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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

City of Tacoma

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

 

46

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND50ND
2015ND310ND
2016ND10ND
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
2014-08-06201408070493AMND
2014-11-1329191ND
2014-11-1429192ND
2014-11-1830352ND
2014-12-0234852ND
2015-03-10201503110935AMND
2015-03-10201502170548AMND
2015-03-10201503120179AMND
2015-06-0827944ND
2015-06-09201505060001AMND
2015-06-17201505060005AMND
2015-06-29201505020034AMND
2015-07-06201505020035AMND
2015-07-08201507090318AMND
2015-07-09201507100395AMND
2015-07-09201506300092AMND
2015-08-0585793ND
2015-08-24201508250628AMND
2015-09-09201508050013AMND
2015-09-09201508050009AMND
2015-10-13201509250020AMND
2015-12-0138661ND
2015-12-0138661ND
2015-12-0138661ND
2015-12-0138661ND
2015-12-0238662ND
2015-12-0238662ND
2015-12-0238662ND
2015-12-0238662ND
2015-12-0338663ND
2015-12-0338663ND
2015-12-0338663ND
2015-12-0338663ND
2015-12-0741681ND
2015-12-0741682ND
2015-12-0841683ND
2016-04-06ND
2017-05-10ND
2017-05-10ND
2017-10-10ND
2018-02-07ND
2018-03-12ND
2018-03-19ND
2019-01-02ND
2019-07-24ND
2019-12-03ND