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National Drinking Water Database


National Drinking Water Database - Chemical Contaminants

Methomyl


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

Methomyl is a neurotoxic insecticide used on field, fruit and vegetable crops; EPA classifies methomyl as "Restricted Use Pesticide" because of its high acute oral toxicity to humans.

 
Detected
Found above
health guidelines
Found above
legal limit
States
4
-
-
Water utilities
25
-
-
People Served
324,681
-
-

Health Concerns for Methomyl:


Methomyl Exposure by State

Water utilities in 4 states have reported detecting Methomyl in treated tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies.

StateWater Suppliers with Methomyl contamination
SystemsPopulation
Delaware12243,025
California153,903
Missouri1126,953
New York1800
Total25324,681

The Most Polluted Communities

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

Ranked by highest average Methomyl level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Maysville
Maysville, MO
1,1001 of 40.53 ppb
(0 to 2.13 ppb)
2Adrian
Adrian, MO
1,7001 of 40.53 ppb
(0 to 2.1 ppb)
3Rich Hill
Rich Hill, MO
1,4611 of 30.47 ppb
(0 to 1.42 ppb)
4Mcwa, Genesee West
Rochester, NY
8001 of 20.45 ppb
(0 to 0.9 ppb)
5Cass Co Pwsd #7
Freeman, MO
4,1001 of 40.42 ppb
(0 to 1.68 ppb)
6Plattsburg
Plattsburg, MO
2,3541 of 40.32 ppb
(0 to 1.28 ppb)
7Cameron
Cameron, MO
9,7881 of 40.32 ppb
(0 to 1.27 ppb)
8Hamilton
Hamilton, MO
1,7501 of 40.28 ppb
(0 to 1.13 ppb)
9Bethany
Bethany, MO
3,1601 of 50.24 ppb
(0 to 1.2 ppb)
10Windsong Farms
Newark, DE
4501 of 20.2 ppb
(0 to 0.4 ppb)

Health Based Limits for Methomyl

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.200 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.200 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.300 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.300 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.900 ppb

Testing Summary for Methomyl

Are tests routinely required for Methomyl by federal law?No
Water suppliers reporting tests for Methomyl (2004-2009):11,586 of 47,576
Average testing rate for water supplier reporting tests (2004-2009):0.4 per year

Allergies/immunotoxicity

Type of concern: Reference:
Known human immune system toxicant or allergen National Library of Medicine HazMap

Neurotoxicity

Type of concern: Reference:
Strong evidence of human neurotoxicity Chemicals known to be neurotoxic to humans

Endocrine disruption

Type of concern: Reference:
Human disruptor - moderate evidence European Commission on Endocrine Disruption
Limited evidence of endocrine disruption Japanese National Institute of Health Sciences, 1997
endocrine - weight of evidence unknown/unassessed/unreview: published lit review or major tox study Illinois EPA Chemicals Associated with Endocrine System
endocrine - weight of evidence unknown/unassessed/unreview: published lit review or major tox study Our Stolen Future Endocrine Disruptors

Developmental/reproductive toxicity

Type of concern: Reference:
Human nervous system toxicant - moderate evidence Chemicals known to be neurotoxic to humans

Occupational hazards

Type of concern: Reference:
Allowed workplace exposures restricted to very low doses European Union - Classification & Labelling
Allowed workplace exposures restricted to low doses RTECS®- TLV/BEI,2007

Organ system toxicity (non-reproductive)

Type of concern: Reference:
Classified as very toxic or harmful European Union - Classification & Labelling
One or more animal studies show classified as toxic effects at moderate doses (low dose studies may be unavailable for this ingredient) National Library of Medicine HazMap

Cancer

Type of concern: Reference:
One or more in vitro tests on mammalian cells show positive mutation results RTECS®- Environmental and Molecular Mutagenesis 1994
One or more in vitro tests on mammalian cells show positive mutation results RTECS®- Environmental Research 1987
One or more in vitro tests on mammalian cells show positive mutation results RTECS®- Food and Chemical Toxicology 2007
One or more in vitro tests non-mammalian cells show positive mutation results RTECS®- Rivista di Scienza e Technologia degli Alimenti e di Nutrizione Umana 1976

Ecotoxicology

Type of concern: Reference:
Wildlife and environmental toxicity European Union - Classification & Labelling
Wildlife and environmental toxicity Illinois EPA Chemicals Associated with Endocrine System



