Know Your Environment. Protect Your Health.

Hexachlorocyclopentadiene

Cross Roads Special Utility District

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.

 

14

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND20ND
2019ND10ND
2020ND10ND
20210.0500 ppb63ND - 0.1000 ppb
2022ND20ND
2023ND20ND

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
2018-06-11Q1823067001ND
2018-06-11Q1823067009ND
2019-10-29Q1974604005ND
2020-12-17Q2050079001ND
2021-03-02Q21053080010.1000 ppb
2021-06-24Q21166160010.1000 ppb
2021-09-21Q2125859001ND
2021-11-30Q2133008001ND
2021-11-30Q2133008002ND
2021-11-30Q21330080030.1000 ppb
2022-03-22AF91424ND
2022-03-22AF91428ND
2023-07-20Q2328742003ND
2023-10-16Q2343886005ND