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EWG's Tap Water Database — 2021 UPDATE

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cis-1,2-Dichloroethylene

Maryland American Water Company

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

 

81

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND180ND
2015ND130ND
2016ND160ND
2017ND80ND
2018ND110ND
2019ND150ND

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
2014-01-140120003_02_24479ND
2014-02-120120003_02_24872ND
2014-02-120120003_02_24872ND
2014-02-120120003_02_24872ND
2014-02-120120003_02_24872ND
2014-02-140120003_02_24873ND
2014-02-180120003_02_24873ND
2014-03-100120003_02_25038ND
2014-04-080120003_02_25195ND
2014-05-130120003_01_25676ND
2014-05-130120003_02_25671ND
2014-06-180120003_02_25934ND
2014-07-160120003_02_26312ND
2014-08-120120003_02_26567ND
2014-09-040120003_02_00086ND
2014-09-110120003_02_26908ND
2014-10-150120003_02_27258ND
2014-12-080120003_02_27708ND
2015-01-150120003_02_28007ND
2015-02-120120003_02_28168ND
2015-03-0428311401ND
2015-04-1428658101ND
2015-05-1228900201ND
2015-06-1629076501ND
2015-07-1429505701ND
2015-08-1129933801ND
2015-09-0830098901ND
2015-10-06E16001485018ND
2015-10-1330312301ND
2015-11-1630555501ND
2015-12-2130763601ND
2016-01-1231004801ND
2016-02-1031164301ND
2016-03-0831416101ND
2016-04-1231602201ND
2016-05-1031993001ND
2016-05-1031992001ND
2016-05-1031991901ND
2016-06-27328777ND
2016-07-12326537ND
2016-08-09328815ND
2016-09-0133187001ND
2016-09-2033597601ND
2016-10-11334095ND
2016-11-08337002ND
2016-11-30E17002347004ND
2016-12-1433923101ND
2017-01-1734232601ND
2017-02-1434563201ND
2017-03-1434852301ND
2017-04-1135076401ND
2017-05-0935398301ND
2017-05-0935393101ND
2017-05-3036129801ND
2017-10-31E18001764001ND
2018-05-1539313501ND
2018-05-1539311001ND
2018-06-1239750101ND
2018-07-1740177201ND
2018-08-0640553401ND
2018-09-1840907401ND
2018-09-18E19000995004ND
2018-09-27E19001118001ND
2018-10-0941360801ND
2018-11-0541786201ND
2018-12-0542194901ND
2019-01-1542524401ND
2019-02-1342808201ND
2019-03-1343266901ND
2019-04-10435849ND
2019-05-16438936ND
2019-05-21438937ND
2019-06-25443655ND
2019-07-17E20000222010ND
2019-07-18449856ND
2019-08-28455573ND
2019-09-0546211001ND
2019-09-05E20000962001ND
2019-10-0246770701ND
2019-11-1147048901ND
2019-12-1047529401ND