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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Aquarion Water Company of Connecticut - Valley System

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

 

27

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND90ND
2014ND40ND
2015ND30ND
2016ND30ND
2017ND30ND
2018ND20ND
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
2013-06-06201306070176AMND
2013-06-06201306070273AMND
2013-06-06201306070298AMND
2013-06-06201306070098AMND
2013-09-05201309060358AMND
2013-12-03201312040709AMND
2013-12-03201312040681AMND
2013-12-03201312040722AMND
2013-12-03201312040656AMND
2014-02-06201401781-VOC1ND
2014-02-06201401778-VOC1ND
2014-02-06201401783-VOC1ND
2014-03-19201403200579AMND
2015-02-05201501690-VOC1ND
2015-02-05201501687-VOC1ND
2015-10-21201515272-VOC1ND
2016-02-03201601674-VOC1ND
2016-02-03201601672-VOC1ND
2016-02-03201601668-VOC1ND
2017-02-08201702259-VOC1ND
2017-02-08201702257-VOC1ND
2017-06-22201709340-VOC1ND
2018-02-06201801688-VOC1ND
2018-04-30201805765-VOC1ND
2019-02-05201901650-VOC1ND
2019-02-05201901652-VOC1ND
2019-12-16201920349-VOC1ND