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EWG's Tap Water Database

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Heptachlor epoxide

Farmington City Water System

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
2010ND120ND
2011ND10ND
2012N/A00N/A
2013ND40ND
2014ND40ND
2015N/A00N/A

ppb = parts per billion.

State and national drinking water standards and health guidelines

Health Guideline 0.006 ppb

The 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.

ppb = parts per billion.

EPA Maximum Contaminant
Level (MCL) 0.2 ppb

The enforceable federal standard that defines the highest level of a contaminant allowed in drinking water.

ppb = parts per billion.

EPA Maximum Contaminant
Level Goal (MCLG)0 ppb

A non-enforceable federal health guideline. For cancer-causing chemicals, these health goals are typically set to zero.

ppb = parts per billion.

All test results

Date Result
2010-09-08ND
2010-09-08ND
2010-09-08ND
2010-09-08ND
2010-09-13ND
2010-09-13ND
2010-12-09ND
2010-12-09ND
2010-12-09ND
2010-12-09ND
2010-12-09ND
2010-12-09ND
2011-03-22ND
2013-11-05ND
2013-11-05ND
2013-11-06ND
2013-11-06ND
2014-03-18ND
2014-06-16ND
2014-09-17ND
2014-12-11ND