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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Aurora, City of

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

 

36

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND30ND
2015ND80ND
2016ND50ND
2017ND70ND
2018ND70ND
2019ND60ND

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
2014-06-02294484ND
2014-06-02294483ND
2014-10-07328655ND
2015-01-19343365ND
2015-01-26343366ND
2015-01-26343367ND
2015-04-13353486ND
2015-04-13353655ND
2015-04-13353656ND
2015-08-17382676ND
2015-10-14392088ND
2016-01-20ND
2016-04-11ND
2016-04-18ND
2016-07-05ND
2016-10-18ND
2017-01-25ND
2017-03-07ND
2017-04-17ND
2017-06-12ND
2017-07-17ND
2017-09-11ND
2017-10-11ND
2018-01-02530775ND
2018-02-12530776ND
2018-04-02542343ND
2018-04-02542344ND
2018-04-30542345ND
2018-07-10560172ND
2018-10-15577021ND
2019-01-14590564ND
2019-04-08604133ND
2019-04-15607671ND
2019-07-08621122ND
2019-10-07638520ND
2019-11-18638521ND