Know Your Environment. Protect Your Health.

Heptachlor

St John Water District 1

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

 

15

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND40ND
2019ND40ND
2020ND10ND
2021ND20ND
2022ND20ND
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
2018-05-1435392327001ND
2018-05-1435392327001ND
2018-07-1735405084001ND
2018-07-1735405084001ND
2019-01-2235444040001ND
2019-01-2235444040001ND
2019-07-2535485228001ND
2019-07-2535485228001ND
2020-10-2235587106001ND
2021-01-2835608068001ND
2021-11-1835679380001ND
2022-02-0235694871001ND
2022-09-1535747517001ND
2023-03-2035787603001ND
2023-11-2835844327001ND