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EWG's Tap Water Database — 2019 UPDATE

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Chloromethane

Waukesha Water Utility

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.

 

31

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND30ND
2013ND30ND
2014ND140ND
2015ND40ND
2016N/A00N/A
2017ND70ND

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
2012-03-20655059ND
2012-03-20655057ND
2012-05-22664036ND
2013-02-20706222ND
2013-02-20706220ND
2013-02-20706218ND
2014-03-26776755ND
2014-03-26776753ND
2014-05-07784425ND
2014-05-07784419ND
2014-05-07784422ND
2014-06-11796100ND
2014-06-11796103ND
2014-09-08816380-12269ND
2014-09-08816376-12269ND
2014-09-08816374-12269ND
2014-09-09816778-12294ND
2014-09-09816776-12294ND
2014-09-09816774-12294ND
2014-09-23820801-12402ND
2015-03-10847851ND
2015-03-10847853ND
2015-03-11847855ND
2015-09-29886380ND
2017-03-28980084ND
2017-03-28980081ND
2017-03-28980078ND
2017-05-02986364ND
2017-05-02986361ND
2017-05-31994537ND
2017-05-31994540ND