United States Prevention, Pesticides EPA 738-R-08-012 

Environmental Protection and Toxic Substances 

Agency (7508P) 

Reregistration 

Eligibility Decision 

(RED) Document for 

Tetramethrin 

Revised April 2010

TABLE OF CONTENTS

I. Introduction............................................................................................................................. 1 

II. Chemical Overview................................................................................................................. 2 

A. Regulatory History............................................................................................................ 2 

B. Chemical Identification..................................................................................................... 2 

C. Use Profile.......................................................................................................................... 3 

D. Estimated Usage of Pesticide............................................................................................ 4 

III. Summary of Tetramethrin Risk Assessments........................................................................ 6 

A. Human Health Risk Assessment......................................................................................... 6 

1. Toxicity of Tetramethrin........................................................................................... 7 

2. Carcinogenicity of Tetramethrin ............................................................................ 10 

3. Metabolites and Degradates.................................................................................. 10 

4. Dietary Exposure and Risk (Food and Water)....................................................... 11 

5. Residential Exposure and Risk............................................................................. 11 

6. Aggregate Exposure and Risk............................................................................... 16 

7. Occupational Exposure and Risk ......................................................................... 16 

8. Cumulative Exposure and Risk ............................................................................ 18 

9. Tetramethrin Human Incident Reports............................................................... 19 

B. Environmental Risk Assessment.................................................................................... 20 

1. Environmental Fate and Transport........................................................................ 20 

2. Ecological Exposure and Risk................................................................................. 21 

3. Adverse Ecological Incidents................................................................................ 24 

4. Endangered Species Considerations .................................................................... 25 

IV. Risk Management, Reregistration, and Tolerance Reassessment Decision................... 27 

A. Determination of Reregistration Eligibility.................................................................. 27 

B. Public Participation......................................................................................................... 27 

C. Regulatory Position......................................................................................................... 27 

1. Regulatory Rationale ............................................................................................. 27 

2. Endocrine Disruptor Screening Program............................................................ 29 

3. Endangered Species............................................................................................... 29 

D. Labeling Requirements................................................................................................... 30 

V. What Registrants Need to Do............................................................................................... 31 

A. Manufacturing Use Products......................................................................................... 31 

1. Additional Generic Data Requirements............................................................... 31 

2. Labeling for Manufacturing-Use Products ......................................................... 31 

B. End-Use Products............................................................................................................ 32 

1. Additional Product-Specific Data Requirements................................................ 32 

2. Labeling for End-Use Products............................................................................ 32 

C. Labeling Changes Summary Table ............................................................................... 34 

Appendix A. Non-Food and Non-Feed Use Patterns Subject to the Reregistration of 

Tetramethrin .................................................................................................... 52 

Appendix B. Data Supporting Guideline Requirements for Tetramethrin...................... 53 

Appendix C. Technical Support Documents........................................................................ 56 

Appendix D. Bibliography ..................................................................................................... 57 

Appendix E. Tetramethrin Acute Mammalian Toxicity Batching.................................... 64 
iv

Glossary of Terms and Abbreviations 

a.i. Active Ingredient 

CFR Code of Federal Regulations 

CSF Confidential Statement of Formula 

DCI Data Call-In 

DFR Dislodgeable Foliar Residue 

DNT Developmental Neurotoxicity 

EC Emulsifiable Concentrate Formulation 

EEC Estimated Environmental Concentration 

EPA Environmental Protection Agency 

EUP End-Use Product 

FIFRA Federal Insecticide, Fungicide, and Rodenticide Act 

FFDCA Federal Food, Drug, and Cosmetic Act 

G Granular Formulation 

GLN Guideline Number 

HP High pressure 

LC50 Median Lethal Concentration. A statistically derived concentration of a substance that can be expected 

to cause death in 50% of test animals. It is usually expressed as the weight of substance per weight or 

volume of water, air or feed, e.g., mg/l, mg/kg or ppm. 

LD50 Median Lethal Dose. A statistically derived single dose that can be expected to cause death in 50% of 

the test animals when administered by the route indicated (oral, dermal, inhalation). It is expressed as 

a weight of substance per unit weight of animal, e.g., mg/kg. 

LOC Level of Concern 

LOAEL Lowest Observed Adverse Effect Level 

LP Low pressure 

mg/kg/day Milligram Per Kilogram Per Day 

mg/L Milligrams Per Liter 

MOE Margin of Exposure 

MRID Master Record Identification (number). EPA's system of recording and tracking studies submitted. 

MUP Manufacturing-Use Product 

N/A Not Applicable 

NDETF Non-Dietary Exposure Task Force 

NLAA Not Likely to Adversely Affect 

NR Not Required 

NOAEL No Observed Adverse Effect Level 

OPP EPA Office of Pesticide Programs 

OPPTS EPA Office of Prevention, Pesticides and Toxic Substances 

PCA Percent Crop Area 

PHED Pesticide Handler's Exposure Data 

PHI Preharvest Interval 

ppb Parts Per Billion 

PPE Personal Protective Equipment 

ppm Parts per Million 

RED Reregistration Eligibility Decision 

REI Restricted Entry Interval 

RfD Reference Dose 

RQ Risk Quotient 

SF Safety Factor 

SLC Single Layer Clothing 

SLN Special Local Need (Registrations Under Section 24(c) of FIFRA) 

TGAI Technical Grade Active Ingredient 

USDA United States Department of Agriculture 

UF Uncertainty Factor 

UFdb Database Uncertainty Factor 
v

TETRAMETHRIN TEAM MEMBERS 

Office of Pesticide Programs: 

Health Effects Risk Assessment

Becky Daiss 

Marquea King 

Abdallah Khasinawah 

Matt Crowley 

Susan Hummel 

Ecological Fate and Effects Risk Assessment

William Eckel 

Wanda Hall 

Richard Lee 

Ibrahim Abdel-Saheb 

Dana Spatz 

Biological and Economics Analysis Assessment

LaVerne Dobbins 

Nikhil Mallampalli 

Jihad Alsadek 

Registration Division

Richard Gebken 

Carmen Rodia 

Risk Management

Jacqueline Guerry 

Monica Wait 

Neil Anderson 
vi

Summary of Revisions to the Tetramethrin Reregistration Eligibility Decision 

 The Reregistration Eligibility Decision (RED) document for Tetramethrin was signed on 

June 23, 2008, and is available on the Federal Docket Management System (FDMS), available at 

http://www.regulations.gov (document # EPA-HQ-OPP-2008-0014-0019). Although a public 

comment period did not follow the RED, the Agency did receive comments from the registrants 

regarding the need for clarification and corrections in Appendix A, as well as clarification of 

label statements in Table 12, Summary of Labeling Changes for Tetramethrin. Further, in the 

2008 RED, the Agency assessed the indoor aerosol space spray scenario at a maximum 

application rate of 0.25% active ingredient (a.i). To support indoor aerosol space spray products 

up to 0.35% a.i., the registrants submitted a revised Cumulative and Aggregate Risk Evaluation 

System (CARES®) assessment for this scenario and a short-term incidental oral benchmark dose 

(BMD) analysis in order to revise the endpoint for incidental oral exposure. Finally, the 

registrants requested the Agency review existing acute toxicological studies previously submitted 

to the Agency in order to address data gaps identified in the 2008 RED document. 

As a result of these post-RED discussions with the registrants and the review of existing 

and new toxicity data, the Agency has revised the Tetramethrin RED, where appropriate, in order 

to correct any errors, clarify the intent of its risk mitigation captured in Table 12, reflect the 

revised occupational and residential risk assessments, and revise the acute toxicity data gaps and 

data-call in requirements. 

The major revisions to the human health risk assessment and data needs are as follows: 

• The Agency reviewed the Guideline 870.2400 Primary Eye Irritation Testing (MRID# 

41609611) submitted by Sumitomo Chemical Inc., and found the study to be acceptable. 

Therefore, in Section III, Summary of Tetramethrin Risk Assessments, the acute toxicity 

profile (Table 2) was revised to reflect this data requirement as fulfilled and tetramethrin 

as a category III eye irritant. 

• Additionally, the need for Guideline 870.2400 Primary Eye Irritation Testing was 

removed from Section V, Additional Generic Data Requirements. 

• The Agency determined the “Evaluation of Potential Human Health Risks Associated 

with Residential Uses of Tetramethrin: Revised Supplemental – Short-term Oral 

Benchmark Dose Analysis,” (MRID# 47921601) submitted by the registrant on 

November 30, 2009 to be acceptable. As a result, the short-term incidental oral endpoint 

for use in the human health risk assessment was revised from 25 mg/kg/day to 61.1 

mg/kg/day. 

• The occupational handler inhalation risk assessment was revised to reflect the increased 

rate of 0.35% for aerosol space sprays. The revised margin of exposure (MOE) of 9,000 

is below the Agency’s level of concern (LOC), and therefore, continues to be not of 

concern to the Agency (MOEs ≥1,000 are not of concern). 
vii

• The residential handler risk assessment was also revised to reflect the increased rate of 

0.35% for aerosol space sprays. The revised MOE of 54,000 is below the Agency’s 

LOC, and therefore, continues to be not of concern to the Agency. The residential postapplication CARES assessment was also revised to reflect the revised short-term 

incidental oral end-point and the increased use rate for the indoor aerosol space spray. In 

the 2008 RED, the inhalation MOE for this scenario (using a use rate of 0.25% a.i.) was 

not of concern (MOEs ≥ 1,000) at the 99.88th percentile. In the revised CARES 

assessment, this use scenario (with an application rate of 0.35% a.i. and revised incidental 

oral endpoint) is not of concern at the 99.9 percentile (MOE = 1,131), and therefore, is 

eligible for reregistration. The increased use rate of 0.35% is specified in Appendix A. 

 Section 5, What Registrants Need to Do, has been amended to require two additional 

generic data requirements, Guideline 830.7050 UV / Visible Absorption and Guideline 870.7800 

Immunotoxicity. Both are new studies which are now required for all pesticide active 

ingredients. The Additional Product-Specific Data Requirements section has also been amended 

to include efficacy data requirements for public health pests and companion animal studies for 

tetramethrin products used on domestic animals. The determination of which efficacy studies 

would be required for tetramethrin was still on-going at the time of publication of the June 2008 

RED. 

 A number of revisions have also been made to the Summary of Labeling Changes for 

Tetramethrin (Label Table), Table 12, for clarification and to reflect updates in labeling on 

tetramethrin end-use products. Among the updates are the following: 

• The Agency is requiring the following label statements to reduce the potential ecological 

exposure of tetramethrin. While some of the label statements are additions to the Label 

Table, others appeared in Table 12 of the June 28, 2008 Tetramethrin RED document; 

however, they have been revised slightly to be consistent with other pyrethroid nonagricultural outdoor product labeling. 

o Incorporation of PR Notice 2008-1, “Environmental Hazard General Labeling 

Statements on Outdoor Residential Use Products” on appropriate outdoor nonagricultural end-use products. 

o Products labeled for General Outdoor Surface and Space Sprays (except 

outdoor fogging devices): 

“All outdoor applications must be limited to spot or crack-and-crevice treatments 

only, except for the following permitted uses: 

 Treatment to soil or vegetation around structures; 

 Applications to building foundations up to a maximum height of 3 feet. 

Other than applications to building foundations, all outdoor applications to 

impervious surfaces such as sidewalks, driveways, patios, porches and structural 

surfaces (such as windows, doors, and eaves) are limited to spot treatments or 

crack-and-crevice applications, only.” 
viii

o Products labeled for use around or near floor drains must contain the 

following statement: 

 “Application is prohibited directly into sewers or drains, or to any area like a 

gutter where drainage to sewers, storm drains, water bodies, or aquatic habitat can 

occur. Do not allow the product to enter any drain during or after application.” 

o Products labeled for use in drains or sewers must contain the following 

statement: 

“Do not apply directly to sewers or drains, or to any area like a gutter where 

drainage to sewers, storm drains, water bodies, or aquatic habitat can occur, 

except as directed by this label.” 

• The Agency is also including the total release fogger (TRF) labeling requirements, 

intended to improve residential safety, in the Label Table (Table 12). The label 

requirements were sent to the pyrethrins and pyrethroid registrants in a letter dated March 

23, 2010. EPA is requiring the following labeling changes on all TRF by September 30, 

2011, except where manufacturers can satisfactorily explain to the Agency that an 

alternative approach would be adequate to address the causes of bug bomb exposure 

incidents: 

o Bug bomb labels must be written in plain language with clear headings. 

o The new labels must incorporate pictograms to illustrate the following list of 

restrictions and directions for use: 

 do not use multiple canisters in a room 

 do not use in small confined areas 

 turn off ignition sources 

 remove or cover exposed food 

 air out the room before entering 

o Instructions to vacate upon use and air out upon return must be very prominent. 

o Door hang-tags must be provided to inform others to stay out of treated areas. 

• The following entry restriction label statements that appear in the “End-Use Products 

Intended for Occupational Use (WPS and Non-WPS)” section of the Label Table (Table 

12) have been added to the “End Use Products Primarily Used by 

Consumers/Homeowners” section since they apply to applications made by both PCOs 

and consumers. 

o For products that do not contain directions for use that allow people to be 

present during application: 

“Do not enter or allow others to enter treated area until sprays have dried.” 
ix

o For products that contain directions for use that allow people to be present 

during application AND are labeled for use as a directed spray (does not 

apply to products applied directly to domestic animals): 

“Except when (insert application method or site that allows people to be present 

during application), do not enter or allow others to enter treated area until sprays 

have dried.” 

o For products that contain directions for use that allow people to be present 

during application AND are labeled for use as a space spray: 

“Except when (insert application method or site that allows people to be present 

during application), do not enter or allow others to enter until vapors, mists, and 

aerosols have dispersed, and the treated area has been thoroughly ventilated.” 

o For total release foggers labeled for indoor use: 

“Wait at least two (2) hours after application, then open windows, vents and doors 

for two more hours. If an odor is still detected additional ventilation is required.” 

 A number of revisions have been made to Appendix A, Non-Food and Non-Feed Use 

Patterns Subject to the Reregistration of Tetramethrin, to reflect the maximum use rates assessed 

for aerosol space sprays. Furthermore, the Agency clarified Appendix A by including Outdoor 

Jet Sprays (intended for wasp and hornet use) in its own row, with a maximum of 0.20% a.i. and 

1 to 2 second bursts per application. 
x

Abstract 

 

 The Environmental Protection Agency (EPA or the Agency) has completed the human 

health and environmental risk assessments for tetramethrin and is issuing its risk management 

decision. Tetramethrin is not registered for use on food and has no U.S. tolerances associated 

with its use; therefore, it is not subject to Food Quality Protection Act (FQPA). The risk 

assessments, which are summarized below, are based on the review of the required database 

supporting the use patterns of currently registered products and additional data provided by the 

technical registrants, Valent BioSciences Corporation and Sumitomo Chemical Company, Ltd. 

 Tetramethrin is part of the pyrethroid class of pesticides and was first registered in 1968. 

It is a broad spectrum, non-systemic, synthetic pyrethroid used to control flying and crawling 

insects in a number of commercial, horticultural and residential applications. Commercial 

applications include space, broadcast and crack-and-crevice treatment in a variety of 

commercial, industrial, residential, and institutional sites. Horticultural applications include 

foliar and fogger treatment on non-food plants. Residential uses include pest control in homes 

and outdoor domestic structures, on gardens and direct application to cats, dogs and horses. The 

registered uses of tetramethrin are not expected to adversely impact groundwater or surface 

water; therefore, a drinking water assessment was not performed. There are no food uses of 

tetramethrin or potential for dietary exposures, so no dietary risk assessment was conducted. 

Therefore, the reregistration action considered only potential residential (inhalation and 

incidental oral), occupational (inhalation only), and ecological risks. No endpoints were selected 

for dermal exposure because no effects were observed at the limit dose in available acceptable 

dermal toxicity studies. 

For residential handler inhalation risk, calculated Margins of Exposure (MOEs) for all 

scenarios assessed were below the Agency’s Level of Concern (LOC) (MOEs ≥ 1,000) and 

therefore, are not of concern. For residential post-application inhalation and incidental oral risks, 

the MOEs are all greater than the target MOE of 1,000 at the 99.9 percentile of the CARES 

probabilistic risk assessment and are also not of concern. 

 Occupational handler and post-application inhalation exposures were assessed. All of 

the MOEs are greater than the Agency’s target occupational MOE of 1,000 without respirators, 

and therefore, the inhalation risks are not of concern. The MOEs for the occupational postapplication scenarios assessed exceed the Agency’s target MOE of 1,000 and are not of concern. 

 The Agency evaluated potential ecological risk from both indoor and outdoor uses of 

tetramethrin. Although the Agency believes exposure to non-target organisms is unlikely, 

tetramethrin is considered highly toxic to aquatic organisms. Therefore, the Agency is limiting 

all outdoor uses to localized spot and crack and crevice treatments, with the exception of (1) 

barrier, perimeter or band applications to soil or vegetation around structures; and (2) band 

applications to building foundations, up to a maximum of 3 feet up the walls of the building. 

Since outdoor uses will be limited to spot treatments, no additional mitigation measures for these 

uses are required. Although these limitations will reduce exposure to tetramethrin, there could 

be a potential for direct effects for Listed insects or indirect effects to plants if they have an 

obligate relationship with a Listed insect pollinator.
1

I. Introduction 

 The Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) was amended in 1988 

to accelerate the reregistration of products with active ingredients registered prior to November 

1, 1984. The amended Act calls for the development and submission of data to support the 

reregistration of an active ingredient, as well as a review of all submitted data by the EPA. 

Reregistration involves a thorough review of the scientific database underlying a pesticide’s 

registration. The purpose of the Agency’s review is to reassess the potential risks arising from 

the currently registered uses of the pesticide, to determine the need for additional data on health 

and environmental effects, and to determine whether or not the pesticide meets the “no 

unreasonable adverse effects” criterion of FIFRA. 

 

This document summarizes EPA’s human health and ecological risk assessments and 

reregistration eligibility decision (RED) for tetramethrin. The document consists of six sections. 

Section I contains the regulatory framework for reregistration; Section II provides an overview 

of the chemical and a profile of its use and usage; Section III gives an overview of the human 

health and environmental effects risk assessments; Section IV presents the Agency's decision on 

reregistration eligibility and risk management; and Section V summarizes the label changes 

necessary to implement the risk mitigation measures outlined in Section IV. Finally, the 

Appendices list related information, supporting documents, and studies evaluated for the 

reregistration decision. The risk assessments for tetramethrin and all other supporting documents 

are available in the Office of Pesticide Programs (OPP) public docket 

(http://www.regulations.gov) under docket number EPA-HQ-OPP-2008-0014. 
2

II. Chemical Overview

A. Regulatory History 

Tetramethrin was first registered in the United States in 1968. Current technical 

registrants include Valent BioSciences Company and Sumitomo Chemical Corporation. 

Tetramethrin is on reregistration List B; thus no Registration Standard was completed. 

 Currently, there are 58 end-use registrants and approximately 300 end-use products 

containing tetramethrin, of which approximately 30 are manufacturing formulations. 

Tetramethrin is not registered for direct application to agricultural crops and there are no food 

tolerances for specific raw agricultural commodities. There are no proposed new uses by any of 

the registrants for tetramethrin as part of this reregistration. 

Prior to the reregistration of this active ingredient, the registrants have requested and the 

Agency has approved a number of amendments to delete uses or certain registrations for 

products containing tetramethrin. From 1996 through 2007, the registrants canceled all 

greenhouse uses of tetramethrin and have also voluntarily canceled certain tetramethrin products. 

These regulatory actions were published in the Federal Register for public comment and were 

subsequently approved by the Agency.

B. Chemical Identification

TETRAMETHRIN: 

N

O

O O

O

Tetramethrin, [(1,3,4,5,6,7-hexahydro-1,3-dioxo-2H-isoindol-2-yl)methyl 2,2-dimethyl3-(2-methyl-1-propenyl)cyclopropanecarboxylate] is a mixture of four stereoisomers designated 

as 1R - trans, 1R – cis, 1S – trans, and 1S – cis in an approximate ratio of 4:1:4:1. The first two 

isomers are the most insecticidally active, and a mixture of the two has been termed ‘dtetramethrin’ and has the trade name Neo-Pynamin Forte (Sumitomo). Neo-Pynamin Forte is not 

registered in the U.S., but toxicity data on this material have been submitted to fulfill data 

requirements for tetramethrin. 

Common Name: Tetramethrin 
3

Chemical Name: (1,3,4,5,6,7-hexahydro-1,3-dioxo-2H-isoindol-2-yl)methyl 2,2-

dimethyl-3-(2-methyl-1-propenyl)cyclopropanecarboxylate 

Chemical Class: Synthetic pyrethroid 

Case Number: 2660 

EPA Chemical (PC) Code: 069003 

CAS Number: 7696-12-0 

Empirical Formula: C19H25NO4

Technical Registrants: Valent BioSciences Corporation 

Sumitomo Chemical Company 

Table 1. Physicochemical Properties of Technical Grade Tetramethrin. 

Parameter Value 

Melting point/range 68 - 70 °C 

Molecular Weight 331.4 g/mol 

Density 1.1 specific gravity at 20 °C 

Water solubility 1.83 mg/L at 25 °C 

Solvent solubility >2 g/100 mL in acetone, ethanol, methanol, hexane and n-octanol 

Vapor pressure 0.944 mPa at 30 °C 

Dissociation constant, pKa Not available 

Octanol/water partition coefficient, 

Log(KOW) 

log Pow = 4.6 at 25 °C 

UV/visible absorption spectrum Not available 

C. Use Profile

 

 The following information on the currently registered uses includes an overview of use 

sites and application methods. A detailed table of the uses of tetramethrin eligible for 

reregistration is contained in Appendix A. 

