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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Butte-Silver Bow Water Department

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
2013ND60ND
2014ND90ND
2015ND50ND
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
2013-07-10201303437ND
2013-07-10201303441ND
2013-07-10201303439ND
2013-10-17201305594ND
2013-10-17201305596ND
2013-10-30201305879ND
2014-01-16201400283ND
2014-01-16201400287ND
2014-01-16201400285ND
2014-02-24B14021519-002END
2014-02-24B14021519-003END
2014-02-24B14021519-001END
2014-04-28201401597ND
2014-04-28201401599ND
2014-04-28201401601ND
2015-02-24B15021845-002CND
2015-02-24B15021845-003CND
2015-02-24B15021845-001CND
2015-11-19201507026ND
2015-11-19201507027ND
2016-02-22B16021667-003CND
2016-02-22B16021667-002CND
2016-02-22B16021667-001CND
2017-06-20B17061971-001END
2017-06-20B17061971-002END
2017-06-20B17061971-003END
2018-03-13B18031136-003CND
2018-03-13B18031136-002CND
2018-03-13B18031136-001CND
2019-03-25B19032022-003CND
2019-03-25B19032022-001CND
2019-03-25B19032022-002CND