Know Your Environment. Protect Your Health.

Heptachlor

Western Cass Water Supply Corporation

Heptachlor is an insecticide used for termite control until 1988. It is linked to cancer, hormone disruption and neurotoxicity.

 

19

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND50ND
2019ND10ND
2020ND50ND
2021ND50ND
2022ND10ND
2023ND20ND

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 0.008 ppb

The EWG Health Guideline of 0.008 ppb for heptachlor 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): 0.4 ppb

The legal limit for heptachlor, 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 due to heptachlor exposure.

ppb = parts per billion

All test results

Date Lab ID Result
2018-03-08Q1809687012ND
2018-03-08Q1809687013ND
2018-03-08Q1809687014ND
2018-03-08Q1809687015ND
2018-03-08Q1809687011ND
2019-05-02Q1918236011ND
2020-03-19Q2011997015ND
2020-04-21Q2015767019ND
2020-04-21Q2015767038ND
2020-07-28Q2029440007ND
2020-12-03Q2048488001ND
2021-10-25Q2129911001ND
2021-10-25Q2129911002ND
2021-10-25Q2129911003ND
2021-10-25Q2129911004ND
2021-10-25Q2129911005ND
2022-11-16Q2234548003ND
2023-08-01Q2331111001ND
2023-08-01Q2331111010ND