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EWG's Tap Water Database — 2021 UPDATE

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Heptachlor epoxide

Town of Greenwood Water System

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
2014ND100ND
2015ND40ND
2016ND40ND
2017ND40ND
2018ND40ND
2019ND40ND

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
2014-04-07AD90461ND
2014-04-07AD90461ND
2014-06-16AD92363ND
2014-06-16AD92364ND
2014-06-16AD92365ND
2014-06-16AD92365ND
2014-06-16AD92364ND
2014-06-16AD92363ND
2014-08-11AD95259ND
2014-08-11AD95259ND
2015-03-2335181011005ND
2015-03-2335181011005ND
2015-10-1935212906005ND
2015-10-1935212906005ND
2016-05-0235242556005ND
2016-05-0235242556005ND
2016-12-0835282332006ND
2016-12-0835282332006ND
2017-04-1735307223003ND
2017-04-1735307223003ND
2017-10-0435341216002ND
2017-10-0435341216002ND
2018-01-0835367517001ND
2018-01-0835367517001ND
2018-07-2335407298001ND
2018-07-2335407298001ND
2019-02-2135449632001ND
2019-02-2135449632001ND
2019-07-2535485235001ND
2019-07-2535485235001ND