Know Your Environment. Protect Your Health.

Hexachlorocyclopentadiene

Pendleton Water Association

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.

 

14

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND20ND
2019ND40ND
2020ND20ND
20210.0165 ppb21ND - 0.0330 ppb
20220.0150 ppb21ND - 0.0300 ppb
20230.0800 ppb21ND - 0.160 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
2018-08-0635409599001ND
2018-08-0635409599001ND
2019-03-1235454721001ND
2019-03-1235454721001ND
2019-08-0735490078001ND
2019-08-0735490078001ND
2020-02-1035529911001ND
2020-09-2235579669001ND
2021-01-2035606276002ND
2021-08-18356572440050.0330 ppb
2022-02-2135699244001ND
2022-08-29357438580020.0300 ppb
2023-02-2735782747002ND
2023-08-07358196710010.160 ppb