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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

City of Pasadena

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

 

59

Samples

0

Samples exceeding legal limit (MCL)

3

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND190ND
20152.62 ppb54ND - 3.90 ppb
2016ND80ND
2017ND110ND
2018ND90ND
2019ND70ND

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
2014-01-211068590007ND
2014-01-211068590004ND
2014-01-211068590010ND
2014-01-221068803004ND
2014-01-221068803007ND
2014-01-231068803010ND
2014-03-06AC45988ND
2014-03-06AC46000ND
2014-04-162002669007ND
2014-04-162002669010ND
2014-04-24AC51722ND
2014-04-24AC51724ND
2014-04-24AC51728ND
2014-09-022026794007ND
2014-09-032027138002ND
2014-09-222030537008ND
2014-09-222030537005ND
2014-09-292031681005ND
2014-09-292031681008ND
2015-01-14AC762733.90 ppb
2015-01-14AC762652.30 ppb
2015-01-14AC762293.20 ppb
2015-01-14AC76267ND
2015-01-14AC762033.70 ppb
2016-01-11AD17364ND
2016-01-11AD17360ND
2016-01-11AD17352ND
2016-04-06AD32085ND
2016-04-06AD32083ND
2016-06-17AD41169ND
2016-07-06AD43177ND
2016-10-06AD52692ND
2017-03-16AD75448ND
2017-03-16AD75466ND
2017-03-16AD75462ND
2017-03-16AD75468ND
2017-03-16AD75454ND
2017-03-16AD75450ND
2017-03-16AD75452ND
2017-04-04AD78285ND
2017-07-11AD88935ND
2017-09-18AD96543ND
2017-10-31AE02981ND
2018-02-06AE12532ND
2018-02-06AE12534ND
2018-05-02AE24851ND
2018-05-02AE24847ND
2018-05-02AE24855ND
2018-05-02AE24845ND
2018-06-26AE31497ND
2018-06-26AE31481ND
2018-11-14AE46107ND
2019-01-30AE52244ND
2019-01-30AE52210ND
2019-03-06AE57409ND
2019-03-06AE57411ND
2019-03-06AE57407ND
2019-08-06AE77247ND
2019-08-06AE77265ND