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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Waunakee 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

 

32

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND110ND
2015ND80ND
2016ND10ND
2017ND60ND
2018ND40ND
2019ND20ND

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
2014-02-10769678ND
2014-02-10769683ND
2014-02-10769686ND
2014-02-10769680ND
2014-04-16780796ND
2014-04-16780797ND
2014-10-07824703-12579ND
2014-10-07824711-12579ND
2014-10-07824707-12579ND
2014-10-07824699-12579ND
2014-10-13825639-12608ND
2015-03-10847412ND
2015-04-07852429-13851ND
2015-04-07852433-13851ND
2015-04-07852437-13851ND
2015-04-08853084-13847ND
2015-05-04858130ND
2015-07-27873353ND
2015-10-05887254ND
2016-08-16940120ND
2017-01-31971656ND
2017-01-31971660ND
2017-02-06972337ND
2017-04-11982557ND
2017-07-111003165ND
2017-10-031022337ND
2018-01-311039288ND
2018-04-031048174ND
2018-07-111066417ND
2018-10-081085741ND
2019-07-011131600ND
2019-12-021162821ND