Type of Pesticide: Tetramethrin is a broad-spectrum, first-generation synthetic pyrethroid 

insecticide. Pyrethroids are synthetic esters derived from naturally occurring pyrethrins 

(insecticides derived from the extract of chrysanthemum flowers). Tetramethrin is a rapid 

knockdown agent against flying and crawling insects. Tetramethrin may be co-formulated with 

synergists (e.g., PBO and MGK-264), other active ingredients such as pyrethrins and other 

pyrethroids (e.g., permethrin, allethrins, phenothrin, resmethrin, and cypermethrin), and growth 

inhibitors (e.g., fenoxycarb) for greater effectiveness and to control a broader spectrum of insect 

pests. These other active ingredients are more persistent than tetramethrin and provide residual 

activity against insects not exposed initially. 

Target Organisms: The primary target pests are flying and crawling insects such as wasps, 

hornets, roaches, ants, fleas, and mosquitoes. 
4

Mode of Action: Tetramethrin is a type 1 pyrethroid (i.e., lacking a cyano group at the α carbon 

position of the alcohol moiety). Type 1 pyrethroids act on axons in the peripheral and central 

nervous system by interacting with sodium channels in mammals and/or insects. Tetramethrin is 

a nerve cell membrane sodium channel modulator, which interferes with entrance of sodium ions 

into the channel, leading to hyperactivity of the nervous system which can result in paralysis 

and/or death. 

Use Sites: Commercial applications include space sprays, broadcast surface treatments, and 

crack and crevice treatments in a variety of industrial and institutional sites including: indoor 

non-food areas; animal premises (not used for human consumption); and outdoors as localized 

space and contact sprays on ornamental plants and perimeter treatments (sidewalks, 

entranceways, outside surfaces of buildings, etc.). 

Residential uses include: pest control in homes as a space spray, general surface spray, spot and 

crack and crevice applications, on house plants, clothing and bedding, pet premises, and direct 

applications to pets. Outdoors it is used as localized space and contact spray on ornamental 

plants and perimeter treatments (sidewalks, decks, patios, outside surfaces of buildings, etc.). 

Horticultural applications include foliar and fogger treatment on non-food plants. There are no 

registered food use applications for tetramethrin.

Use Classification: Tetramethrin products are designated as general use. However, some enduse products indicate they are for use by pest control operators (PCOs) only. 

Formulation Types: Pressurized liquid, ready-to-use (RTU) liquids, emulsifiable concentrates, 

and liquid concentrates. 

Application Methods: Tetramethrin is applied by aerosol can, handheld sprayers, foggers, and 

mechanical sprayers. 

Application Rates: Tetramethrin application rates vary depending on the use pattern, indoor or 

outdoor use, and consumer and professional or commercial operator use. Typical concentrations 

of active ingredient (a.i.) in residential use products, including ready to use (RTU) (e.g., ant and 

roach sprays, wasp and hornet sprays) and indoor and outdoor aerosols or aqueous sprays for 

crawling and flying insects, range between 0.1 % and 0.35%. Indoor total release foggers are 

typically around 0.54% a.i. Sprays designed for use on pets are typically 0.063% a.i. 

Emulsifiable concentrate formulations are approximately 2.5% a.i. The maximum single 

application rate to an outdoor site is 0.00002 lb a.i./sq ft. 

Application Timing: Tetramethrin is typically labeled for use “as needed.” 

D. Estimated Usage of Pesticide 

 Based on data provided to the Agency by the tetramethrin registrants, it appears that 

tetramethrin usage has increased over the past few years. This is likely due to the fact that 

pyrethroids are alternatives to several organophosphate pesticides, which are no longer registered 
5

for indoor residential areas. The Agency estimates annual usage of tetramethrin to be between 

15,000 and 30,000 pounds (lbs) a.i. However, tetramethrin use data is extremely limited and 

difficult to interpret because tetramethrin products may be stored for periods of time and 

produced only as inventory is exhausted. In addition, based on its localized use pattern and “use 

as needed” directions, sales or production data does not accurately reflect usage. 

 Based on use information provided to the Agency by the tetramethrin registrants, the 

majority of tetramethrin use is in residential outdoor spaces. It appears residential indoor use 

sites and institutional and industrial sites make up a small percentage of tetramethrin use. 

Further, tetramethrin is primarily used by residential consumers as opposed to PCOs. Sources 

suggest that less than 1,000 lbs a.i. are used annually by professional applicators. 
6

III. Summary of Tetramethrin Risk Assessments 

 The following is a summary of EPA’s revised human health and ecological risk 

assessments for tetramethrin, as presented fully in the documents, Tetramethrin Risk Assessment 

for Reregistration Eligibility Decision, dated June 18, 2008 and subsequent supplemental 

assessments discussed below and the Revised Environmental Fate and Ecological Risk 

Assessment for the Re-registration Eligibility Decision on Tetramethrin, dated February 5, 2008, 

respectively. The purpose of this summary is to assist the reader by identifying key features and 

findings of these risk assessments, and to help the reader better understand conclusions reached 

in the assessments. 

 The human health and ecological risk assessment documents and supporting information 

listed in Appendix C were used to reach the safety finding and regulatory decision for 

tetramethrin. While the risk assessments and related addenda are not included in this document, 

they are available from the OPP Public Docket, located at http://www.regulations.gov, under 

docket number EPA-HQ-OPP-2008-0014. 

 Tetramethrin risk assessments rely in part on data from studies in which adult human 

subjects were intentionally exposed to a pesticide to determine their dermal and inhalation 

exposure. Many such studies, involving exposure to many different pesticides, comprise generic 

pesticide exposure databases such as the Pesticide Handlers Exposure Database (PHED). EPA 

has reviewed all the studies in these multi-pesticide generic exposure databases, and on the basis 

of available evidence has found them to have been neither fundamentally unethical nor 

significantly deficient relative to standards of ethical research conduct prevailing when they were 

conducted. There is no regulatory barrier to continued reliance on these studies, and all 

applicable requirements of EPA’s Rule for the Protection of Human Subjects of Research (40 

CFR Part 26) have been satisfied. 

A. Human Health Risk Assessment 

 The human health risk assessment incorporates all sources of potential exposure, hazard, 

and risks, including both residential and occupational applications. There are no registered food 

uses for tetramethrin, and the majority of use is in consumer home products (indoor and outdoor 

surface and space sprays). There are also commercial and horticultural uses for tetramethrin. 

The Human Health Tetramethrin Risk Assessment for Registration Eligibility Decision

document was completed on June 18, 2008. Since the completion of the Human Health Risk 

Assessment, the registrants requested the Agency review existing acute primary eye irritation data, 

and also submitted a benchmark dose (BMD) analysis of the toxicity endpoint for incidental oral 

exposures. The Agency’s review of the BMD analysis, Tetramethrin: Benchmark Dose 

Analysis of Toxicity Endpoint for Incidental Oral Exposure, dated January 6, 2010, found the 

BMD analysis to be acceptable, and consequently, the short-term incidental oral end point was 

revised. The Agency also revised the occupational and residential handler risk assessments, as 

well as the residential post-application CARES portion of the Tetramethrin: Phase IV Revised 

Occupational and Residential Exposure Assessment and Recommendations for the 

Reregistration Eligibility Decision, dated June 13, 2008. Major revisions to the tetramethrin 

human health risk assessment include the following: 
7

• The acute toxicity profile (Table 2) was revised to reflect the acute eye irritation 

data requirement as fulfilled and tetramethrin as a category III eye irritant. 

• The short-term incidental oral toxicity end point has been revised to 61.1 

mg/kg/day based on the BMD analysis. 

• Occupational and residential handler exposure and risks were revised from the 

previous assessment to reflect use of the 0.35% tetramethrin aerosol space spray. 

• Revision of the CARES portion of the Residential Exposure Assessment 

considered the revised incidental oral endpoint and the use of the 0.35% 

tetramethrin aerosol space spray. 

For more information on the human health risk assessment, and the revisions to toxicity 

and residential portions, see Tetramethrin Risk Assessment for Registration Eligibility Decision, 

dated June 18, 2008; HED Review of Evaluation of Potential Human Health Risks Associated 

with Residential Uses of Tetramethrin: Supplemental Assessment for Indoor Space Spray, dated 

April 27, 2009; Tetramethrin: Benchmark Dose Analysis of Toxicity Endpoint for Incidental 

Oral Exposure, dated January 6, 2010; and the HED Review of Evaluation of Potential Human 

Health Risks Associated with Residential Uses of Tetramethrin: Revised Supplemental – ShortTerm Oral Benchmark Dose Analysis, dated February 25, 2010, which are available under docket 

number EPA-HQ-OPP-2008-0014. 

1. Toxicity of Tetramethrin 

 Toxicity assessments are designed to predict whether a pesticide could cause adverse health 

effects in humans (including: short-term or acute effects, such as skin or eye damage; and lifetime or 

chronic effects, such as cancer, developmental effects, or reproductive effects), and the level or dose at 

which such effects might occur. 

 The toxicity database for tetramethrin contains acceptable acute toxicity, subchronic, 

chronic, oncogenecity, and mutagenecity studies. However, the database lacks acceptable 

developmental studies and acceptable acute neurotoxicity, subchronic neurotoxicity, and 

developmental neurotoxicity (DNT) studies. Although developmental and neurotoxicity studies 

are available, these studies are considered inadequate based on the use of 

carboxymethylcellulose (CMC) as the dosing vehicle. CMC has been found to decrease the 

absorption rate and thereby lessen the potency and toxicity of pyrethroid compounds. Concerns 

regarding studies on pyrethroid compounds that used CMC as a vehicle are discussed in 

published literature and further emphasized in a EPA report released in a July 18, 2007 draft 

document, “Assessing Approaches for the Development of PBPK Models of Pyrethroid 

Pesticides” prepared jointly by EPA’s Office of Pesticide Programs and Office of Research and 

Development. Therefore, new developmental toxicity, and acute, subchronic, and developmental 

neurotoxicity studies utilizing an appropriate dosing vehicle are required to fully evaluate 

potential risks from exposure to tetramethrin. 

Since the tetramethrin database is currently incomplete with respect to data on 

developmental and neurotoxicity studies, the Agency applied a ten-fold (10x) database 

uncertainty factor (UFDB) to account for this lack of data. 
8

a. Acute Toxicity Profile 

 

 Tetramethrin is slightly toxic (Toxicity Category III or IV) by the oral and dermal routes 

of exposure, and is a Category III eye irritant. However, in acute oral studies in mice with 

technical tetramethrin and/or neopynamin forte, clinical signs sometimes included hyperexcitability, muscular fibrillation, tremor, ataxia, limb paralysis, irregular respiration, 

lacrimation, and salivation. These effects were also seen in acute percutaneous studies in rats. 

As presented in Table 2, acceptable data on the acute inhalation toxicity, acute dermal irritation, 

and skin sensitization for technical tetramethrin are unavailable. The Agency is requiring these 

data. 

Table 2. Acute Toxicity Profile – Tetramethrin (Neopynamin)

Guideline 

No. Study Type MRID Results Toxicity Category 

870.1100 Acute oral [rat]* 42146405 LD50 > 5,000 mg/kg IV 

870.1200 Acute dermal [rat] 00063574 

42146405 

LD50 > 5,000 mg/kg IV 

870.1200 Acute dermal [rabbit] 40276101 LD50 > 2,000 mg/kg III 

870.1300 Acute inhalation [rat] -- -- No data 

870.2400 Acute eye irritation [rabbit] 41609611 -- III 

870.2500 Acute dermal irritation [rabbit] -- -- No data 

870.2600 Skin sensitization [guinea pig] -- -- No data 

* Clinical signs of neurotoxicity (e.g., hyper-excitability, muscular fibrillation, tremor, ataxia etc.) were present at 

2,500 and 5,000 mg/kg/day in acute oral studies in rodents. 

b. Toxicological Endpoints 

The toxicological endpoints used in the human health risk assessment for tetramethrin are 

listed in Table 3 below. There are no registered food uses for tetramethrin and dietary and 

drinking water exposure to tetramethrin is not expected based on use patterns. Therefore, acute 

and chronic reference doses are not required and were not selected for this assessment. Noncancer endpoints were selected for inhalation and incidental oral exposures only. 

The short-term incidental oral endpoint was selected from a two-generation rat 

reproduction study (MRID 00161842) with 1 litter per generation. The no observed adverse 

effect level (NOAEL) is 50 mg/kg/day and the lowest observed adverse effect level (LOAEL) is 

300 mg/kg/day based on decreased body weight and food consumption in both sexes of F0 and 

F1 parental animals and decreased pup body weight during lactation. A benchmark dose (BMD) 

analysis was performed to determine the short-term incidental oral endpoint. A BMD is defined 

as an exposure due to a dose of a substance associated with a specified low incidence of risk, 

generally in the range of 1% to 10%, of a health effect; or the dose associated with a specified 

measure or change of a biological effect. The selected toxicological endpoint of 61.1 mg/kg/day 

was based on decreased offspring body weight on day 21 in the F0 and F1 generations. 

There are no dermal absorption studies available with tetramethrin. However, based on 

available dermal absorption studies in pyrethrins/pyrethroid compounds, dermal absorption of 

tetramethrin is expected to be very low (i.e., less than 2%). Tetramethrin was tested in a 21-day 
9

dermal toxicity study in rats (MRID 41995004) at doses of 0, 100, 300, or 1,000 mg/kg/day in 

5/sex/dose Sprague-Dawley rats. There were no treatment-related systemic toxic effects and a 

LOAEL was not established. No endpoints were selected for dermal exposure because no effects 

were observed at the limit dose in available acceptable dermal toxicity studies. 

The short and intermediate term inhalation exposure endpoint was selected based on two 

90-day inhalation toxicity studies in rats conducted in 1991 (MRIDs 42012101 and 41995003). 

The systemic toxicity NOAEL of 19.8/20.3 mg/m3 (3.5 mg/kg/day) was selected based on: 

increased clinical signs (irregular respiration and bradypnea); decreased body weight gain; 

changes in hematology, urinalysis, and blood chemistry; gross necropsy findings in liver; 

hepatocellular hypertrophy; and hyaline droplets in kidney in both sexes at the LOAEL of 134 

mg/m3 (23.5 mg/kg/day). 

 A combined uncertainty factor or margin of exposure (MOE) of 1,000 for residential and 

occupational scenarios is based on the standard 10x for interspecies extrapolation and 10x for 

intraspecies variation, plus an additional database uncertainty factor (UFDB) of 10x for the 

absence of adequate neurotoxicity studies, since the nervous system is the target site for 

tetramethrin. Based on the Agency’s review of existing pyrethroid data, EPA has come to the 

conclusion that the development neurotoxicity study (DNT) is not a particularly sensitive study 

for comparing the sensitivity of young and adult animals to pyrethroids. EPA has recently 

determined that, as an alternative to the generation and submission of a new DNT study, 

pyrethroid registrants may instead choose to cite the six previously submitted DNT studies for 

pyrethroid pesticides1. The Agency is also investigating the need for additional experimentation, 

specific to the mode of action and pharmacokinetic characteristics of pyrethroids, to evaluate the 

potential for increased susceptibility of young organisms. Therefore, the Agency is maintaining 

the 10x database uncertaintly factor to account for the outstanding neurotoxicity data gap. The 

10x database uncertainty factor is also applicable to workers because occupational exposures 

may pose neurotoxic and developmental risk concerns. The uncertainty factors (UF) used to 

account for interspecies extrapolation and intraspecies variability are also described in Table 3. 

Table 3. Summary of Toxicological Doses and Endpoints for Tetramethrin for Use in Human Risk 

Assessments 

Exposure 

Scenario 

Dose Used in Risk 

Assessment, UF 

Safety Factor and 

Level of Concern 

Study and Toxicological Effects 

Acute and Chronic 

Dietary 

(general population) 

Acute and Chronic RfD’s were not selected because there are no registered food uses 

Short-Term 

Incidental Oral 

(1 - 30 days) 

BMDL5 = 61.1 

mg/kg/day 

UFA=10 

UFH = 10 

UFDB = 10 

Residential LOC for 

MOE = 1,000 

Occupational LOC for 

MOE = N/A 

2-Generation Reproduction (rats) 

The NOAEL is 50 mg/kg/day and the 

LOAEL is 300 mg/kg/day based on 

decreased body weight and food 

consumption in both sexes of F0 and 

F1 parental animals and decreased pup 

body weight during lactation. 

 

1 These conclusions and determinations were communicated to registrants of some pyrethroid active ingredients in a 

letter from EPA dated September 4, 2009 (available from the public docket EPA-HQ-OPP-2008-0331-0027). 

Further details are also available from the website http://www.epa.gov/oppsrrd1/reevaluation/pyrethroidspyrethrins.html.
10

Table 3. Summary of Toxicological Doses and Endpoints for Tetramethrin for Use in Human Risk 

Assessments 

Exposure 

Scenario 

Dose Used in Risk 

Assessment, UF 

Safety Factor and 

Level of Concern 

Study and Toxicological Effects 

Short-, 

Intermediate- Term 

Dermal 

 (1 - 30 days, 

1-6 months) 

No risk is expected from this exposure scenario as no hazard was identified in a 21/28 day 

dermal toxicity study conducted at the limit dose of 1,000 mg/kg/d. 

Inhalation 

Short-, 

Intermediate-Term 

(1 - 30 days, 1-6 

months) 

Inhalation NOAEL = 

19.8 mg/m3 (3.5 

mg/kg/day (oral 

equivalent) 

UFA=10 

UFH = 10 

UFDB = 10 

Residential LOC for 

MOE = 1,000 

Occupational LOC for 

MOE = 1,000 

90 Day Inhalation Toxicity (rats) 

LOAEL = 134 mg/ m3 (23.5 

mg/kg/day) based on ↑ clinical signs, 

absolute/relative kidney and liver 

weights; ↓ body weight, changes in 

hematology, urinalysis, hypertrophic 

and gross liver necropsy findings, and 

hyaline droplets in the kidney 

Cancer (oral, 

dermal, inhalation) 

Group C, possible human carcinogen based on evidence of benign testicular tumors in rats 

and increased hepatocellular carcinomas in male mice at the HDT of 1134 mg/kg/day. Based 

on a recent review of the cancer data, HED has determined that tetramethrin would likely be 

reclassified under EPA’s 2005 Guidelines for Carcinogen Risk Assessment as “Suggestive 

Evidence of Carcinogenic Potential.” 

UF = uncertainty factor (A= Animal/Interspecies, H= Human/Intraspecies, DB=Data Base) 

NOAEL = no observed adverse effect level 

LOAEL = lowest observed adverse effect level 

MOE = margin of exposure 

LOC = level of concern 

N/A = Not Applicable 

2. Carcinogenicity of Tetramethrin 

The Agency concluded that, based on the available information, tetramethrin meets the 

criteria for Group C, possible human carcinogen. Tetramethrin administered to Sprague-Dawley 

rats was associated with a statistically significant dose-related increase in the incidence of 

interstitial cell adenomas in the testes in mid- and high-dose males. These results were 

reproducible in a second study in Sprague-Dawley rats and another study in Long-Evans rats. 

This increase was outside the historical control range for Sprague-Dawley rats. No historical 

control data were available on Long-Evans rats. Tetramethrin administration to B6C3F1 mice did 

not alter the spontaneous tumor profile for this strain of mice. Therefore, the Agency determined 

that no chronic cancer risk assessment was necessary. The Agency based its decision on the fact 

that this type of tumor (interstitial cell adenomas of the testes) is a benign tumor that does not 

progress to a malignant tumor in rats; the tumors occurred at a later stage of the study; the 

exposure started in utero; and the treatment did not cause reduction in latency. 

3. Metabolites and Degradates 

The Agency reviewed the metabolism of tetramethrin (MRIDs 42448901 and 42448902), and 

concluded that for risk assessment, the parent compound, tetramethrin, is the only residue of 

toxicological concern. For additional details, refer to the Tetramethrin Risk Assessment for 

Registration Eligibility Decision, dated June 18, 2008. 
11

4. Dietary Exposure and Risk (Food and Water) 

 Tetramethrin currently has no registered food uses and there are no tolerances for specific 

raw agricultural commodities. Tetramethrin is not registered for direct application to agricultural 

crops, livestock animals, or livestock premises, where livestock are used for food. Although 

there are no registered food uses for tetramethrin, there are uses in the home where food may be 

exposed (e.g., kitchens), but labels for these uses have restrictions to prevent / limit food 

exposure such as, “In the home, all food-processing surfaces and utensils should be covered 

during treatment or thoroughly washed before use. Cover exposed food.” Therefore, dietary 

exposure is not of concern. 

The Agency did not conduct a quantitative drinking water assessment for tetramethrin, 

given the limited extent of potential exposure and the chemical’s environmental fate properties. 

Tetramethrin is used by individual homeowners or industrial / commercial property owners, in 

individual, isolated areas, and in small amounts as opposed to wide scale uses (i.e., for 

agriculture or mosquito abatement by public authorities). Because tetramethrin products are not 

expected to adversely impact groundwater or surface water (the sources of drinking water), a 

quantitative drinking water assessment is not warranted. 

 

5. Residential Exposure and Risk 

Residential exposure assessments consider all potential non-occupational pesticide 

exposure. Tetramethrin has a wide variety of residential uses, including use in/on indoor and 

outdoor surfaces, and use on pets. Therefore, the Agency has determined that there is a potential 

for exposure to tetramethrin in residential settings for homeowners who handle (mix, load, and 

apply) products containing tetramethrin, as well as post-application exposure from entering 

tetramethrin-treated areas. Non-occupational post-application exposures can result following use 

of pesticides by homeowners themselves or following applications by professional pest control 

operators in residential or non-residential settings. 

Risk assessments have been completed for both residential handler (inhalation only) and 

post-application scenarios (inhalation and incidental oral). Though dermal exposure is possible 

and expected for residential handler and post-application scenarios of tetramethrin, the Agency 

determined a dermal assessment was not necessary because no systemic effects were observed at 

the limit dose in dermal toxicity studies in animals. 

