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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Grafton Water District

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

 

64

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND90ND
2015ND160ND
2016ND90ND
2017ND90ND
2018ND90ND
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
2014-01-29ND
2014-04-07ND
2014-05-12ND
2014-05-12ND
2014-05-12ND
2014-05-12ND
2014-05-12ND
2014-07-15ND
2014-11-03ND
2015-01-21ND
2015-03-16ND
2015-03-16ND
2015-03-16ND
2015-04-14ND
2015-04-14ND
2015-04-14ND
2015-04-14ND
2015-04-14ND
2015-04-27ND
2015-07-14ND
2015-09-22ND
2015-09-22ND
2015-09-22ND
2015-10-21ND
2015-11-09ND
2016-02-02ND
2016-04-14ND
2016-04-14ND
2016-04-14ND
2016-04-14ND
2016-04-14ND
2016-06-09ND
2016-07-20ND
2016-10-07ND
2017-02-22ND
2017-02-22ND
2017-05-03ND
2017-05-03ND
2017-05-03ND
2017-05-31ND
2017-05-31ND
2017-05-31ND
2017-10-17ND
2018-02-14ND
2018-04-19ND
2018-04-19ND
2018-04-19ND
2018-04-19ND
2018-04-19ND
2018-06-27ND
2018-08-02ND
2018-11-06ND
2019-01-16ND
2019-02-26ND
2019-05-08ND
2019-05-08ND
2019-05-08ND
2019-05-20ND
2019-05-28ND
2019-05-28ND
2019-08-06ND
2019-08-20ND
2019-09-04ND
2019-10-22ND