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EWG's Tap Water Database — 2019 UPDATE

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Heptachlor epoxide

Millersview-doole Water Supply Corporation

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

 

8

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
2013ND30ND
2014ND10ND
2015ND20ND
2016ND10ND
2017ND10ND

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
2013-06-26Q1302971009ND
2013-07-22Q1304083005ND
2013-11-14Q1313540003ND
2014-02-27AC45163ND
2015-05-19AC92689ND
2015-05-19AC92697ND
2016-02-17AD24523ND
2017-05-17Q1720172010ND