cis-1,2-Dichloroethylene

Mountain View Mobile Estates LLC

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
2014	0.750 ppb	4	4	0.670 ppb - 0.810 ppb
2015	0.963 ppb	4	4	0.800 ppb - 1.10 ppb
2016	0.1000 ppb	5	1	ND - 0.500 ppb
2017	0.180 ppb	4	1	ND - 0.720 ppb
2018	0.503 ppb	4	3	ND - 0.730 ppb
2019	0.634 ppb	5	4	ND - 0.970 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
2014-02-25	2303-002-1100	0.800 ppb
2014-05-06	2303-002-1100	0.810 ppb
2014-08-20	2303-002-1100	0.720 ppb
2014-11-19	2303-002-1110	0.670 ppb
2015-02-11	2303-002-1035	0.800 ppb
2015-05-12	2303-002-1055	0.850 ppb
2015-08-25	2303-002-1405	1.10 ppb
2015-11-10	2303-002-1110	1.10 ppb
2016-02-10	2303-002-1055	ND
2016-05-04	2303-002-1025	ND
2016-08-03	2303-002-1010	ND
2016-08-30	2303-001-1100	ND
2016-11-08	2303-002-1035	0.500 ppb
2017-02-15	2303-002-1000	ND
2017-05-10	2303-002-1010	ND
2017-08-09	2303-002-1045	ND
2017-11-07	2303-002-1030	0.720 ppb
2018-02-21	2303-002-1045	0.700 ppb
2018-05-15	2303-002-1050	0.730 ppb
2018-08-15	2303-002-1030	0.580 ppb
2018-11-07	1610-002-1020	ND
2019-02-13	1610-002-1020	0.800 ppb
2019-05-08	1610-002-1045	0.970 ppb
2019-08-14	1610-002-1005	0.630 ppb
2019-08-14	1610-001-0955	ND
2019-11-13	1610-002-1100	0.770 ppb