-Cl F.

DPD Colorimetric ............ 4500-Cl G ....................... 4500-Cl G ....................... ......................................... Hach Method 10260.31

Iodometric Electrode ...... 4500-Cl I ......................... 4500-Cl I.

Amperometric Sensor ..... ......................................... ......................................... ......................................... ChloroSense,17

ChloroSense, Rev. 

1.1.59

On-line Chlorine Analyzer ......................................... ......................................... ......................................... EPA 334.0.16

Chlorine Dioxide .............. Amperometric Method II 4500–ClO2 E .................. 4500–ClO2 E.

Amperometric Sensor ..... ......................................... ......................................... ......................................... ChlordioX Plus,32

ChlordioX Plus, Rev. 

1.1.60

* * * * * 

ALTERNATIVE TESTING METHODS FOR PARAMETERS LISTED AT 40 CFR 141.131(d) 

Total Organic Carbon (TOC).High Temperature 

Combustion.

5310 B ................. 5310 B ................. 5310 B ................. .............................. 415.3, Rev 1.2 19.

Persulfate-Ultraviolet or Heated 

Persulfate Oxidation.

5310 C ................. 5310 C ................. 5310 C ................. .............................. 415.3, Rev 1.2 19 Hach Method 

10267 38. 

Wet Oxidation ...... 5310 D ................. 5310 D ................. .............................. .............................. 415.3, Rev 1.2 19.

Ozone Oxidation .............................. .............................. .............................. .............................. .............................. Hach Method 

10261 37. 

Specific Ultraviolet 

Absorbance 

(SUVA).

Calculation using 

DOC and UV254

data.

.............................. .............................. .............................. .............................. 415.3, Rev 1.2 19.

Dissolved Organic 

Carbon (DOC).

High Temperature 

Combustion.

5310 B ................. 5310 B ................. 5310 B ................. .............................. 415.3, Rev 1.2 19.


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Federal Register / Vol. 89, No. 20 / Tuesday, January 30, 2024 / Rules and Regulations 5791 

ALTERNATIVE TESTING METHODS FOR PARAMETERS LISTED AT 40 CFR 141.131(d)—Continued 

Persulfate-Ultraviolet or Heated 

Persulfate Oxidation.

5310 C ................. 5310 C ................. 5310 C ................. .............................. 415.3, Rev 1.2 19.

Wet Oxidation ...... 5310 D ................. 5310 D ................. .............................. .............................. 415.3, Rev 1.2 19.

Ultraviolet absorption at 254 nm 

(UV254).

Spectrophotometry.5910 B ................. 5910 B ................. 5910 B ................. 5910 B–11 ........... 415.3, Rev 1.2 19

* * * * * 

ALTERNATIVE TESTING METHODS FOR CONTAMINANTS LISTED AT 40 CFR 141.402(c)(2) 

E. coli .................... Colilert ................. .............................. 9223 B ................. 9223 B ................. 9223 B ................. 9223 B–97, B–04.

Colisure ............... .............................. 9223 B ................. 9223 B ................. 9223 B ................. 9223 B–97, B–04.

Colilert-18 ............ 9223 B ................. 9223 B ................. 9223 B ................. 9223 B ................. 9223 B–97, B–04.

Readycult® .......... .............................. .............................. .............................. .............................. .............................. Readycult®.20

Colitag ................. .............................. .............................. .............................. .............................. .............................. Modified 

ColitagTM 13, 

Modified 

Colitag TM, 

Version 2.0.61

Chromocult® ........ .............................. .............................. .............................. .............................. .............................. Chromocult®.21

EC–MUG ............. .............................. .............................. 9221 F ................. 9221 F ................. 9221 F–06.

NA–MUG ............. .............................. .............................. .............................. 9222 I.

mColiBlue24 Test .............................. .............................. .............................. 9222 J.

Tecta EC/TC 33 43.

RAPID’E.coli 2 56.

