trans-1,2-Dichloroethylene

Hudson Water Supply

1,2-Dichloroethylene, a neurotoxic solvent, exists in two different forms: trans-1,2-dichloroethylene and cis-1,2-dichloroethylene. A mixture of the two forms is used to manufacture other solvents and chemical products.

MORE ABOUT THIS CONTAMINANT

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Range of results
2014	ND	6	ND
2015	ND	7	ND
2016	ND	6	ND
2017	ND	5	ND
2018	ND	6	ND
2019	ND	7	ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 60 ppb

The EWG Health Guideline of 60 ppb for trans-1,2-dichloroethylene 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 internal organs.

EPA Maximum Contaminant
Level (MCL) 100 ppb

The legal limit for trans-1,2-dichloroethylene, established in 1991, was based on a toxicity study in laboratory animals conducted in the 1980s.

ppb = parts per billion

All test results

Date	Result
2014-06-10	ND
2014-06-10	ND
2014-06-10	ND
2014-06-10	ND
2014-06-10	ND
2014-06-10	ND
2015-06-09	ND
2015-06-09	ND
2015-06-09	ND
2015-06-09	ND
2015-06-09	ND
2015-06-09	ND
2015-06-09	ND
2016-06-14	ND
2016-06-14	ND
2016-06-14	ND
2016-06-14	ND
2016-06-14	ND
2016-06-14	ND
2017-06-20	ND
2017-06-20	ND
2017-06-20	ND
2017-06-20	ND
2017-06-20	ND
2018-06-12	ND
2018-06-12	ND
2018-06-12	ND
2018-06-12	ND
2018-06-12	ND
2018-06-12	ND
2019-04-16	ND
2019-04-16	ND
2019-04-16	ND
2019-04-16	ND
2019-04-16	ND
2019-07-19	ND
2019-09-25	ND