Heptachlor

Town of Ferriday 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	ND	4	ND
2015	ND	6	ND
2016	ND	8	ND
2017	N/A	0	N/A
2018	N/A	0	N/A
2019	ND	8	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
2014-03-17	AD89796	ND
2014-03-17	AD89796	ND
2014-12-01	AE00149	ND
2014-12-01	AE00149	ND
2015-07-13	35197766003	ND
2015-07-13	35197766003	ND
2015-08-17	35203233006	ND
2015-08-17	35203233006	ND
2015-09-16	35208078002	ND
2015-09-16	35208078002	ND
2016-10-13	35270878004	ND
2016-10-13	35270878003	ND
2016-10-13	35270878002	ND
2016-10-13	35270878001	ND
2016-10-13	35270878004	ND
2016-10-13	35270878003	ND
2016-10-13	35270878001	ND
2016-10-13	35270878002	ND
2019-08-15	35491138001	ND
2019-08-15	35491138004	ND
2019-08-15	35491138003	ND
2019-08-15	35491138002	ND
2019-08-15	35491138001	ND
2019-08-15	35491138004	ND
2019-08-15	35491138003	ND
2019-08-15	35491138002	ND