 To estimate residential (inhalation and incidental oral) risks, the Agency calculates a 

margin of exposure (MOE), which is the ratio of the toxicity endpoint (NOAEL or BMDL) 

selected for risk assessment to the exposure value. The MOE is then compared to a level of 

concern (LOC), which is the same value as the uncertainty factor (UF) applied to a particular 

toxicity study. The standard UF is 100x (10x to account for interspecies extrapolation and 10x 

for intraspecies variation). However, since the tetramethrin database is currently incomplete, the 

Agency applied a ten fold (10x) database uncertainty factor (UFDB) to account for this lack of 

certain data; thus, for residential exposures to tetramethrin, MOEs greater than the target LOC of 

1,000 are not of concern to the Agency. For detailed information on the residential risk 

assessment, see the Tetramethrin Risk Assessment for Registration Eligibility Decision, dated 
12

June 18, 2008; HED Review of Evaluation of Potential Human Health Risks Associated with 

Residential Uses of Tetramethrin: Supplemental Assessment for Indoor Space Spray, dated April 

27, 2009; and the HED Review of the Evaluation of Potential Human Health Risks Associated 

with Residential Uses of Tetramethrin: Revised Supplemental Short-Term Oral Benchmark Dose 

Analysis, dated February 25, 2010. 

a. Residential Handler Risks 

 The Agency determined that exposure to homeowners handling a tetramethrin product is 

likely to occur via the inhalation route during the residential use of tetramethrin in a variety of 

indoor and outdoor settings. The risk assessment considered three major residential exposure 

scenarios, based on the types of equipment and techniques that can potentially be used to make 

tetramethrin applications. While some tetramethrin products are packaged as RTU trigger 

sprayer bottles, the handler risks calculated from aerosol can application are protective of risks 

from trigger sprayer applications because the unit exposure values are lower for trigger sprayer 

application. The Agency only considered short-term (1-30 days) inhalation exposure due to 

infrequency of use associated with homeowner products and the non-persistence of tetramethrin. 

Additionally, as discussed above, dermal exposures were not assessed, because no effects were 

observed at the limit dose in available acceptable dermal toxicity studies. The following 

scenarios were assessed: 

• Mix / Load / Apply liquids with a backpack sprayer or low pressure hand wand. 

• Aerosol can application 

• Load / Apply liquids with a trigger-pump sprayer. 

 Pesticide handler exposure database (PHED) unit exposure values were used to assess 

exposures, because chemical-specific monitoring data were not available. The following 

assumptions were also used in estimating risks from residential handler exposure to tetramethrin: 

• The body weight of an adult handler is 70 kg. 

• The amount handled per day is based on formulation type:

o Aerosol can: One 16 ounce can is used per day.

o Trigger- pump Sprayer: 1 gallon of diluted solution per day.

o Low-pressure handwand sprayer: 5 gallons of diluted solution per day. 

 Table 4 summarizes the inhalation risk estimates for residential handlers of tetramethrin 

products. All MOEs are well below the Agency’s LOC (MOEs ≥ 1,000 are not of concern), with 

values ranging from 54,000 to 100,000. 

Table 4. Residential Handler Risk Estimates from General Spray Applications 

Exposure Scenario Application Rate Amount Sprayed per 

Day 

Pound a.i. 

handled per day Inhalation MOE 

M/L/A Liquids with 

LP Hand-wand or 

Backpack Sprayer 

0.02 lb a.i./gallon 

solution 5 gallons 0.1 82,000 

Aerosol Can 0.35% a.i. 1 can (16 oz ea) 0.0025 54,000 
13

Table 4. Residential Handler Risk Estimates from General Spray Applications 

Application 

L/A RTU with a 

Trigger-pump 

Sprayer 

0.02 lb a.i./gallon 

solution 1 gallon 0.02 100,000 

M/L/A = Mix / load / apply 

LP = Low pressure 

L/A = Load / apply 

RTU = Ready-to-use 

b. Residential Post-Application Risks 

The Agency uses the term “post-application” to describe exposures to individuals that 

occur as a result of being in an area that has been previously treated with a pesticide. Unlike 

residential handler exposure, where the Agency assumed only adults will be handling and 

applying tetramethrin products, individuals of varying ages can potentially be exposed when 

reentering or performing activities in areas that have been previously treated. Tetramethrin can 

also be used on pets, which can lead to exposure by contact with the treated animals. 

 Tetramethrin post-application incidental oral exposures may occur after applications are 

made to residential areas resulting in residues on surfaces, such as carpets and vinyl flooring. 

Post-application inhalation exposures are possible from residue concentrations in air following 

applications such as space sprays and fogging applications. Post-application incidental oral 

exposures were assessed for children only, and inhalation exposures were assessed for both 

adults and children. Again, dermal exposures were not assessed, because no effects were 

observed at the limit dose in available acceptable dermal toxicity studies. The following 

scenarios were assessed: 

• Inhalation exposure (adults and children) indoors: 

o Space spray and total release fogger; 

• Inhalation exposure (adults and children) outdoors: 

o Handheld foggers and aerosols; 

• Incidental oral ingestion (children only) of residues indoors: 

o Total release aerosol fogger treatment, 

o Aerosol and spray surface treatments, 

o Aerosol and spray treatments to pets; and, 

• Incidental oral ingestion (children only) of residues outdoors: 

o Handheld fogger applications, and 

o Aerosol surface treatments. 

The Agency assessed the post-application exposure to tetramethrin using two approaches: 

a deterministic approach and a probabilistic approach. A deterministic approach uses a point 

estimate from a data set, e.g., a single maximum value or an average value, as an input variable 

in the exposure model. This approach does not consider the range of potential exposures 

incurred by members of a population and does not describe the potential or probability of 

exposure to individuals within a population. Rather, the deterministic approach produces an 

output value that represents the potential exposure or risk of a group; depending on how the 
14

estimate was generated, the output value may reflect a “central tendency,” a “high-end,” or an 

“upper-bound.” In contrast, a probabilistic approach uses the full range of available data and 

produces a distribution of values as output, and is recognized as a refinement over the 

deterministic assessment. More detail is provided below regarding the probabilistic risk 

assessment. 

 

i. Deterministic Risk Approach and Assessment 

 The February 5, 2008, Tetramethrin: Phase 1 Revised Occupational and Residential 

Exposure Assessment and Recommendations for the Reregistration Eligibility Decision presented 

results of the Agency’s deterministic post-application risk assessment. Risks of concern were 

identified for hand-to-mouth exposures following indoor aerosol can space spray treatments 

(MOEs of 290 and 430 for children on carpet and vinyl, respectively), inhalation exposure 

following indoor aerosol can treatments (MOE of 850 for children), and hand-to-mouth exposure 

following indoor ready-to-use liquid spray treatments (MOEs of 570 and 840 for children on 

carpet and vinyl, respectively). Because these risks of concern were identified using the 

screening-level deterministic approach, a more refined probabilistic assessment was conducted 

for the residential post-application exposure scenarios. 

ii. Probabilistic Risk Approach and Assessment 

 In the Tetramethrin Risk Assessment for Registration Eligibility Decision, dated June 18, 

2008, the Agency presents the results of the probabilistic exposure assessment, using the 

Cumulative and Aggregate Risk Evaluation System (CARES® Version 3.0; http://cares.ilsi.org/), 

a publicly available software program. Probabilistic exposure assessment is recognized as a 

refinement over deterministic assessment because it allows users to identify percentiles of risk by 

using inputs in the form of distributions rather than point estimates. In the HED Review of the 

Evaluation of Potential Human Health Risks Associated with Residential Uses of Tetramethrin: 

Revised Supplemental Short-Term Oral Benchmark Dose Analysis, dated February 25, 2010, the 

CARES assessment was revised to reflect the revised short-term oral endpoint and the use rate of 

0.35% a.i. for indoor aerosol applications. 

 

a. Tetramethrin CARES Post-Application Risk Assessment 

 The Agency completed a CARES probabilistic residential exposure and risk assessment, 

which verified the CARES assessment that was submitted by tetramethrin registrants Valent 

BioSciences Corporation; Sumitomo Chemical Company, LTD; S. C. Johnson & Son, Inc.; and 

McLaughlin Gormley King Company. CARES utilizes a reference population of 100,000 

individuals selected from the 1990 U.S. Census. It is considered appropriate for use in exposure 

analysis due to its similarity with the U.S. Census Public Use Micro Data Sample (PUMS), a 

statistically representative dataset that contains data for statistical weights from sampled 

individuals of the general U.S. population, provided by the U.S. Department of Commerce, 

Bureau of the Census, Economics and Statistics Administration. Key sub-populations relevant to 

exposure analysis within CARES include different races (e.g., white, black, Hispanic, etc.) and 

different age groups (e.g., children 1-3 years old, male 20-54 years old, etc.) (Driver et al, 2008). 
15

 CARES simulates daily (24-hour) exposures over the course of one calendar year for 

each person in the specified sub-population based on user-specified routes of exposure (e.g., 

dietary, dermal, non-dietary ingestion), empirical data, and exposure algorithms. It can provide 

cumulative exposures for more than one chemical, aggregate across exposure routes, and provide 

results for different exposure patterns (e.g., acute or chronic exposures). Additionally, each input 

(e.g., chemical residue, exposure duration, and mouthing behavior) is described and used as a 

distribution in a Monte Carlo simulation to identify percentiles of risk and enable users to 

conduct analyses to identify major exposure contributors. 

 The calculations and algorithms used to estimate exposure for the various scenarios and 

routes are consistent with standard Agency practice for residential pesticide exposure 

assessment. Risks of concern were not identified for residential handler scenarios in the 

deterministic assessment; therefore, the CARES assessment considered only post-application 

exposure routes. The tetramethrin exposure scenarios were assessed using standard EPA 

algorithms for exposure estimation. Distributional inputs were included in the probabilistic 

assessment where possible. The probabilistic assessment assumes post-application exposure 

occurs on the “day of application,” which is the most conservative assumption. 

 The tetramethrin CARES assessment calculated risk for adults (defined as males and 

females 20 - 49 years old) and children (defined as males and females 1 - 2 years old). Though 

older or younger children may be exposed to tetramethrin, the selection of 1 - 2 year olds is 

appropriate since this age group exhibits the highest degree of mouthing behavior – a major route 

of exposure for this assessment (Tulve et al., 2002). Combined male/female populations are also 

appropriate since the toxicological endpoints used in the risk assessment are not gender specific. 

The risk percentages generated by the CARES model correspond only to those individuals who 

use tetramethrin as a pesticide (i.e., the population is “users only”) and those that reside within 

the home. The assessment does not characterize risk relative to the percentage of the population 

that does not use tetramethrin.

 Exposure factors used in the CARES assessment were determined based on consultation 

between EPA and the tetramethrin registrants. Many of the non-tetramethrin-specific 

distributional inputs are based on EPA’s n-methyl Carbamate Revised Cumulative Risk 

Assessment (NMCCRA), the most recent EPA publication using probabilistic methods and 

distributional inputs for residential exposure assessment. For more information on the inputs and 

distributions considered for the children’s non-dietary ingestion exposure following use of 0.35% 

tetramethrin aerosol space sprays, refer to the HED Review of “Evaluation of Potential Human 

Health Risks Associated with Residential Uses of Tetramethrin: Revised Supplemental – Shortterm Oral Benchmark Dose Analysis,” dated February 25, 2010. For all other post-application 

scenarios, refer to the Tetramethrin: Phase IV Revised Occupational and Residential Exposure 

Assessment and Recommendations for the Reregistration Eligibility Decision, dated June 13, 

2008, for more information on the inputs and distributions considered for the CARES 

assessment. 
16

Table 5. CARES Residential Post-Application Assessment – Tetramethrin MOEs for Adults (20 - 49 years) 

Exposure Scenario and Route 

Outdoor Treatment Indoor Treatment (Spray) Percentile 

Inhalation Inhalation (Applicator) Inhalation (Postapplication) 

100 1,690 37,336 5,834 

99.9 2,051 47,342 6,726 

99.8 2,117 48,848 7,162 

99.7 2,150 48,848 7,432 

99.6 2,188 48,848 7,510 

99.5 2,215 48,848 7,673 

Table 6. CARES Residential Post-Application Assessment – Tetramethrin MOEs for Children (1 - 2 years) 

Exposure Scenario and Route 

Indoor Treatment Outdoor Treatment Fogger Spray Percentile Pet Care 

Ingestion Inhalation Ingestion Ingestion Inhalation Ingestion 

100 1,808 1,034 3,351 754 3,007 3,725 

99.9 2,123 1,040 5,347 1,131 3,113 5,135 

99.88 2,188 1,042 5,487 1,247 3,130 5,207 

99.8 2,387 1,045 6,085 1,455 3,160 5,770 

99.7 2,603 1,045 6,952 n/a 3,221 6,131 

99.6 2,771 1,046 7,951 n/a 3,246 6,482 

99.5 2,870 1,048 8,475 n/a 3,285 6,719 

n/a- The “Evaluation of Potential Human Health Risks Associated with Residential Uses of Tetramethrin: Revised Supplemental – Short-term

Oral Benchmark Dose Analysis” submitted by the registrant in November 2009 only provided MOEs down to the 99.8 percentile, which were all 

below the Agency’s LOC (MOE >1000). 

As demonstrated in Tables 5 and 6, for the tetramethrin CARES probabilistic residential 

exposure assessment, all MOEs were above 1,000 at the 99.9 percentile for all scenarios assessed 

for both adults and children. 

 

6. Aggregate Exposure and Risk 

 For tetramethrin, short term aggregate risk potentially involves adding exposure estimates 

for incidental oral exposure and inhalation exposure pathways for young children. However, 

exposures from incidental oral and inhalation pathways may not be aggregated for tetramethrin 

because the toxicity endpoints for these exposure routes are not based on common toxic effects 

(i.e., body weight changes are considered to be non-specific, and there are no common specific 

target organ effects observed in the oral and inhalation toxicity studies.) 

7. Occupational Exposure and Risk 

 The occupational risk assessment addresses risks to workers who may be exposed to 

tetramethrin when mixing, loading, or applying a pesticide (i.e., handlers), and when entering 

treated sites for routine tasks (post-application). Exposure for workers generally occurs via the 

dermal or inhalation route. However, for tetramethrin, only inhalation exposures were calculated 

since there were no treatment related systemic toxic effects at the highest dose tested in the 21 

day dermal toxicity study. The target MOE is 1,000 for occupational exposures. 
17

Occupational exposure to tetramethrin was assessed using data from the Pesticide 

Handler Exposure Database (PHED), and worker exposure and risk estimates are based on the 

best data currently available to the Agency. In addition, standard default assumptions pertaining 

to average body weight, work day, and area treated daily were used to calculate risk estimates. 

Application rates used in this assessment are derived directly from current tetramethrin labels. 

The occupational risk assessment is summarized here. For further detail, see the Tetramethrin 

Risk Assessment for Registration Eligibility Decision, dated June 18, 2008, and HED Review of 

Evaluation of Potential Human Health Risks Associated with Residential Uses of Tetramethrin: 

Supplemental Assessment for Indoor Space Spray, dated April 27, 2009. 

 

a. Occupational Handler Exposure and Risks

 

 The term “handler” applies to individuals who mix, load, and apply the pesticide product. 

Because most tetramethrin products are packaged in aerosol cans, most of the uses will involve 

application only (i.e., there is no mixing or loading activities for aerosol cans). However, some 

products are packaged as ready-to-use liquids or liquid concentrates, which are applied with 

mechanical sprayers, compressed air sprayers or foggers (i.e., equipment and formulation that do 

require mixing and loading activities). Based upon the currently registered product labels, the 

Agency assessed the following occupational handler scenarios: 

Pesticide Control Operator Scenarios

 

1. Mix/Load/Apply (M/L/A) liquids with a backpack sprayer or low pressure handwand 

2. M/L/A liquids with handheld fogging equipment 

3. Applying with an aerosol can 

4. Load/Apply (L/A) liquids with a trigger-pump sprayer 

 Occupational handler exposure assessments are conducted by the Agency using different 

levels of protection. The Agency typically evaluates all exposures with minimal protection and 

then adds protective measures in a tiered approach to determine the level of protection necessary 

to obtain appropriate MOEs. Dermal exposures were not assessed because no systemic effects 

were observed at the limit dose in available acceptable dermal toxicity studies. Inhalation 

exposures were assessed at the minimum level of protection, which is no respirator. Risk 

estimates (i.e., MOEs) for the general surface and space sprays and handheld fogger handler 

scenarios are summarized in Tables 7 and 8. All MOEs are above the target MOE of 1,000 

(ranging from 9,000 to 50,000), and therefore, are not of concern. 

Table 7. Short / Intermediate-term Inhalation MOEs for Occupational Handlers Applying General Surface 

and Space Sprays 

Exposure Scenario 

Unit 

ExposureA 

(μg/lb a.i.) 

Application 

RateB

Amount 

Sprayed 

per Day 

lb a.i. 

handled 

per day 

Inhalation 

DoseE 

(mg/kg/day) 

Inhalation 

MOEF

M/L/A liquids with LP 

hand-wand or backpack 

sprayer 

30 40 gallonsC

 0.8 0.00034 10,000 

L/A liquids with Triggerpump Sprayer 123 

0.02 lb 

a.i./gallon 

solution 2 gallonsD 0.04 0.00007 50,000 
18

Table 7. Short / Intermediate-term Inhalation MOEs for Occupational Handlers Applying General Surface 

and Space Sprays 

Exposure Scenario 

Unit 

ExposureA 

(μg/lb a.i.) 

Application 

RateB

Amount 

Sprayed 

per Day 

lb a.i. 

handled 

per day 

Inhalation 

DoseE 

(mg/kg/day) 

Inhalation 

MOEF

Aerosol can application 1300 0.35% a.i. 6 cansD 0.015 0.00039 9,000 

A. Unit Exposure values are from PHED. 

B. Application rates are from labels 769-939 (0.02 lb a.i./gallon solution) and 4822-513 (0.35%) 

C. Based upon ExpoSAC Policy 9. 

D. Screening level estimate based upon professional judgment. 

E. Inhalation dose (mg/kg/day) = [unit exposure (ug/lb a.i.) * 0.001 mg/ g * lb a.i. handled per day)] / Body weight 

(70 kg). 

F. MOE = NOAEL (3.5 mg/kg/day) / Dose 

 

Table 8. Inhalation MOEs for Occupational Handlers Applying Sprays using Handheld Fogging Equipment 

Application Rate 

(lb a.i./ft3)

A (mg/m3

)

B

Inhalation 

ExposureC

(mg/day) 

Inhalation DoseD 

(mg/kg/day) 

Inhalation 

MOEE

0.00000001 0.218 0.0174 0.00025 14,000 

A. Based on EPA Reg. No. 73049-432: 1 fluid ounce of 0.10% RTU solution per 600 square feet at an 

approximate spray height of 8 feet. [1 fl.oz./600 ft2

] * [1 gallon/128 fl.oz.] * [8.35 lb soln/gallon] * [0.1% a.i.] / 

8 ft = 0.00000001 lb a.i./ft3

B. Application rate (mg/m3) = 0.00000001 lb a.i./ft3 * [454000 mg/lb] * [35 ft3/m3] = 0.218 mg/m3

C. Inhalation Exposure (mg/day) = [Application Rate (mg/m3

) * Breathing Rate (1 m3/hr) * Exposure Time (8 

hours/day)] / Outdoor Dilution Factor (100) 

D. Inhalation Dose (mg/kg/day) = Inhalation Exposure (mg/day) / Body Weight (70 kg) 

E. MOE = NOAEL/Dose where the NOAEL is 3.5 mg/kg/day. 

b. Occupational Post-Application Exposure and Risk 

 The Agency uses the term “post-application” to describe exposures to individuals that 

occur as a result of being in an environment that has been previously treated with a pesticide 

(also referred to as re-entry exposure). The Agency did not conduct a post-application risk 

assessment for tetramethrin for occupational exposures. Although dermal exposure is possible 

and expected, no occupational post-application assessment was conducted because no systemic 

effects were observed at the limit dose in available acceptable dermal toxicity studies in animals. 

Additionally, inhalation post-application exposures were not assessed because tetramethrin is 

applied in areas where prolonged occupational presence in areas with low ventilation following 

application (e.g., following greenhouse applications) is not expected. 

8. Cumulative Exposure and Risk 

Section 408(b)(2)(D)(v) of FFDCA requires that, when considering whether to establish, 

modify, or revoke a tolerance, the Agency consider “available information” concerning the 

cumulative effects of a particular pesticide's residues and “other substances that have a common 

mechanism of toxicity.” 

 Tetramethrin is a member of the pyrethroid class of insecticides. This class also includes 

permethrin, cypermethrin, cyfluthrin, fluvalinate, bifenthrin, fenpropathrin, and lambdacyhalothrin, among others. EPA developed a draft science policy document on the proposed 
19

common mechanism of toxicity for naturally-occurring pyrethrins and synthetic pyrethroids 

(Proposed common mechanism grouping for the pyrethrins and pyrethroids, draft, May 19, 2009; 

http://www.regulations.gov/search/Regs/home.html#documentDetail?R=09000064809a62df ). 

This document was supported by the FIFRA Scientific Advisory Panel (SAP) and EPA will 

finalize the policy document on the pyrethroid common mechanism of toxicity taking into 

account the SAP comments. Pesticides with a common mechanism of toxicity are subject to 

cumulative risk assessment under the FQPA. Research is on-going by EPA’s Office of Research 

and Development (ORD) to make improvements to the Stochastic Human Exposure and Dose 

Simulation (SHEDS) probabilistic exposure model which are important for the cumulative risk 

assessment. EPA ORD is also developing physiologically-based pharmacokinetic models for 

several pyrethroids. The status of both of these research modeling efforts will be reviewed by 

the FIFRA SAP in July, 2010. For information regarding EPA’s efforts to evaluate the risk to 

pyrethroids, see http://www.epa.gov/oppsrrd1/reevaluation/pyrethroids-pyrethrins.html.

