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EWG's Tap Water Database — 2021 UPDATE

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1,1-Dichloroethylene

Cerritos - City, Water Department

1,1-Dichloroethylene is used for plastics production. It damages DNA and causes cancer in laboratory animal studies.

MORE ABOUT THIS CONTAMINANT

 

37

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
20140.183 ppb61ND - 1.10 ppb
20150.173 ppb31ND - 0.520 ppb
20160.452 ppb53ND - 0.920 ppb
20170.306 ppb114ND - 1.30 ppb
20180.838 ppb64ND - 1.70 ppb
20190.803 ppb64ND - 1.60 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EPA Maximum Contaminant
Level (MCL) 7 ppb

The legal limit for 1,1-dichloroethylene, established in 1987, was based on a toxicity study conducted in laboratory animals in the 1980s.

ppb = parts per billion

All test results

Date Lab ID Result
2014-02-142706-002-0900ND
2014-02-142706-003-0920ND
2014-05-222706-002-0855ND
2014-08-212706-001-0948ND
2014-08-212706-002-0936ND
2014-11-202706-002-09201.10 ppb
2015-02-122706-001-1200ND
2015-02-122706-003-1250ND
2015-06-302706-002-14000.520 ppb
2016-02-259588-001-1115ND
2016-02-259588-003-1140ND
2016-05-259588-002-13400.670 ppb
2016-08-299588-002-12000.920 ppb
2016-11-289588-002-11300.670 ppb
2017-01-01ND*
2017-01-01ND*
2017-02-239588-002-11000.680 ppb
2017-02-239588-001-1040ND
2017-02-239588-003-1115ND
2017-05-249588-002-11101.30 ppb
2017-06-01ND*
2017-08-249588-002-11450.680 ppb
2017-10-199588-002-12050.710 ppb
2017-12-31ND*
2017-12-31ND*
2018-02-229588-003-1130ND
2018-02-229588-002-12101.20 ppb
2018-02-229588-001-1110ND
2018-05-249588-002-12150.830 ppb
2018-08-159588-002-08101.30 ppb
2018-11-279588-002-08201.70 ppb
2019-02-139588-003-0835ND
2019-02-139588-002-10051.60 ppb
2019-02-139588-001-0755ND
2019-05-239588-002-09301.50 ppb
2019-08-089588-002-09450.780 ppb
2019-11-079588-002-09350.940 ppb

* Sample result is taken from the system's CCR report.