Know Your Environment. Protect Your Health.

Heptachlor

City of Richwood

NOTE: City of Richwood purchases water from Brazosport Water Authority which is required to test for heptachlor. Sample information shown below was taken by Brazosport Water Authority.

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
2018ND20ND
2019ND40ND
2020ND20ND
2021ND10ND
2022ND30ND
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: City of Richwood purchases water from Brazosport Water Authority which is required to test for heptachlor. Sample information shown below was taken by Brazosport Water Authority.

Date Lab ID Result
2018-01-22AE09699ND
2019-02-07AE53613ND
2020-03-17AF03387ND
2021-01-21AF40456ND
2022-01-24AF81428ND
2023-05-15AG40595ND