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EWG's Tap Water Database — 2019 UPDATE

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Chloromethane

East Rio Hondo WSC

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.

 

11

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND10ND
2013ND50ND
2014ND20ND
2015ND10ND
2016ND10ND
2017ND10ND

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
2012-07-171207591005ND
2013-09-10AC29674ND
2013-09-30Q1308427005ND
2013-09-30Q1308427009ND
2013-09-30Q1308427001ND
2013-12-19Q1319042001ND
2014-06-24Q1423172001ND
2014-09-09AC66293ND
2015-09-23AD08313ND
2016-09-27AD51521ND
2017-09-07AD95168ND