 9. Tetramethrin Human Incident Reports 

The OPP Incident Data System (IDS) and Poison Control Centers (PCC) databases were 

consulted for poisoning incident data on the active ingredient tetramethrin. Reports submitted to 

the IDS and PCC typically represent anecdotal reports or allegations only; therefore, no 

conclusions can be drawn implicating tetramethrin as a cause of any of the reported health 

effects unless supported by results from other data sources or unless the individual incidents are 

well documented. 

 

There were approximately 98 reported incidents in the IDS database over the five year 

period from 2002 to 2007 (for which the incident report was conducted) for products containing 

tetramethrin. Since there are no pesticide products for which tetramethrin is the sole active 

ingredient, reported incidents cannot be solely attributed to exposure to tetramethrin. The 

incidents are classified as mild to moderate human incidents (less than 1% involved major 

effects). The majority (approximately 85%) of incidents with documented health effects 

reported either no effects or mild effects resulting from tetramethrin-related exposures. The 

majority of the symptoms included respiratory irritation, shortness of breath, blisters, welts, 

hives, dizziness, rashes, coughing, and eye irritation, which are similar to that of other pyrethroid 

compounds. The PCC incidents involved a wide range of effects including cardiovascular, 

gastrointestinal, respiratory, dermal, and ocular effects. 

 

The Agency believes the number of reported incidents is small in relation to the estimated 

usage of tetramethrin, which is approximately 15,000 to 30,000 pounds per year. Tetramethrin 

applications are primarily residential localized or spot treatments via aerosol or RTU sprays on 

an “as needed” basis (residential exposures accounted for 98% of the reported cases involving 

tetramethrin); therefore, given this broad spectrum residential use pattern, the Agency estimates 

the number of applications per year could range in the hundreds of thousands or greater. 

 

In conclusion, the incident report does not garner greater concern for the active ingredient 

tetramethrin solely. Furthermore, in a recent review of the pyrethroid class of chemicals and 

aggravated dermal and asthmatic reactions, titled “A Review of the Relationship between 

Pyrethrins, Pyrethroid Exposure and Asthma and Allergies,” dated September 18, 2009, the 
20

Agency concluded, based on the weight of the evidence, there is not a clear relationship between 

pyrethrins/pyrethroid exposure and asthma and allergies. Therefore, the Agency is not requiring 

additional warnings or label statements specific to asthmatics on pyrethroids and pyrethrins enduse product labels at this time. For more information on this review, please refer to 

http://www.epa.gov/oppsrrd1/reevaluation/pyrethrins-pyrethroids-asthma-allergy-9-18-09.pdf. 

 

B. Environmental Risk Assessment

Tetramethrin is used in residential and industrial/commercial areas in relatively small 

quantities through aerosols, foggers, and space sprays. On a nationwide basis, tetramethrin use is 

relatively limited. It is not used on a wide scale, such as agriculture or in mosquito abatement by 

public authorities. The use pattern is, therefore, in individual, isolated areas, and again, in small 

amounts. Tetramethrin also decomposes rapidly by photolysis and hydrolysis. The localized use 

pattern of tetramethrin, combined with the low total pounds used on a national basis, and rapid 

degradation due to photolysis and hydrolysis, make it highly unlikely that non-target organisms 

will be exposed at harmful levels. Non-target organism exposure is most likely to result from 

outdoor uses, such as spraying wasp or hornet nests under the eaves of houses, and backyard 

foggers for flying insects. Further, because of the very rapid photolytic decomposition of 

tetramethrin, only those organisms present at the time of spraying are likely to be exposed and 

are at risk of acute effects. 

The standard models (GENEEC, PRZM-EXAMS, T-REX, Terrplant) used to calculate 

and quantify risks to terrestrial and aquatic organisms do not fit with the localized use patterns of 

tetramethrin. As a result, tetramethrin’s ecological risk assessment did not follow the standard 

methodology and the acute risks will be characterized qualitatively rather than quantitatively. A 

summary of the Agency’s environmental fate and effects risk assessment is presented below. 

For detailed discussion of all aspects of the environmental risk assessment, please see the 

February 5, 2008 Revised Environmental Fate and Ecological Risk Assessment Chapter in 

Support of Phase I of the Re-registration Eligibility Decision on Tetramethrin, which is available 

under docket number EPA-HQ-OPP-2008-0014. 

1. Environmental Fate and Transport 

 Tetramethrin is not a persistent pyrethroid in the environment. It may be co-formulated 

with synergists, other active ingredients such as pyrethrins and pyrethroids, and growth 

inhibitors. These other ingredients are more persistent than tetramethrin and provide residual 

activity against insects not initially exposed. Tetramethrin decomposes rapidly by photolysis and 

hydrolysis in shallow, non-turbid water. Photolysis in air is expected to be rapid (half-life 30 

minutes) based on reaction with ozone. Tetramethrin is more susceptible to hydrolysis at pH 7 

and 9 than pH 5. The half-lives were 15.9 – 19.7 days (pH 5), 0.89 – 1.06 days (pH 7), and 

0.009 – 0.014 days (pH 9). Tetramethrin is slightly mobile in soil (Koc value range from 1,249-

2,939), has a vapor pressure of 7.1x10-6 mm Hg, water solubility of 1.83 mg/L, and an estimated 

Henry’s law constant of 1.7x10-6 atm-m3/mol-1. 

 At least nine degradates were detected in a column leaching study, and in an aerobic soil 

metabolism study, seven degradates were identified including one (acid-NPY) that retains the 
21

entire ester structure and possibly the mode of action of the parent tetramethrin. However, it too 

is subject to rapid hydrolysis, and therefore, exposure to acid-NPY is unlikely. In two acceptable 

field dissipation studies, tetramethrin dissipated from the upper 15 cm of soil with a DT50 (time 

to 50% degradation) of 3 hours in a California study, and less than one hour in a Florida study. 

No toxicity data are available for tetramethrin degradates. 

 Indoor uses of tetramethrin are not expected to result in significant exposure pathways to 

terrestrial and aquatic ecosystem as they are confined indoors, and tetramethrin rapidly degrades 

in hours. While there are numerous outdoor uses, these applications are limited to spot 

treatments in localized areas and, again, the degradation of tetramethrin to non-toxic degradates 

is rapid. There is potential for tetramethrin residues to be transported to aquatic systems from 

use in drainage systems, but only in acidic water where hydrolysis is slower. However, the 

Agency believes exposure is unlikely because product labels prohibit direct application to water. 

2. Ecological Exposure and Risk 

The possible exposure mechanisms considered following tetramethrin applications were 

runoff, spray drift, and direct spray. Only direct spray is considered to be a completed exposure 

pathway, since tetramethrin is too non-persistent to be transported via runoff, and it is not used in 

sufficient quantities for spray drift to be of concern. As stated above, neither indoor nor outdoor 

uses of tetramethrin are expected to result in significant exposure pathways to terrestrial and 

aquatic ecosystems since they are limited and tetramethrin degrades rapidly. Given that 

degradation of tetramethrin to non-toxic degradates is rapid, the primary risk will be acute 

exposure to tetramethrin at the time of application and a brief period thereafter. 

Acute toxicity data from studies submitted by pesticide registrants along with the 

available open literature were used to evaluate the potential direct effects of tetramethrin aquatic 

and terrestrial organisms. This includes toxicity data on the technical grade active ingredient, 

degradates, and formulated products when available. The open literature studies are indentified 

through EPA’s ECOTOX database (https://cfpub.epa.gov/ecotox/), which employs a literature 

search engine for locating chemical toxicity data for aquatic life, terrestrial plants, and wildlife. 

The evaluation of both sources of data can also provide insight into the direct and indirect effects 

of tetramethrin on biotic communities from loss of species that are sensitive to the chemical and 

from changes in structure and functional characteristics of affected communities. 

a. Terrestrial Organisms 

No terrestrial modeling was conducted for tetramethrin because exposure of non-target 

organisms to harmful levels is unlikely based on the localized use patterns, low total pounds used 

on a national basis, and rapid degradation due to photolysis and hydrolysis. Instead, the Agency 

conducted a qualitative assessment using submitted studies and review of the literature. 

 

 The Agency developed an effects characterization, which describes the potential effects a 

pesticide can produce in a terrestrial organism, and is based on registrant-submitted studies that 

describe acute effects toxicity information for various terrestrial animals. Table 9 summarizes 
22

the specific measurement endpoint value selected to evaluate risks for tetramethrin to mammals 

and birds. 

Table 9. Summary of Specific Measurement Endpoint Values Selected to Evaluate Risk for the Associated 

Terrestrial Animal Assessment Endpoints 

Selected Measurement Endpoint Values and Source 

Assessment 

Ends 

Acute 

Measurement 

Endpoint 

(most 

sensitive) 

Species Study 

Duration 

Toxicity 

Value 

Most Sensitive 

Endpoint 

(MRID) 

Acute 

Toxicity 

Classification 

Acute oral 

toxicity 

Bobwhite 

quail 

Single oral 

dose 

LD50 >2250 

mg/kg-bw 

Mortality* 

(416096-04/ 

Acceptable) Survival and 

Reproduction 

of Birds, 

Reptiles and 

Amphibians 

Acute dietary 

toxicity 

Bobwhite 

quail and 

Mallard 

duck 

8 days LC50 >5620 

mg/kg/-diet 

Mortality* 

(416096-05, 

416096-06/ 

Acceptable) 

Practically 

non-toxic 

Acute oral 

toxicity, LD50

Rat Single oral 

dose 

LD50 >5000 

mg/kg-bw 

Mortality* 

(00063574/ 

Acceptable) 

Dermal 

toxicity, LD50

Rat Not 

available 

LD50 >5000 

mg/kg-bw 

Mortality* 

(00063574/ 

Acceptable) 

Inhalation 

toxicity, LC50

Rat Not 

available 

LC50 >1.18 

mg/L 

Mortality* 

(421464-01/ 

Acceptable) 

Survival and 

Reproduction 

of Terrestrial 

Mammals 

Reproduction 

NOAEL 

Rat Two – 

generation 

25 

mg/kg/day 

Mortality* 

(161842/ 

Acceptable) 

Practically 

non-toxic 

Contact LD50

(μg/bee) 

Honey bee 

(Apis 

mellifera) 

48 hours LD50 0.155 

μg/bee 

Mortality 

(416096-13/ 

Acceptable) 

Survival of 

Terrestrial 

Invertebrates 

and Beneficial 

Insects 

Foliar residue 

toxicity (honey 

bee) 

Honey bee 

(Apis 

mellifera) 

24 hours 

post 

treatment 

< 3 hours 

post 

treatment 

Mortality 

(419408-01/ 

Acceptable) 

Highly Toxic 

*None observed at the highest dose 

Birds and Mammals

Non-target terrestrial animals are not likely to be subject to mortality from the use of 

tetramethrin because it is practically non-toxic to birds and mammals on an acute exposure basis. 

The limitation of outdoor applications to spot treatments and the non-persistent nature of 

tetramethrin make it unlikely that exposure sufficient to cause the chronic effects seen in 

laboratory studies would occur in the field. The Agency's conceptual model for assessing risk to 

terrestrial animals assumes that the animals derive the entirety of their diet from treated feed 

items. The use of tetramethrin as a spot treatment in residential and/or commercial settings is 

unlikely to result in extensive treatment of potential feed items. In addition, although chronic 

toxicity studies are not designed to determine how long an exposure is necessary to cause 

adverse chronic effects, the quick degradation of tetramethrin would reduce the amount of time 

that toxic residues are available for potential dietary exposure. 
23

Given that tetramethrin is an insecticide, it is considered highly toxic to invertebrates, 

including beneficial insects, such as honey bees, on an acute contact exposure basis. Non-target 

invertebrates present at the time of spraying and shortly thereafter are considered to be at risk of 

acute effects. 

Terrestrial Plants

 Toxicity data are not available for terrestrial plants. Therefore, the potential for risk to 

terrestrial plants from exposure to tetramethrin cannot be assessed, and remains an uncertainty. 

The Agency believes there is a low likelihood of exposure to non-target terrestrial plants because 

outdoor applications are limited to spot treatments, and therefore, is not requiring additional 

toxicity data at this time. The Agency, however, may reevaluate the need for this data during 

registration review, which is scheduled to being in 2012. 

b. Aquatic Organisms 

No aquatic exposure modeling was conducted for tetramethrin because exposure of nontarget organisms to harmful levels is unlikely based on the localized use patterns, low total 

pounds used on a national basis, and rapid degradation due to photolysis and hydrolysis. Also, 

the aquatic exposure models assume that the chemical is applied to a ten-acre watershed draining 

to a one-acre pond, which is unlikely for current use scenarios for tetramethrin. Instead, the 

Agency conducted a qualitative assessment using submitted studies and review of the literature. 

 

 The Agency developed an effects characterization, which describes the potential effects a 

pesticide can produce in an aquatic organism, and is based on registrant-submitted studies that 

describe acute effects for various aquatic animals. Table 10 summarizes the toxic effects and 

reference values used to assess risks for tetramethrin to aquatic organisms. 

Table 10. Summary of Specific Measurement Endpoint Values Selected to Evaluate Risk for the Associated 

Terrestrial Animal Assessment Endpoints 

Selected Measurement Endpoint Values and Source 

Assessment 

Ends 

Acute 

Measurement 

Endpoint 

(most 

sensitive) 

Species Study 

Duration 

Toxicity 

Value 

Most Sensitive 

Endpoint 

(MRID) 

Acute 

Toxicity 

Classification 

Survival and 

Reproduction 

of Freshwater 

Vertebrates 

(fishes, etc.) 

Freshwater 

fish or 

amphibian 

LC50

Rainbow 

trout 

(Oncorhyn

chus 

mykiss) 

96 hr LC50 3.7 ppb Mortality 

(416096-08/ 

Acceptable) Very Highly 

Toxic 

Survival and 

Reproduction 

of Freshwater 

Invertebrates 

Freshwater 

invertebrates 

Water flea 

(Daphnia 

magna) 

48 hr EC50 

flowthrough 

45 ppb Immobilization and 

mortality 

(416096-09/ 

Supplemental) 

Very Highly 

Toxic 

 

Freshwater and Estuarine/Marine Fish and Invertebrates 

The acute toxicity of tetramethrin was tested in two species of freshwater fish (rainbow 

trout and bluegill sunfish) and one freshwater invertebrate. Based on submitted studies, 
24

tetramethrin is classified as very highly toxic to fish and invertebrates on an acute exposure 

basis. No chronic toxicity data were available for freshwater fish or invertebrates. However, 

the limitation of outdoor applications to spot treatments and the non-persistent nature of 

tetramethrin make it unlikely that exposure sufficient to cause the chronic effects would occur. 

The use of tetramethrin as a spot treatment in residential and/or commercial settings is unlikely 

to result in spray drift or run-off activities that would lead to exposure to non-target aquatic 

organisms. In addition, although chronic toxicity studies are not designed to determine how 

long an exposure is necessary to cause adverse chronic effects, the quick degradation of 

tetramethrin would reduce the amount of time that toxic residues are available for potential 

dietary exposure. 

Additionally, no acute or chronic toxicity data were available for estuarine/marine fish or 

invertebrates. The Agency is not requesting this toxicity data for estuarine/marine fish or 

invertebrates because the outdoor uses of tetramethrin should not pose an acute risk to aquatic 

animals (fish, aquatic-phase amphibians, and invertebrates) since exposure levels are not 

expected to reach thresholds where adverse effects would be likely for such uses. Additionally, 

based on the rapid photolytic and hydrolytic degradation of tetramethrin, and its demonstrated 

rapid dissipation in field studies, the exposure duration is not expected to be sufficient to cause 

reproductive effects. There are potential acute risks to non-target aquatic organisms from direct 

application to drainage systems, but only in acidic waters where hydrolysis is slower. This 

remains an uncertainly in the risk assessment; however, the Agency believes exposure is unlikely 

because product labels prohibit direct application to water. 

Aquatic Plants

 Toxicity data are lacking for vascular and nonvascular aquatic plants. However, 

tetramethrin is not expected to reach water bodies in sufficient concentrations to induce 

phytotoxic effects in aquatic plants. Runoff exposure is not expected due to very short 

photolysis, hydrolysis, and field dissipation half-lives. Spray drift exposure is expected to be 

minimal based on use patterns and label restrictions. Therefore, the Agency is not requiring 

additional toxicity data at this time. The Agency, however, may reevaluate the need for this data 

during registration review, which is scheduled to being in 2012. 

c. Data Gaps 

As stated above, the Agency does not have chronic toxicity data for either terrestrial or 

aquatic organisms, acute or chronic toxicity data for terrestrial or aquatic plants, nor acute 

toxicity data for are estuarine/marine animals. Although these data are guideline requirements, 

the available effects data, non-persistent nature of tetramethrin, and low potential for 

environmental exposure indicate this data would not affect the outcome of the risk assessment. 

No additional environmental fate studies are needed to complete this assessment. 

3. Adverse Ecological Incidents 

 A search of the EIIS (Environmental Incident Information System) database for 

ecological incidents (run on Dec. 2, 2005) identified no ecological incidents involving 
25

tetramethrin. The number of documented incidents in EIIS is believed to be a very small fraction 

of total mortality caused by pesticides for a variety of reasons. An absence of reports does not 

necessarily equate to an absence of incidents given the nature of the incident reporting. 

4. Endangered Species Considerations

 Table 11 provides a matrix that depicts the potential for direct and indirect effects to 

listed species resulting from the use of tetramethrin. No direct or indirect effects to endangered 

species are expected, except the potential for direct effects for Listed insects or indirect effects to 

plants if they have an obligate relationship with a Listed insect pollinator. 

Table 11. Listed Species Associated With Direct or Indirect Effects Due to Applications of Tetramethrin for 

all Outdoor Uses 

Listed Taxon Direct Effects Indirect Effects 

Terrestrial and semi-aquatic plants – monocots None (1) Possible (2) 

Terrestrial and semi-aquatic plants - dicots None (1) Possible (2) 

Insects Yes (acute) None 

Birds None (3) None (4) 

Terrestrial phase amphibians None (3) None (4) 

Reptiles None (3) None (4) 

Mammals None (5) None (4) 

Aquatic vascular plants None (1) None 

Freshwater fish None (6) None (4) 

Aquatic phase amphibians None (6) None (4) 

Freshwater crustaceans None (6) None (4) 

Mollusks None (6) None (4) 

Marine/estuarine fish None (6) None (4) 

Marine/estuarine crustaceans None (6) None (4) 

(1) Direct effects to plants are not anticipated based on lack of incident reports, registration on ornamental plants, 

and no identified mechanism of toxicity. 

(2) Indirect Effects on plants are possible if they have an obligate relationship with a Listed insect pollinator. 

(3) Direct Effects are considered unlikely due to low toxicity to birds and low exposure. 

(4) Indirect effects via loss of prey base (insects and invertebrates) not likely due to low magnitude of effect. 

(5) Direct effects are considered unlikely due to low toxicity to mammals and low exposure. 

(6) Direct Effects are not anticipated due to low exposure, despite high toxicity to freshwater fish and invertebrates.

 Specific levels of concern could not be evaluated for the supported use of tetramethrin 

because risk quotients (RQs) were not calculated in this assessment. However, acute risks from 

tetramethrin’s outdoor uses to listed aquatic species are not expected due to low application 

rates, the localized and spatially fragmented use patterns, and rapid dissipation of the chemical 

stressor due to photolysis and hydrolysis. 
26

In terrestrial environments, vertebrates such as mammals, birds, reptiles and amphibians 

are not expected to be at risk because tetramethrin is practically non-toxic to birds and mammals, 

and because of the localized and fragmented use patterns. Insects, if directly exposed, are at risk 

of mortality. 

The potential for chronic risk to any listed animal cannot be dismissed at this time 

because of a lack of available data. However, tetramethrin is not expected to persist long enough 

to lead to chronic exposure. 
27

IV. Risk Management, Reregistration, and Tolerance Reassessment Decision 

A. Determination of Reregistration Eligibility 

 Section 4(g)(2)(A) of FIFRA calls for the Agency to determine, after submission of 

relevant data concerning an active ingredient, whether or not products containing the active 

ingredient are eligible for reregistration. The Agency has previously identified and required the 

submission of the generic (i.e., active ingredient-specific) data required to support reregistration 

of products containing the active ingredient tetramethrin. The Agency has completed its review 

of these generic data, and has determined that the data are sufficient to support reregistration of 

all products containing tetramethrin. 

 The Agency has completed its assessment of the human health and ecological risks 

associated with the use of pesticide products containing the tetramethrin. The Agency has 

determined that tetramethrin-containing products are eligible for reregistration provided that 

label amendments are made as outlined in Chapter V. Appendix A summarizes the uses of the 

tetramethrin that are eligible for reregistration. Appendix B identifies the generic data 

requirements that the Agency reviewed as part of its determination of reregistration eligibility of 

tetramethrin, and lists the submitted studies that the Agency found acceptable. 

 Based on its evaluation of tetramethrin, the Agency has determined that products 

containing tetramethrin, unless labeled and used as specified in this document, would present 

risks inconsistent with FIFRA. Accordingly, should a registrant fail to implement any of the 

label changes identified in this document, the Agency may take regulatory action to address the 

risk concerns from the use of tetramethrin. If all changes outlined in this document are 

incorporated into the product labels, then all current risks for tetramethrin will be adequately 

mitigated for the purposes of this determination under FIFRA. 

 

B. Public Participation

 Through the Agency’s public participation process, EPA worked with stakeholders and 

the public to reach the regulatory decisions for tetramethrin. EPA released the tetramethrin 

preliminary risk assessments for public comment on February 27, 2008, for a 60-day public comment 

period (Phase 3 of the public participation process). During the public comment period on the risk 

assessments, which closed on April 28, 2008, the Agency received comments from: the 

registrant McLaughlin, Gormley, King Company; the California Regional Water Quality Control 

Board, S.F. Bay Region; the California Stormwater Quality Association (CASQA); California 

Tri-TAC; as well as from private citizens. These comments in their entirety, responses to the 

comments, as well as the preliminary and revised risk assessments, are available in the public 

docket (OPP-2008-0014) at http:www.regulations.gov. 

