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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Metropolitan District Commission

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

 

30

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND60ND
2014ND90ND
2015ND30ND
2016ND30ND
2017ND30ND
2018ND30ND
2019ND30ND

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
2013-07-17201307180742AMND
2013-07-17201307180544AMND
2013-07-17201307180553AMND
2013-10-09201310100586AMND
2013-10-09201310100524AMND
2013-10-09201310100588AMND
2014-01-07201401080365AMND
2014-01-07201401080426AMND
2014-01-07201401080380AMND
2014-04-08201404090441AMND
2014-04-08201404090495AMND
2014-04-08201404090429AMND
2014-07-18AC71438GEND
2014-07-18AC71437GEND
2014-07-21AC71441GEND
2015-06-08AC99641GEND
2015-06-08AC99645GEND
2015-06-08AC99642GEND
2016-06-15AD32724GEND
2016-06-15AD32723GEND
2016-06-16AD32722GEND
2017-06-26AD66733GEND
2017-06-26AD66734GEND
2017-06-27AD66735GEND
2018-07-16AE00927GEND
2018-07-16AE00911GEND
2018-07-16AE00912GEND
2019-06-05AE29315GEND
2019-06-05AE29313GEND
2019-06-05AE29314GEND