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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Golden State WC - Placentia

Chloromethane is an industrial solvent, aerosol propellant and a refrigerant. It also forms as a byproduct of water disinfection. The EPA classifies chloromethane as possibly carcinogenic to humans.

MORE ABOUT THIS CONTAMINANT

 

107

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND90ND
2014ND70ND
2015ND150ND
2016ND270ND
2017ND210ND
2018ND140ND
2019ND140ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 2.69 ppb

The EWG Health Guideline of 2.69 ppb for chloromethane was defined by the Environmental Protection Agency as a benchmark for testing under the Unregulated Contaminant Monitoring Rule program. This health guideline protects against cancer.

ppb = parts per billion

All test results

Date Lab ID Result
2013-02-053010035805ND
2013-02-053010035802ND
2013-02-053010035806ND
2013-03-043010035807ND
2013-06-103010035807-2ND
2013-08-053010035806-2ND
2013-08-063010035805-2ND
2013-09-033010035807-3ND
2013-12-093010035807-4ND
2014-01-234417-001-0920ND
2014-01-234417-002-0935ND
2014-01-234417-005-1000ND
2014-03-104417-003-1140ND
2014-04-164417-001-0940ND
2014-04-164417-002-0950ND
2014-04-164417-005-1015ND
2015-01-204417-001-0940ND
2015-01-204417-005-1015ND
2015-03-094417-003-1010ND
2015-03-254417-002-1135ND
2015-04-204417-002-0905ND
2015-04-204417-003-0845ND
2015-04-204417-005-0935ND
2015-06-154417-001-1025ND
2015-07-064417-001-0935ND
2015-07-064417-002-0920ND
2015-07-064417-005-1000ND
2015-10-204417-001-0955ND
2015-10-204417-002-0940ND
2015-10-204417-003-0905ND
2015-10-204417-005-1020ND
2016-01-194417-001-1040ND
2016-01-194417-002-1030ND
2016-01-194417-003-1100ND
2016-01-194417-005-1130ND
2016-04-194417-001-0940ND
2016-04-194417-002-0950ND
2016-04-194417-003-0920ND
2016-04-194417-005-1030ND
2016-05-174417-001-0855ND
2016-05-174417-002-0805ND
2016-05-174417-003-0825ND
2016-06-084417-003-1050ND
2016-07-184417-001-0930ND
2016-07-184417-002-0910ND
2016-07-184417-003-0850ND
2016-07-184417-005-1010ND
2016-07-274417-003-1110ND
2016-08-154417-001-0830ND
2016-08-154417-001-0840ND
2016-08-154417-003-0815ND
2016-09-214417-003-0955ND
2016-10-174417-001-1025ND
2016-10-174417-002-1035ND
2016-10-174417-003-1005ND
2016-10-174417-005-1050ND
2016-11-144417-003-1000ND
2016-12-054417-003-1010ND
2017-01-104417-001-1030ND
2017-01-104417-002-1020ND
2017-01-104417-005-1040ND
2017-01-244417-003-1100ND
2017-02-024417-003-0905ND
2017-03-074417-003-0850ND
2017-04-274417-001-0915ND
2017-04-274417-002-0905ND
2017-04-274417-003-0845ND
2017-05-014417-005-1240ND
2017-05-154417-003-1030ND
2017-06-204417-003-1105ND
2017-07-274417-001-1010ND
2017-07-274417-002-1025ND
2017-07-274417-005-1045ND
2017-08-314417-003-0845ND
2017-09-054417-003-1120ND
2017-10-054417-001-1020ND
2017-10-054417-002-1010ND
2017-10-054417-003-0930ND
2017-10-054417-005-1035ND
2018-01-294417-001-0850ND
2018-01-294417-002-0900ND
2018-01-294417-005-0920ND
2018-02-054417-003-0930ND
2018-04-244417-001-1225ND
2018-04-244417-002-1235ND
2018-04-244417-003-1100ND
2018-04-244417-003-1120ND
2018-07-024417-001-1020ND
2018-07-024417-002-1045ND
2018-07-024417-003-0850ND
2018-10-084417-001-1035ND
2018-10-084417-002-1045ND
2018-10-084417-003-1010ND
2019-01-104417-001-1040ND
2019-01-104417-002-1050ND
2019-01-104417-003-1000ND
2019-01-104417-005-1110ND
2019-04-294417-001-0925ND
2019-04-294417-002-0940ND
2019-04-294417-003-0840ND
2019-05-064417-003-1235ND
2019-07-164417-001-0940ND
2019-07-164417-002-1005ND
2019-08-064417-003-1325ND
2019-10-244417-002-1055ND
2019-10-244417-003-1015ND
2019-11-254417-001-0900ND