C. Regulatory Position

1. Regulatory Rationale

 
28

 The Agency has determined that products containing tetramethrin are eligible for 

reregistration provided that specified label amendments are made. The following is a summary 

of the rationale for managing risks associated with the use of tetramethrin. Where labelling 

revisions are warranted, specific language is set forth in the summary table of Section V. 

Maximum application rates eligible for reregistration are set forth in Appendix A. 

 a. Human Health Risk Management 

 

There are no human health risks of concern for tetramethrin, and therefore, no risk 

mitigation is necessary. The personal protective equipment (PPE) for all occupational handlers 

is baseline (long-sleeve shirt, long pants, and shoes plus socks), and the re-entry interval (REI) is 

12 hours. 

 b. Ecological Risk Management 

 The Agency evaluated potential ecological risk from both indoor and outdoor uses of 

tetramethrin. However, although the Agency believes exposure to non-target organisms is 

unlikely, tetramethrin is considered highly toxic to aquatic organisms. Therefore, the Agency is 

requiring the following label statements to reduce the potential exposure of tetramethrin to 

aquatic organisms as stipulated in the Label Table, Table 12. Because outdoor uses will be 

limited to localized spot treatments, no additional mitigation measures, beyond those specified 

below, are required. 

• Incorporation of PR Notice 2008-1, “Environmental Hazard General Labeling Statements 

on Outdoor Residential Use Products” on appropriate outdoor non-agricultural end-use 

products. 

• Products labeled for General Outdoor Surface and Space Sprays (except outdoor fogging 

devices): 

“All outdoor applications must be limited to spot or crack-and-crevice treatments only, 

except for the following permitted uses: 

 Treatment to soil or vegetation around structures; 

 Applications to building foundations up to a maximum height of 3 feet. 

Other than applications to building foundations, all outdoor applications to impervious 

surfaces such as sidewalks, driveways, patios, porches and structural surfaces (such as 

windows, doors, and eaves) are limited to spot treatments or crack-and-crevice 

applications, only.” 

• Products labeled for use around or near floor drains must contain the following statement: 

 “Application is prohibited directly into sewers or drains, or to any area like a gutter 

where drainage to sewers, storm drains, water bodies, or aquatic habitat can occur. Do 

not allow the product to enter any drain during or after application.” 

• Products labeled for use in drains or sewers must contain the following statement: 
29

“Do not apply directly to sewers or drains, or to any area like a gutter where drainage to 

sewers, storm drains, water bodies, or aquatic habitat can occur, except as directed by this 

label.” 

2. Endocrine Disruptor Screening Program 

As required under FFDCA section 408(p), EPA has developed the Endocrine Disruptor 

Screening Program (EDSP) to determine whether certain substances (including pesticide active 

and other ingredients) may have an effect in humans or wildlife similar to an effect produced by 

a “naturally occurring estrogen, or other such endocrine effects as the Administrator may 

designate.” The EDSP employs a two-tiered approach to making the statutorily required 

determinations. Tier 1 consists of a battery of 11 screening assays to identify the potential of a 

chemical substance to interact with the estrogen, androgen, or thyroid (E, A, or T) hormonal 

systems. Chemicals that go through Tier 1 screening and are found to have the potential to 

interact with E, A, or T hormonal systems will proceed to the next stage of the EDSP where EPA 

will determine which, if any, of the Tier 2 tests are necessary based on the available data. Tier 2 

testing is designed to identify any adverse endocrine related effects caused by the substance, and 

establish a quantitative relationship between the dose and the E, A, or T effect. 

Between October 2009 and February 2010, EPA issued test orders/data call-ins for the 

first group of 67 chemicals, which contains 58 pesticide active ingredients and 9 inert 

ingredients. This list of chemicals was selected based on the potential for human exposure 

through pathways such as food and water, residential activity, and certain post-application 

agricultural scenarios. This list should not be construed as a list of known or likely endocrine 

disruptors. 

 Tetramethrin is not among the group of 58 pesticide active ingredients on the initial list to 

be screened under the EDSP. Under FFDCA sec. 408(p) the Agency must screen all pesticide 

chemicals. Accordingly, EPA anticipates issuing future EDSP orders/data call-ins for all 

registration review cases, including those for which EPA has already opened a registration 

review docket for a pesticide active ingredient. The tetramethrin registration review docket is 

currently scheduled to open in 2012. 

For further information on the status of the EDSP, the policies and procedures, the list of 

67 chemicals, the test guidelines and the Tier 1 screening battery, please visit our website: 

http://www.epa.gov/endo/. 

3. Endangered Species 

 The Endangered Species Act required federal agencies to ensure that their actions are not 

likely to jeopardize listed species or adversely modify designated critical habitat. The Agency 

has developed the Endangered Species Protection Program to identify pesticides whose use may 

cause adverse impacts on federally listed endangered and threatened species, and to implement 

mitigation measures that address these impacts. To assess the potential of registered pesticide 

uses that may affect any particular species, EPA puts basic toxicity and exposure data developed 
30

for the REDs into context for individual listed species and considers ecological parameters, 

pesticide use information, the geographic relationship between specific pesticide uses and 

species locations and biological requirements and behavioral aspects of the particular species. 

When conducted, these analyses take into consideration any regulatory changes recommended in 

this RED being implemented at that time. A determination that there is a likelihood of potential 

effects to a listed species may result in limitations on the use of the pesticide, other measures to 

mitigate any potential effects, and/or consultations with the Fish and Wildlife Service or National 

Marine Fisheries Service, as necessary. If the Agency determines use of tetramethrin “may 

affect” listed species or their designated critical habitat, EPA will employ the provisions in the 

Services regulations (50 CFR Part 402). 

 No direct or indirect effects to endangered species are expected due to tetramethrin 

applications, except the potential for direct effects for Listed insects or indirect effects to plants if 

they have an obligate relationship with a Listed insect pollinator. The ecological assessment that 

EPA conducted for this RED does not, in itself, constitute a determination as to whether specific 

species or critical habitat may be harmed by the pesticide. Rather, this assessment serves as a 

screen to determine the need for any species specific assessment that will evaluate whether 

exposure may be at levels that could cause harm to specific listed species and their critical 

habitat. That assessment refines the screening-level assessment to take into account the 

geographic area of pesticide use in relation to the listed species, the habits and habitat 

requirements of the listed species, etc. If the Agency’s specific assessments for tetramethrin 

result in the need to modify use of the pesticide, any geographically specific changes to the 

pesticide’s registration will be implemented through the process described in the Agency’s 

Federal Register Notice (54 FR 27984) regarding implementation of the Endangered Species 

Protection Program. 

 

D. Labeling Requirements 

 In order to be eligible for reregistration, various use and safety information will be 

included in the labeling of all end-use products containing tetramethrin. For the specific labeling 

statements, refer to Section V of this RED document. 
31

V. What Registrants Need to Do

 The Agency has determined that products containing tetramethrin are eligible for 

reregistration provided that the required label amendments are made. The Agency intends to 

issue Data Call-In Notices (DCIs) requiring product-specific data. Generally, registrants will 

have 90 days from receipt of a DCI to complete and submit response forms or request time 

extension and/or waiver requests with a full written justification. For product-specific data, the 

registrant will have eight months to submit data. Additionally, below are the label amendments 

that the Agency intends to require for tetramethrin to be eligible for reregistration. 

A. Manufacturing Use Products 

1. Additional Generic Data Requirements 

The generic data base supporting the reregistration of tetramethrin for currently registered 

uses has been reviewed and determined to be substantially complete. However, a few data gaps 

remain, and these are listed below. 

Product Chemistry

All product chemistry data requirements will be required for the technical grade active ingredient 

(see Appendix B). 

Toxicology

830.7050 UV / Visible Absorption 

870.1300 Acute Inhalation 

870.2500 Acute Dermal Irritation 

870.2600 Skin Sensitization 

870.3700a Developmental Toxicity (rodent) 

870.6200a Acute Neurotoxicity 

870.6200b Subchronic Neurotoxicity study 

870.6300 Developmental Neurotoxicity study2

 

870.7800 Immunotoxicity 

2. Labeling for Manufacturing-Use Products 

 2

 Based on the Agency’s review of existing pyrethroid data, EPA has come to the conclusion that the DNT is 

not a particularly sensitive study for comparing the sensitivity of young and adult animals to pyrethroids. EPA 

has recently determined that, as an alternative to the generation and submission of a new DNT study, pyrethroid 

registrants may instead choose to cite the six previously submitted DNT studies for pyrethroid pesticides. The 

Agency is also investigating the need for additional experimentation, specific to the mode of action and 

pharmacokinetic characteristics of pyrethroids, to evaluate the potential for increased susceptibility of young 

organisms. These conclusions and determinations were communicated to registrants of some pyrethroid active 

ingredients in a letter from EPA dated September 4, 2009 (available from the public docket EPA-HQ-OPP2008-0331-0027). Further details are also available from the website 

http://www.epa.gov/oppsrrd1/reevaluation/pyrethroids-pyrethrins.html. 

 
32

 To ensure compliance with FIFRA, manufacturing-use product (MUP) labeling should be 

revised to comply with all current EPA regulations, PR Notices, and applicable policies. The 

MUP labeling should bear the label statements contained in Table 12. 

B. End-Use Products 

1. Additional Product-Specific Data Requirements 

 Section 4(g)(2)(B) of FIFRA calls for the Agency to obtain any needed product-specific 

data regarding the pesticide after a determination of eligibility has been made. The registrant 

must review previous data submissions to ensure that they meet current EPA acceptance criteria, 

and if not, commit to conduct new studies. If a registrant believes that previously submitted data 

meet current testing standards, then the study MRID numbers should be cited according to the 

instructions in the Requirement Status and Registrant’s Response Form provided for each 

product. The Agency intends to issue a separate product-specific data call-in (PDCI), outlining 

specific data requirements. For any questions regarding the PDCI, please contact Karen Jones at 

(703) 308-8047. 

 In addition to the standard product-specific data requirements, efficacy data for all 

applications that target public health pests must be submitted. Additional information on the 

efficacy data can be found in the Series 810 Product Performance Test Guidelines on the 

Agency’s website (http://www.epa.gov/opptsfrs/publications/OPPTS_Harmonized/

810_Product_Performance_Test_Guidelines/index. html). 

Efficacy Data

810.3000 General considerations for efficacy of invertebrate control agents 

810.3100 Soil treatments for imported fire ants 

810.3200 Livestock, poultry, fur- and woo-bearing animal treatment 

810.3300 Treatments to control pests of humans and pets 

810.3400 Mosquito, black fly, and biting midge (sand fly) treatments 

810.3500 Premises treatments 

SS Special study for arthropods 

 The Agency is also requiring a companion animal study (870.7200) for tetramethrin 

products used on domestic animals. The study is to ensure that pesticide formulations for the 

treatment of external pests on domestic animals have an adequate margin of safety for the treated 

companion animal. In addition, data from companion animal safety studies also serve as a basis 

for product labeling. 

870.7200 Companion animal study 

2. Labeling for End-Use Products 

 To be eligible for reregistration, labeling changes are necessary to implement measures 

outlined in Section IV above. Specific language to incorporate these changes is specified in 

Table 12. Generally, conditions for the distribution and sale of products bearing old 
33

labels/labeling will be established when the label changes are approved. However, specific 

existing stocks time frames will be established case-by-case, depending on the number of 

products involved, the number of label changes, and other factors. 
C. Labeling Changes Summary Table 

 In order to be eligible for reregistration, amend all product labels to comply with the following table. Tab

language on the labels should be amended. 

Table 12. Summary of Labeling Changes for Tetramethrin 

Description Amended Labeling Language Plac

Manufacturing Use Products 

Maximum application rates eligible for reregistration are set forth in Appendix A. For Manufacturing Use Products that will be formulated into total release fogger end-use products that contain directions for use indoors 

If information is available that justifies a duration longer than 2 hours 

for the waiting period before beginning ventilation following an application or a duration longer than 2 hours as the length of the ventilation period, submit that information to the Agency. 

Directions fo

For all Manufacturing Use Products “Only for formulation into an insecticide for the following use(s) [fill 

blank only with those uses that are being supported by MP registrant].”

Directions fo

One of these statements may be added to a label to allow reformulation of the product for a specific use or all additional uses supported by a formulator or user group 

“This product may be used to formulate products for specific use(s) not listed on the MP label if the formulator, user group, or grower has complied with U.S. EPA submission requirements regarding support of such use(s).” “This product may be used to formulate products for any additional use(s) not listed on the MP label if the formulator, user group, or grower has complied with U.S. EPA submission requirements regarding support of such use(s).” 

Directions fo

Environmental Hazards Statements “ENVIRONMENTAL HAZARDS” 

“This pesticide is highly toxic to aquatic organisms, including fish and aquatic invertebrates. Do not discharge effluent containing this product into lakes, streams, ponds, estuaries, oceans, or other waters unless in accordance with the requirements of a National Pollutant Discharge 

Eliminations System (NPDES) permit and the permitting authority has been notified in writing prior to discharge. Do not discharge effluent containing this product to sewer systems without previously notifying the local sewage treatment plant authority. For guidance, contact your State 

PrecautionarEnvironment
Table 12. Summary of Labeling Changes for Tetramethrin 

Description Amended Labeling Language Plac

Water Board or Regional Office of the Environmental Protection Agency.” 

End-Use Products Intended for Occupational Use (WPS and Non-WPS) 

Maximum application rates eligible for reregistration are set forth in Appendix A. PPE Requirements for Ready To Use (RTU) Formulations (RTU Liquids and Pressurized Liquids) 

“Personal Protective Equipment (PPE)” “Some materials that are chemical-resistant to this product are [registrant 

inserts correct material(s)].” For more options, follow the instructions for category [insert A, B, C, D, E, F, G or H] on the chemical-resistance 

category selection chart. “Applicators and other handlers must wear: > Long-sleeve shirt and long pants, and > Shoes plus socks.” 

Immediately Precautionarto Humans a

PPE Requirements for Liquid Concentrates including Emulsifiable Concentrates 

“Personal Protective Equipment (PPE)” “Some materials that are chemical-resistant to this product are [registrant 

inserts correct material(s)].” For more options, follow the instructions for category [insert A, B, C, D, E, F, G or H] on the chemical-resistance 

category selection chart. “Mixers, Loaders, Applicators and other handlers must wear: > Long-sleeve shirt and long pants, and > Shoes plus socks.” 

Immediately Precautionarto Humans a

User Safety Requirements “Follow manufacturer’s instructions for cleaning/maintaining PPE. If no 

such instructions for washables exist, use detergent and hot water. Keep and wash PPE separately from other laundry.”

Precautionarto Humans aimmediately requirements 

User Safety Recommendations “User Safety Recommendations” 

“Users should wash hands before eating, drinking, chewing gum, using tobacco, or using the toilet.” “Users should remove clothing/ PPE immediately if pesticide gets inside, 

PrecautionarHazards to HAnimals (Must be pla
Table 12. Summary of Labeling Changes for Tetramethrin 

Description Amended Labeling Language Plac

then wash thoroughly and put on clean clothing.” “Users should remove PPE immediately after handling this product. Wash the outside of gloves before removing. As soon as possible, wash thoroughly and change into clean clothing.” 

Environmental Hazards Statements for Outdoor Aerosols and Foggers AND Outdoor Products Registered Only for 

Commercial Use Sites (eg. golfcourses). 

“ENVIRONMENTAL HAZARDS” “This pesticide is extremely toxic to aquatic organisms, including fish and aquatic invertebrates. Do not apply directly to water, or to areas where surface water is present, or to inter-tidal areas below the mean high water mark. Do not contaminate water when cleaning equipment or disposing of equipment washwater or rinsate.” “This product is highly toxic to bees exposed to direct treatment on blooming crops or weeds. Do not apply this product or allow it to drift to 

blooming crops or weeds while bees are actively visiting the area.” 

PrecautionarHumans and 

Environmental Hazard Statements on Liquid Concentrate consumer outdoor products (e.g., liquids mixed with water by the user for a tank sprayer or hoseend attachment) 

“This pesticide is extremely toxic to aquatic organisms, including fish and invertebrates. To protect the environment, do not allow pesticide to enter or run off into storm drains, drainage ditches, gutters or surface waters. Applying this product in calm weather when rain is not predicted for the next 24 hours will help to ensure that wind or rain does not blow or wash pesticide off the treatment area. Rinsing application equipment over the treated area will help avoid run off to water bodies or drainage systems. This pesticide is highly toxic to bees exposed to direct treatment on blooming crops or weeds. Do not apply this product or allow it to drift to blooming crops or weeds while bees are actively visiting the treatment area.” 

Environment

Environmental Hazard Statements on Liquid Ready-to-Use (except aerosols and foggers) consumer outdoor 

products 

“This pesticide is extremely toxic to aquatic organisms, including fish and invertebrates. To protect the environment, do not allow pesticide to enter or run off into storm drains, drainage ditches, gutters or surface waters. Applying this 

Environment
Table 12. Summary of Labeling Changes for Tetramethrin 

Description Amended Labeling Language Plac

product in calm weather when rain is not predicted for the next 24 hours will help to ensure that wind or rain does not blow or wash pesticide off the treatment area. This pesticide is highly toxic to bees exposed to direct treatment on blooming crops or weeds. Do not apply this product or allow it to drift to blooming crops or weeds while bees are actively visiting the treatment area.” 

Environmental Hazards Statements for Products Labeled for Indoor Uses Only 

“ENVIRONMENTAL HAZARDS” “This pesticide is extremely toxic to aquatic organisms, including fish and aquatic invertebrates. Do not contaminate water when disposing of equipment, washwater, or rinsate. See Directions for Use for additional precautions and requirements.” For indoor commercial, industrial or institutional products packaged 

in containers equal to or greater than 5 gallons or 50 lbs add the following statement: “Do not discharge effluent containing this product into lakes, streams, ponds, estuaries, oceans, or other waters unless in accordance with the 

requirements of a National Pollution Discharge Elimination System (NPDES) permit and the permitting authority has been notified in writing 

prior to discharge. Do not discharge effluent containing this product to sewer systems without previously notifying the local sewage treatment plant authority. For guidance contact your State Water Board or Regional Office of the EPA." 

PrecautionarHumans and 
Table 12. Summary of Labeling Changes for Tetramethrin 

Description Amended Labeling Language Plac

Environmental Hazards Statements for Products Labeled for Both Indoor and Outdoor Uses Only 

“ENVIRONMENTAL HAZARDS for TERRESTRIAL APPLICATIONS”Refer to appropriate consumer outdoor environmental hazard statements above. “ENVIRONMENTAL HAZARDS for INDOOR USE” “This pesticide is extremely toxic to aquatic organisms, including fish and aquatic invertebrates. Do not contaminate water when disposing of equipment, washwater, or rinsate. See Directions for Use for additional precautions and requirements.” For indoor commercial, industrial or institutional products packaged 

in containers equal to or greater than 5 gallons or 50 lbs add the following statement: “Do not discharge effluent containing this product into lakes, streams, ponds, estuaries, oceans, or other waters unless in accordance with the 

requirements of a National Pollution Discharge Elimination System (NPDES) permit and the permitting authority has been notified in writing 

prior to discharge. Do not discharge effluent containing this product to sewer systems without previously notifying the local sewage treatment plant authority. For guidance contact your State Water Board or Regional Office of the EPA." 

PrecautionarHumans and 

Restricted-Entry Interval for Products with Directions for use within the scope of the Worker Protection Standard for Agricultural Pesticides (WPS) For Products Subject to WPS as required by Supplement 3 of PR Notice 93-7 

“Do not enter or allow worker entry into treated areas during the restricted 

entry interval (REI) of 12 hours.” 

Directions foAgricultural 
Table 12. Summary of Labeling Changes for Tetramethrin 

Description Amended Labeling Language Plac

Early Entry Personal Protective Equipment For Products Subject to WPS as required by Supplement 3 of PR Notice 93-7 

“PPE required for early entry to treated areas that is permitted under the Worker Protection Standard and that involves contact with anything that has been treated, such as plants, soil, or water is coveralls, shoes and socks, and waterproof gloves.” 

Directions foUse Requirem

General Application Restrictions “Do not apply this product in a way that will contact workers or other 

persons, either directly or through drift. Only protected handlers may be in the area during application.” “Do not apply when food is present.” “Do not use in food areas of food handling establishments, restaurants, or other areas where food is commercially prepared or processed. Do not use in serving areas while food is exposed or facility is in operation. Serving 

areas are areas where prepared foods are served, such as dining rooms, but excluding areas where foods may be prepared or held. In the home, all food processing surfaces and utensils should be covered during treatment or thoroughly washed before use. Exposed food should be covered or removed.” 

Place in the Ddirectly abovBox 

Entry Restrictions for NonWPS Uses For products that do not contain directions for use that allow people 

to be present during application: “Do not enter or allow others to enter treated area until sprays have dried.” For products that contain directions for use that allow people to be present during application AND are labeled for use as a directed spray 

(does not apply to products applied directly to domestic animals): 

“Except when (insert application method or site that allows people to be present during application), do not enter or allow others to enter treated area until sprays have dried.” For products that contain directions for use that allow people to be present during application AND are labeled for use as a space spray: 

If no WPS uplace the appDirections foPrecautions aproduct also create a NonRequirementNotice 93-7 statement ins
Table 12. Summary of Labeling Changes for Tetramethrin 

Description Amended Labeling Language Plac

“Except when (insert application method or site that allows people to be present during application), do not enter or allow others to enter until vapors, mists, and aerosols have dispersed, and the treated area has been thoroughly ventilated.” For total release foggers (TRF) labeled for indoor use (see additional requirements in TRF section below): “Wait at least two (2) hours after application, then open windows, vents and doors for two more hours. If an odor is still detected additional ventilation is required.”

General Application Restrictions for all products that do not contain directions for use in drains or sewers 

Products labeled for use around or near floor drains must contain the 

following statement. 

