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National Drinking Water Database


Heptachlor epoxide in Illinois


Heptachlor epoxide is a beakdown product of heptachlor, a highly toxic and carcinogenic termiticide banned from most applications in the U.S. since 1988. [read more]

The Most Polluted Communities in Illinois

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

Ranked by highest average Heptachlor epoxide level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Mathersville
Mathersville, IL
7791 of 20.03 ppb
(0 to 0.07 ppb)
2Harvel
Harvel, IL
2131 of 20.02 ppb
(0 to 0.04 ppb)
3Expressway Mhp
Quincy, IL
981 of 30.02 ppb
(0 to 0.05 ppb)
4New Haven
New Haven, IL
4931 of 3< 0.01 ppb
(0 to 0.03 ppb)
5Greenville
Greenville, IL
5,6001 of 13< 0.01 ppb
(0 to 0.1 ppb)
6Maeystown
Maeystown, IL
2301 of 6< 0.01 ppb
(0 to 0.03 ppb)
7Ashmore
Ashmore, IL
8001 of 5< 0.01 ppb
(0 to 0.03 ppb)
8Loves Park
Loves Park, IL
22,4761 of 7< 0.01 ppb
(0 to 0.04 ppb)
9Dixie Estates Subdivision
Crete, IL
1751 of 12< 0.01 ppb
(0 to 0.04 ppb)
10Ashland
Ashland, IL
1,3611 of 14< 0.01 ppb
(0 to 0.05 ppb)

Health Based Limits for Heptachlor epoxide

StandardDescriptionLevel
Maximum Contaminant Limit Goal (MCLG)A non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.0 ppb
EPA Human Health Water Quality CriteriaWater quality criteria set by the US EPA provide guidance for states and tribes authorized to establish water quality standards under the Clean Water Act (CWA) to protect human health. These are non-enforceable standards based upon exposure by both drinking water and the contribution of water contamination to other consumed foods. Source: U.S. Environmental Protection Agency.<0.01 ppb
One in one million (10-6) Cancer RiskThe concentration of a chemical in drinking water corresponding to an excess estimated lifetime cancer risk of 1 in 1,000,000. Source: U.S. Environmental Protection Agency.<0.01 ppb
California Public Health GoalsDefined by the State of California Office of Environmental Health Hazard Assessment (OEHHA) as the level of contaminant that is allowed in drinking water. For acutely toxic substances, levels are set at which scientific evidence indicates that no known or anticipated adverse effects on health will occur, plus an adequate margin-of safety. PHGs for carcinogens or other substances which can cause chronic disease shall be based solely on health effects without regard to cost impacts and shall be set at levels which OEHHA has determined do not pose any significant risk to health.<0.01 ppb
Maximum Contaminant Limit (MCL)The enforceable standard which defines the highest level of a contaminant that is allowed in drinking water. MCLs are set as close to health-based limits (Maximum Contaminant Level Goals, or MCLGs) as feasible using the best available analytical and treatment technologies and taking cost into consideration. Source: U.S. Environmental Protection Agency.0.2 ppb
One in ten thousand (10-4) Cancer RiskThe concentration of a chemical in drinking water corresponding to an excess estimated lifetime cancer risk of 1 in 10,000. Source: U.S. Environmental Protection Agency.0.4 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.0.4 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.10 ppb

Violation Summary for Heptachlor epoxide in Illinois

Data from the U.S. Environmental Protection Agency includes the following violations of federal standards in Illinois since 2004

Violation TypeNumber of Violations
Failure to monitor regularly26