Know Your Environment. Protect Your Health.

Hexachlorocyclopentadiene

Quint-mar Water Authority

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.

 

24

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
2019ND100ND
2020ND20ND
2021N/A00N/A
2022ND100ND
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
2019-02-05AB32809ND
2019-02-05AB32810ND
2019-02-05AB32811ND
2019-02-05AB32808ND
2019-04-17AB34287ND
2019-07-17AB36908-1ND
2019-07-17AB36909ND
2019-07-17AB36910ND
2019-07-17AB36911ND
2019-07-17AB36912ND
2020-07-20AB43481ND
2020-11-05AB46358ND
2022-02-08AB56151ND
2022-02-08AB56155ND
2022-02-08AB56154ND
2022-02-08AB56153ND
2022-02-08AB56152ND
2022-07-20AB60396ND
2022-07-20AB60397ND
2022-07-20AB60398ND
2022-07-20AB60399ND
2022-07-20AB60400ND
2023-02-06AB65254ND
2023-07-17AB69865ND