Government, industry, academic studies and classifications

government/industry list/academic study appears on list as classification(s)
European Union - Classification & LabellingMETHOMYL•Very toxic
•Very toxic if swallowed
•Dangerous for the environment
•Very toxic to aquatic organisms
Illinois EPA Chemicals Associated with Endocrine SystemMETHOMYL•EPA: suspected endocrine disruptor
European Commission on Endocrine DisruptionMETHOMYLHH-CAT2;WF-CAT3b
National Library of Medicine HazMapMETHOMYL•Skin Sensitizer - An agent that can induce an allergic reaction in the skin or lungs: Yes;
•Other Poison: Carbamate;
•TLV (ACGIH) - Threshold limit value (ACGIH): 2.5 mg/m3;
Our Stolen Future Endocrine DisruptorsMETHOMYL
Japanese National Institute of Health Sciences, 1997METHOMYL•Endocrine toxicity hazards: suspected
RTECS®- TLV/BEI,2007METHOMYL• occupationally related - ACGIH TLV (human TWA)
RTECS®- Environmental and Molecular Mutagenesis 1994METHOMYL• mutagenic - Positive mutation assay: Cytogenetic Analysis ( human lym)
• mutagenic - Positive mutation assay: DNA Damage ( human lym)
• mutagenic - Positive mutation assay: Micronucleus test ( human lym)
RTECS®- Environmental and Molecular Mutagenesis 1994METHOMYL• mutagenic - Positive mutation assay: DNA Damage (mouse ipr)
RTECS®- Environmental Research 1987METHOMYL• mutagenic - Positive mutation assay: Cytogenetic Analysis (mouse orl)
• mutagenic - Positive mutation assay: sperm (mouse orl)
RTECS®- Food and Chemical Toxicology 2007METHOMYL• mutagenic - Positive mutation assay: Cytogenetic Analysis (hamster ovr)
RTECS®- Rivista di Scienza e Technologia degli Alimenti e di Nutrizione Umana 1976METHOMYL• mutagenic - Positive mutation assay: Mutation in Micro-organism (Saccharomyces cerevisiae )



references

government/industry list/academic study reference
European Union - Classification & LabellingCPS&Q (Consumer Products Safety & Quality) formely known as ECB (European Chemicals Bureau). 2008. Classification and Labelling: Chemicals: Annex VI of Directive 67/548/EEC through the 31st ATP.
Illinois EPA Chemicals Associated with Endocrine SystemIllinois EPA (Illinois Environmental Protection Agency). 2000. Preliminary list of chemicals associated with endocrine system effects in animals and humans (*) or in vitro (+). In EPA (U.S. Environmental Protection Agency) 2000. Handbook for Non-Cancer Health Effects Valuation, Appendix C.
European Commission on Endocrine DisruptionEU (European Union)- Strategy for Endocrine Disrupters 2007. Commision on endocrin disruption requested by the European Parliament in 1998.
National Library of Medicine HazMapNLM (National Library of Medicine). 2006. HazMap — Occupational Exposure to Hazardous Agents.
Our Stolen Future Endocrine DisruptorsColborn T, D Dumanoski, JP Myers. 2006. Widespread Pollutants with Endocrine-disrupting Effects. Updated from original listing in "Our Stolen Future" (1996).
Scorecard.org Toxicity InformationJapanese National Institute of Health Sciences. Lists of Paradigmatic Chemicals. http://www.nihs.go.jp/hse/endocrine-e/paradigm/paradigm.html, Keith, L.H. (ed.). Environmental Endocrine Disruptors. John Wiley & Sons, NY. 1997. http://www.wileyeurope.com/cda/product/0,,0471191450%7Cdesc%7C3037,00.html, World Wildlife Fund. Our Stolen Future. Widespread Pollutants with Endocrine-disrupting Effects. http://www.ourstolenfuture.org/Basics/chemlist.htm. The WWF list is derived from references detailed at http://www.ourstolenfuture.org/Sources/chemsources.htm and was originally published in: Colborn, T., F.S. vom Saal, and A.M. Soto. Developmental Effects of Endocrine-Disrupting Chemicals In Wildlife and Humans. Environmental Health Perspectives 101(5): 378-384. 1993.
RTECS®- TLV/BEI,2007RTECS®- TLV/BEI,2007
RTECS®- Environmental and Molecular Mutagenesis 1994RTECS®- Environmental and Molecular Mutagenesis. (Alan R. Liss, Inc., 41 E. 11th St., New York, NY 10003) V.10- 23,306,1994
RTECS®- Environmental and Molecular Mutagenesis 1994RTECS®- Environmental and Molecular Mutagenesis. (Alan R. Liss, Inc., 41 E. 11th St., New York, NY 10003) V.10- 24,235,1994
RTECS®- Environmental Research 1987RTECS®- Environmental Research. (Academic Press, Inc., 1 E. First St., Duluth, MN 55802) V.1- 1967- 42,362,1987
RTECS®- Food and Chemical Toxicology 2007RTECS®- Food and Chemical Toxicology. (Pergamon Press Inc., Maxwell House, Fairview Park, Elmsford, NY 10523) V.20- 45,928,2007
RTECS®- Rivista di Scienza e Technologia degli Alimenti e di Nutrizione Umana 1976RTECS®- Rivista di Scienza e Technologia degli Alimenti e di Nutrizione Umana. Review of Science and Technology of Food and Human Nutrition. (Bologna, Italy) V.5-6, 1975-76. Discontinued. 6,161,1976

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