Know Your Environment. Protect Your Health.

Heptachlor

Mansfield Water System

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

 

16

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND40ND
2019ND40ND
2020ND20ND
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
2018-04-1935387645001ND
2018-04-1935387645001ND
2018-08-0635409597001ND
2018-08-0635409597001ND
2019-03-1335454725001ND
2019-03-1335454725001ND
2019-08-0135486698001ND
2019-08-0135486698001ND
2020-02-0335528231001ND
2020-09-2235579680001ND
2021-03-0335616824004ND
2021-08-1735657244001ND
2022-02-2235699238003ND
2022-08-2235742155002ND
2023-02-0735778295005ND
2023-08-2135823285001ND