Enterococci ........... Multiple-Tube 

Technique.

.............................. .............................. .............................. 9230 B ................. 9230 B–04.

Membrane Filter 

Techniques.

.............................. .............................. .............................. 9230 C.

Fluorogenic Substrate 

Enterococcus 

Test (using 

Enterolert).

.............................. .............................. .............................. 9230 D.

Coliphage .............. Two-Step Enrichment PresenceAbsence Procedure............................... .............................. .............................. .............................. .............................. Fast Phage.30

* * * * * 

ALTERNATIVE TESTING METHODS FOR CONTAMINANTS LISTED AT 40 CFR 141.852(a)(5) 

Total Coliforms ........... Lactose Fermentation Methods.Standard Total Coliform Fermentation 

Technique.

.................................. 9221 B.1, B.2 ........... 9221 B.1, B.2, B.3, 

B.4.

9221 B.1, B.2–06. 

Presence-Absence 

(P–A) Coliform 

Test.

.................................. .................................. 9221 D.1, D.2, D.3.

Membrane Filtration 

Methods.

Standard Total Coliform Membrane 

Filter Procedure 

using Endo Media.

.................................. .................................. 9222 B, C.

Simultaneous Detection of Total Coliforms and E. coli 

by Dual 

Chromogen Membrane Filter Procedure (using 

mColiBlue24 medium).

.................................. .................................. 9222 J.

Simultaneous Detection of Total Coliform Bacteria and 

Escherichia coli 

Using RAPID’E.coli 

(REC2) in Drinking 

Water 56.

Enzyme Substrate 

Methods.

Colilert® .................... .................................. 9223 B ..................... 9223 B ..................... 9223 B–04. 

Colisure® .................. .................................. 9223 B ..................... 9223 B ..................... 9223 B–04. 

Colilert-18 ................. 9223 B ..................... 9223 B ..................... 9223 B ..................... 9223 B–04. 

Tecta EC/TC 33 43.


khammond on DSKJM1Z7X2PROD with RULES
5792 Federal Register / Vol. 89, No. 20 / Tuesday, January 30, 2024 / Rules and Regulations 

ALTERNATIVE TESTING METHODS FOR CONTAMINANTS LISTED AT 40 CFR 141.852(a)(5)—Continued 

Modified ColitagTM, 

Version 2.0 61.

Escherichia coli ........... Escherichia coli Procedure (following 

Lactose Fermentation Methods).

EC–MUG medium .... .................................. 9221 F.1 ................... 9221 F.1 ................... 9221 F.1–06. 

Escherichia coli Partitioning Methods 

(following Membrane Filtration 

Methods).

EC broth with MUG 

(EC–MUG).

.................................. .................................. 9222 H.

NA–MUG medium .... .................................. .................................. 9222 I.

Simultaneous Detection of Total Coliforms and E. coli 

by Dual 

Chromogen Membrane Filter Procedure.

mColiBlue24 medium .................................. .................................. 9222 J.

Membrane Filtration 

Method.

Simultaneous Detection of Total Coliform Bacteria and 

Escherichia coli 

Using RAPID’E.coli 

(REC2) in Drinking 

Water 56.

Enzyme Substrate 

Methods.

Colilert® .................... .................................. 9223 B ..................... 9223 B ..................... 9223 B–04. 

Colisure® .................. .................................. 9223 B ..................... 9223 B ..................... 9223 B–04. 

Colilert-18 ................. 9223 B ..................... 9223 B ..................... 9223 B ..................... 9223 B–04. 

Tecta EC/TC 33 43.

Modified ColitagTM, 

Version 2.0 61.

ALTERNATIVE TESTING METHODS FOR CONTAMINANTS LISTED AT 40 CFR 143.4(b) 

Contaminant Methodology EPA method ASTM 4 SM 21st edition 1

SM 22nd edition,28

SM 23rd edition,49

SM 24th edition 66

SM online 3

Aluminum .................... Axially viewed inductively coupled plasma-atomic emission spectrometry 

(AVICP–AES).

