Know Your Environment. Protect Your Health.

Hexachlorocyclopentadiene

Cypress Springs Special Utility District South Plant

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.

 

10

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND10ND
2019ND10ND
2020ND10ND
20210.0250 ppb41ND - 0.1000 ppb
2022ND20ND
2023ND10ND

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
2018-02-21Q1807255004ND
2019-03-04Q1909015001ND
2020-02-12Q2005742001ND
2021-03-23Q2107391001ND
2021-06-16Q21158190010.1000 ppb
2021-09-27Q2126244001ND
2021-12-15Q2135536001ND
2022-03-23AF91425ND
2022-06-20Q2216953001ND
2023-02-22Q2307425001ND