 “Application is prohibited directly into sewers or drains, or to any area like a gutter where drainage to sewers, storm drains, water bodies, or aquatic habitat can occur. Do not allow the product to enter any drain during or after application.” 

Directions fo

General Application Restrictions for all products that contain directions for use in drains or sewers 

“Do not apply directly to sewers or drains, or to any area like a gutter where drainage to sewers, storm drains, water bodies, or aquatic habitat can occur, except as directed by this label.” 

Directions fo

General Application Restrictions for Total Release Foggers (TRF) labeled for indoor use 

Note to registrants: The following labeling was sent to pyrethrins and pyrethroid registrants on March 23, 2010. The following label statements are required to appear on TRF EUPs, except where manufacturers can satisfactorily explain to the Agency that an alternative approach would be adequate to address the causes of bug bomb exposure incidents. Use simple terms to express the volume of space treated in terms of linear dimensions, with an assumed ceiling height, rather than in terms of cubic feet. Update the current statements to follow this model in the Directions for Use: 

Example: “One canister of fogger will treat a room up to x feet by y feet with an 8 foot ceiling.” 

Directions fo
Table 12. Summary of Labeling Changes for Tetramethrin 

Description Amended Labeling Language Plac

All current restrictions and requirements regarding the size of the treated area remain unchanged. At a minimum include pictograms, where applicable, to illustrate the following list of restrictions and directions for use: 

• do not use multiple canisters in a room • do not use in small confined areas • turn off ignition sources • remove or cover exposed food • air out the room before entering 

Include the following directions that prohibit use in closed, confined spaces: 

• “Do not use in small, enclosed spaces such as closets, cabinets or 

under counters or tables. Use of a fogger in an enclosed space may cause the product to explode, resulting in injury to people or damage to property.” 

Include prominent headings using different font size or style (e.g., bold) in the directions, such as: 

• To Use This Product Correctly [before the standard language 

about small spaces and ignition sources] 

• Before you fog [cover food, remove pets, etc] • To Start Fogging [how to set up and activate] • Airing Out [how long] 

Include the following phrase in a prominent place in the directions and in boldface type: 

• “Vacate the treated house, individual apartment unit, or other 

structure immediately” 

In addition to the standard Precautionary Statements, add the following language to the Precautionary Statements section of the label: 

• “Breathing spray mist may be harmful.” 
Table 12. Summary of Labeling Changes for Tetramethrin 

Description Amended Labeling Language Plac

Include the following statement in bold font in the Directions for Use: 

• “Does not control bed bugs” 

Include the phrase “Do Not Re-enter for X Hours” in a prominent place in 

the directions and in boldface type. Include a clock face pictogram shading the entry restriction immediately above or below this direction. Example: 

Provide door knob hang tags at the point-of-sale with a space for 

customers to write-in when the entry restricted time has expired. 

• For example, the text on the hang tag could state: “Do not enter 

until [space for time] on [space for date].” 

Add the following statement to tell others of the treatment: 

• “Fill out and place hang-tag on the door to the treated area to alert 

family and others with access to the treated area not to enter for X hours.” 

Include label statements in both English and Spanish on all indoor total release fogger product labels. Verify that the Spanish language text is a true and accurate translation of the English text and submit verification 
Table 12. Summary of Labeling Changes for Tetramethrin 

Description Amended Labeling Language Plac

statement to EPA. Include both language versions of the labeling on the product container. Note: EPA is working to develop more general guidance for non-English pesticide labeling. If companies are interested in substituting a different language on product labels, in place of Spanish, please submit a rationale for such substitution along with the alternate label language. 

Additional Application Restrictions For Outdoor Residential Use 

Products labeled for General Outdoor Surface and Space Sprays (except outdoor fogging devices): “All outdoor applications must be limited to spot or crack-and-crevice treatments only, except for the following permitted uses: (1) Treatment to soil or vegetation around structures; (2) Applications to building foundations, up to a maximum height of 3 feet. Other than applications to building foundations, all outdoor applications to impervious surfaces such as sidewalks, driveways, patios, porches and structural surfaces (such as windows, doors, and eaves) are limited to spot 

and crack-and-crevice applications, only.” Note to registrant: If the end use product does not contain directions for use consistent with the exceptions above the exceptions may be eliminated from the label. Requirements for Granular Formulations labeled or intended for 

outdoor residential uses: “Apply this product directly to the lawn or garden area. Water treated area as directed on this label. Do not water to the point of run-off.” 

“Do not make applications during rain.” Requirements for Liquid, Dust, and Ready to Use Formulations products labeled or intended for outdoor residential uses: 

Directions foPrecautions a
Table 12. Summary of Labeling Changes for Tetramethrin 

Description Amended Labeling Language Plac

“Do not water the treated area to the point of run-off.” “Do not make applications during rain.” 

End Use Products Primarily Used by Consumers/Homeowners 

Maximum application rates eligible for reregistration are set forth in Appendix A.Environmental Hazards Statements for Outdoor Aerosols (including TRF) AND Outdoor Products Registered Only for 

Commercial Use Sites (eg. golfcourses). 

“ENVIRONMENTAL HAZARDS” “This pesticide is extremely toxic to aquatic organisms, including fish and aquatic invertebrates. Do not apply directly to water, or to areas where surface water is present, or to inter-tidal areas below the mean high water mark. Do not contaminate water when cleaning equipment or disposing of equipment washwater or rinsate.” “This product is highly toxic to bees exposed to direct treatment on blooming crops or weeds. Do not apply this product or allow it to drift to 

blooming crops or weeds while bees are actively visiting the area.” 

PrecautionarHumans and 

Environmental Hazard Statements on Liquid Concentrate consumer outdoor products (e.g., liquids mixed with water by the user for a tank sprayer or hoseend attachment) 

“This pesticide is extremely toxic to aquatic organisms, including fish and invertebrates. To protect the environment, do not allow pesticide to enter or run off into storm drains, drainage ditches, gutters or surface waters. Applying this product in calm weather when rain is not predicted for the next 24 hours will help to ensure that wind or rain does not blow or wash pesticide off the treatment area. Rinsing application equipment over the treated area will help avoid run off to water bodies or drainage systems. This pesticide is highly toxic to bees exposed to direct treatment on blooming crops or weeds. Do not apply this product or allow it to drift to blooming crops or weeds while bees are actively visiting the treatment area.” 

Environment

Environmental Hazard Statements on Liquid Ready-to-Use (except aerosols, including TRF) consumer outdoor products 

“This pesticide is extremely toxic to aquatic organisms, including fish and invertebrates. To protect the environment, do not allow pesticide to enter or run off into storm drains, drainage ditches, gutters or surface waters. Applying this product in calm weather when rain is not predicted for the 

Environment
Table 12. Summary of Labeling Changes for Tetramethrin 

Description Amended Labeling Language Plac

next 24 hours will help to ensure that wind or rain does not blow or wash pesticide off the treatment area. This pesticide is highly toxic to bees exposed to direct treatment on blooming crops or weeds. Do not apply this product or allow it to drift to blooming crops or weeds while bees are actively visiting the treatment area.” 

Environmental Hazards Statements for Products Labeled for Indoor Uses Only 

“ENVIRONMENTAL HAZARDS” “This pesticide is extremely toxic to aquatic organisms, including fish and aquatic invertebrates. Do not contaminate water when disposing of equipment, washwater, or rinsate. See Directions for Use for additional precautions and requirements.” For indoor commercial, industrial or institutional products packaged 

in containers equal to or greater than 5 gallons or 50 lbs add the following statement: “Do not discharge effluent containing this product into lakes, streams, ponds, estuaries, oceans, or other waters unless in accordance with the 

requirements of a National Pollution Discharge Elimination System (NPDES) permit and the permitting authority has been notified in writing 

prior to discharge. Do not discharge effluent containing this product to sewer systems without previously notifying the local sewage treatment plant authority. For guidance contact your State Water Board or Regional Office of the EPA." 

PrecautionarHumans and 

Environmental Hazards Statements for Products Labeled for Both Indoor and Outdoor Uses Only 

“ENVIRONMENTAL HAZARDS for TERRESTRIAL APPLICATIONS”Refer to appropriate consumer outdoor environmental hazard statements above. “ENVIRONMENTAL HAZARDS for INDOOR USE” “This pesticide is extremely toxic to aquatic organisms, including fish and 

PrecautionarHumans and 
Table 12. Summary of Labeling Changes for Tetramethrin 

Description Amended Labeling Language Plac

aquatic invertebrates. Do not contaminate water when disposing of equipment, washwater, or rinsate. See Directions for Use for additional precautions and requirements.” For indoor commercial, industrial or institutional products packaged in containers equal to or greater than 5 gallons or 50 lbs add the following statement: “Do not discharge effluent containing this product into lakes, streams, ponds, estuaries, oceans, or other waters unless in accordance with the requirements of a National Pollution Discharge Elimination System (NPDES) permit and the permitting authority has been notified in writing prior to discharge. Do not discharge effluent containing this product to sewer systems without previously notifying the local sewage treatment plant authority. For guidance contact your State Water Board or Regional Office of the EPA." 

Entry Restrictions for Non-WPS Uses For products that do not contain directions for use that allow people 

to be present during application: “Do not enter or allow others to enter treated area until sprays have dried.” For products that contain directions for use that allow people to be present during application AND are labeled for use as a directed spray 

(does not apply to products applied directly to domestic animals): 

“Except when (insert application method or site that allows people to be present during application), do not enter or allow others to enter treated area until sprays have dried.” For products that contain directions for use that allow people to be present during application AND are labeled for use as a space spray: “Except when (insert application method or site that allows people to be present during application), do not enter or allow others to enter until 

If no WPS uplace the appDirections foPrecautions aproduct also create a NonRequirementNotice 93-7 statement ins
Table 12. Summary of Labeling Changes for Tetramethrin 

Description Amended Labeling Language Plac

vapors, mists, and aerosols have dispersed, and the treated area has been thoroughly ventilated.” For total release foggers labeled for indoor use (see additional requirements in TRF section below): “Wait at least two (2) hours after application, then open windows, vents and doors for two more hours. If an odor is still detected additional ventilation is required.”

General Application Restrictions “Do not apply this product in a way that will contact adults, children, or 

pets, either directly or through drift.” 

Place at the bDirection for 

General Application Restrictions for all products that do not contain directions for use in drains or sewers 

Products labeled for use around or near floor drains must contain the 

following statement. 

 “Application is prohibited directly into sewers or drains, or to any area like a gutter where drainage to sewers, storm drains, water bodies, or aquatic habitat can occur. Do not allow the product to enter any drain during or after application.” 

Directions fo

General Application Restrictions for all products that contain directions for use in drains or sewers 

“Do not apply directly to sewers or drains, or to any area like a gutter where drainage to sewers, storm drains, water bodies, or aquatic habitat can occur, except as directed by this label.” 

Directions fo

Additional Application Restrictions For Outdoor Residential Use 

Products labeled for General Outdoor Surface and Space Sprays (except outdoor fogging devices: “All outdoor applications must be limited to spot or crack-and-crevice treatments only, except for the following permitted uses: (1) Treatment to soil or vegetation around structures; and, (2) Applications to building foundations, up to a maximum height of 3 feet. Other than applications to building foundations, all outdoor applications to impervious surfaces such as sidewalks, driveways, patios, porches and structural surfaces (such as windows, doors, and eaves) are limited to spot 

and crack-and-crevice applications, only.” Note to registrant: If the end use product does not contain directions for use consistent with the exceptions above the exceptions may be eliminated 

Directions foPrecautions a
Table 12. Summary of Labeling Changes for Tetramethrin 

Description Amended Labeling Language Plac

from the label. Requirements for Granular Formulations labeled or intended for outdoor residential uses: “Apply this product directly to the lawn or garden area. Water treated area as directed on this label. Do not water to the point of run-off.” “Do not make applications during rain.” Requirements for Liquid, Dust, and Ready to Use Formulations products labeled or intended for outdoor residential uses: “Do not water the treated area to the point of run-off.” “Do not make applications during rain.” 

Application Restrictions for End Use Products containing directions for indoor use 

“Do not apply when food is present. Exposed food should be covered or removed. All food preparation surfaces and utensils should be covered during treatment or thoroughly washed before use.” 

Directions foapplication r

General Application Restrictions for Total Release Foggers (TRF) labeled for indoor use 

Note to registrants: The following labeling was sent to pyrethrins and pyrethroid registrants on March 23, 2010. The following label statements are required to appear on TRF EUPs, except where manufacturers can satisfactorily explain to the Agency that an alternative approach would be adequate to address the causes of bug bomb exposure incidents. Use simple terms to express the volume of space treated in terms of linear dimensions, with an assumed ceiling height, rather than in terms of cubic feet. Update the current statements to follow this model in the Directions for Use: 

Example: “One canister of fogger will treat a room up to x feet by y feet with an 8 foot ceiling.” 

All current restrictions and requirements regarding the size of the 

Directions fo
Table 12. Summary of Labeling Changes for Tetramethrin 

Description Amended Labeling Language Plac

treated area remain unchanged. At a minimum include pictograms, where applicable, to illustrate the following list of restrictions and directions for use: 

• do not use multiple canisters in a room • do not use in small confined areas • turn off ignition sources • remove or cover exposed food • air out the room before entering 

Include the following directions that prohibit use in closed, confined spaces: 

• “Do not use in small, enclosed spaces such as closets, cabinets or 

under counters or tables. Use of a fogger in an enclosed space may cause the product to explode, resulting in injury to people or damage to property.” 

Include prominent headings using different font size or style (e.g., bold) in the directions, such as: 

• To Use This Product Correctly [before the standard language 

about small spaces and ignition sources] 

• Before you fog [cover food, remove pets, etc] • To Start Fogging [how to set up and activate] • Airing Out [how long] 

Include the following phrase in a prominent place in the directions and in boldface type: 

• “Vacate the treated house, individual apartment unit, or other 

structure immediately” 

In addition to the standard Precautionary Statements, add the following language to the Precautionary Statements section of the label: 

• “Breathing spray mist may be harmful.” 
Table 12. Summary of Labeling Changes for Tetramethrin 

Description Amended Labeling Language Plac

Include the following statement in bold font in the Directions for Use: 

• “Does not control bed bugs” 

Include the phrase “Do Not Re-enter for X Hours” in a prominent place in 

the directions and in boldface type. Include a clock face pictogram shading the entry restriction immediately above or below this direction. Example: 

Provide door knob hang tags at the point-of-sale with a space for 

customers to write-in when the entry restricted time has expired. 

• For example, the text on the hang tag could state: “Do not enter 

until [space for time] on [space for date].” 

Add the following statement to tell others of the treatment: 

• “Fill out and place hang-tag on the door to the treated area to alert 

family and others with access to the treated area not to enter for X hours.” 

Include label statements in both English and Spanish on all indoor total release fogger product labels. Verify that the Spanish language text is a true and accurate translation of the English text and submit verification statement to EPA. Include both language versions of the labeling on the 
Table 12. Summary of Labeling Changes for Tetramethrin 

Description Amended Labeling Language Plac

product container. Note: EPA is working to develop more general guidance for non-English pesticide labeling. If companies are interested in substituting a different language on product labels, in place of Spanish, please submit a rationale for such substitution along with the alternate label language. 
Appendix A. Non-Food and Non-Feed Use Patterns Subject to the Reregistration of Tetramethrin

Use Profile Maximum Application Rate

(Application Method) % Active 

Ingredient (% a.i.) Volume-based Area-based 

General IndoorA and Outdoor SprayB

(Trigger Pump Sprays, Low Pressure Hand Wand, Back Pack Sprayer) 

0.20 0.02 lb ai/gal 

solution 

0.00002 lb ai/ft2 

Aerosol Cans (Indoor & Outdoor Spray) 0.35 0.035 lb ai/gal 

solution 

0.000035 lb ai/ft2 

Indoor Total Release FoggerA 0.54 n/a n/a Animal Treatment (Aerosol Can) 

0.063 n/a n/a 

Outdoor Jet Sprays (intended for wasp and hornet use only) 

0.20 1-2 sec burst n/a 

Outdoor Fogging DevicesBC 0.10 n/a 0.0000001 lb ai/ft2 A Use sites include but are not limited to: commercial, industrial, institutional, and residential locations; agricultural structu

 eating establishments; animal kennels and sleeping quarters; empty greenhouses; hospitals. 

B Use sites include but are not limited to: commercial, industrial, institutional, and residential locations; compost piles; orn

paths. 

C Excludes RTU fogging devices. 
53

Appendix B. Data Supporting Guideline Requirements for Tetramethrin 

Data Supporting Guideline Requirements for the Reregistration of Tetramethrin

Guideline 

Number Study Description Citation(s) 

PRODUCT CHEMISTRY 

830.1550 Product Identity and Composition Required 

830.1600 Description of Materials Used Required 

830.1620 Description of Production Process Required 

830.1670 Discussion of Formation of Impurities Required 

830.1700 Preliminary Analysis Required 

830.1750 Certified Limits Required 

830.1800 Enforcement Analytical Method Required 

830.6302 Color Required 

830.6303 Physical State Required 

830.6304 Odor Required 

830.6313 Stability Required 

830.7000 pH Required 

830.7050 UV/Visible Absorption Required 

830.7200 Melting Point Required 

830.7220 Boiling Point Required 

830.7300 Density Required 

830.7370 Dissociation Constant Required 

830.7550 

830.7570 Octanol / Water Partition Coefficient Required 

830.7840 

830.7860 Solubility Required 

830.7950 Vapor Pressure Required 

ECOLOGICAL EFFECTS 

850.1010 Aquatic Invertebrate Acute 41609609 

850.1025 Oyster Acute Toxicity Test Data gap 

850.1035 Mysid Acute Toxicity Test Data gap 

850.1045 Penaeid Acute Toxicity Test Data gap 

850.1055 Bivalve Acute Toxicity Test Data gap 

850.1075 Fish Acute Toxicity 

 Freshwater 41609608, 41609607 

 Estuarine / Marine Data gap 

850.1300 Aquatic Invertebrate Life Cycle (Freshwater) Data gap 

850.1350 Aquatic Invertebrate Life Cycle (Marine) Data gap 

850.1400 Fish Early Life-Stage (Freshwater and 

Marine) Data gap 

850.1500 Fish Full Life-Cycle (Freshwater and 

Marine) Data gap 

850.1710 Oyster BCF Data gap 
54

Data Supporting Guideline Requirements for the Reregistration of Tetramethrin

Guideline 

Number Study Description Citation(s) 

850.1730 Fish BCF Data gap 

850.1850 Aquatic Food Chain Transfer Data gap 

850.2100 Avian Acute Oral Toxicity 41609604 

850.2200 Avian Subacute Dietary Toxicity 41609605, 41609606 

850.2300 Avian Reproduction Toxicity Data gap 

850.2400 Wild Mammal Toxicity 00063574, 00161842 

850.3020 Honey Bee Acute Contact Toxicity 41609613 

850.3030 Residues on Foliage Honeybee Toxicity 41940801 

850.3040 Honeybee Feeding Toxicity Test Data gap 

850.4100 Seedling Emergence and Growth Data gap 

850.4150 Vegetative Vigor Data gap 

850.4400 Aquatic Plant Growth Data gap 

850.4500 Algal Plant Toxicity Data gap 

850.4550 Algal Plant Toxicity Data gap 

TOXICOLOGY 

870.1100 Acute Oral Toxicity 42146405 

870.1200 Acute Dermal Toxicity 00063574, 40276101 

870.1300 Acute Inhalation Toxicity Required 

870.2400 Acute Eye Irritation 41609611 

870.2500 Acute Dermal Irritation Required 

870.2600 Skin Sensitization Required 

870.3100 90-Day Oral Toxicity in Rodents 42146404 

870.3150 90-Day Oral Toxicity in Non-rodents 42146403, 41698902 

870.3200 21/28 -Day Dermal Toxicity 41995004 

870.3465 90-Day Inhalation Toxicity 42012101, 41995003 

870.3700 Prenatal Developmental Toxicity Required 

42189202, 41995005, 00114369, 00114370

870.3800 Reproduction and Fertility Effects, 2-

Generation Reproduction 00114371, 00137656, 00137658, 00161842

870.4100 Chronic Toxicity 

41723301, 40009401, 40280401, 

00156488, 40007501, 41723302, 

42189301, 44083501 

870.4200 Carcinogenicity 41723301, 40009401, 40280401, 

00156488, 40007501, 41723302 

870.4300 Combined Chronic Toxicity/Carcinogenicity 00158951, 40276301, 44096001 

870.5265 Gene Mutation (Ames assay) 40276001, 40275801 

870.5385 Bone Marrow Chromosomal Aberration Test 40275901, 42414401, 42414402, 42414403

870.5550 Unscheduled DNA Synthesis in mammalian 

cells in culture 40778401, 40275801 

870.6200 Neurotoxicity Screening battery 

 (a) Acute Neurotoxicity Required 

42601501, 42601502, 43152701 

 (b) Subchronic Neurotoxicity Required 
55

Data Supporting Guideline Requirements for the Reregistration of Tetramethrin

Guideline 

Number Study Description Citation(s) 

870.6300 Developmental Neurotoxicity Study Required 

870.7485 Metabolism and Pharmacokinetics 42448901, 42448902 

Special Study – motor activity in male and 

female mice post-natally exposed by 

inhalation 

44222801 

ENVIRONMENTAL FATE 

835.1230 Leaching and Adsorption / Desorption 41995007, 42212901 

835.1410 Laboratory Volatility Data gap 

835.2120 Hydrolysis 41995006 

835.2240 Photodegradation in Water 00164634, 43773401 

835.2370 Photodegradation in Air Data gap 

835.2410 Photodegradation on Soil Data gap 

835.4100 Aerobic Soil Metabolism 42563301 

835.4200 Anaerobic Soil Metabolism Data gap 

835.4300 Aerobic Aquatic Metabolism Data gap 

835.4400 Anaerobic Aquatic Metabolism Data gap 

835.6100 Terrestrial Field Dissipation 42622401, 42622402 

835.6200 Aquatic (Sediment) Dissipation Data gap 

835.6400 Combination and Tank Mixes Dissipation Data gap 

835.7100 Ground Water Monitoring Data gap 

835.8100 Field Volatility Data gap 
56

Appendix C. Technical Support Documents 

 Additional documentation in support of the Tetramethrin RED is maintained in the OPP 

Regulatory Public Docket, located in Room S-4400 One Potomac Yard (South Building), 2777 

S. Crystal Drive, Arlington, VA. It is open Monday through Friday, excluding legal holidays, 

from 8:30 a.m. to 4:00 p.m. All documents may be viewed in the OPP Docket room or viewed 

and/or downloaded via the Internet at http://www.regulations.gov. The Agency’s documents in 

support of this RED include the following: 

1. Daiss, B. Tetramethrin Health Effects Division’s Risk Assessment for Reregistration 

Eligibility Decision. June 18, 2008. 

