Know Your Environment. Protect Your Health.

Heptachlor epoxide

Quail Ridge Estates Water System

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
2018ND20ND
2019ND60ND
2020ND10ND
2021N/A00N/A
2022ND30ND
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
2018-12-0535435399001ND
2018-12-0535435399001ND
2019-02-0435446720001ND
2019-02-0435446720002ND
2019-02-0435446720001ND
2019-02-0435446720002ND
2019-12-1835520216001ND
2019-12-1835520216001ND
2020-08-1135570279001ND
2022-02-0735695811001ND
2022-02-0735695811002ND
2022-02-0735695811003ND