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EWG's Tap Water Database — 2019 UPDATE

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Heptachlor

City of Kerrville

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

 

27

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND50ND
2013ND30ND
2014ND20ND
2015ND50ND
2016ND30ND
2017ND90ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.008 ppb

The EWG 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.

EPA Maximum Contaminant
Level (MCL) 0.4 ppb

The legal limit for heptachlor, 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 due to heptachlor exposure.

ppb = parts per billion

All test results

Date Lab ID Result
2012-01-181201425003ND
2012-04-041204117004ND
2012-04-041204117003ND
2012-07-251207951004ND
2012-10-041210228004ND
2013-01-23AC08576ND
2013-04-11AC16513ND
2013-07-29AC26123ND
2014-02-10AC42045ND
2014-10-15AC69763ND
2015-01-28AC78283ND
2015-01-28AC78284ND
2015-04-15AC88477ND
2015-08-14AD04451ND
2015-08-14AD04452ND
2016-02-01AD21266ND
2016-02-01AD21273ND
2016-10-24AD54448ND
2017-02-13AD70497ND
2017-05-08AD83181ND
2017-05-09AD83439ND
2017-05-09AD83440ND
2017-07-05AD88368ND
2017-07-05AD88369ND
2017-07-05AD88367ND
2017-10-09AD99914ND
2017-10-09AD99915ND