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EWG's Tap Water Database — 2021 UPDATE

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cis-1,2-Dichloroethylene

Golden State Water Company (GSWC) - Norwalk

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

 

166

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND50ND
2015ND50ND
2016ND60ND
2017ND430ND
2018ND550ND
2019ND520ND

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
2014-02-042706-010-1225ND
2014-02-042706-016-0900ND
2014-05-062706-016-1028ND
2014-08-062706-016-0940ND
2014-11-042706-016-1054ND
2015-02-022706-010-1023ND
2015-02-032706-016-1152ND
2015-05-072706-016-1358ND
2015-08-042706-016-0821ND
2015-11-042706-016-1304ND
2016-05-022706-028-1147ND
2016-05-022706-032-0751ND
2016-05-042706-016-0910ND
2016-05-042706-016-0921ND
2016-08-022706-016-1146ND
2016-11-082706-016-1303ND
2017-01-049590-028-1216ND
2017-01-049590-032-0828ND
2017-01-119590-028-1057ND
2017-01-179590-016-1232ND
2017-01-189590-028-1306ND
2017-01-189590-032-1354ND
2017-01-239590-032-1212ND
2017-02-099590-010-1025ND
2017-02-139590-016-0850ND
2017-02-279590-028-1013ND
2017-03-219590-028-1135ND
2017-03-299590-028-1120ND
2017-04-059590-028-0938ND
2017-04-119590-028-1006ND
2017-04-199590-028-0902ND
2017-04-249590-028-1057ND
2017-05-039590-016-0920ND
2017-05-039590-028-1305ND
2017-05-099590-028-0720ND
2017-05-169590-028-0750ND
2017-05-229590-028-1308ND
2017-05-319590-028-1140ND
2017-07-069590-028-1127ND
2017-07-129590-028-1006ND
2017-07-179590-028-0715ND
2017-07-249590-028-0826ND
2017-08-019590-016-1029ND
2017-08-029590-028-0752ND
2017-08-149590-028-1104ND
2017-09-079590-028-1032ND
2017-09-189590-028-0727ND
2017-09-279590-028-0820ND
2017-10-029590-028-0714ND
2017-10-109590-028-0805ND
2017-10-189590-028-1323ND
2017-11-019590-028-0727ND
2017-11-099590-016-1103ND
2017-11-159590-028-1158ND
2017-11-219590-028-0936ND
2017-11-299590-028-0957ND
2017-12-079590-028-1317ND
2017-12-139590-028-1348ND
2017-12-199590-028-1100ND
2018-01-039590-028-1433ND
2018-01-089590-028-0946ND
2018-01-179590-028-0840ND
2018-01-249590-028-1325ND
2018-01-319590-028-1406ND
2018-02-079590-032-1340ND
2018-02-089590-016-1401ND
2018-02-129590-010-1230ND
2018-02-139590-028-1346ND
2018-02-219590-028-1126ND
2018-02-289590-028-1225ND
2018-03-079590-016-1407ND
2018-03-079590-028-1338ND
2018-03-079590-032-1304ND
2018-03-159590-028-0901ND
2018-03-219590-028-0838ND
2018-03-289590-028-1238ND
2018-04-059590-028-1226ND
2018-04-119590-028-1407ND
2018-04-189590-028-1012ND
2018-04-259590-028-1223ND
2018-05-029590-016-1147ND
2018-05-089590-028-1316ND
2018-05-169590-028-1005ND
2018-05-239590-028-1312ND
2018-05-309590-028-1228ND
2018-06-069590-028-1145ND
2018-06-139590-028-0910ND
2018-06-209590-028-1232ND
2018-06-279590-028-1353ND
2018-07-059590-028-1216ND
2018-07-119590-028-1210ND
2018-07-189590-028-0811ND
2018-07-269590-028-0731ND
2018-07-309590-028-0826ND
2018-08-159590-028-1234ND
2018-08-229590-028-0833ND
2018-08-299590-028-1326ND
2018-09-069590-028-1415ND
2018-09-109590-028-1138ND
2018-09-129590-016-1156ND
2018-09-199590-028-0911ND
2018-09-269590-028-1222ND
2018-10-039590-028-1415ND
2018-10-089590-028-0851ND
2018-10-179590-028-1205ND
2018-10-229590-028-1034ND
2018-10-299590-028-1028ND
2018-11-069590-016-1203ND
2018-11-079590-032-1332ND
2018-11-149590-028-1309ND
2018-12-069590-028-1009ND
2018-12-109590-028-1257ND
2018-12-199590-028-1255ND
2018-12-269590-028-1326ND
2019-01-029590-028-1145ND
2019-01-099590-028-1333ND
2019-01-169590-028-1340ND
2019-01-239590-028-0858ND
2019-01-309590-028-1307ND
2019-02-069590-028-1308ND
2019-02-119590-016-1054ND
2019-02-119590-032-1330ND
2019-02-129590-028-1333ND
2019-02-209590-028-0751ND
2019-02-259590-028-1030ND
2019-03-059590-028-1332ND
2019-03-119590-028-1258ND
2019-03-189590-028-0953ND
2019-03-259590-028-1239ND
2019-04-019590-028-1251ND
2019-04-109590-028-1209ND
2019-04-179590-028-0800ND
2019-04-249590-028-1247ND
2019-04-299590-028-1139ND
2019-05-089590-016-1140ND
2019-05-159590-028-1238ND
2019-05-229590-028-1145ND
2019-05-299590-028-1240ND
2019-06-059590-028-1250ND
2019-06-129590-028-1022ND
2019-06-199590-028-1419ND
2019-06-269590-028-1339ND
2019-07-309590-028-1102ND
2019-08-069590-028-1258ND
2019-08-069590-032-1220ND
2019-08-129590-028-1210ND
2019-08-209590-028-1137ND
2019-08-279590-028-0908ND
2019-09-049590-028-1320ND
2019-09-109590-028-1104ND
2019-09-179590-028-0827ND
2019-09-239590-028-0821ND
2019-10-029590-028-1315ND
2019-10-089590-028-1255ND
2019-10-159590-028-1316ND
2019-10-229590-028-0914ND
2019-10-309590-028-1305ND
2019-11-069590-028-1327ND
2019-11-069590-032-1235ND
2019-11-129590-028-1300ND
2019-11-189590-028-1316ND
2019-11-259590-028-1119ND
2019-12-039590-028-1202ND
2019-12-109590-028-0914ND
2019-12-169590-028-0825ND
2019-12-269590-028-1212ND