cis-1,2-Dichloroethylene

City of Plaquemine Water System

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	Detections	Range of results
2014	0.198 ppb	8	2	ND - 0.790 ppb
2015	N/A	0	0	N/A
2016	0.542 ppb	10	6	ND - 1.40 ppb
2017	N/A	0	0	N/A
2018	N/A	0	0	N/A
2019	0.146 ppb	10	4	ND - 0.380 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
2014-05-19	AD91670	ND
2014-05-19	AD91670	ND
2014-05-21	AD91672	ND
2014-05-21	AD91671	ND
2014-05-21	AD91672	ND
2014-05-21	AD91673	0.790 ppb
2014-05-21	AD91671	ND
2014-05-21	AD91673	0.790 ppb
2016-06-20	35250786003	0.620 ppb
2016-06-20	35250786004	0.690 ppb
2016-06-20	35250786005	1.40 ppb
2016-06-20	35250786002	ND
2016-06-20	35250786001	ND
2016-06-20	35250786005	1.40 ppb
2016-06-20	35250786001	ND
2016-06-20	35250786002	ND
2016-06-20	35250786003	0.620 ppb
2016-06-20	35250786004	0.690 ppb
2019-05-20	35469857002	ND
2019-05-20	35469857001	ND
2019-05-20	35469857001	ND
2019-05-20	35469857002	ND
2019-05-21	35470500001	0.350 ppb
2019-05-21	35470500002	0.380 ppb
2019-05-21	35470500001	0.350 ppb
2019-05-21	35470500002	0.380 ppb
2019-06-12	35475393005	ND
2019-06-12	35475393005	ND