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EWG's Tap Water Database — 2019 UPDATE

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Heptachlor epoxide

Pennsylvania American Royersford

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

 

20

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
2013N/A00N/A
2014ND100ND
2015N/A00N/A
2016N/A00N/A
2017ND100ND

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
2014-04-0225339901ND
2014-04-0225340101ND
2014-04-0325339801ND
2014-04-0325340201ND
2014-06-2525340401ND
2014-08-0526516601ND
2014-08-0526516201ND
2014-08-0626516401ND
2014-08-0626516701ND
2014-08-1226516501ND
2017-04-1115931537ND
2017-04-1115931507ND
2017-04-1115931479ND
2017-04-1115931451ND
2017-04-1115931423ND
2017-08-1516560813ND
2017-08-1516560841ND
2017-08-1516560785ND
2017-08-1616560869ND
2017-08-3116721924ND