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National Drinking Water Database


Metolachlor in Iowa


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

The Most Polluted Communities in Iowa

13 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)
3Graettinger Municipal Water Supply
Graettinge, IA
9335 of 53.36 ppb
(0.2 to 16 ppb)
4City of Holstein
Holstein, IA
1,4771 of 11.7 ppb
(1.7 ppb)
5Sioux Rapids Water Department
Sioux Rapi, IA
1,2981 of 11.6 ppb
(1.6 ppb)
6Peterson Municipal Water Supply
Peterson, IA
3721 of 11.3 ppb
(1.3 ppb)
7Hawarden Water Supply
Hawarden, IA
2,4787 of 70.53 ppb
(0.2 to 1.3 ppb)
8Wall Lake Water Supply
Wall Lake, IA
8661 of 10.4 ppb
(0.4 ppb)
9West Branch Water Works
West Branc, IA
2,18812 of 120.33 ppb
(0.2 to 0.7 ppb)
10University Water System
Iowa City, IA
26,6841 of 10.3 ppb
(0.3 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

Violation Summary for Metolachlor in Iowa

There are no violations reported for this contaminant in Iowa