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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

California Water Service (CWS) - Los Altos Suburban

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

 

34

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND250ND
2014ND20ND
2015N/A00N/A
2016ND10ND
2017N/A00N/A
2018ND30ND
2019ND30ND

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
2013-06-05201306060176AMND
2013-06-05201306060248AMND
2013-06-05201306060221AMND
2013-06-10201306110146AMND
2013-06-10201306110150AMND
2013-06-10201306110397AMND
2013-06-10201306110404AMND
2013-06-12201306130099AMND
2013-06-18201306190310AMND
2013-06-18201306190267AMND
2013-06-18201306190289AMND
2013-09-11201309120295AMND
2013-12-03201312040566AMND
2013-12-04201312050169AMND
2013-12-05201312060280AMND
2013-12-09201312100197AMND
2013-12-09201312100207AMND
2013-12-10201312110719AMND
2013-12-10201312110684AMND
2013-12-11201312120626AMND
2013-12-16201312170387AMND
2013-12-16201312170377AMND
2013-12-17201312180734AMND
2013-12-17201312180649AMND
2013-12-18201312200056AMND
2014-03-05201403060200AMND
2014-06-04201406050004AMND
2016-12-135810-028-1140ND
2018-12-125810-028-1535ND
2018-12-125810-008-1117ND
2018-12-129590-002-1400ND
2019-03-195810-028-1400ND
2019-08-205810-037-1115ND
2019-08-265810-024-1355ND