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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

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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

 

34

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND160ND
2014N/A00N/A
2015N/A00N/A
2016ND90ND
2017N/A00N/A
2018N/A00N/A
2019ND90ND

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
2013-05-163593642005AMND
2013-05-163593642011AMND
2013-05-163593642009AMND
2013-05-163593642015AMND
2013-05-163593642013AMND
2013-05-163593642003AMND
2013-05-163593642001AMND
2013-05-163593642007AMND
2013-12-0335118444003AMND
2013-12-0335118444001AMND
2013-12-0335118444007AMND
2013-12-0335118444013AMND
2013-12-0335118444005AMND
2013-12-0335118444009AMND
2013-12-0335118444011AMND
2013-12-0435118444015AMND
2016-03-14AC68338ND
2016-03-14AC68337ND
2016-03-14AC68342ND
2016-03-14AC68336ND
2016-03-14AC68334ND
2016-03-14AC68339ND
2016-03-14AC68340ND
2016-03-14AC68341ND
2016-03-14AC68335ND
2019-03-18AD41176ND
2019-03-18AD41184ND
2019-03-18AD41177ND
2019-03-18AD41178ND
2019-03-18AD41179ND
2019-03-18AD41180ND
2019-03-18AD41181ND
2019-03-18AD41182ND
2019-03-18AD41183ND