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EWG's Tap Water Database — 2021 UPDATE

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Heptachlor epoxide

Valencia Water Company

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

 

16

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND80ND
2015N/A00N/A
2016N/A00N/A
2017ND80ND
2018N/A00N/A
2019N/A00N/A

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
2014-03-059590-062-1045ND
2014-03-129590-052-0850ND
2014-03-269590-003-1000ND
2014-03-269590-073-0820ND
2014-06-049590-052-1000ND
2014-06-049590-062-0900ND
2014-06-259590-003-1030ND
2014-06-259590-073-0820ND
2017-03-029590-052-0950ND
2017-03-029590-062-0907ND
2017-03-239590-003-0805ND
2017-03-239590-073-0907ND
2017-06-019590-052-0855ND
2017-06-019590-062-0930ND
2017-06-229590-003-0850ND
2017-06-229590-073-0950ND