Know Your Environment. Protect Your Health.

Heptachlor

Hollands Quarter Water Supply Corporation

NOTE: Hollands Quarter Water Supply Corporation purchases water from City of Carthage which is required to test for heptachlor. Sample information shown below was taken by City of Carthage.

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

 

6

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

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

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: Hollands Quarter Water Supply Corporation purchases water from City of Carthage which is required to test for heptachlor. Sample information shown below was taken by City of Carthage.

Date Lab ID Result
2018-02-14Q1806322001ND
2019-02-05Q1905209002ND
2020-03-11Q2010299001ND
2021-02-24Q2104964001ND
2022-01-26Q2202696001ND
2023-02-13Q2305514002ND