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EWG's Tap Water Database

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Chloromethane

Arapahoe Cnty Wwwa

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.

 

36

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2010ND70ND
2011ND40ND
2012ND70ND
2013ND10ND
2014ND160ND
2015ND10ND

ppb = parts per billion.

State and national drinking water standards and health guidelines

Health Guideline 2.69 ppb

The 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
2010-01-25ND
2010-01-25ND
2010-01-25ND
2010-02-01ND
2010-02-01ND
2010-04-05ND
2010-04-05ND
2011-01-19ND
2011-04-01ND
2011-04-01ND
2011-04-01ND
2012-01-13ND
2012-01-13ND
2012-01-23ND
2012-01-23ND
2012-04-06ND
2012-04-06ND
2012-04-09ND
2013-01-08ND
2014-05-06ND
2014-05-06ND
2014-05-06ND
2014-05-06ND
2014-05-06ND
2014-05-06ND
2014-05-06ND
2014-05-06ND
2014-11-10ND
2014-11-12ND
2014-11-17ND
2014-11-17ND
2014-11-17ND
2014-11-18ND
2014-11-19ND
2014-11-20ND
2015-06-25ND