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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Concord 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

 

51

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND170ND
2015ND70ND
2016ND70ND
2017ND60ND
2018ND70ND
2019ND70ND

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
2014-01-16ND
2014-01-16ND
2014-01-16ND
2014-01-23ND
2014-01-23ND
2014-07-01ND
2014-07-07ND
2014-07-07ND
2014-07-09ND
2014-07-09ND
2014-07-09ND
2014-07-15ND
2014-07-15ND
2014-07-15ND
2014-07-28ND
2014-08-13ND
2014-08-25ND
2015-07-01ND
2015-07-15ND
2015-07-16ND
2015-07-16ND
2015-07-23ND
2015-09-14ND
2015-09-29ND
2016-07-26ND
2016-08-10ND
2016-08-18ND
2016-08-25ND
2016-08-25ND
2016-09-13ND
2016-09-29ND
2017-07-03ND
2017-07-31ND
2017-08-14ND
2017-08-25ND
2017-08-28ND
2017-09-18ND
2018-07-11ND
2018-07-16ND
2018-07-25ND
2018-07-26ND
2018-07-26ND
2018-08-28ND
2018-08-28ND
2019-07-01ND
2019-07-01ND
2019-07-03ND
2019-07-11ND
2019-07-26ND
2019-07-31ND
2019-09-18ND