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EWG's Tap Water Database — 2021 UPDATE

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Heptachlor epoxide

Clearbrooke Estates Pump District

Heptachlor epoxide is a breakdown product of heptachlor, a highly toxic and carcinogenic pesticide banned in the U.S. since the 1980s.

 

12

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND10ND
2015N/A00N/A
2016N/A00N/A
2017ND40ND
2018ND30ND
2019ND40ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.006 ppb

The EWG Health Guideline of 0.006 ppb for heptachlor epoxide was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.

EPA Maximum Contaminant
Level (MCL) 0.2 ppb

The legal limit for heptachlor epoxide, established in 1991, was based on analytical detection limits at the time that the standard was set. This limit may not fully protect against the risk of cancer.

ppb = parts per billion

All test results

Date Lab ID Result
2014-04-2235135575005ND
2017-04-202224520003ND
2017-04-202224520004ND
2017-09-262265847001ND
2017-11-142277506001ND
2018-01-232291329001ND
2018-04-042307423001ND
2018-10-034079413ND
2019-01-224180616ND
2019-03-084221691ND
2019-04-244271516ND
2019-08-204395306ND