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EWG's Tap Water Database — 2021 UPDATE

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Hexachlorocyclopentadiene

City of Watsonville

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.

MORE ABOUT THIS CONTAMINANT

 

28

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014N/A00N/A
2015N/A00N/A
2016ND280ND
2017N/A00N/A
2018N/A00N/A
2019N/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
2016-03-159590-016-1120ND
2016-03-159590-014-1120ND
2016-03-159590-013-0915ND
2016-03-159590-012-1015ND
2016-03-159590-015-1050ND
2016-03-159590-011-1205ND
2016-03-159590-010-0950ND
2016-03-159590-009-1015ND
2016-03-159590-007-1145ND
2016-03-159590-029-1050ND
2016-03-159590-006-0930ND
2016-03-159590-030-0830ND
2016-06-149590-016-1020ND
2016-06-149590-030-1020ND
2016-06-149590-015-1300ND
2016-06-149590-029-1000ND
2016-06-149590-014-0850ND
2016-06-149590-004-1210ND
2016-06-149590-013-0840ND
2016-06-149590-012-1220ND
2016-06-149590-011-1315ND
2016-06-149590-010-0950ND
2016-06-149590-009-1050ND
2016-06-149590-007-1045ND
2016-06-149590-006-0910ND
2016-06-209590-005-1510ND
2016-09-139590-005-1440ND
2016-09-139590-004-1400ND