Know Your Environment. Protect Your Health.

Hexachlorocyclopentadiene

City of Shavano Park

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.

 

15

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND10ND
2019ND30ND
2020ND20ND
2021ND10ND
2022ND50ND
2023ND30ND

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
2018-03-02AE16783ND
2019-04-03AE61106ND
2019-04-03AE61107ND
2019-04-03AE61108ND
2020-02-24AE99608ND
2020-05-15AF11951ND
2021-02-23AF44017ND
2022-03-09AF88498ND
2022-03-09AF88499ND
2022-03-09AF88501ND
2022-06-21AG01786ND
2022-09-27AG15096ND
2023-03-16AG33423ND
2023-06-22AG45704ND
2023-06-22AG45705ND