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National Drinking Water Database


National Drinking Water Database - Chemical Contaminants

Metolachlor


Status: Unregulated - EPA has not established a maximum legal limit in tapwater for this contaminant.

Metolachlor is an herbicide applied on corn, soybeans, peanuts, cotton and pod crops. [read more]

 
Detected
Found above
health guidelines
Found above
legal limit
States
20
-
-
Water utilities
115
-
-
People Served
6,715,878
-
-

Health Concerns for Metolachlor:


Metolachlor Exposure by State

Water utilities in 20 states have reported detecting Metolachlor in treated tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies.

StateWater Suppliers with Metolachlor contamination
SystemsPopulation
Texas183,055,764
Nebraska14804,126
Virginia2412,408
Ohio1380,000
California2374,414
Illinois15310,939
Delaware9281,733
Maryland16259,667
Florida1253,263
Iowa13197,309
Pennsylvania3145,292
Missouri772,785
Rhode Island261,309
Arkansas152,000
North Carolina118,275
Massachusetts116,000
Wisconsin411,951
Alabama15,136
New York23,200
Minnesota2307
Total1156,715,878

The Most Polluted Communities

115 water utilities reported detecting Metolachlor in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Metolachlor level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Kiron Water Supply
Kiron, IA
2731 of 113 ppb
(13 ppb)
2Gladbrook Water Supply
Gladbrook, IA
1,0156 of 610.68 ppb
(6.7 to 16 ppb)
3Town of Burkeville
Burkeville, VA
8006 of 154.17 ppb
(0 to 18.5 ppb)
4Graettinger Municipal Water Supply
Graettinge, IA
9335 of 53.36 ppb
(0.2 to 16 ppb)
5City of Holstein
Holstein, IA
1,4771 of 11.7 ppb
(1.7 ppb)
6Kushla Water District
Eight Mile, AL
5,1361 of 21.7 ppb
(0 to 3.4 ppb)
7Sioux Rapids Water Department
Sioux Rapi, IA
1,2981 of 11.6 ppb
(1.6 ppb)
8Fort Plain (V) Water Works
Fort Plain, NY
2,4004 of 71.41 ppb
(0 to 3.22 ppb)
9Evansville
Evansville, IL
7409 of 251.36 ppb
(0 to 8.6 ppb)
10Peterson Municipal Water Supply
Peterson, IA
3721 of 11.3 ppb
(1.3 ppb)

Health Based Limits for Metolachlor

StandardDescriptionLevel
Lifetime health-based limit, non-cancer riskConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for a lifetime of exposure. The Lifetime health-based limit (or Health Advisory, HA) is based on exposure for a a 70-kg adult consuming 2 liters of water per day. Source: U.S. Environmental Protection Agency.700 ppb
Health-Based Screening LevelA benchmark concentration of contaminants in water that may be of potential concern for human health, if exceeded. For noncarcinogens, the HBSL represents the contaminant concentration in drinking water that is not expected to cause any adverse effects over a lifetime of exposure. For carcinogens, the HBSL range represents the contaminant concentration in drinking water that corresponds to an excess estimated lifetime cancer risk of 1 chance in 1 million to 1 chance in 10 thousand. Source: U.S. Geological Survey.700 ppb
Children's health-based limit for 1-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for up to one day of exposure. The One-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.2000 ppb
Children's health-based limit for 10-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic effects for up to ten days of exposure. The Ten-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.2000 ppb
Drinking Water Equivalent LevelA lifetime exposure concentration protective of adverse, noncarcinogenic health effects, that assumes all of the exposure to a contaminant is from drinking water. Source: U.S. Environmental Protection Agency.3500 ppb

Testing Summary for Metolachlor

Are tests routinely required for Metolachlor by federal law?No
Water suppliers reporting tests for Metolachlor (2004-2009):14,028 of 47,576
Average testing rate for water supplier reporting tests (2004-2009):0.4 per year

Cancer

Type of concern: Reference:
One or more in vitro tests on mammalian cells show positive mutation results RTECS®- Mutation Research 1992
One or more in vitro tests non-mammalian cells show positive mutation results RTECS®- Mutation Research 1984

Organ system toxicity (non-reproductive)

Type of concern: Reference:
One or more animal studies show sense organ effects at moderate doses (low dose studies may be unavailable for this ingredient) RTECS®- Nippon Noyaku Gakkaishi 1989

Irritation (skin, eyes, or lungs)

Type of concern: Reference:
One or more animal studies show skin irritation at moderate doses RTECS®- Ciba-Geigy Toxicology Data/Indexes 1977



Government, industry, academic studies and classifications

government/industry list/academic study appears on list as classification(s)
RTECS®- Ciba-Geigy Toxicology Data/Indexes 1977O-ACETOTOLUIDIDE, 2-CHLORO-6'-ETHYL-N-(2-METHOXY-1-METHYLETHYL)-• skin - Primary skin irritant (rabbit )
RTECS®- Mutation Research 1984O-ACETOTOLUIDIDE, 2-CHLORO-6'-ETHYL-N-(2-METHOXY-1-METHYLETHYL)-• mutagenic - Positive mutation assay: Mutation in Micro-organism (Salmonella typhimurium )
• mutagenic - Positive mutation assay: Gene Conversion and Mitotic Recombination (Saccharomyces cerevisiae )
RTECS®- Mutation Research 1992O-ACETOTOLUIDIDE, 2-CHLORO-6'-ETHYL-N-(2-METHOXY-1-METHYLETHYL)-• mutagenic - Positive mutation assay: Cytogenetic Analysis ( human lym)
RTECS®- Nippon Noyaku Gakkaishi 1989O-ACETOTOLUIDIDE, 2-CHLORO-6'-ETHYL-N-(2-METHOXY-1-METHYLETHYL)-• sense organ - Primary eye irritant (rabbit )



references

government/industry list/academic study reference
RTECS®- Ciba-Geigy Toxicology Data/Indexes 1977RTECS®- Ciba-Geigy Toxicology Data/Indexes. (Ciba-Geigy Corp., 556 Morris Ave., Summit, NJ 07901) -,-,1977
RTECS®- Mutation Research 1984RTECS®- Mutation Research. (Elsevier Science Pub. B.V., POB 211, 1000 AE Amsterdam, Netherlands) V.1- 136,233,1984
RTECS®- Mutation Research 1992RTECS®- Mutation Research. (Elsevier Science Pub. B.V., POB 211, 1000 AE Amsterdam, Netherlands) V.1- 281,295,1992
RTECS®- Nippon Noyaku Gakkaishi 1989RTECS®- Nippon Noyaku Gakkaishi. Journal of the Pesticide Science Society of Japan. (Nippon Noyaku Gakkai, 1-43-11, Komagome, Toshima-ku, Tokyo 170, Japan) V.1- 14,103,1989

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