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EWG's Tap Water Database — 2021 UPDATE

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Heptachlor epoxide

Old Westbury

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

 

30

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND60ND
2015ND40ND
2016ND60ND
2017ND60ND
2018ND50ND
2019ND30ND

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
2014-08-211408F45-001-SOCSND
2014-08-211408F45-002-SOCSND
2014-08-281408K29-001-SOCSND
2014-08-281408K29-002-SOCSND
2014-09-031409142-001-SOCSND
2014-09-041409265-001-SOCSND
2015-08-241508H96-001-SOCSND
2015-08-271508L20-001-SOCSND
2015-09-081509464-001-SOCSND
2015-09-211509F35-001-SOCSND
2016-09-121609802-001-SOCSND
2016-09-121609802-002-SOCSND
2016-09-191609E95-002-SOCSND
2016-09-191609E95-001-SOCSND
2016-09-231609M52-001-SOCSND
2016-09-231609L03-001-SOCSND
2017-10-127032670001ND
2017-11-287035780001ND
2017-11-287036593001ND
2017-12-057037131001ND
2017-12-057037127001ND
2017-12-117037758001ND
2018-11-137070937001ND
2018-11-147071092001ND
2018-12-057072990001ND
2018-12-127073710001ND
2018-12-177074135001ND
2019-08-2870103045002ND
2019-08-2870103045001ND
2019-09-1770105239001ND