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National Drinking Water Database


Methomyl in Missouri


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.

The Most Polluted Communities in Missouri

11 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)
4Cass Co Pwsd #7
Freeman, MO
4,1001 of 40.42 ppb
(0 to 1.68 ppb)
5Plattsburg
Plattsburg, MO
2,3541 of 40.32 ppb
(0 to 1.28 ppb)
6Cameron
Cameron, MO
9,7881 of 40.32 ppb
(0 to 1.27 ppb)
7Hamilton
Hamilton, MO
1,7501 of 40.28 ppb
(0 to 1.13 ppb)
8Bethany
Bethany, MO
3,1601 of 50.24 ppb
(0 to 1.2 ppb)
9Rocky Ridge Manor
Mansfield, MO
421 of 20.02 ppb
(0 to 0.04 ppb)
10Big Valley Park Mhp
Joplin, MO
1081 of 2< 0.01 ppb
(< .01 to 0.0048 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

Violation Summary for Methomyl in Missouri

There are no violations reported for this contaminant in Missouri