Know Your Environment. Protect Your Health.

Hexachlorocyclopentadiene

Project 7 Wa

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.

 

8

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND20ND
20190.1000 ppb110.1000 ppb
20200.0510 ppb110.0510 ppb
20210.0275 ppb21ND - 0.0550 ppb
20220.0630 ppb110.0630 ppb
20230.0970 ppb110.0970 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 Result
2018-07-10ND
2018-10-23ND
2019-09-250.1000 ppb
2020-09-080.0510 ppb
2021-09-130.0550 ppb
2021-11-15ND
2022-08-080.0630 ppb
2023-10-090.0970 ppb