Know Your Environment. Protect Your Health.

Heptachlor

Westwood Shores Municipal Utility District

NOTE: Westwood Shores Municipal Utility District purchases water from Trinity Rural Water Supply Corporation 1 which is required to test for heptachlor. Sample information shown below was taken by Trinity Rural Water Supply Corporation 1.

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
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

NOTE: Westwood Shores Municipal Utility District purchases water from Trinity Rural Water Supply Corporation 1 which is required to test for heptachlor. Sample information shown below was taken by Trinity Rural Water Supply Corporation 1.

Date Lab ID Result
2018-02-14Q1806541006ND
2019-03-14Q1910847001ND
2020-11-03Q2042584003ND
2021-02-11Q2104195001ND
2022-03-02Q2207194001ND
2023-02-08Q2304961009ND