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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

River Falls Waterworks

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

 

31

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND50ND
2014ND100ND
2015ND20ND
2016ND40ND
2017ND80ND
2018ND10ND
2019ND10ND

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
2013-10-09751783-10032ND
2013-10-09751785-10019ND
2013-10-16753336-10050ND
2013-10-16753334-10045ND
2013-10-22754225-10078ND
2014-04-09779354-11131ND
2014-04-09779356-11131ND
2014-04-21781593-11212ND
2014-04-21781590-11212ND
2014-04-23782179-11259ND
2014-06-11796163ND
2014-06-11796160ND
2014-06-11796157ND
2014-06-11796166ND
2014-06-11796169ND
2015-09-24885690ND
2015-10-26890948ND
2016-03-17910824ND
2016-05-31923422ND
2016-09-13945512ND
2016-10-11952738ND
2017-03-07976543ND
2017-05-01986327ND
2017-05-02986335ND
2017-05-02986343ND
2017-05-02986331ND
2017-05-02986339ND
2017-07-271007195ND
2017-10-101023449ND
2018-06-051060415ND
2019-09-101146566ND