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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Washington

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

 

39

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND180ND
2014ND90ND
2015N/A00N/A
2016ND10ND
2017ND90ND
2018ND10ND
2019ND10ND

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
2013-03-263587880005AMND
2013-03-263587880011AMND
2013-03-263587880017AMND
2013-03-273587880013AMND
2013-03-273587880009AMND
2013-03-273587880007AMND
2013-03-273587880001AMND
2013-03-273587880015AMND
2013-03-283587880003AMND
2013-09-1735108698003AMND
2013-09-1735108698011AMND
2013-09-1735108698015AMND
2013-09-1735108698013AMND
2013-09-1735108698001AMND
2013-09-1735108698007AMND
2013-09-1735108698009AMND
2013-09-1735108698005AMND
2013-10-0135110490006AMND
2014-08-22AC33778ND
2014-08-22AC33777ND
2014-08-22AC33779ND
2014-08-22AC33780ND
2014-08-22AC33781ND
2014-08-22AC33782ND
2014-08-22AC33783ND
2014-08-26AC33776ND
2014-08-26AC33784ND
2016-04-27AC70171ND
2017-04-26AC95145ND
2017-08-22AD04334ND
2017-08-22AD04332ND
2017-08-22AD04330ND
2017-08-22AD04331ND
2017-08-22AD04329ND
2017-08-22AD04333ND
2017-08-22AD04335ND
2017-08-22AD04336ND
2018-05-07AD18746ND
2019-04-17AD46846ND