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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Harwich 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.

MORE ABOUT THIS CONTAMINANT

 

110

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND140ND
2015ND240ND
2016ND140ND
2017ND220ND
2018ND210ND
2019ND150ND

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
2014-02-27ND
2014-02-27ND
2014-02-27ND
2014-02-27ND
2014-02-27ND
2014-02-27ND
2014-03-05ND
2014-03-06ND
2014-03-06ND
2014-03-06ND
2014-03-06ND
2014-03-06ND
2014-03-06ND
2014-03-06ND
2015-02-25ND
2015-02-25ND
2015-02-25ND
2015-02-25ND
2015-02-25ND
2015-02-25ND
2015-02-26ND
2015-02-26ND
2015-02-26ND
2015-02-26ND
2015-02-26ND
2015-02-26ND
2015-02-26ND
2015-03-13ND
2015-04-16ND
2015-04-16ND
2015-04-21ND
2015-04-21ND
2015-04-22ND
2015-10-13ND
2015-10-13ND
2015-10-13ND
2015-10-13ND
2015-10-13ND
2016-02-29ND
2016-02-29ND
2016-02-29ND
2016-02-29ND
2016-02-29ND
2016-03-02ND
2016-03-02ND
2016-03-02ND
2016-03-02ND
2016-03-02ND
2016-03-02ND
2016-03-02ND
2016-03-23ND
2016-03-23ND
2017-02-28ND
2017-02-28ND
2017-03-09ND
2017-03-09ND
2017-03-09ND
2017-03-09ND
2017-03-09ND
2017-03-09ND
2017-03-09ND
2017-03-09ND
2017-03-09ND
2017-03-09ND
2017-03-09ND
2017-03-09ND
2017-05-17ND
2017-05-17ND
2017-06-07ND
2017-08-09ND
2017-08-09ND
2017-12-20ND
2017-12-21ND
2017-12-21ND
2018-03-08ND
2018-03-08ND
2018-03-08ND
2018-03-08ND
2018-03-08ND
2018-03-08ND
2018-03-08ND
2018-03-08ND
2018-03-08ND
2018-03-08ND
2018-03-08ND
2018-03-08ND
2018-05-16ND
2018-05-16ND
2018-05-16ND
2018-08-15ND
2018-08-15ND
2018-08-22ND
2018-12-10ND
2018-12-10ND
2018-12-10ND
2019-03-06ND
2019-03-06ND
2019-03-06ND
2019-03-06ND
2019-03-07ND
2019-03-07ND
2019-06-19ND
2019-06-19ND
2019-06-19ND
2019-08-15ND
2019-08-15ND
2019-08-15ND
2019-12-04ND
2019-12-04ND
2019-12-04ND