Know Your Environment. Protect Your Health.

Heptachlor

Williamston, Town of

NOTE: Williamston, Town of purchases water from Martin County Regional WASA which is required to test for heptachlor. Sample information shown below was taken by Martin County Regional WASA.

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

 

4

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
2019N/A00N/A
2020ND80ND
2021N/A00N/A
2022N/A00N/A
2023ND90ND

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

NOTE: Williamston, Town of purchases water from Martin County Regional WASA which is required to test for heptachlor. Sample information shown below was taken by Martin County Regional WASA.

Date Lab ID Result
2020-01-087442-010820-E01SND
2020-04-0137729_20-13712ND
2023-01-037451-010323-E01SND
2023-04-057451-040523-E01SND