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EWG's Tap Water Database — 2019 UPDATE

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Chloromethane

Olivenhain Municipal 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.

 

14

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND10ND
2013ND50ND
2014ND50ND
2015ND10ND
2016ND10ND
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
2012-08-219590-003-0850ND
2013-08-209590-003-1200ND
2013-08-21201308220237AMND
2013-08-21201308220206AMND
2013-11-21201311220598AMND
2013-11-21201311220614AMND
2014-02-12201402130485AMND
2014-02-12201402130504AMND
2014-05-28201405290360AMND
2014-05-28201405290364AMND
2014-08-209590-003-1330ND
2015-08-199590-003-1221ND
2016-08-179590-003-1100ND
2017-08-249590-003-0900ND