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EWG's Tap Water Database — 2019 UPDATE

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Heptachlor epoxide

Nueces County WCID 3

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

 

12

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND10ND
2013ND30ND
2014ND20ND
2015ND40ND
2016ND10ND
2017ND10ND

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
2012-01-261201643003ND
2013-02-12AC10493ND
2013-08-06AC26993ND
2013-12-16AC37696ND
2014-02-05AC41642ND
2014-05-22AC55083ND
2015-02-19AC81306ND
2015-04-23AC89491ND
2015-09-17AD07650ND
2015-12-02AD15252ND
2016-02-11AD23471ND
2017-03-21AD76161ND