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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Medfield 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

 

123

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND330ND
2015ND350ND
2016ND190ND
2017ND120ND
2018ND120ND
2019ND120ND

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
2014-03-05ND
2014-03-05ND
2014-03-05ND
2014-03-24ND
2014-03-24ND
2014-03-24ND
2014-04-02ND
2014-04-02ND
2014-04-02ND
2014-05-21ND
2014-05-21ND
2014-05-21ND
2014-06-18ND
2014-06-18ND
2014-06-18ND
2014-07-16ND
2014-07-16ND
2014-07-16ND
2014-08-06ND
2014-08-06ND
2014-08-06ND
2014-09-03ND
2014-09-03ND
2014-09-03ND
2014-10-01ND
2014-10-01ND
2014-10-01ND
2014-11-05ND
2014-11-05ND
2014-11-05ND
2014-12-03ND
2014-12-03ND
2014-12-03ND
2015-01-13ND
2015-01-13ND
2015-01-13ND
2015-01-14ND
2015-02-27ND
2015-02-27ND
2015-02-27ND
2015-05-06ND
2015-05-06ND
2015-05-06ND
2015-06-03ND
2015-06-03ND
2015-06-03ND
2015-07-15ND
2015-07-15ND
2015-07-15ND
2015-07-27ND
2015-07-27ND
2015-07-27ND
2015-07-27ND
2015-08-05ND
2015-08-05ND
2015-08-05ND
2015-09-02ND
2015-09-02ND
2015-09-02ND
2015-10-21ND
2015-10-21ND
2015-10-21ND
2015-11-04ND
2015-11-04ND
2015-11-04ND
2015-12-16ND
2015-12-16ND
2015-12-16ND
2016-01-20ND
2016-01-20ND
2016-01-20ND
2016-02-03ND
2016-02-03ND
2016-02-03ND
2016-03-02ND
2016-03-02ND
2016-03-02ND
2016-05-19ND
2016-06-15ND
2016-06-15ND
2016-06-15ND
2016-09-07ND
2016-09-07ND
2016-09-07ND
2016-10-05ND
2016-10-05ND
2016-10-05ND
2017-02-15ND
2017-02-15ND
2017-02-15ND
2017-06-07ND
2017-06-07ND
2017-06-07ND
2017-09-06ND
2017-09-06ND
2017-09-06ND
2017-11-15ND
2017-11-15ND
2017-11-15ND
2018-03-28ND
2018-03-28ND
2018-03-28ND
2018-05-16ND
2018-05-16ND
2018-05-16ND
2018-08-15ND
2018-08-15ND
2018-08-15ND
2018-10-30ND
2018-10-30ND
2018-10-30ND
2019-03-20ND
2019-03-20ND
2019-03-20ND
2019-06-17ND
2019-06-17ND
2019-06-17ND
2019-07-17ND
2019-07-17ND
2019-07-17ND
2019-11-05ND
2019-11-05ND
2019-11-05ND