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EWG's Tap Water Database — 2019 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.

 

27

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND50ND
2013ND80ND
2014ND40ND
2015ND50ND
2016ND50ND
2017N/A00N/A

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
2012-08-16113258.01ND
2012-10-23115341.01ND
2012-10-23115341.02ND
2012-10-23115341.03ND
2012-10-23115341.04ND
2013-03-18710208-8344ND
2013-06-10724541-9139ND
2013-09-09743145-9691ND
2013-10-23125755.01ND
2013-10-23125755.02ND
2013-10-23125755.03ND
2013-10-23125755.04ND
2013-12-10762350-10420ND
2014-10-31137495.03ND
2014-10-31137495.02ND
2014-10-31137495.01ND
2014-10-31137495.04ND
2015-08-07146612.01ND
2015-10-15149110.03ND
2015-10-15149110.02ND
2015-10-15149110.01ND
2015-10-15149110.04ND
2016-08-05159131.01ND
2016-10-07161374.02ND
2016-10-07161374.03ND
2016-10-07161374.04ND
2016-10-07161374.05ND