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EWG's Tap Water Database — 2019 UPDATE

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Hexachlorocyclopentadiene

City of Gilroy

Hexachlorocyclopentadiene was historically used for the manufacture of currently banned pesticides, such as endrin, dieldrin and chlordane. Its still used for production of flame retardants, resins and plastics.

 

28

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND180ND
2013N/A00N/A
2014N/A00N/A
2015ND100ND
2016N/A00N/A
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
2012-05-215810-004-1045ND
2012-05-215810-002-1135ND
2012-05-215810-001-0850ND
2012-05-215810-006-1315ND
2012-05-225810-007-0745ND
2012-05-225810-008-0955ND
2012-05-225810-009-1035ND
2012-05-225810-010-1115ND
2012-05-225810-011-0835ND
2012-08-225810-008-1050ND
2012-08-225810-006-1325ND
2012-08-225810-009-1110ND
2012-08-225810-004-1000ND
2012-08-225810-011-1300ND
2012-08-225810-002-1025ND
2012-08-225810-001-0845ND
2012-08-235810-010-0855ND
2012-08-235810-007-0825ND
2015-05-205810-006-0945ND
2015-05-205810-007-1300ND
2015-05-205810-008-1025ND
2015-05-205810-009-1100ND
2015-05-205810-010-0810ND
2015-05-215810-011-0955ND
2015-05-215810-004-1250ND
2015-05-215810-002-1010ND
2015-05-215810-001-0800ND
2015-08-205810-011-0845ND