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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

San Gabriel County WD

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

 

41

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND160ND
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
2014-03-244C24025-03AND
2014-03-244C24025-05AND
2014-03-244C24025-01AND
2014-03-244C24025-09AND
2014-03-244C24025-07AND
2014-04-089588-007-0940ND
2014-07-149588-009-0900ND
2014-07-149588-010-0915ND
2014-07-149588-011-0945ND
2014-07-159588-001-1000ND
2014-09-254I25045-07AND
2014-09-254I25045-09AND
2014-09-254I25045-01AND
2014-09-254I25045-03AND
2014-10-084J08065-01AND
2014-12-059588-020-0910ND
2015-03-179588-020-1050ND
2015-06-119588-007-0905ND
2015-07-169588-001-0940ND
2015-07-169588-011-1020ND
2015-07-169588-010-1000ND
2016-04-139588-007-0940ND
2016-07-189588-009-0925ND
2016-07-189588-011-0950ND
2016-07-189588-010-0935ND
2016-09-159588-020-0910ND
2017-04-139588-007-0925ND
2017-07-179588-010-0925ND
2017-07-179588-009-0905ND
2017-07-179588-011-0945ND
2017-07-179588-020-1025ND
2018-04-069588-007-0930ND
2018-07-189588-010-1045ND
2018-07-189588-009-1100ND
2018-07-189588-020-1010ND
2018-07-189588-011-1030ND
2019-04-109588-007-1015ND
2019-07-129588-010-1035ND
2019-07-129588-009-1045ND
2019-07-129588-020-1015ND
2019-07-129588-011-0950ND