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EWG's Tap Water Database — 2019 UPDATE

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Chloromethane

Los Angeles County WW District 40 Reg 38 Lake Los Angeles

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.

 

16

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND20ND
2013ND20ND
2014ND80ND
2015ND20ND
2016ND20ND
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
2012-06-055442-008-0830ND
2012-09-065442-003-1016ND
2013-06-185442-003-0848ND
2013-06-185442-008-0901ND
2014-01-15201401160354AMND
2014-01-15201401160352AMND
2014-04-14201404210015AMND
2014-06-175442-003-1117ND
2014-06-175442-008-1108ND
2014-07-09201407110417AMND
2014-07-09201407110429AMND
2014-10-08201410090507AMND
2015-06-225442-003-0915ND
2015-06-225442-008-0915ND
2016-05-125442-003-1055ND
2016-05-125442-008-0950ND