Know Your Environment. Protect Your Health.

Hexachlorocyclopentadiene

Connecticut Water Company - Northern Region-Western 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.

 

22

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND30ND
2019ND20ND
2020N/A00N/A
2021N/A00N/A
2022ND160ND
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
2018-01-31BZ82950SOC5ND
2018-06-28CA80715SOC5ND
2018-07-26CA99050ND
2019-01-09SOC 200518249ND
2019-03-11SOC 200524185ND
2022-01-31CK26558ND
2022-02-01CK27434ND
2022-02-28CK76167ND
2022-04-18CL11075ND
2022-08-26CM16197ND
2022-08-26CM16200ND
2022-09-07CM25593ND
2022-09-08CM25670ND
2022-09-20CM37292ND
2022-09-20CM37296ND
2022-10-04CM49624ND
2022-10-04CM49621ND
2022-10-06CM51510ND
2022-10-06CM51504ND
2022-10-06CM50872ND
2022-11-03CM76536ND
2023-01-18CN25096ND