200.5, Revision 4.2 2.

Atomic Absorption; 

Direct.

.................................. .................................. 3111 D ..................... 3111 D.

Atomic Absorption; 

Furnace.

.................................. .................................. 3113 B ..................... 3113 B ..................... 3113 B–04, B–10. 

Inductively Coupled 

Plasma.

.................................. .................................. 3120 B ..................... 3120 B.

Chloride ...................... Silver Nitrate Titration................................... D 512–04 B, 12 B .... 4500-Cl minus;B .... 4500-Cl minus;B.

Ion Chromatography .................................. D 4327–11, –17 ....... 4110 B ..................... 4110 B.

Potentiometric Titration................................... .................................. 4500-Cl minus;D .... 4500-Cl minus;D.

Color ........................... Visual Comparison ... .................................. .................................. 2120 B ..................... 2120 B.

Foaming Agents ......... Methylene Blue Active Substances 

(MBAS).

.................................. .................................. 5540 C ..................... 5540 C.

Iron .............................. Axially viewed inductively coupled plasma-atomic emission spectrometry 

(AVICP–AES).

200.5, Revision 4.2 2.

Atomic Absorption; 

Direct.

.................................. .................................. 3111 B ..................... 3111 B.

Atomic Absorption; 

Furnace.

.................................. .................................. 3113 B ..................... 3113 B ..................... 3113 B–04, B–10 

Inductively Coupled 

Plasma.

.................................. .................................. 3120 B ..................... 3120 B.

Manganese ................. Axially viewed inductively coupled plasma-atomic emission spectrometry 

(AVICP–AES).

200.5, Revision 4.2 2.

Atomic Absorption; 

Direct.

.................................. .................................. 3111 B ..................... 3111 B.

Atomic Absorption; 

Furnace.

.................................. .................................. 3113 B ..................... 3113 B ..................... 3113 B–04, B–10. 

Inductively Coupled 

Plasma.

.................................. .................................. 3120 B ..................... 3120 B.


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Federal Register / Vol. 89, No. 20 / Tuesday, January 30, 2024 / Rules and Regulations 5793 

ALTERNATIVE TESTING METHODS FOR CONTAMINANTS LISTED AT 40 CFR 143.4(b)—Continued 

Contaminant Methodology EPA method ASTM 4 SM 21st edition 1

SM 22nd edition,28

SM 23rd edition,49

SM 24th edition 66

SM online 3

Odor ............................ Threshold Odor Test .................................. .................................. 2150 B ..................... 2150 B.

Silver ........................... Axially viewed inductively coupled plasma-atomic emission spectrometry 

(AVICP–AES).

200.5, Revision 4.2 2.

Atomic Absorption; 

Direct.

.................................. .................................. 3111 B ..................... 3111 B.

Atomic Absorption; 

Furnace.

.................................. .................................. 3113 B ..................... 3113 B ..................... 3113 B–04, B–10. 

Inductively Coupled 

Plasma.

.................................. .................................. 3120 B ..................... 3120 B.

Sulfate ......................... Ion Chromatography .................................. D 4327–11, –17 ....... 4110 B ..................... 4110 B.

Gravimetric with ignition of residue................................... .................................. 4500–SO4

2 minus;C.

4500–SO4

2 minus;C.

4500–SO4

2 minus;C–97. 

Gravimetric with drying of residue................................... .................................. 4500–SO4

2 minus;D.

4500–SO4

2 minus;D.

4500–SO4

2 minus;D–97. 

Turbidimetric method .................................. D 516–07, 11, 16 ..... 4500–SO4

2 minus;E.

4500–SO4

2 minus;E.

4500–SO4

2 minus;E–97. 

Automated 

methylthymol blue 

method.

.................................. .................................. 4500–SO4

2 minus;F.

