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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Groton Utilities

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.

 

10

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND10ND
2014ND40ND
2015ND10ND
2016ND10ND
2017ND10ND
2018ND10ND
2019ND10ND

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
2013-10-09201310110409AMND
2014-01-15201401160337AMND
2014-04-23201404240448AMND
2014-07-21201407230794AMND
2014-10-2319670VOC1ND
2015-10-1521602VOC1ND
2016-10-2723873VOC1ND
2017-10-2626178VOC1ND
2018-11-2928429VOC1ND
2019-11-2030565VOC1ND