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EWG's Tap Water Database — 2021 UPDATE

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Heptachlor epoxide

Oxnard Water Department

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

MORE ABOUT THIS CONTAMINANT

 

29

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND10ND
2015N/A00N/A
2016ND60ND
2017ND50ND
2018ND40ND
2019ND130ND

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
2014-11-199588-037-1021ND
2016-03-039588-020-0000ND
2016-03-039588-039-0907ND
2016-03-179588-035-0917ND
2016-03-179588-038-1007ND
2016-03-229588-041-0943ND
2016-03-229588-040-0855ND
2017-07-199588-037-0847ND
2017-08-099588-057-1020ND
2017-08-099588-060-0850ND
2017-08-169588-063-1005ND
2017-08-169588-059-1055ND
2018-11-149588-060-0934ND
2018-11-149588-057-1020ND
2018-11-219588-063-0944ND
2018-11-289588-059-1056ND
2019-04-179588-020-0929ND
2019-04-179588-018-0810ND
2019-04-179588-041-1040ND
2019-04-249588-039-1134ND
2019-05-019588-036-1044ND
2019-05-159588-040-1130ND
2019-06-199588-035-1028ND
2019-06-269588-038-1002ND
2019-07-179588-021-1247ND
2019-09-189588-059-1107ND
2019-10-029588-063-1222ND
2019-10-169588-057-1112ND
2019-11-209588-057-1124ND