4500–SO4

2 minus;F.

4500–SO4

2 minus;F–97. 

Total Dissolved Solids Total Dissolved Solids Dried at 180 

deg C.

.................................. .................................. 2540 C ..................... 2540 C.

Zinc ............................. Axially viewed inductively coupled plasma-atomic emission spectrometry 

(AVICP–AES).

200.5, Revision 4.2 2.

Atomic Absorption; 

Direct Aspiration.

.................................. .................................. 3111 B ..................... 3111 B.

Inductively Coupled 

Plasma.

.................................. .................................. 3120 B ..................... 3120 B.

******* 1Standard Methods for the Examination of Water and Wastewater, 21st edition (2005). Available from American Public Health Association, 800 I Street NW, Washington, DC 20001–3710. 2EPA Method 200.5, Revision 4.2. ‘‘Determination of Trace Elements in Drinking Water by Axially Viewed Inductively Coupled Plasma-Atomic Emission Spectrometry.’’ 2003. EPA/600/R–06/115. (Available at http://www.epa.gov/water-research/epa-drinking-water-research-methods.) 3Standard Methods Online are available at http://www.standardmethods.org. The year in which each method was approved by the Standard Methods Committee is 

designated by the last two digits in the method number. The methods listed are the only online versions that may be used. 4Available from ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428–2959 or http://astm.org. The methods listed are the only alternative 

versions that may be used. 

******* 6Standard Methods for the Examination of Water and Wastewater, 20th edition (1998). Available from American Public Health Association, 800 I Street NW, Washington, DC 20001–3710. 7 Method ME355.01, Revision 1.0. ‘‘Determination of Cyanide in Drinking Water by GC/MS Headspace,’’ May 26, 2009. Available at https://www.nemi.gov or from 

James Eaton, H & E Testing Laboratory, 221 State Street, Augusta, ME 04333. (207) 287–2727. 8Systea Easy (1-Reagent). ‘‘Systea Easy (1-Reagent) Nitrate Method,’’ February 4, 2009. Available at https://www.nemi.gov or from Systea Scientific, LLC., 900 

Jorie Blvd., Suite 35, Oak Brook, IL 60523. 9EPA Method 524.3, Version 1.0. ‘‘Measurement of Purgeable Organic Compounds in Water by Capillary Column Gas Chromatography/Mass Spectrometry,’’ June 

2009. EPA 815–B–09–009. Available at https://www.nemi.gov. 10 Mitchell Method M5271, Revision 1.1. ‘‘Determination of Turbidity by Laser Nephelometry,’’ March 5, 2009. Available at https://www.nemi.gov or from Leck Mitchell, Ph.D., PE, 656 Independence Valley Dr., Grand Junction, CO 81507. 11 Mitchell Method M5331, Revision 1.1. ‘‘Determination of Turbidity by LED Nephelometry,’’ March 5, 2009. Available at https://www.nemi.gov or from Leck Mitchell, Ph.D., PE, 656 Independence Valley Dr., Grand Junction, CO 81507. 12Orion Method AQ4500, Revision 1.0. ‘‘Determination of Turbidity by LED Nephelometry,’’ May 8, 2009. Available at https://www.nemi.gov or from Thermo Scientific, 166 Cummings Center, Beverly, MA 01915, http://www.thermo.com. 13 Modified ColitagTM Method. ‘‘Modified ColitagTM Test Method for the Simultaneous Detection of E. coli and other Total Coliforms in Water (ATP D05–0035),’’ August 28, 2009. Available at https://www.nemi.gov or from CPI International, 5580 Skylane Boulevard, Santa Rosa, CA 95403. 14EPA Method 557. ‘‘Determination of Haloacetic Acids, Bromate, and Dalapon in Drinking Water by Ion Chromatography Electrospray Ionization Tandem Mass 

