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EWG's Tap Water Database — 2021 UPDATE

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Hexachlorocyclopentadiene

Freedom District

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
2014ND40ND
2015ND30ND
2016ND20ND
2017ND30ND
2018ND30ND
2019ND10ND

ppb = parts per billion

State and national drinking water standards and health guidelines

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
2014-01-270060002_01_10690ND
2014-04-210060002_01_20027ND
2014-08-060060002_01_00054ND
2014-08-060060002_02_00054ND
2015-04-132064721001ND
2015-08-31E16000844001ND
2015-09-142095566002BND
2016-05-092142346001_AND
2016-08-082165404001ND
2017-05-31E17004689001ND
2017-05-31E17004692001ND
2017-08-142253973001_A_BND
2018-04-3018E0196_01ND
2018-05-14E18004109003ND
2018-12-1018L0652ND
2019-05-153034245ND