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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.

 

11

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014N/A00N/A
2015N/A00N/A
2016ND30ND
2017ND40ND
2018N/A00N/A
2019ND40ND

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
2016-07-12AD78839ND
2016-07-12AD78838ND
2016-10-11AD83446ND
2017-03-08AD90865ND
2017-06-07AD95521ND
2017-08-09AD98892ND
2017-10-11AE01863ND
2019-03-07AE26870ND
2019-05-06AE29806ND
2019-08-06AE34771ND
2019-10-16AE38827ND