cis-1,2-Dichloroethylene

Pennsylvania American Royersford

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	9	ND
2015	ND	10	ND
2016	ND	4	ND
2017	ND	5	ND
2018	ND	4	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
2014-04-02	25340001	ND
2014-04-02	25341501	ND
2014-04-03	25340301	ND
2014-04-03	25340801	ND
2014-06-25	25340501	ND
2014-08-06	26818001	ND
2014-08-06	26818101	ND
2014-10-06	27103901	ND
2014-10-06	27104001	ND
2015-01-08	12283045	ND
2015-01-08	12283024	ND
2015-04-09	12628865	ND
2015-04-09	12628930	ND
2015-04-09	12628886	ND
2015-04-09	12628907	ND
2015-07-13	13008746	ND
2015-09-16	13260272	ND
2015-10-06	13385312	ND
2015-10-06	13385333	ND
2016-04-05	14097848	ND
2016-04-05	14097869	ND
2016-04-05	14097827	ND
2016-04-05	14097892	ND
2017-04-11	15931660	ND
2017-04-11	15931616	ND
2017-04-11	15931595	ND
2017-04-11	15931574	ND
2017-04-11	15931637	ND
2018-04-11	39073401	ND
2018-04-11	39072901	ND
2018-04-11	39074201	ND
2018-04-11	39073001	ND
2019-04-08	43659301	ND
2019-04-08	43660501	ND
2019-04-08	43660601	ND
2019-04-23	43659401	ND