Spectrometry (IC–ESI–MS/MS),’’ September 2009. EPA 815–B–09–012. Available at https://www.nemi.gov. 15AMI Turbiwell, ‘‘Continuous Measurement of Turbidity Using a SWAN AMI Turbiwell Turbidimeter,’’ August 2009. Available at https://www.nemi.gov or from 

Markus Bernasconi, SWAN Analytische Instrumente AG, Studbachstrasse 13, CH–8340 Hinwil, Switzerland. 16EPA Method 334.0. ‘‘Determination of Residual Chlorine in Drinking Water Using an On-line Chlorine Analyzer,’’ September 2009. EPA 815–B–09–013. Available 

at https://www.nemi.gov. 17 ChloroSense. ‘‘Measurement of Free and Total Chlorine in Drinking Water by Palintest ChloroSense,’’ August 2009. Available at https://www.nemi.gov or from 

Palintest Ltd, 1455 Jamike Avenue (Suite 100), Erlanger, KY 41018. 18EPA Method 302.0. ‘‘Determination of Bromate in Drinking Water using Two-Dimensional Ion Chromatography with Suppressed Conductivity Detection,’’ September 2009. EPA 815–B–09–014. Available at https://www.nemi.gov. 19EPA 415.3, Revision 1.2. ‘‘Determination of Total Organic Carbon and Specific UV Absorbance at 254 nm in Source Water and Drinking Water,’’ September 

2009. EPA/600/R–09/122. Available at http://www.epa.gov/water-research/epa-drinking-water-research-methods. 20 Readycult® Method, ‘‘Readycult® Coliforms 100 Presence/Absence Test for Detection and Identification of Coliform Bacteria and Escherichia coli in Finished 

Waters,’’ January, 2007. Version 1.1. Available from EMD Millipore (division of Merck KGaA, Darmstadt, Germany), 290 Concord Road, Billerica, MA 01821. 21 Chromocult® Method, ‘‘Chromocult® Coliform Agar Presence/Absence Membrane Filter Test Method for Detection and Identification of Coliform Bacteria and 

Escherichia coli in Finished Waters,’’ November, 2000. Version 1.0. EMD Millipore (division of Merck KGaA, Darmstadt, Germany), 290 Concord Road, Billerica, MA 

01821. 22 Hach Company. ‘‘Hach Company SPADNS 2 (Arsenite-Free) Fluoride Method 10225–Spectrophotometric Measurement of Fluoride in Water and Wastewater,’’ 

January 2011. 5600 Lindbergh Drive, P.O. Box 389, Loveland, Colorado 80539. 23 Hach Company. ‘‘Hach Company TNTplusTM 835/836 Nitrate Method 10206–Spectrophotometric Measurement of Nitrate in Water and Wastewater,’’ January 

2011. 5600 Lindbergh Drive, P.O. Box 389, Loveland, Colorado 80539. 24EPA Method 525.3. ‘‘Determination of Semivolatile Organic Chemicals in Drinking Water by Solid Phase Extraction and Capillary Column Gas Chromatography/ 

Mass Spectrometry (GC/MS),’’ February 2012. EPA/600/R–12/010. Available at http://www.epa.gov/water-research/epa-drinking-water-research-methods. 


khammond on DSKJM1Z7X2PROD with RULES
5794 Federal Register / Vol. 89, No. 20 / Tuesday, January 30, 2024 / Rules and Regulations 

25EPA Method 536. ‘‘Determination of Triazine Pesticides and their Degradates in Drinking Water by Liquid Chromatography Electrospray Ionization Tandem Mass 

Spectrometry (LC/ESI–MS/MS),’’ October 2007. EPA 815–B–07–002. Available at the National Service Center for Environmental Publications at https://www.epa.gov/ 

nscep. 26EPA Method 523. ‘‘Determination of Triazine Pesticides and their Degradates in Drinking Water by Gas Chromatography/Mass Spectrometry (GC/MS),’’ February 

2011. EPA 815–R–11–002. Available at the National Service Center for Environmental Publications at https://www.epa.gov/nscep. 

