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EWG's Tap Water Database — 2019 UPDATE

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Chloromethane

California Water Service Company - Dominguez

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.

 

61

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND90ND
2013ND110ND
20140.0148 ppb231ND - 0.340 ppb
2015ND70ND
2016ND70ND
2017ND40ND

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
2012-03-219590-024-1340ND
2012-03-219590-022-1548ND
2012-03-219590-019-1450ND
2012-06-139590-019-0940ND
2012-08-089590-004-1338ND
2012-08-089590-018-1415ND
2012-09-059590-019-1043ND
2012-12-059590-019-1345ND
2012-12-195810-024-1313ND
2013-03-069590-019-0905ND
2013-03-069590-024-1002ND
2013-06-059590-019-1305ND
2013-08-079590-018-1207ND
2013-09-119590-022-1432ND
2013-09-189590-016-1353ND
2013-09-189590-019-1127ND
2013-09-199590-004-1436ND
2013-11-209590-018-1400ND
2013-12-049590-019-0940ND
2013-12-189590-024-1325ND
2014-04-02201404030215AMND
2014-04-02201404030190AMND
2014-04-02201404030202AMND
2014-04-09201404100039AMND
2014-04-09201404100021AMND
2014-04-09201404100049AMND
2014-04-16201404161006AM0.340 ppb
2014-04-16201404161015AMND
2014-04-16201404161020AMND
2014-05-229590-018-1002ND
2014-07-09201407100245AMND
2014-07-16201407160938AMND
2014-07-16201407160951AMND
2014-07-17201407170900AMND
2014-07-17201407170891AMND
2014-08-135810-805-1142ND
2014-10-01201410010680AMND
2014-10-01201410010696AMND
2014-10-159590-805-1054ND
2014-10-22201410220557AMND
2014-10-22201410220543AMND
2014-10-31201410310235AMND
2014-12-179590-004-1450ND
2015-01-07201501070702AMND
2015-01-07201501080023AMND
2015-01-08201501080799AMND
2015-01-14201501141133AMND
2015-01-14201501141020AMND
2015-12-239590-022-1040ND
2015-12-299590-016-1150ND
2016-03-169590-004-1040ND
2016-03-239590-018-1340ND
2016-07-239590-057-1000ND
2016-07-279590-057-1105ND
2016-12-145810-805-1104ND
2016-12-219590-016-1255ND
2016-12-289590-019-0930ND
2017-03-089590-019-1430ND
2017-07-129590-805-1001ND
2017-10-169590-805-1030ND
2017-11-085810-805-1058ND