2. Crowley, M. Tetramethrin: Phase IV Revised Occupational and Residential Exposure 

Assessment and Recommendations for the Reregistration Eligibility Decision. June 13, 

2008. 

3. Eckel, W. et al. Revised Environmental Fate and Ecological Risk Assessment for the Reregistration Eligibility Decision on Tetramethrin. February 5, 2008. 

4. Abdel-Saheb, I. Revised Drinking Water Assessment for Tetramethrin Use as a Rapid 

Knockdown Agent Against Flying and Crawling Insects. February 5, 2008. 

5. Crowley, M. HED Review of “Evaluation of Potential Human Health Risks Associated 

with Residential Uses of Tetramethrin: Supplemental Assessment for Indoor Space 

Spray” (EPA MRID 47713101). April 27, 2009. 

6. Daiss, B. Tetramethrin: Benchmark Dose Analysis of Toxicity Endpoint for Incidental 

Oral Exposure. January 6, 2010. 

7. Crowley, M. HED Review of “Evaluation of Potential Human Health Risks Associated 

with Residential Uses of Tetramethrin: Revised Supplemental – Short-Term Oral 

Benchmark Dose Analysis” (EPA MRID 47921601). February 25, 2010. 
57

Appendix D. Bibliography 

 In addition to the studies listed in Appendix B, this bibliography contains additional 

citations considered to be part of the database supporting the reregistration decision for 

Tetramethrin. 

In addition to the MRID study references listed in Appendix B, this bibliography contains the 

expanded study citations as well as additional literature considered to be part of the database 

supporting the reregistration decision for Tetramethrin. 

MRID Citation Reference 

63574 Miyamoto, J.; Kadota, T.; Kohda, H. (1977) Acute Oral and Dermal Toxicities of 

Neopynamin in Mice and Rats. (Unpublished study received Apr 21, 1978 under 

10308-1; prepared by Sumitomo Chemi- cal Co., Ltd., Japan, submitted by 

Sumitomo Chemical Co., Ltd., Baltimore, Md.; CDL:233835-A) 

114369 Sato, T.; Narama, K. (1982) Reproduction Test of Neopynamin: Part 2. Teratology 

Study in Rats: Doc. Code IT-01-0076. (Transla- tion; unpublished study received Sep 

20, 1982 under 10308-1; prepared by Sumitomo Chemical Co., Ltd., Japan, 

submitted by Sumitomo Chemical Co., Ltd., Baltimore, MD; CDL:248342-B) 

114370 Sato, T.; Narama, K. (1982) Reproduction Test of Neopynamin: Part 3. Teratology 

Study in Rabbits: Doc. Code IT-01-0077. (Transla- tion; unpublished study received 

Sep 20, 1982 under 10308-1; prepared by Sumitomo Chemical Co., Ltd., Japan, 

submitted by Sumitomo Chemical Co., Ltd., Baltimore, MD; CDL:248342-C) 

114371 Sato, T.; Tagawa, G.; Narama, K. (1982) Reproduction Test of Neo- pynamin: Part 

4. Perinatal and Postnatal Study in Rats: Doc. Code IT-01-0078. (Translation; 

unpublished study received Sep 20, 1982 under 10308-1; prepared by Sumitomo 

Chemical Co., Ltd., Japan, submitted by Sumitomo Chemical Co., Ltd., Balti- more, 

MD; CDL:248342-D) 

131413 Gabriel, K. (1981) Guinea Pig Contact Dermal Irritation/Sensitization--Buehler 

Method: TL-2252: Project No. 81-2354A. (Unpublished study received Sep 19, 

1983 under 1021-1492; prepared by Biosearch, Inc., submitted by McLaughlin 

Gormley King Co., Minneapolis, MN; CDL:251313-E) 

137656 Hazleton Laboratories America, Inc. (1980) One-generation Reproduc- tion Study--

Rats: Neo-Pynamin: Individual Animal Data: Project No. 343-106; IT-01-0081. 

(Unpublished study received Apr 30, 1982 under 10308-1; submitted by Sumitomo 

Chemical Co., Ltd., Baltimore, MD; CDL:247530-A) 

137658 Rutter, H. (1974) One-generation Reproduction Study--Rats: Neo-Pyn- amin: Project 

No. 343-106; IT-41-0042. Final rept. (Unpub- lished study received Apr 30, 1982 

under 10308-1; prepared by Hazleton Laboratories, Inc., submitted by Sumitomo 

Chemical Co., Ltd., Baltimore, MD; CDL:247530-C) 

156488 Pence, D. (1986) Chronic Toxicity Study in Rats: Neopynamin Technical: 

Addendum to Final Report: Project No. 343-117. Unpublished study prepared by 

Hazleton Laboratories America, Inc. 575 p. 

158951 Cox, R. (1986) Combined Chronic Toxicity and Oncogenicity Study in Mice: 

Neopynamin: Final Report: Project No. 343-136. Unpublish- ed study prepared by 

Hazleton Laboratories America, Inc. 4980 p. 
58

MRID Citation Reference 

161842 Pence, D.; Wolfe, G.; Kulwich, B. (1986) Two-generation Reproduction Study in 

Rats: Neopynamin Forte: Final Report: Project No. 343-147. Unpublished study 

prepared by Hazleton Labo- ratories America, Inc. 418 p. 

164634 Chen, Y.; Casida, J. (1970) Photodecomposition of pyrethrin I, allethrin, phthalthrin, 

and dimethrin modifications in the acid moiety. Pyrethum Post 10(3):7-16. 

40007501 Cox, R. (1986) Chronic Toxicity Study in Rats, Neopynamin Techni- cal: Addendum 

III to Final Report: Hazleton Project No. 343-117. Unpublished study prepared by 

Hazleton Laboratories America, Inc. 7 p. 

40009401 Cox, R. (1986) Two-year Dietary Administration in the Rat: Neo Pynamin: 

Addendum 1: Final Report: Project No.: 343-107. Unpub- lished study prepared by 

Hazleton Laboratories America, Inc. 831 p. 

40275701 Suzuki, H.; Miyamoto, J. (1975) Mutagenicity of Some Synthetic Pyrethroids in 

Bacterial Test System: Laboratory Project ID: ET-50-0024. Unpublished study 

prepared by Sumitomo Chemical Co., Ltd. 14 p. 

40275801 Ding, C.; Yu, Y.; Zhang, J.; et al. (1985) Genotoxicity of tetramethrin in mammalian 

cells and salmonella typhimuriam. Journal of the Zhejiang Univ. of Medicine 

14(1):1-4. 

40275901 Kogiso, S.; Hara, M.; Yoshitake, A.; et al. (1986) In vivo Chromo- somal Aberration 

Test of Neopynamin in Mouse Bone Marrow Cells: Laboratory Project ID: IT-60-

0197. Unpublished study prepared by Sumitomo Chemical Co., Ltd. 12 p. 

40276001 Kogiso, S.; Yamada, F.; Hara, M.; et al. (1987) Reverse Mutation Test of 

Neopynamin in Salmonella typhimurium and Escherichia coli: Lab Project No.: IT70-0205. Unpublished study prepared by Sumitomo Chemical Co., Ltd. 18 p. 

40276101 Suzuki, T.; Sako, H.; Okuno, Y.; et al. (1987) Acute Dermal Toxicity of 

Neopynamin in Rabbits: Lab Project No.: IT-70-0207. Unpublished study prepared 

by Takarazuka Research Center. 17 p. 

40276301 Cox, R. (1987) Combined Chronic Toxicity and Oncogenicity Study in Mice: 

Neopynamin Technical: Amendment to Final Report (IT-71- 0210). Unpublished 

study prepared by Hazleton Laboratories America, Inc. 1487 p. 

40280401 Cox, R.; Jones, S. (1987) Historical Control Data for Liver Adenoma Incidence 

among Mice, and Supporting Information: Hazleton Product No. 343-107. 

Unpublished study prepared by Hazleton Laboratories America, Inc. 53 p. 

40778401 Kogiso, S. (1988) In vitro Unscheduled DNA Synthesis (UDS) Assay of 

Neopynamine in Rat Hepatocytes: Study No. 1280. Unpublished study prepared by 

Sumitomo Chemical Co., Ltd. 54 p. 

41054701 Knarr, R.D. (1988) Exposure of Applicators to Propoxur During Trigger-Pump Spray 

Application of a Liquid Product. Unpublished study prepared by Mobay 

Corporation. 195 p. 

41609604 Culotta, J. et al. (1990) Neo-Pynamin: An Acute Oral Toxicity Study with the 

Bobwhite: (IW-01-0008): Final Report: Lab Project Number: IW/01/0008. 

Unpublished study prepared by Sumitomo Chemical Company. 17 p. 

41609605 Long, R. ; Hoxter, K. ; Smith, G. (1990) Neo-Pynamin: A Dietary LC50 Study with 

the Northern Bobwhite: Lab Project Number: 166/133. Unpublished study prepared 

by Sumitomo Chemical Company. 54 p. 
59

MRID Citation Reference 

41609606 Long, R. ; Hoxter, K. ; Smith, G. (1990) Neo-Pynamin: A Dietary LC50 Study with 

the Mallard: Lab Project Number: 166/134. Unpublished study prepared by 

Sumitomo Chemical Company. 54 p. 

41609607 Bowman, J. (1990) Acute Flow-through Toxicity of Neo-Pynamin to Bluegill: 

(Lepomis-macrochirus): Lab Project Number: IW/01/0010. Unpublished study 

prepared by Analytical Bio-Chemistry Labora- tories, Inc. 188 p. 

41609608 Bowman, J. ; Gormley, M. (1990) Acute Flow-Through Toxicity of Neo- Pynamin to 

Rainbow Trout (Oncorhynchus mykiss): Lab Project Number: IW/01/0011. 

Unpublished study prepared by Analytical Bio-Chemistry Laboratories, Inc., 189 p. 

41609609 Burgess, D. (1990) Acute Flow-through Toxicity of Neo-Pynamin to Daphnia 

magna: Lab Project Number: IW/01/0009. Unpublished Study Prepared by 

Analytical Bio-Chemistry Laboratories, Inc., 176 p. 

41609611 Nakanishi, T. (1990) Primary Eye and Skin Irritation Tests with Neo-Pynamin in 

Rabbits: Lab Project Number: IT/00/0217. Unpublished study prepared by 

Biochemistry and Toxicology Laboratory. 20 p. 

41609613 Hoxter, K. ; Smith, G. ; Jaber, M. (1990) Neo-Pynamin: An Acute Contact Toxicity 

Study with the Honey Bee: Lab Project Number: 1W/01/0012. Unpublished study 

prepared by Sumitomo Chemical Co. Ltd. 13 p. 

41698902 Pence, D. ; Hagen, W. ; Alsaker, R. et al. (1981) Subchronic Toxicity in Dogs: Lab 

Project No: 343-127. Unpublished study prepared by Hazleton Laboratories 

America, Inc. 398 p. 

41723301 Cox, R. (1974) Two-Year Dietary Administration in the Rat, Part A: Final Report, 

Neo-Pynamin: Lab Project Number: 343-107. Unpub- lished study prepared by 

Technology Services Group, Inc. 262 p. 

41723302 Pence, H.; Serotam, D.; Alsaker, R.; et al. (1981) Chronic Toxicity Study in Rats: 

Neo-Pynamin Technical: Lab Project Number: 343- 117. Unpublished study 

prepared by Technology Services Group, Inc. 443 p. 

41940801 Hoxter, K.; Lynn, S. (1991) Neo-Pynamin: A Foliage Residue Toxicity Study With 

the Honey Bee: Lab Project Number: 166-151C. Unpub- lished study prepared by 

Wildlife International Ltd. 23 p. 

41995003 Kawaguchi, S. (1991) Three Month Inhalation Toxicity Study of Neo- Pynamin in 

Rats (Determination of the no Observed Effect Level): Lab Project Number: 2279. 

Unpublished study prepared by Sumitomo Chemical Co., Ltd, Environmental Health 

Science Lab. 938 p. 

41995004 Osheroff, M. (1991) 21-Day Dermal Toxicity Study in Rats with Neo- Pynamin: 

Final Report: Lab Project Number: 343/232. Unpublished study prepared by 

Hazleton Laboratories America, Inc. 206 p. 

41995005 Robinson, K.; Washer, G.; Noveroske, J. (1991) An Oral Teratology Study of NeoPynamin in the Rabbit: Research Report: Lab Project Number: 95088. Unpublished 

study prepared by Bio-Research Labo- ratories Ltd. 325 p. 

41995006 Katagi, T.; Mikami, N.; Matsuo, M.; et al. (1991) Hydrolysis of Trans-Neo-Pynamin 

in Buffered Aqueous Solutions: Lab Project Number: HYD90001: HYD91001. 

Unpublished study prepared by Sumi- tomo Chemical Co., Ltd, Environmental 

Health Science Lab. 127 p. 
60

MRID Citation Reference 

41995007 Yoshimura, J.; Mikami, N.; Matsuo, M.; et al. (1991) Adsorption and Desorption of 

Tetramethrin in Water-Soil Suspension Systems: Lab Project Number: ADS91001. 

Unpublished study prepared by Sumitomo Chemical Co., Ltd, Environ. Health 

Science Lab. 60 p. 

42012101 Kawaguchi, S. (1991) Three-Month Inhalation Toxicity Study of Neo- Pynamin in 

Rats: Lab Project Number: 2189. Unpublished study prepared by Sumitomo Chem. 

Co. 1055 p. 

42146401 Suzuki, T.; Kohda, H.; Misaki, Y.; et al. (1981) Acute and Sub- acute Inhalation 

Toxicity Studies of NeoPynamin Forte in Rats: Lab Project Number: IT-10-0144. 

Unpublished study prepared by Sumitomo Chemical Co., Ltd. 78 p. 

42146402 Hosokowa, S.; Hiromori, T.; Seki, T.; et al. (1981) Additional 6 Month Sub-chronic 

Toxicity Study of Neo-Pynamin Forte in Rats : Lab Project Number: IT-10-0140. 

Unpublished study prepared by Sumitomo Chemical Co., Ltd. 61 p. 

42146403 Hosokowa, S.; Hiromori, T.; Seki, T.; et al. (1981) Six-month Subchronic Toxicity 

Study of Neo-Pynamin Forte in Rats: Lab Project Number: IT-00-0139. Unpublished 

study prepared by Sumitomo Chemical Co., Ltd. 97 p. 

42146404 Hosokowa, S. (1982) One Month Oral Subacute Toxicity Study with Neo-Pynamin 

Forte in Rats: Lab Project Number: IT-20-0188. Unpublished study prepared by 

Sumitomo Chemical Co., Ltd. 65 p. 

42146405 Kohda, H.; Misaki, Y.; Suzuki, T. (1981) Acute Oral Subcutan- eous, Intraperitoneal 

and Dermal Neo-Pynamin Forte in Rats and Mice: Lab Project Number: IT-00-0086. 

Unpublished study pre- pared by Sumitomo Chemical Co., Ltd. 38 p. 

42189202 Robinson, K.; Washer, G.; Noveroske, J. (1991) An Oral Range- Finding Teratology 

Study of Neo-Pynamin in the Rat: Lab Project Number: 95219. Unpublished study 

prepared by Bio-Research Labs., Ltd. 520 p. 

42189301 Dalgard, D. (1991) Chronic Toxicity Study in Dogs with Neo- Pynamin: IT-11-0242: 

Lab Project Number: 343-235. Unpublished study prepared by Sumitomo Chemical 

Co., Ltd. 406 p. 

42212901 Yoshimura, J.; Mikami, N.; Matsuo, M.; et al. (1992) Aged Column Leaching Study 

of ?carbon 14|-Tetramethrin in Soil: Lab Project Number: LEA91001. Unpublished 

study prepared by Sumitomo Chemical Co., Ltd. 81 p. 

42414401 Murli, H. (1992) Single Acute Exposure Dose Selection Study on Neo-Pynamin: 

Final Report: Lab Project Number: 12400-0-59IP. Unpublished study prepared by 

Hazleton Washington, Inc. 20 p. 

42414402 Murli, H. (1992) Bone Marrow Toxicity Study for In vivo Murine Bone Marrow 

Cytogenetics Assay with Neo-Pynamin: Final Report: Lab Project Number: 12400-1-

459IP: IT-21-0253. Unpublished study prepared by Hazleton Washington, Inc. 21 p. 

42414403 Murli, H. (1992) Mutagenicity Test on Neo-Pynamin Measuring Chromosomal 

Aberrations In vivo in Mouse Bone Marrow Cells: Final Report: Lab Project 

Number: 12400-0-451IP: IT-21-0254. Unpublished study prepared by Hazleton 

Washington, Inc. 35 p. 

42448901 Shiba, K. (1992) Metabolism of (1RS, trans)-Tetramethrin in Rats: Lab Project 

Number: 2556: IM-20-0015. Unpublished study prepared by Sumitomo Chemical 

Co., Ltd. 393 p. 
61

MRID Citation Reference 

42448902 Shiba, K. (1992) Metabolism of (1RS,cis)-Tetramethrin in Rats: Lab Project 

Number: 2557: IM-20-0016. Unpublished study prepared by Sumitomo Chemical 

Co., Ltd. 382 p. 

42563301 Yoshimura, J.; Mikami, N.; Matsuo, M. (1992) Aerobic Soil Metabolism Study of 

(Carbon 14)-(1RS)-trans-Tetramethrin: Lab Project Number: SOI90001. 

Unpublished study prepared by Sumitomo Chemical Co., Ltd. 209 p. 

42601501 Robinson, K.; Benjamin, W.; Noveroske, J. (1992) An Acute Study of the Potential 

Effects of Orally Administered Neo-Pynamin on Behavior and Neuromorphology in 

Rats: Lab Project Number: 97137. Unpublished study prepared by Bio-Research 

Labs, Inc. 609 p. 

42601502 Robinson, K.; Benjamin, W.; Noveroske, J. (1992) A Time of Peak Behavioral 

Effects Study of a Single Oral Administration of Neo-Pynamin in Rats: Lab Project 

Number: 97139. Unpublished study prepared by Bio-Research Labs, Inc. 69 p. 

42622401 Ver Hey, M. (1992) A Terrestrial Field Dissipation Study with Tetramethrin (NeoPynamin) Applied for Control of Insects in Plants (California Field Study): Lab 

Project Number: SUMITOMO-1150. Unpublished study prepared by Colorado 

Analytical Research & Development Corp. 397 p. 

42622402 Ver Hey, M. (1992) A Terrestrial Field Dissipation Study with Tetramethrin (NeoPynamin) Applied for Control of Insects in Plants (Florida Field Study): Lab Project 

Number: SUMITOMO-1150. Unpublished study prepared by Colorado Analytical 

Research & Development Corp. 450 p. 

43152701 Robinson, K.; Benjamin, W.; Noveroske, J. (1993) An Acute Study of the Potential 

Effects of Orally Administered Neopynamin on Behavior and Neuromorphology in 

Rats: Supplemental Volume: Lab Project Number: 97137: IT/21/0258. Unpublished 

study prepared by Bio-Research Lab., Ltd. 6 p. 

43261603 Woollen, B.; Marsh, J.; Thornley, K. (1992) Cypermethrin: Pharmacokinetics in Man 

Following A Single Dermal Dose: Lab Project Number: CTL/R/1077. Unpublished 

study prepared by Zeneca Central Toxicology Lab. 40 p. 

43773401 Chen, Y.; Casida, J. (1969) Photodegradation of pyrethrin I, allethrin, phthalthrin, 

and dimethrin: Modifications in the acid moiety. J. Agr. Food Chem. 17(2):208-215. 

44083501 Walker, M. (1996) 52-Week Toxicity Study in Dogs with Neo-Pynamin: Final 

Report: Lab Project Number: CHV 343-249: IT-0276: 343-249. Unpublished study 

prepared by Corning Hazleton Inc. 456 p. 

44096001 Moore, M. (1995) Dietary Oncogenicity Study in Mice with Neo-Pynamin: Final 

Report: Lab Project Number: HWA 343-242: IT-51-0272: 343-242. Unpublished 

study prepared by Hazleton Washington, Inc. 1332 p. 

44222801 Ivens, I.; Pauluhn, J.; Schmuck, G. (1996) Tetramethrin: Motor Activity 

Measurements in Male and Female Mice Postnatally Exposed to Tetramethrin by 

Inhalation (Including Measuremenets of Muscarinic Acetylcholine Receptors in the 

Brain): Lab Project Number: IT-0277: T3059027: 25749. Unpublished study 

prepared by Bayer AG. 219 p. 
62

MRID Citation Reference 

45485501 McKeown, K. (2001) Determination of the Dislodgeability of Tetrachlorvinphos 

(TCVP) from the Fur of Dogs Following the Application of an Insecticide Powder, 

Pump Spray of Aerosol: Lab Project Number: 2001-3: 1555. Unpublished study 

prepared by Hartz Mountain Corp. 137 p. 

46099001 Jacobs, L.; Driver, J.; Pandian, M. (2003) Residential Exposure Joint Venture 

National Pesticide Use Survey - Design, Implementation, Analysis Methods and 

Results. Project Number: 03/REJV/12M/002. Unpublished study prepared by NFO 

Worldgroup and Infoscientific.com, Inc. 155 p. 

