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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Golden State Water Company (GSWC) - Norwalk

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.

 

12

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND40ND
2014ND80ND
2015N/A00N/A
2016N/A00N/A
2017N/A00N/A
2018N/A00N/A
2019N/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
2013-10-18201310180541AMND
2013-10-18201310180545AMND
2013-10-18201310180543AMND
2013-10-18201310180547AMND
2014-01-17201401180029AMND
2014-01-17201401180031AMND
2014-04-17201404180109AMND
2014-04-17201404180113AMND
2014-04-17201404180111AMND
2014-04-17201404180115AMND
2014-06-04201406050293AMND
2014-07-17201407170807AMND