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EWG's Tap Water Database — 2019 UPDATE

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Chloromethane

Choice Water Supply Corporation

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.

 

9

Samples

0

Samples exceeding legal limit (MCL)

2

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20121.13 ppb111.13 ppb
20132.24 ppb112.24 ppb
20143.85 ppb113.85 ppb
2015ND20ND
20162.17 ppb21ND - 4.34 ppb
2017ND20ND

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
2012-02-1612025080031.13 ppb
2013-08-13Q13053880082.24 ppb
2014-09-02Q14409660013.85 ppb
2015-07-30Q1529716001ND
2015-07-30Q1529716003ND
2016-09-13Q1637145001ND
2016-09-13Q16371450034.34 ppb
2017-11-03Q1756823006ND
2017-11-03Q1756823001ND