cis-1,2-Dichloroethylene

United Wappinger Water Improvement District

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.

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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	8	ND
2015	N/A	0	N/A
2016	ND	8	ND
2017	ND	5	ND
2018	ND	3	ND
2019	ND	9	ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EPA Maximum Contaminant
Level (MCL) 70 ppb

The legal limit for cis-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	Lab ID	Result
2014-12-09	12101427K	ND
2014-12-09	12101426P	ND
2014-12-09	12101427F	ND
2014-12-09	12101426G	ND
2014-12-09	12101427R	ND
2014-12-09	12101426K	ND
2014-12-09	12101426V	ND
2014-12-09	12101426H	ND
2016-11-29	UW164137	ND
2016-11-29	UW164139	ND
2016-11-29	UW164145	ND
2016-11-29	UW164143	ND
2016-11-30	UW164251F	ND
2016-11-30	UW164254F	ND
2016-11-30	UW164253F	ND
2016-11-30	UW164252F	ND
2017-11-28	UW172961F	ND
2017-11-28	UW172962F	ND
2017-11-28	UW172958F	ND
2017-11-28	UW172959F	ND
2017-11-28	UW172963F	ND
2018-01-03	UW180048F	ND
2018-12-11	18L0513-05F	ND
2018-12-12	18L0588-01F	ND
2019-09-03	UW192172F	ND
2019-09-03	UW192173-F	ND
2019-12-09	19L0336-03	ND
2019-12-09	19L0336-01F	ND
2019-12-09	19L0336-04	ND
2019-12-09	19L0336-02	ND
2019-12-09	19L0336-05	ND
2019-12-11	19L0468-02F	ND
2019-12-11	19L0468-01F	ND