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EWG's Tap Water Database — 2019 UPDATE

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Heptachlor epoxide

Centennial Water and Sanitation District

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

 

27

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND50ND
2013ND40ND
2014ND20ND
2015ND40ND
2016ND60ND
2017ND60ND

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 Result
2012-03-19ND
2012-08-22ND
2012-08-23ND
2012-10-16ND
2012-10-31ND
2013-03-19ND
2013-03-19ND
2013-06-12ND
2013-08-27ND
2014-07-23ND
2014-07-29ND
2015-05-20ND
2015-07-27ND
2015-08-12ND
2015-08-12ND
2016-05-17ND
2016-07-27ND
2016-07-27ND
2016-08-17ND
2016-10-10ND
2016-10-10ND
2017-01-25ND
2017-01-25ND
2017-06-14ND
2017-08-15ND
2017-08-17ND
2017-08-17ND