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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

San Jose Water Company

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

 

45

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND210ND
2014ND210ND
2015ND10ND
2016ND20ND
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
2013-08-052872053ND
2013-08-052872079ND
2013-08-052872002ND
2013-08-052872019ND
2013-08-052871986ND
2013-08-122877914ND
2013-08-192882261ND
2013-08-192882214ND
2013-08-192882285ND
2013-08-192883572ND
2013-08-192883561ND
2013-08-262887288ND
2013-08-262887322ND
2013-08-262886350ND
2013-08-262886361ND
2013-08-262886329ND
2013-08-272886940ND
2013-11-062927631ND
2013-11-062927620ND
2013-11-062927609ND
2013-11-062927655ND
2014-02-052970791ND
2014-02-072970644ND
2014-02-072970670ND
2014-02-072970770ND
2014-02-072970726ND
2014-02-072970693ND
2014-02-072970746ND
2014-02-072970710ND
2014-02-102973555ND
2014-02-102973465ND
2014-02-102973510ND
2014-02-102973315ND
2014-02-102973365ND
2014-02-102973546ND
2014-02-102973490ND
2014-03-132992690ND
2014-03-182994504ND
2014-05-053020655ND
2014-05-053020640ND
2014-05-093025984ND
2014-06-023037133ND
2015-02-113189329ND
2016-03-041610-005-1315ND
2016-04-011610-005-1140ND