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EWG's Tap Water Database — 2019 UPDATE

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Hexachlorocyclopentadiene

Johnson Utilities

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.

 

12

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND60ND
2013N/A00N/A
2014N/A00N/A
2015ND40ND
2016ND20ND
2017N/A00N/A

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
2012-01-23201201240163SAND
2012-01-23201201240163SBND
2012-01-23201201240163SCND
2012-07-26201207270233SAND
2012-07-26201207270233SBND
2012-07-26201207270233SCND
2015-03-04201503040395SAND
2015-03-04201503040395SBND
2015-06-17201506170582SAND
2015-06-17201506170582SBND
2016-02-17201602180080SND
2016-10-27201610270264SND