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EWG's Tap Water Database — 2019 UPDATE

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Chloromethane

Lafayette

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.

 

24

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND20ND
2013ND20ND
2014ND20ND
2015ND140ND
2016ND20ND
2017ND20ND

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
2012-05-08AH59996ND
2012-05-08AH59995ND
2013-05-21AI02050ND
2013-05-21AI02051ND
2014-05-14AI40538ND
2014-05-14AI40539ND
2015-03-163206839ND
2015-03-163206861ND
2015-03-173208194ND
2015-04-07AI74280ND
2015-04-07AI74279ND
2015-06-093258220ND
2015-06-113260394ND
2015-06-153262291ND
2015-09-013313007ND
2015-09-013313029ND
2015-09-023314395ND
2015-12-073370089ND
2015-12-073370075ND
2015-12-093372177ND
2016-05-11AJ12003ND
2016-05-11AJ12002ND
2017-06-21AJ58196ND
2017-06-21AJ58195ND