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EWG's Tap Water Database — 2019 UPDATE

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Heptachlor epoxide

City of Angleton

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

 

15

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND40ND
2013ND20ND
2014ND20ND
2015ND20ND
2016ND20ND
2017ND30ND

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
2012-01-03AB76892ND
2012-01-03AB76891ND
2012-04-03AB85871ND
2012-07-09AB94723ND
2013-01-29AC09037ND
2013-01-29AC09038ND
2014-02-25AC44579ND
2014-02-25AC44576ND
2015-01-15AC76582ND
2015-01-15AC76579ND
2016-01-20AD19059ND
2016-01-20AD19065ND
2017-01-12AD64880ND
2017-01-12AD64879ND
2017-03-28AD77287ND