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EWG's Tap Water Database — 2021 UPDATE

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Heptachlor epoxide

Quint-mar Water Authority

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

MORE ABOUT THIS CONTAMINANT

 

27

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND20ND
2015N/A00N/A
2016ND100ND
2017ND20ND
2018N/A00N/A
2019ND130ND

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
2014-02-13AA88468ND
2014-07-29AA90730ND
2016-06-14AB12481ND
2016-06-14AB12485ND
2016-06-14AB12483ND
2016-06-14AB12482ND
2016-06-14AB12484ND
2016-07-20AB13722ND
2016-07-20AB13718ND
2016-07-20AB13720ND
2016-07-20AB13719ND
2016-07-20AB13721ND
2017-01-26AB17479ND
2017-07-13AB21022ND
2019-02-05AB32811ND
2019-02-05AB32810ND
2019-02-05AB32809ND
2019-02-05AB32807ND
2019-02-05AB32808ND
2019-04-17AB34288ND
2019-04-17AB34287ND
2019-07-17AB36908-1ND
2019-07-17AB36912ND
2019-07-17AB36911ND
2019-07-17AB36910ND
2019-07-17AB36909ND
2019-07-17AB36917ND