Know Your Environment. Protect Your Health.

Hexachlorocyclopentadiene

Fairview Union Water 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.

 

16

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND40ND
2019ND40ND
2020ND20ND
20210.0500 ppb21ND - 0.1000 ppb
20220.0165 ppb21ND - 0.0330 ppb
20230.0680 ppb220.0520 ppb - 0.0840 ppb

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
2018-01-2235370033001ND
2018-01-2235370033001ND
2018-07-3135408507001ND
2018-07-3135408507001ND
2019-02-2535450972001ND
2019-02-2535450972001ND
2019-08-2635493338001ND
2019-08-2635493338001ND
2020-02-1735531817001ND
2020-09-1735578826001ND
2021-01-1435604986002ND
2021-08-18356572440070.1000 ppb
2022-02-0135694942005ND
2022-08-08357389860030.0330 ppb
2023-03-06357849460010.0840 ppb
2023-08-22358232830010.0520 ppb