******* 28Standard Methods for the Examination of Water and Wastewater, 22nd edition (2012). Available from American Public Health Association, 800 I Street NW, 

Washington, DC 20001–3710. 29EPA Method 524.4, Version 1.0. ‘‘Measurement of Purgeable Organic Compounds in Water by Gas Chromatography/Mass Spectrometry using Nitrogen Purge 

Gas.’’ May 2013. EPA 815–R–13–002. Available at the National Service Center for Environmental Publications at https://www.epa.gov/nscep. 30 Charm Sciences Inc. ‘‘Fast Phage Test Procedure. Presence/Absence for Coliphage in Ground Water with Same Day Positive Prediction’’. Version 009. November 2012. 659 Andover Street, Lawrence, MA 01843. Available at www.charmsciences.com. 31 Hach Company. ‘‘Hach Method 10260–Determination of Chlorinated Oxidants (Free and Total) in Water Using Disposable Planar Reagent-filled Cuvettes and 

Mesofluidic Channel Colorimetry,’’ April 2013. 5600 Lindbergh Drive, P.O. Box 389, Loveland, CO 80539. 32 ChlordioX Plus. ‘‘Chlorine Dioxide and Chlorite in Drinking Water by Amperometry using Disposable Sensors,’’ November 2013. 

Available from Palintest Ltd, 1455 Jamike Avenue (Suite 100), Erlanger, KY 41018. 

33Tecta EC/TC. ‘‘TechtaTM EC/TC Medium and TechtaTM Instrument: A Presence/Absence Method for the Simultaneous Detection of Total Coliforms and Escherichia coli (E. coli) in Drinking Water,’’ version 1.0, May 2014. Available from Pathogen Detection Systems, Inc., 382 King Street East, Kingston, Ontario, Canada, 

K7K 2Y2. 34 Hach Company. ‘‘Hach Method 10241–Spectrophotometric Measurement of Free Chlorine (Cl2) in Drinking Water,’’ November 2015. Revision 1.2. 5600 Lindbergh Drive, P.O. Box 389, Loveland, CO 80539. 35 Hach Company. ‘‘Hach Method 8026–Spectrophotometric Measurement of Copper in Finished Drinking Water,’’ December 2015. Revision 1.2. 5600 Lindbergh 

Drive, P.O. Box 389, Loveland, CO 80539. 36 Hach Company. ‘‘Hach Method 10272–Spectrophotometric Measurement of Copper in Finished Drinking Water,’’ December 2015. Revision 1.2. 5600 Lindbergh 

Drive, P.O. Box 389, Loveland, CO 80539. 37 Hach Company. ‘‘Hach Method 10261–Total Organic Carbon in Finished Drinking Water by Catalyzed Ozone Hydroxyl Radical Oxidation Infrared Analysis,’’ December 2015. Revision 1.2. 5600 Lindbergh Drive, P.O. Box 389, Loveland, CO 80539. 38 Hach Company. ‘‘Hach Method 10267–Spectrophotometric Measurement of Total Organic Carbon (TOC) in Finished Drinking Water,’’ December 2015. Revision 

1.2. 5600 Lindbergh Drive, P.O. Box 389, Loveland, CO 80539. 39 Hach Company. ‘‘Hach Method 10258–Determination of Turbidity by 360° Nephelometry,’’ January 2016. Revision 1.0. 5600 Lindbergh Drive, P.O. Box 389, 

Loveland, CO 80539. 40 Nitrate Elimination Company Inc. (NECi). ‘‘Method for Nitrate Reductase Nitrate-Nitrogen Analysis of Drinking Water,’’ February 2016. Superior Enzymes Inc., 

334 Hecla Street, Lake Linden, Michigan 49945. 41Thermo Fisher. ‘‘Thermo Fisher Scientific Drinking Water Orthophosphate Method for Thermo Scientific Gallery Discrete Analyzer,’’ February 2016. Revision 5. 

