Hexachlorocyclopentadiene

Assumption Parish Waterworks District 1

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
2013	N/A	0	0	N/A
2014	ND	8	0	ND
2015	ND	2	0	ND
2016	0.0290 ppb	4	2	ND - 0.0580 ppb
2017	0.0235 ppb	4	2	ND - 0.0470 ppb
2018	0.0320 ppb	2	2	0.0320 ppb
2019	ND	4	0	ND

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
2014-02-03	AD88681	ND
2014-02-03	AD88681	ND
2014-04-14	AD90510	ND
2014-04-14	AD90510	ND
2014-07-21	AD93831	ND
2014-07-21	AD93831	ND
2014-10-06	AD98268	ND
2014-10-06	AD98268	ND
2015-03-31	35181766003	ND
2015-03-31	35181766003	ND
2016-03-15	35234393001	ND
2016-03-15	35234393001	ND
2016-09-19	35266189008	0.0580 ppb
2016-09-19	35266189008	0.0580 ppb
2017-01-31	35292293003	0.0470 ppb
2017-01-31	35292293003	0.0470 ppb
2017-10-16	35342351003	ND
2017-10-16	35342351003	ND
2018-07-23	35406285001	0.0320 ppb
2018-07-23	35406285001	0.0320 ppb
2019-01-29	35445085001	ND
2019-01-29	35445085001	ND
2019-07-24	35484850001	ND
2019-07-24	35484850001	ND