cis-1,2-Dichloroethylene

Warren Water 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.

MORE ABOUT THIS CONTAMINANT

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2013	N/A	0	0	N/A
2014	ND	5	0	ND
2015	0.733 ppb	6	6	0.600 ppb - 0.900 ppb
2016	0.633 ppb	9	9	0.500 ppb - 0.700 ppb
2017	0.567 ppb	3	3	0.500 ppb - 0.600 ppb
2018	0.675 ppb	4	4	0.600 ppb - 0.700 ppb
2019	0.700 ppb	7	7	0.500 ppb - 0.900 ppb

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
2015-08-03	OE276441	0.900 ppb
2015-08-03	OE276438	0.800 ppb
2015-11-03	OE314444	0.600 ppb
2015-11-03	OE314443	0.700 ppb
2015-11-03	OE314442	0.700 ppb
2015-11-03	OE314441	0.700 ppb
2016-02-17	OE346333	0.700 ppb
2016-02-17	OE346335	0.700 ppb
2016-02-17	OE346336	0.700 ppb
2016-02-17	OE346334	0.700 ppb
2016-08-16	OE416380	0.500 ppb
2016-11-15	OE452727	0.700 ppb
2016-11-15	OE452726	0.600 ppb
2016-11-15	OE452725	0.500 ppb
2016-11-15	OE452728	0.600 ppb
2017-02-13	OE480567	0.600 ppb
2017-02-13	OE480568	0.600 ppb
2017-02-13	OE480570	0.500 ppb
2018-11-14	OE740242	0.700 ppb
2018-11-14	OE740243	0.600 ppb
2018-11-14	OE740244	0.700 ppb
2018-11-14	OE740245	0.700 ppb
2019-05-15	OE809334	0.700 ppb
2019-05-15	OE809335	0.900 ppb
2019-05-16	OE809336	0.700 ppb
2019-05-16	OE809337	0.700 ppb
2019-08-06	OE847448	0.500 ppb
2019-11-12	OE893512	0.700 ppb
2019-11-12	OE893514	0.700 ppb