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EWG's Tap Water Database

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Heptachlor

Arapahoe Cnty Wwwa

Heptachlor is an insecticide used for termite control until 1988. It is linked to cancer, hormone disruption and neurotoxicity.

 

36

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2010ND140ND
2011ND60ND
2012ND140ND
2013N/A00N/A
2014ND20ND
2015N/A00N/A

ppb = parts per billion.

State and national drinking water standards and health guidelines

Health Guideline 0.008 ppb

The health guideline of 0.008 ppb for heptachlor 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) 0.4 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
2010-01-25ND
2010-01-25ND
2010-01-25ND
2010-02-01ND
2010-02-01ND
2010-04-05ND
2010-04-05ND
2010-04-05ND
2010-04-05ND
2010-04-05ND
2010-04-05ND
2010-07-27ND
2010-07-27ND
2010-12-06ND
2011-01-11ND
2011-01-19ND
2011-04-01ND
2011-04-01ND
2011-08-08ND
2011-08-08ND
2012-01-13ND
2012-01-13ND
2012-01-23ND
2012-01-23ND
2012-04-03ND
2012-04-03ND
2012-04-03ND
2012-04-06ND
2012-04-06ND
2012-04-06ND
2012-04-09ND
2012-07-05ND
2012-07-05ND
2012-07-05ND
2014-11-11ND
2014-11-11ND