cis-1,2-Dichloroethylene

East Hempfield Water Authority

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	7	ND
2015	ND	4	ND
2016	ND	4	ND
2017	ND	13	ND
2018	ND	5	ND
2019	ND	4	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
2014-09-30	14032956-01	ND
2014-09-30	14032956-02	ND
2014-09-30	14032956-03	ND
2014-09-30	14032956-04	ND
2014-12-29	14122146-01	ND
2014-12-29	14122146-02	ND
2014-12-29	14122146-03	ND
2015-09-15	13360703	ND
2015-09-15	13360724	ND
2015-09-15	13360682	ND
2015-09-15	13360745	ND
2016-12-27	15481330	ND
2016-12-27	15481309	ND
2016-12-27	15481351	ND
2016-12-27	15481288	ND
2017-03-16	15901253	ND
2017-03-16	15901274	ND
2017-03-16	15901502	ND
2017-03-16	15901295	ND
2017-03-16	15901232	ND
2017-05-23	16218710	ND
2017-05-23	16218731	ND
2017-05-23	16218461	ND
2017-05-23	16218440	ND
2017-08-30	16844196	ND
2017-08-30	16844217	ND
2017-11-15	17129198	ND
2017-11-15	17129177	ND
2018-02-28	7104860-01	ND
2018-06-06	8044976-01	ND
2018-06-06	8044976-02	ND
2018-06-06	8044976-03	ND
2018-11-19	8015122-01	ND
2019-05-20	9045072-01	ND
2019-05-20	9045072-02	ND
2019-05-20	9045072-03	ND
2019-08-21	9085002-03	ND