46188602 Non-Dietary Exposure Task Force (NDETF) Study Volume 2. Post-Application 

Deposition Measurements for Pyrethrins & Piperonyl Butoxide Following Use of a 

Total Release Indoor Fogger. 

46188613 NDETF Volume 13. Measurement of Transfer of Pyrethrin and Piperonyl Butoxide 

Residues from Vinyl and Carpet Flooring Treated with a Fogger Formulation to DSS 

Wetted Hands Following a Single Hand Press. 

46188618 NDEFT Volume 18. Measurement of Air Concentration, Dermal Exposure, and 

Deposition of Pyrethrin and Piperonyl Butoxide Following the Use of an Aerosol 

Spray. 

46188623 NDETF Volume 23. Post-Application Deposition Measurements for Permethrin & 

Piperonyl Butoxide Following Use of a Total Release Indoor Fogger. 

46188629 Selim, S. (2003) Measurement of Transfer of Permethrin and Piperonyl Butoxide 

Residues from Vinyl and Carpet Flooring Treated with a Fogger Formulation to DSS 

Wetted Hands Following a Single Hand Press: Final Report. Project Number: 

01/031/PY01, 02/0014. Unpublished study prepared by Toxcon Health Sciences 

Research Centre, En-Cas Analytical Laboratories and Selim and Associates. 161 p. 

46382501 Selim, S. (2004) A Single Dose, Open Label Study to Investigate the Absorption and 

Excretion of Orally Administrated or Dermally Applied (Carbon 14)-Labeled 

Pyrethrin I (PI) to Healthy Male Volunteers. Project Number: SEL/0204, BTAZ/103, 

PBR/013911. Unpublished study prepared by Charles River Laboratories and Bayer 

Ag Institute of Biological Monitoring and Pharma Bio-Research Clinics, B.V. 433 p. 

46493701 Holden, L., and Thomas Osimitz. A Statistical Assessment of Generic 

Transferability Relationships for Pyrethrins, the Synthetic Pyrethroids, and the 

Synergists Piperonyl Butoxide and MGK-264. Prepared for the Non-Dietary 

Exposure Task Force. March 1, 2005. 

47713101 Driver, J.; Ross, J.; Pandian, M.; et. al.; (2009) Evaluation of Potential Human Health 

Risks Associated with Residential Uses of Tetramethrin: Supplemental Assessment 

for Indoor Space Spray. Project Number: VBC/001/09. Unpublished study prepared 

by Infoscientific.Com. 14 p. 

47921601 Driver, J.; Ross, J.; Pandian, M.; et al. (2009) Evaluation of Potential Human Health 

Risks Associated with Residential Uses of Tetramethrin: Revised Supplemental - 

Short-Term Oral Benchmark Dose Analysis. Project Number: VBC/003/09. 

Unpublished study prepared by Infoscientific.com. 215 p. 

 Cremlyn, R. 1978. Pesticides: Preparation and Mode of Action, John Wiley and 

Sons, Chichester, UK. 
63

MRID Citation Reference 

 Crofton, K.M., Kehn, L.S., and Gilbert, M.E. (1995) Vehicle and route dependent 

effects of a pyrethroid insecticide, deltamethrin, on motor function in the rat. 

Neurotoxicology and Teratology 17:489-495 

 Fletcher, J. S., J. E. Nellessen, and T. G. Pleeger, 1994. Literature review and 

evaluation of the EPA Food-chain ( ) nomogram, an instrument for estimating 

pesticide residues on plants. Environmental Toxicology and Chemistry 3 (9): 1383-

11391. 

 Hill, I.R. 1985. Effects on non-target organisms in terrestrial and aquatic 

environments. In: J.P. Leahey, Editor, The Pyrethroid Insecticides, Taylor and 

Francis, London, UK. 

 Hoerger, F., and E.E. Kenaga. 1972. Pesticide residues on plants: Correlation of 

representative data as a basis for estimation of their magnitude in the environment. In 

F. Coulston and F. Korte, eds., Environmental Quality and Safety: Chemistry, 

Toxicology, and Technology, Georg Thieme Publ, Stuttgart, West Germany. Pp. 9-

28. 

 Kohda, H. (1985). Acute toxicity of S-1844 in rates. IH178505. Sumitomo 

Chemical Co. Ltd. Takarazuka Research Center, Hyogo, Japan. Unpublished report 

(LLT-50-0002). 

 Lloyd .J. et al. 1963. Further studies on a pyrethrum-resistant strain of the grain 

weevil, Sitolhilus franarius (L.).J. Sci. Food Agric . 655-663. 

Pesticide Handlers Exposure Database (PHED) Surrogate Exposure Guide 

 Tulve, N.S., J.C. Suggs, T. McCurdy, E.A. Cohen Hubal and J. Moya. 2002. J. Exp 

Anal Environ Epid. 12:259-264. 

 Wolansky, M. J., Gennings, C., nd Crofton, K.M. (2006). Relative potencies for 

acute effects of pyrethroids on motor function in rats. Toxicol. Sci. 89, 271-277 
64

Appendix E. Tetramethrin Acute Mammalian Toxicity Batching 

 UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

WASHINGTON, D.C. 20460 

OFFICE OF 

PREVENTION, PESTICIDES 

AND TOXIC SUBSTANCES 

December 3, 2008 

MEMORANDUM

 

SUBJECT: Tetramethrin [PC Codes 069003], Acute Mammalian Toxicity Batching 

Appendix for Tetramethrin RED Document. 

FROM: Marianne Lewis, Biologist [sign. M.Lewis 12/3/08]

Product Reregistration Branch 

Special Review and Reregistration Division (7508P) 

TO: Monica Wait, CRM 

Reregistration Branch III 

Special Review and Reregistration Division (7508P) 

Attached is the batching appendix for Tetramethrin. Please let me know if you have any 

questions regarding this document. 
65

EPA'S BATCHING OF TETRAMETHRIN PRODUCTS FOR MEETING ACUTE TOXICITY 

DATA REQUIREMENTS FOR REREGISTRATION 

In an effort to reduce the time, resources and number of animals needed to fulfill the 

acute toxicity data requirements for reregistration of products containing TETRAMETHRIN as 

the active ingredient, the Agency has batched products which can be considered similar for 

purposes of acute toxicity. Factors considered in the sorting process include each product's active 

and inert ingredients (identity, percent composition and biological activity), type of formulation 

(e.g., emulsifiable concentrate, aerosol, wettable powder, granular, etc.), and labeling (e.g., 

signal word, use classification, precautionary labeling, etc.). Note that the Agency is not 

describing batched products as "substantially similar" since some products within a batch may 

not be considered chemically similar or have identical use patterns. 

Using available information, batching has been accomplished by the process described in 

the preceding paragraph. Notwith-standing the batching process, the Agency reserves the right to 

require, at any time, acute toxicity data for an individual product should the need arise. 

Registrants of products within a batch may choose to cooperatively generate, submit or 

cite a single battery of six acute toxicological studies to represent all the products within that 

batch. It is the registrants' option to participate in the process with all other registrants, only some 

of the other registrants, or only their own products within a batch, or to generate all the required 

acute toxicological studies for each of their own products. If a registrant chooses to generate the 

data for a batch, he/she must use one of the products within the batch as the test material. If a 

registrant chooses to rely upon previously submitted acute toxicity data, he/she may do so 

provided that the data base is complete and valid by today's standards (see acceptance criteria 

attached), the formulation tested is considered by EPA to be similar for acute toxicity, and the 

formulation has not been significantly altered since submission and acceptance of the acute 

toxicity data. Regardless of whether new data is generated or existing data is referenced, 

registrants must clearly identify the test material by EPA Registration Number. If more than one 

confidential statement of formula (CSF) exists for a product, the registrant must indicate the 

formulation actually tested by identifying the corresponding CSF. 

In deciding how to meet the product specific data requirements, registrants must follow 

the directions given in the Data Call-In Notice and its attachments appended to the RED. The 

DCI Notice contains two response forms which are to be completed and submitted to the Agency 

within 90 days of receipt. The first form, "Data Call-In Response," asks whether the registrant 

will meet the data requirements for each product. The second form, "Requirements Status and 

Registrant's Response," lists the product specific data required for each product, including the 

standard six acute toxicity tests. A registrant who wishes to participate in a batch must decide 

whether he/she will provide the data or depend on someone else to do so. If a registrant supplies 

the data to support a batch of products, he/she must select one of the following options: 

Developing Data (Option 1), Submitting an Existing Study (Option 4), Upgrading an Existing 

Study (Option 5) or Citing an Existing Study (Option 6). If a registrant depends on another's 

data, he/she must choose among: Cost Sharing (Option 2), Offers to Cost Share (Option 3) or 

Citing an Existing Study (Option 6). If a registrant does not want to participate in a batch, the 

choices are Options 1, 4, 5 or 6. However, a registrant should know that choosing not to 
66

participate in a batch does not preclude other registrants in the batch from citing his/her studies 

and offering to cost share (Option 3) those studies. 

Many products containing TETRAMETHRIN have been previously batched in the PBO, 

Pyrethrins, & MGK 264 REDs. If a TETRAMETHRIN product registration number cannot be 

found in the following tables, please refer to the batching appendices for PBO, Pyrethrins, & 

MGK 264. One hundred and thirty eight products have been found which contain 

TETRAMETHRIN as the active ingredient, and have not been previously batched in the PBO, 

Pyrethrins, & MGK 264 REDs. These products have been placed into seventeen batches and a 

No Batch group in accordance with the active and inert ingredients and type of formulation. 

 

Batching Instructions: 

No Batch: Each product in this Batch should generate their own data. 

NOTE: The technical acute toxicity values included in this document are for informational 

purposes only. The data supporting these values may or may not meet the current acceptance 

criteria. 

Batch 1 EPA Reg. No. Percentage Active Ingredient 

10308-1 95.0 

73049-145 95.0 

73049-258 100.0 

Batch 2 EPA Reg. No. Percentage Active Ingredient 

270-356 Tetramethrin: 0.400 

Phenothrin: 0.300 

Pyriproxyfen: 0.015 

1021-177 Tetramethrin: 0.400 

Phenothrin: 0.300 

Pyriproxyfen: 0.015 

2517-76 Tetramethrin: 0.400 

Phenothrin: 0.300 

Pyriproxyfen: 0.015 

9444-165 Tetramethrin: 0.400 

Phenothrin: 0.300 

Pyriproxyfen: 0.015 

28293-215 Tetramethrin: 0.400 

Phenothrin: 0.300 

Pyriproxyfen: 0.015 

Batch 3 EPA Reg. No. Percentage Active Ingredient 

 192-196 Tetramethrin: 0.400 

Phenothrin: 0.300 
67

Pyriproxyfen: 0.015 

1021-1622 Tetramethrin: 0.400 

Phenothrin: 0.300 

Pyriproxyfen: 0.015 

2724-663 Tetramethrin: 0.400 

Phenothrin: 0.300 

Pyriproxyfen: 0.015 

40849-55 Tetramethrin: 0.400 

Phenothrin: 0.300 

Pyriproxyfen: 0.015 

68543-23 Tetramethrin: 0.400 

Phenothrin: 0.300 

Pyriproxyfen: 0.015 

Batch 4 EPA Reg. No. Percentage Active Ingredient 

4822-436 Tetramethrin: 0.50 

Cypermethrin: 0.15 

9688-254 Tetramethrin: 0.10 

Cypermethrin: 0.60 

Batch 5 EPA Reg. No. Percentage Active Ingredient 

769-584 Tetramethrin: 0.20 

Esfenvalerate: 0.10 

9444-145 Tetramethrin: 0.20 

Esfenvalerate: 0.10 

Batch 6 EPA Reg. No. Percentage Active Ingredient 

1021-1715 Tetramethrin: 0.20 

Permethrin: 0.20 

8848-83 Tetramethrin: 0.20 

Permethrin: 0.20 

Batch 7 EPA Reg. No. Percentage Active Ingredient 

73049-313 Tetramethrin: 0.20 

Permethrin: 0.50 

73049-314 Tetramethrin: 0.10 

Permethrin: 0.25 

73049-328 Tetramethrin: 0.20 

Permethrin: 0.50 

Batch 8 EPA Reg. No. Percentage Active Ingredient 
68

73049-436 Tetramethrin: 0.10 

Permethrin: 0.10 

73049-437 Tetramethrin: 0.20 

Permethrin: 0.20 

Batch 9 EPA Reg. No. Percentage Active Ingredient 

2724-533 Tetramethrin: 0.40 

Permethrin: 0.30 

8845-67 Tetramethrin: 0.40 

Permethrin: 0.30 

Batch 10 EPA Reg. No. Percentage Active Ingredient 

192-153 Tetramethrin: 0.286 

Permethrin: 0.572 

239-2535 Tetramethrin: 0.050 

Permethrin: 0.100 

2724-541 Tetramethrin: 0.050 

Permethrin: 0.100 

2724-547 Tetramethrin: 0.050 

Permethrin: 0.100 

8845-84 Tetramethrin: 0.050 

Permethrin: 0.100 

46515-21 Tetramethrin: 0.029 

Permethrin: 0.057 

46515-30 Tetramethrin: 0.029 

Permethrin: 0.057 

 Tetramethrin: 0.40 

Permethrin: 0.30 

Batch 11 EPA Reg. No. Percentage Active Ingredient 

4822-271 Tetramethrin: 0.200 

Permethrin: 0.200 

4822-423 Tetramethrin: 0.119 

Permethrin: 0.124 

4822-533 Tetramethrin: 0.200 

Permethrin: 0.200 

Batch 12 EPA Reg. No. Percentage Active Ingredient 

1021-1780 Tetramethrin: 0.20 

Phenothrin: 0.20 

1021-1806 Tetramethrin: 0.15 

Permethrin: 0.15 
69

Batch 13 EPA Reg. No. Percentage Active Ingredient 

478-101 Tetramethrin: 0.20 

Phenothrin: 0.20 

498-160 Tetramethrin: 0.20 

Phenothrin: 0.20 

8845-68 Tetramethrin: 0.20 

Phenothrin: 0.20 

46813-10 Tetramethrin: 0.20 

Phenothrin: 0.20 

Batch 14 EPA Reg. No. Percentage Active Ingredient 

1021-1775 Tetramethrin: 0.2000 

Phenothrin: 0.2000 

1021-1808 Tetramethrin: 0.2000 

Phenothrin: 0.2000 

2724-540 Tetramethrin: 0.0500 

Phenothrin: 0.1000 

2724-542 Tetramethrin: 0.0286 

Phenothrin: 0.0572 

2724-543 Tetramethrin: 0.05 

Phenothrin: 0.10 

8845-83 Tetramethrin: 0.05 

Phenothrin: 0.10 

Batch 15 EPA Reg. No. Percentage Active Ingredient 

2724-536 Tetramethrin: 0.2 

Phenothrin: 0.4 

5887-118 Tetramethrin: 0.2 

Phenothrin: 0.4 

Batch 16 EPA Reg. No. Percentage Active Ingredient 

192-184 Tetramethrin: 0.200 

Phenothrin: 0.125 

498-156 Tetramethrin: 0.200 

Phenothrin: 0.125 

506-140 Tetramethrin: 0.200 

Phenothrin: 0.125 

1021-1649 Tetramethrin: 0.200 

Phenothrin: 0.125 

3862-127 Tetramethrin: 0.200 

Phenothrin: 0.125 
70

4313-87 Tetramethrin: 0.200 

Phenothrin: 0.125 

5887-158 Tetramethrin: 0.200 

Phenothrin: 0.125 

7405-71 Tetramethrin: 0.200 

Phenothrin: 0.125 

7754-44 Tetramethrin: 0.200 

Phenothrin: 0.125 

9444-181 Tetramethrin: 0.200 

Phenothrin: 0.125 

10806-105 Tetramethrin: 0.200 

Phenothrin: 0.125 

11623-38 Tetramethrin: 0.200 

Phenothrin: 0.125 

40849-52 Tetramethrin: 0.200 

Phenothrin: 0.125 

44446-54 Tetramethrin: 0.200 

Phenothrin: 0.125 

46515-44 Tetramethrin: 0.200 

Phenothrin: 0.125 

55809-3 Tetramethrin: 0.200 

Phenothrin: 0.125 

68543-8 Tetramethrin: 0.200 

Phenothrin: 0.125 

Batch 17 EPA Reg. No. Percentage Active Ingredient 

192-189 Tetramethrin: 0.20 

Phenothrin: 0.20 

239-2523 Tetramethrin: 0.05 

Phenothrin: 0.10 

239-2524 Tetramethrin: 0.20 

Phenothrin: 0.20 

239-2525 Tetramethrin: 0.25 

Phenothrin: 0.15 

478-93 Tetramethrin: 0.25 

Phenothrin: 0.15 

498-114 Tetramethrin: 0.20 

Phenothrin: 0.19 

499-355 Tetramethrin: 0.40 

Phenothrin: 0.30 

506-157 Tetramethrin: 0.20 

Phenothrin: 0.20 

706-83 Tetramethrin: 0.20 

Phenothrin: 0.20 

769-609 Tetramethrin: 0.25 
71

Phenothrin: 0.15 

1021-1587 Tetramethrin: 0.25 

Phenothrin: 0.15 

1021-1588 Tetramethrin: 0.20 

Phenothrin: 0.20 

1021-1667 Tetramethrin: 0.20 

Phenothrin: 0.20 

1021-1862 Tetramethrin: 0.10 

Phenothrin: 0.10 

2724-529 Tetramethrin: 0.25 

Phenothrin: 0.20 

2724-530 Tetramethrin: 0.25 

Phenothrin: 0.15 

2724-537 Tetramethrin: 0.20 

Phenothrin: 0.20 

2724-545 Tetramethrin: 0.20 

Phenothrin: 0.20 

2724-597 Tetramethrin: 0.25 

Phenothrin: 0.15 

2724-604 Tetramethrin: 0.20 

Phenothrin: 0.20 

2724-615 Tetramethrin: 0.20 

Phenothrin: 0.40 

2915-59 Tetramethrin: 0.20 

Phenothrin: 0.20 

5887-123 Tetramethrin: 0.20 

Phenothrin: 0.19 

5887-159 Tetramethrin: 0.25 

Phenothrin: 0.15 

7056-99 Tetramethrin: 0.25 

Phenothrin: 0.15 

8845-63 Tetramethrin: 0.25 

Phenothrin: 0.15 

8848-38 Tetramethrin: 0.20 

Phenothrin: 0.20 

8848-42 Tetramethrin: 0.40 

Phenothrin: 0.30 

9688-54 Tetramethrin: 0.20 

Phenothrin: 0.40 

10088-116 Tetramethrin: 0.25 

Phenothrin: 0.15 

10806-41 Tetramethrin: 0.25 

Phenothrin: 0.14 

10807-61 Tetramethrin: 0.20 

Phenothrin: 0.20 

10807-182 Tetramethrin: 0.25 
72

Phenothrin: 0.15 

11623-11 Tetramethrin: 0.20 

Phenothrin: 0.20 

11715-82 Tetramethrin: 0.20 

Phenothrin: 0.20 

28293-160 Tetramethrin: 0.40 

Phenothrin: 0.30 

40849-4 Tetramethrin: 0.20 

Phenothrin: 0.20 

40859-46 Tetramethrin: 0.20 

Phenothrin: 0.40 

46515-40 Tetramethrin: 0.25 

Phenothrin: 0.15 

46515-43 Tetramethrin: 0.20 

Phenothrin: 0.20 

64240-23 Tetramethrin: 0.25 

Phenothrin: 0.15 

No Batch EPA Reg. No. Percentage Active Ingredient 

478-126 Tetramethrin: 0.2 

Permethrin: 0.4 

706-109 Tetramethrin: 0.200 

Phenothrin: 0.125 

769-931 Tetramethrin: 0.25 

Phenothrin: 0.15 

769-938 Tetramethrin: 0.284 

Resmethrin: 0.120 

769-939 Tetramethrin: 2.84 

Resmethrin: 2.96 

1021-1384 80.0 

1021-1386 Tetramethrin: 8.9 

Phenothrin: 8.9 

1021-1387 Tetramethrin: 12.5 

Phenothrin: 7.5 

1021-1437 Tetramethrin: 8.0 

Phenothrin: 16.0 

1021-1505 Tetramethrin: 12.30 

Phenothrin: 9.23 

1021-1613 Tetramethrin: 0.20 

Esfenvalerate: 0.03 

1021-1640 Tetramethrin: 10.00 

Phenothrin: 6.26 

1021-1652 Tetramethrin: 10.01 

Esfenvalerate: 1.57 

1021-1659 Tetramethrin: 8.89 
73

Permethrin: 8.90 

1021-1856 Tetramethrin: 0.05 

Cypermethrin: 0.05 

2724-538 Tetramethrin: 12.0 

Phenothrin: 3.83 

2724-599 Tetramethrin: 0.40 

Phenothrin: 0.23 

Butoxypolypropylene glycol: 51.92 

4822-513 Tetramethrin: 0.35 

Permethrin: 0.10 

Allethrin: 0.10 

4822-514 Tetramethrin: 0.3 

Permethrin: 0.1 

7056-185 Tetramethrin: 0.2 

Permethrin: 0.2 

10807-191 Tetramethrin: 0.2 

Esfenvalerate: 0.1 

73049-233 Tetramethrin: 25.0 

Resmethrin: 10.6 

73049-255 Tetramethrin: 0.250 

Resmethrin: 0.106 

73049-260 Tetramethrin: 26.64 

Resmethrin: 5.85 

73049-262 Tetramethrin: 0.25 

Resmethrin: 0.25 

73049-264 Tetramethrin: 16.67 

Resmethrin: 7.06 

73049-265 Tetramethrin: 20.84 

Resmethrin: 20.84 

73049-315 Tetramethrin: 16.0 

Resmethrin: 40.0 

73049-434 Tetramethrin: 10.0 

Permethrin: 10.0