Hexachlorocyclopentadiene

Pointe A La Hache Water System

Hexachlorocyclopentadiene was historically used for the manufacture of currently banned pesticides, such as endrin, dieldrin and chlordane. It’s still used for production of flame retardants, resins and plastics.

MORE ABOUT THIS CONTAMINANT

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2014	ND	4	0	ND
2015	ND	4	0	ND
2016	ND	4	0	ND
2017	0.0520 ppb	2	2	0.0520 ppb
2018	0.0185 ppb	4	2	ND - 0.0370 ppb
2019	0.0115 ppb	4	2	ND - 0.0230 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 2 ppb

The EWG Health Guideline of 2 ppb for hexachlorocyclopentadiene 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 harm to the stomach and intestines.

EPA Maximum Contaminant
Level (MCL) 50 ppb

The legal limit for hexachlorocyclopentadiene, established in 1992, was based on a toxicity study in laboratory animals conducted in the 1980s.

ppb = parts per billion

All test results

Date	Lab ID	Result
2014-01-21	AD88467	ND
2014-01-21	AD88467	ND
2014-10-23	AD98834	ND
2014-10-23	AD98834	ND
2015-03-30	35181567004	ND
2015-03-30	35181567004	ND
2015-10-06	35211176006	ND
2015-10-06	35211176006	ND
2016-02-17	35230188002	ND
2016-02-17	35230188002	ND
2016-12-08	35282294004	ND
2016-12-08	35282294004	ND
2017-02-16	35296025004	0.0520 ppb
2017-02-16	35296025004	0.0520 ppb
2018-03-06	35378294001	ND
2018-03-06	35378294001	ND
2018-09-24	35419981001	0.0370 ppb
2018-09-24	35419981001	0.0370 ppb
2019-02-14	35448746001	0.0230 ppb
2019-02-14	35448746001	0.0230 ppb
2019-09-24	35500297001	ND
2019-09-24	35500297001	ND