Thermo Fisher Scientific, Ratastie 2, 01620 Vantaa, Finland. 42 Mitchell Method M5331, Revision 1.2. ‘‘Determination of Turbidity by LED or Laser Nephelometry,’’ February 2016. Available from Leck Mitchell, Ph.D., PE, 656 

Independence Valley Dr., Grand Junction, CO 81507. 43Tecta EC/TC. ‘‘TectaTM EC/TC Medium and the TectaTM Instrument: A Presence/Absence Method for the Simultaneous Detection of Total Coliforms and Escherichia coli (E. coli) in Drinking Water,’’ version 2.0, March 2017. Available from Pathogen Detection Systems, Inc., 382 King Street East, Kingston, Ontario, Canada, 

K7K 2Y2. 44 Lovibond PTV 1000. ‘‘Continuous Measurement of Drinking Water Turbidity using a Lovibond PTV 1000 White Light LED Turbidimeter,’’ December 2016. Revision 1.0. Available from Tintometer, Inc., 6456 Parkland Drive, Sarasota, FL 34243. 45 Lovibond PTV 2000. ‘‘Continuous Measurement of Drinking Water Turbidity Using a Lovibond PTV 2000 660-nm LED Turbidimeter,’’ December 2016. Revision 

1.0. Available from Tintometer, Inc., 6456 Parkland Drive, Sarasota, FL 34243. 46 Lovibond PTV 6000. ‘‘Continuous Measurement of Drinking Water Turbidity Using a Lovibond PTV 6000 Laser Turbidimeter,’’ December 2016. Revision 1.0. 

Available from Tintometer, Inc., 6456 Parkland Drive, Sarasota, FL 34243. 47Thermo Fisher. ‘‘Thermo Fisher method 557.1: Determination of Haloacetic Acids in Drinking Water using Two-Dimensional Ion Chromatography with Suppressed Conductivity Detection,’’ January 2017. Version 1.0. Available from Thermo Fisher Scientific, 490 Lakeside Dr., Sunnyvale, CA 94085 (Richard.jack@

thermofisher.com). 48EPA Method 150.3. ‘‘Determination of pH in Drinking Water,’’ February 2017. EPA 815–B–17–001. Available at the National Service Center for Environmental 

Publications at https://www.epa.gov/nscep. 49Standard Methods for the Examination of Water and Wastewater, 23rd edition (2017). Available from American Public Health Association, 800 I Street NW, 

Washington, DC 20001–3710. 50EPA Method 900.0, Rev. 1.0. ‘‘Determination of Gross Alpha and Gross Beta in Drinking Water,’’ February 2018. EPA 815–B–18–002. Available at the National 

Service Center for Environmental Publications at https://www.epa.gov/nscep. 51 Hach Company. ‘‘Hach Method 10258—Determination of Turbidity by 360° Nephelometry.’’ March 2018. Revision 2.0. 5600 Lindbergh Drive, P.O. Box 389, 

Loveland, CO 80539. 52 Hach Company. ‘‘Hach Method 8195–Determination of Turbidity by Nephelometry.’’ March 2018. Revision 3.0. 5600 Lindbergh Drive, P.O. Box 389, Loveland, 

CO 80539. 53EPA Method 903.1, Rev. 1.0. ‘‘Radium-226 in Drinking Water Radon Emanation Technique.’’ January 2021. EPA 815–B–21–003. Available at the National Service Center for Environmental Publications at https://www.epa.gov/nscep. 54EPA Method 903.0, Rev. 1.0. ‘‘Alpha-Emitting Radium Isotopes in Drinking Water.’’ January 2021. EPA 815–B–21–002. Available at the National Service Center 

for Environmental Publications at https://www.epa.gov/nscep. 55EPA Method 127. ‘‘Determination of Monochloramine Concentration in Drinking Water.’’ January 2021. EPA 815–B–21–004. Available at the National Service 

