Heptachlor

Zachary Water System

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

MORE ABOUT THIS CONTAMINANT

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Range of results
2014	N/A	0	N/A
2015	N/A	0	N/A
2016	ND	10	ND
2017	N/A	0	N/A
2018	ND	2	ND
2019	ND	16	ND

ppb = parts per billion

State and national drinking water standards and health guidelines

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
2016-01-12	35225030003	ND
2016-01-12	35225030003	ND
2016-07-26	35256952002	ND
2016-07-26	35256952001	ND
2016-07-26	35256952002	ND
2016-07-26	35256952004	ND
2016-07-26	35256952003	ND
2016-07-26	35256952001	ND
2016-07-26	35256952003	ND
2016-07-26	35256952004	ND
2018-11-26	35433146001	ND
2018-11-26	35433146001	ND
2019-06-18	35476846004	ND
2019-06-18	35476846003	ND
2019-06-18	35476846002	ND
2019-06-18	35476846001	ND
2019-06-18	35476846004	ND
2019-06-18	35476846001	ND
2019-06-18	35476846002	ND
2019-06-18	35476846003	ND
2019-07-23	35484677001	ND
2019-07-23	35484677004	ND
2019-07-23	35484677003	ND
2019-07-23	35484677002	ND
2019-07-23	35484677001	ND
2019-07-23	35484677004	ND
2019-07-23	35484677003	ND
2019-07-23	35484677002	ND