Know Your Environment. Protect Your Health.

Hexachlorocyclopentadiene

Myrtle Springs Water Supply Corporation

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.

 

11

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018N/A00N/A
2019ND30ND
2020ND40ND
2021N/A00N/A
2022ND30ND
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
2019-08-26Q1959383008ND
2019-08-26Q1959383009ND
2019-08-26Q1959383010ND
2020-03-23Q2012172005ND
2020-05-21Q2020401003ND
2020-08-12Q2032124021ND
2020-11-20Q2046941003ND
2022-06-09Q2216228009ND
2022-06-09Q2216228010ND
2022-06-09Q2216228011ND
2023-04-19Q2314546002ND