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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Westford Water Department

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.

 

20

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND80ND
2015ND40ND
2016ND20ND
2017ND20ND
2018ND20ND
2019ND20ND

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 Result
2014-04-23ND
2014-04-23ND
2014-06-11ND
2014-06-11ND
2014-07-15ND
2014-07-15ND
2014-10-27ND
2014-10-27ND
2015-01-14ND
2015-01-14ND
2015-05-04ND
2015-05-04ND
2016-04-05ND
2016-04-06ND
2017-05-24ND
2017-05-24ND
2018-05-15ND
2018-05-16ND
2019-05-01ND
2019-05-01ND