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EWG's Tap Water Database — 2019 UPDATE

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Chloromethane

California Water Service Company - Hermosa / Redondo Beach

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.

 

15

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND10ND
2013ND10ND
2014N/A00N/A
2015ND120ND
2016ND10ND
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
2012-08-089590-001-1345ND
2013-08-079590-001-1247ND
2015-02-11201502120146AMND
2015-02-11201502110688AMND
2015-02-11201502120094AMND
2015-02-11201502120107AMND
2015-05-06201505070045AMND
2015-05-06201505070032AMND
2015-08-06201508060776AMND
2015-08-06201508060791AMND
2015-08-20201508200602AMND
2015-08-20201508200651AMND
2015-11-04201511040806AMND
2015-11-04201511040748AMND
2016-08-179590-001-1010ND