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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Sierra Madre Water Department

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
2013ND40ND
2014ND50ND
2015ND50ND
2016ND50ND
2017ND50ND
2018ND50ND
2019ND50ND

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
2013-06-133F14032-02AND
2013-06-133F14032-01AND
2013-12-233L23104-01AND
2013-12-233L23104-03AND
2014-05-129588-007-1125ND
2014-05-129588-006-1055ND
2014-05-129588-005-1105ND
2014-05-129588-004-1045ND
2014-05-129588-003-1030ND
2015-05-139588-003-1115ND
2015-05-139588-004-1000ND
2015-05-139588-005-0940ND
2015-05-139588-007-0840ND
2015-05-139588-006-1020ND
2016-05-039588-003-0815ND
2016-05-039588-007-0920ND
2016-05-039588-004-0845ND
2016-05-039588-005-0830ND
2016-05-039588-006-0900ND
2017-05-039588-005-0930ND
2017-05-039588-003-1030ND
2017-05-039588-004-1045ND
2017-05-039588-007-1010ND
2017-05-039588-006-0940ND
2018-05-039588-007-1050ND
2018-05-039588-005-1030ND
2018-05-039588-004-1110ND
2018-05-039588-006-1040ND
2018-05-039588-003-1100ND
2019-05-089588-007-0940ND
2019-05-089588-005-1000ND
2019-05-089588-004-1010ND
2019-05-089588-006-1015ND
2019-05-089588-003-0950ND