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EWG's Tap Water Database — 2019 UPDATE

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Heptachlor epoxide

Philadelphia Water Department

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

 

21

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND30ND
2013N/A00N/A
2014ND60ND
2015ND30ND
2016ND30ND
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 Lab ID Result
2012-04-026604134ND
2012-04-026604132ND
2012-04-026604133ND
2014-04-077422122ND
2014-04-077422120ND
2014-04-077422118ND
2014-08-197572176ND
2014-08-197572174ND
2014-08-197572178ND
2015-06-1012888346ND
2015-06-1012888322ND
2015-06-1012888370ND
2016-06-0314411776ND
2016-06-0314411751ND
2016-06-0314411726ND
2017-05-1616101005ND
2017-05-1616100980ND
2017-05-1616100955ND
2017-07-2416420643ND
2017-07-2416420618ND
2017-07-2416420593ND