Center for Environmental Publications at https://www.epa.gov/nscep. 56Bio-Rad. ‘‘Simultaneous Detection of Total Coliform Bacteria and Escherichia coli using RAPID’E. coli 2 (REC2) in Drinking Water.’’ May 2020. Bio-Rad Laboratories, 2000 Nobel Drive, Hercules, California 94547. 57 Method 1001, Rev. 1.1. ‘‘Lead in Drinking Water by Differential Pulse Anodic Stripping Voltammetry.’’ May 2020. Palintest Ltd, 400 Corporate Circle, Suite J, 

Golden, CO 80401. 58 ME 531, Version 1.0. ‘‘Measurement of N-Methylcarbamoyloximes and N-Methylcarbamates in Drinking Water by LC–MS/MS. September 2019. Maine Health 

Environmental Testing Laboratory, 221 State Street, Augusta, ME 04330. 59 ChloroSense, Rev. 1.1. ‘‘Free and Total Chlorine in Drinking Water by Amperometry using Disposable Sensors.’’ February 2020. Palintest Ltd, 400 Corporate Circle, Suite J, Golden, CO 80401. 60 ChlordioX Plus, Rev. 1.1. ‘‘Chlorine Dioxide and Chlorite in Drinking Water by Amperometry using Disposable Sensors.’’ February 2020. Palintest Ltd, 400 Corporate Circle, Suite J, Golden, CO 80401. 61 Modified ColitagTM, Version 2.0. ‘‘Modified ColitagTM Test Method for the Simultaneous Determination of Total Coliforms and E. coli in Water.’’ June 2020. 

Neogen Corporation, 620 Lesher Place, Lansing, MI 48912. 62EPA Method 904.0, Rev. 1.0. ‘‘Radium-228 in Drinking Water.’’ March 2022. EPA 815–B–22–003. Available at the National Service Center for Environmental 

Publications at https://www.epa.gov/nscep. 63 Lovibond TB 6000. ‘‘Measurement of Drinking Water Turbidity of a Captured Sample using a Lovibond Portable Laser Turbidimeter.’’ May 2021. Revision 1.0. 

Available from Tintometer, Inc., 6456 Parkland Drive, Sarasota, FL 34243. 64 Lovibond TB 3500. ‘‘Measurement of Drinking Water Turbidity of a Captured Sample using a Lovibond White Light LED Portable Turbidimeter.’’ May 2021. Revision 1.0. Available from Tintometer, Inc., 6456 Parkland Drive, Sarasota, FL 34243. 65 Lovibond TB 5000. ‘‘Measurement of Drinking Water Turbidity of a Captured Sample using a Lovibond 660-nm LED Portable Turbidimeter.’’ May 2021. Revision 

1.0. Available from Tintometer, Inc., 6456 Parkland Drive, Sarasota, FL 34243. 66Standard Methods for the Examination of Water and Wastewater, 24th edition (2023). Available from American Public Health Association, 800 I Street NW, 

Washington, DC 20001–3710. 67 Hach Company. ‘‘Hach Method 10312—Spectrophotometric Measurement of Fluoride in Finished Drinking Water Aluminum-Chromeazurol S complex (AL–CAS) 

Using Planar Reagent-filled Cuvettes’’. August 2022. Revision 1.0. 5600 Lindbergh Drive, Loveland, Colorado 80539. 68Yokogawa Electric Corporation. ‘‘Yokogawa Method 820—Measurement of Turbidity in Drinking Water by Right Angle Scattered Light Turbidity Analyzer’’. November 2022. Revision 1.0. 2–9–32 Nakamachi, Musashino-shi, Tokyo, Japan 180–8750. 

[FR Doc. 2024–01530 Filed 1–29–24; 8:45 am] 

BILLING CODE 6560–50–P 


khammond on DSKJM1Z7X2PROD with RULES