Know Your Environment. Protect Your Health.

Heptachlor epoxide

Mustang Valley Water Supply Corporation

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

 

10

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018N/A00N/A
2019ND50ND
2020N/A00N/A
2021N/A00N/A
2022ND50ND
2023N/A00N/A

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

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
2019-03-13Q1910654003ND
2019-03-13Q1910654007ND
2019-03-13Q1910654011ND
2019-03-13Q1910654015ND
2019-09-11Q1964031001ND
2022-10-12Q2230979001ND
2022-10-12Q2230979004ND
2022-10-12Q2230979005ND
2022-10-12Q2230979006ND
2022-10-12Q2230979007ND