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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Golden State Water Company (GSWC) - Claremont

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.

MORE ABOUT THIS CONTAMINANT

 

30

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND150ND
2015ND130ND
2016ND10ND
2017N/A00N/A
2018N/A00N/A
2019ND10ND

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
2014-07-15201407150668AMND
2014-07-15201407150676AMND
2014-07-15201407150678AMND
2014-07-15201407150680AMND
2014-07-15201407150670AMND
2014-07-15201407150672AMND
2014-07-15201407150664AMND
2014-07-15201407150682AMND
2014-07-15201407150666AMND
2014-07-31201407310362AMND
2014-10-10201410100276AMND
2014-10-10201410100270AMND
2014-10-10201410100274AMND
2014-10-10201410100278AMND
2014-10-10201410100272AMND
2015-01-07201501070615AMND
2015-01-07201501070621AMND
2015-01-07201501070633AMND
2015-01-07201501070631AMND
2015-01-07201501070613AMND
2015-01-07201501070617AMND
2015-01-07201501070619AMND
2015-01-07201501070635AMND
2015-04-15201504150627AMND
2015-04-15201504150621AMND
2015-04-15201504150619AMND
2015-04-15201504150625AMND
2015-04-15201504150623AMND
2016-02-084790-047-0928ND
2019-10-239590-024-1042ND