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EWG's Tap Water Database — 2021 UPDATE

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cis-1,2-Dichloroethylene

Montara Water and Sanitary 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

 

152

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.528 ppb174ND - 3.70 ppb
20151.48 ppb127ND - 5.00 ppb
20161.10 ppb156ND - 4.30 ppb
20170.520 ppb4413ND - 3.80 ppb
20180.573 ppb3611ND - 3.50 ppb
20190.456 ppb2810ND - 1.80 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
2014-01-201233-030-11503.70 ppb
2014-01-201233-031-11400.570 ppb
2014-01-201233-032-1110ND
2014-04-211233-030-10503.20 ppb
2014-04-211233-031-1030ND
2014-04-211233-032-1100ND
2014-05-135810-003-1000ND
2014-08-275810-001-1140ND
2014-08-275810-008-0845ND
2014-08-275810-011-0900ND
2014-08-275810-012-1200ND
2014-08-275810-014-1020ND
2014-08-275810-015-1120ND
2014-09-035810-010-1400ND
2014-10-201233-030-10201.50 ppb
2014-10-201233-031-1010ND
2014-10-201233-032-1025ND
2015-01-191233-030-10555.00 ppb
2015-01-191233-031-1110ND
2015-01-191233-032-1000ND
2015-04-201233-031-10350.520 ppb
2015-04-201233-032-1045ND
2015-05-181233-030-10404.30 ppb
2015-07-201233-030-11102.80 ppb
2015-07-201233-031-11000.530 ppb
2015-07-201233-032-1120ND
2015-10-191233-030-08504.00 ppb
2015-10-191233-031-10500.620 ppb
2015-10-191233-032-1015ND
2016-01-181233-030-10202.30 ppb
2016-01-181233-031-1110ND
2016-01-181233-032-1030ND
2016-01-285810-011-0930ND
2016-05-185810-030-12003.90 ppb
2016-05-185810-031-1150ND
2016-05-185810-032-1215ND
2016-09-155810-030-10353.80 ppb
2016-09-155810-031-10150.520 ppb
2016-09-155810-032-1045ND
2016-12-015810-031-1015ND
2016-12-015810-032-1035ND
2016-12-135810-030-11584.30 ppb
2016-12-191233-809-11001.70 ppb
2016-12-191233-811-1105ND
2017-01-255810-030-09152.60 ppb
2017-01-255810-031-09000.650 ppb
2017-01-255810-032-0930ND
2017-02-135810-809-1121ND
2017-02-135810-811-1122ND
2017-03-205810-809-1020ND
2017-03-205810-811-1027ND
2017-04-135810-003-1020ND
2017-04-135810-030-10203.80 ppb
2017-04-135810-031-1000ND
2017-04-135810-032-1040ND
2017-04-195810-809-10491.30 ppb
2017-04-195810-811-1059ND
2017-05-085810-809-12000.960 ppb
2017-05-085810-811-1200ND
2017-06-065810-809-11501.10 ppb
2017-06-065810-811-1150ND
2017-07-055810-809-1145ND
2017-07-055810-811-1145ND
2017-07-205810-003-1120ND
2017-08-075810-001-0900ND
2017-08-075810-008-1010ND
2017-08-075810-010-0915ND
2017-08-075810-012-1000ND
2017-08-075810-014-0930ND
2017-08-075810-015-0915ND
2017-08-075810-809-1100ND
2017-08-075810-811-1100ND
2017-08-105810-031-0845ND
2017-08-105810-032-0905ND
2017-09-065810-030-11103.00 ppb
2017-09-065810-809-10522.10 ppb
2017-09-065810-811-1056ND
2017-10-105810-809-10001.60 ppb
2017-10-105810-811-1000ND
2017-11-085810-001-1105ND
2017-11-085810-014-0920ND
2017-11-095810-030-11202.10 ppb
2017-11-095810-031-10400.570 ppb
2017-11-095810-032-1130ND
2017-11-095810-809-11001.40 ppb
2017-11-095810-811-1100ND
2017-12-075810-809-10351.70 ppb
2017-12-075810-811-1045ND
2018-02-075810-030-13152.30 ppb
2018-02-075810-031-13050.510 ppb
2018-02-075810-032-1400ND
2018-02-085810-014-0845ND
2018-02-085810-809-0930ND
2018-02-085810-811-0933ND
2018-03-135810-809-0850ND
2018-03-135810-811-0905ND
2018-04-045810-809-0900ND
2018-04-045810-811-0900ND
2018-05-015810-030-10503.50 ppb
2018-05-015810-031-1020ND
2018-05-015810-032-1145ND
2018-05-015810-809-10003.30 ppb
2018-05-015810-811-1000ND
2018-06-185810-809-1210ND
2018-06-185810-811-1215ND
2018-07-165810-809-1430ND
2018-07-165810-811-1430ND
2018-07-265810-030-11002.80 ppb
2018-07-265810-031-11400.500 ppb
2018-07-265810-032-1110ND
2018-08-025810-809-12251.80 ppb
2018-08-025810-811-1225ND
2018-09-115810-809-1000ND
2018-09-115810-811-1000ND
2018-10-155810-809-09201.40 ppb
2018-10-155810-811-0920ND
2018-11-135810-015-0840ND
2018-11-135810-809-09301.20 ppb
2018-11-135810-811-0930ND
2018-11-155810-030-09002.30 ppb
2018-11-155810-031-0815ND
2018-11-155810-032-0835ND
2018-12-105810-809-11001.000 ppb
2018-12-105810-811-1100ND
2019-01-095810-809-10401.000 ppb
2019-01-095810-811-1042ND
2019-02-055810-809-11151.000 ppb
2019-02-055810-811-1110ND
2019-02-125810-015-0935ND
2019-02-195810-030-09401.80 ppb
2019-02-195810-031-09100.560 ppb
2019-02-195810-032-1000ND
2019-03-045810-809-0852ND
2019-03-045810-811-0858ND
2019-04-095810-809-1025ND
2019-04-095810-811-1030ND
2019-05-155810-809-08501.80 ppb
2019-05-155810-811-0850ND
2019-06-105810-809-08401.10 ppb
2019-06-105810-811-0840ND
2019-07-095810-809-11401.000 ppb
2019-07-095810-811-1140ND
2019-08-065810-809-09501.10 ppb
2019-08-065810-811-1000ND
2019-09-175810-809-1110ND
2019-09-175810-811-1112ND
2019-10-145810-809-1140ND
2019-10-145810-811-1140ND
2019-11-055810-809-10501.80 ppb
2019-11-055810-811-1050ND
2019-12-035810-809-09091.60 ppb
2019-12-035810-811-0913ND