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EWG's Tap Water Database — 2019 UPDATE

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Chloromethane

Newhall Cwd-pinetree

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.

 

11

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND50ND
2013ND30ND
2014ND20ND
2015N/A00N/A
2016N/A00N/A
2017ND10ND

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
2012-01-129590-001-1030ND
2012-02-099590-001-1155ND
2012-02-099590-003-1120ND
2012-02-099590-008-1100ND
2012-05-109590-001-0916ND
2013-02-149590-001-1025ND
2013-02-149590-003-1015ND
2013-02-149590-008-1034ND
2014-02-139590-003-1235ND
2014-02-139590-008-1300ND
2017-04-069590-008-0935ND