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EWG's Tap Water Database — 2019 UPDATE

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Heptachlor epoxide

Beverly Hills / Rolling Oaks Subdivision

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

 

22

Samples

0

Samples exceeding legal limit (MCL)

3

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.00690 ppb110.00690 ppb
20130.0170 ppb110.0170 ppb
20140.00244 ppb91ND - 0.0220 ppb
2015ND10ND
20160.00570 ppb110.00570 ppb
2017ND90ND

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 Result
2012-05-240.00690 ppb
2013-09-150.0170 ppb
2014-05-140.0220 ppb
2014-05-14ND
2014-05-14ND
2014-05-14ND
2014-05-14ND
2014-05-14ND
2014-05-14ND
2014-05-15ND
2014-05-15ND
2015-06-11ND
2016-05-050.00570 ppb
2017-05-03ND
2017-05-03ND
2017-05-03ND
2017-05-03ND
2017-05-03ND
2017-05-03ND
2017-05-03ND
2017-05-04ND
2017-05-04ND