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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

City of Billings

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

 

37

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND40ND
2014ND40ND
2015ND40ND
2016ND40ND
2017ND120ND
2018ND40ND
2019ND50ND

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
2013-02-12704968-8092ND
2013-05-07718174-8781ND
2013-08-13737612-9513ND
2013-11-04757057-10235ND
2014-02-10B14020492-001FND
2014-05-12B14051004-001AND
2014-08-11B14081054-001DND
2014-11-12B14110966-007AND
2015-02-09B15020974-001DND
2015-05-11B15051144-009AND
2015-08-10B15080796-002AND
2015-11-09B15110678-001AND
2016-02-08B16020890-001DND
2016-05-10B16051069-001AND
2016-08-08B16081057-001AND
2016-11-09B16110820-001AND
2017-02-08B17020497-002DND
2017-05-08B17051019-001DND
2017-08-07B17081099-001DND
2017-11-06B17110842-003AND
2017-11-06B17110842-002AND
2017-11-06B17110842-001AND
2017-11-07B17110842-005AND
2017-11-07B17110842-004AND
2017-11-08B17110842-008AND
2017-11-08B17110842-007AND
2017-11-08B17110842-006AND
2017-11-09B17110842-009AND
2018-02-05B18020545-001FND
2018-05-07B18051134-001FND
2018-08-06B18080949-002END
2018-08-06B18080949-001FND
2019-02-11B19020608-001FND
2019-05-13B19051523-001AND
2019-08-12B19081432-001AND
2019-11-13B19111116-001AND
2019-11-13B19111116-002AND