Know Your Environment. Protect Your Health.

Hexachlorocyclopentadiene

Crowley Water System (LAWCO)

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.

 

18

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND80ND
2019N/A00N/A
2020ND50ND
2021N/A00N/A
2022N/A00N/A
2023ND50ND

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

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
2018-07-3035407885002ND
2018-07-3035407885003ND
2018-07-3035407885004ND
2018-07-3035407885001ND
2018-07-3035407885002ND
2018-07-3035407885003ND
2018-07-3035407885004ND
2018-07-3035407885001ND
2020-12-1435599407002ND
2020-12-1435599407005ND
2020-12-1435599407004ND
2020-12-1435599407003ND
2020-12-1435599407001ND
2023-10-0335832383001ND
2023-10-0335832383002ND
2023-10-0335832383003ND
2023-10-0335832383004ND
2023-10-0335832383005ND