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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

City of Sunnyvale

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
2014ND180ND
2015ND60ND
2016N/A00N/A
2017N/A00N/A
2018ND60ND
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
2014-02-05A4A1602-17AND
2014-02-05A4A1602-01AND
2014-02-05A4A1602-05AND
2014-02-05A4A1602-29AND
2014-02-05A4A1602-25AND
2014-02-05A4A1602-21AND
2014-05-14A4D2337-06AND
2014-05-14A4D2337-01AND
2014-08-13A4G2523-16AND
2014-08-13A4G2523-21AND
2014-08-13A4G2523-01AND
2014-08-13A4G2523-06AND
2014-08-13A4G2523-11AND
2014-08-13A4G2524-06AND
2014-08-13A4G2524-01AND
2014-08-13A4G2523-26AND
2014-11-12A4J1615-01AND
2014-11-12A4J1615-06AND
2015-02-115810-012-1205ND
2015-02-115810-010-1140ND
2015-02-115810-007-0945ND
2015-02-115810-004-1105ND
2015-02-115810-003-1046ND
2015-10-285810-008-1002ND
2018-03-145810-012-1027ND
2018-03-145810-010-0935ND
2018-03-145810-008-0810ND
2018-03-145810-007-0905ND
2018-03-145810-004-1115ND
2018-03-145810-003-1050ND