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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

City of Santa Clara

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

 

82

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND180ND
2014ND170ND
2015ND140ND
2016ND100ND
2017ND50ND
2018ND90ND
2019ND90ND

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
2013-02-13201302140618AMND
2013-02-13201302140616AMND
2013-02-13201302140617AMND
2013-02-14201302150361AMND
2013-02-14201302150364AMND
2013-02-20201302210565AMND
2013-02-25201302260057AMND
2013-02-25201302260063AMND
2013-02-25201302260061AMND
2013-08-12201308130009AMND
2013-08-13201308140243AMND
2013-08-14201308150316AMND
2013-08-15201308160366AMND
2013-08-19201308200176AMND
2013-08-21201308220115AMND
2013-08-21201308220117AMND
2013-09-04201309050304AMND
2013-09-04201309050302AMND
2014-02-19201402200269AMND
2014-02-19201402200264AMND
2014-02-19201402200272AMND
2014-02-20201402210206AMND
2014-02-20201402210204AMND
2014-03-17201403190585AMND
2014-04-029590-030-1035ND
2014-05-14201405150113AMND
2014-05-14201405150111AMND
2014-08-269590-034-0930ND
2014-08-269590-027-1050ND
2014-08-279590-036-1030ND
2014-08-279590-011-0905ND
2014-08-28201408290716AMND
2014-08-28201408290714AMND
2014-11-13201411150193AMND
2014-11-13201411150195AMND
2015-02-18201502190872AMND
2015-02-18201502190874AMND
2015-02-18201502190870AMND
2015-02-18201502190878AMND
2015-02-18201502190868AMND
2015-02-18201502190876AMND
2015-08-179590-004-0925ND
2015-08-179590-019-1045ND
2015-08-199590-002-0955ND
2015-08-199590-015-1100ND
2015-08-209590-007-1120ND
2015-08-209590-031-1010ND
2015-08-249590-014-1045ND
2015-08-249590-013-0950ND
2016-08-159590-018-0915ND
2016-08-159590-016-1010ND
2016-08-159590-010-1055ND
2016-08-179590-005-1127ND
2016-08-179590-025-0918ND
2016-08-179590-029-1016ND
2016-08-189590-012-1035ND
2016-08-189590-008-0956ND
2016-08-189590-023-0920ND
2016-09-289590-026-0855ND
2017-04-249590-030-1120ND
2017-08-169590-027-1012ND
2017-08-169590-011-0901ND
2017-08-179590-036-1055ND
2017-10-049590-034-1007ND
2018-01-239590-022-1010ND
2018-08-139590-004-0908ND
2018-08-139590-026-1047ND
2018-08-169590-002-1000ND
2018-08-169590-031-0900ND
2018-08-209590-013-1005ND
2018-08-209590-014-0840ND
2018-08-209590-019-1042ND
2018-09-129590-007-1011ND
2019-08-149590-022-0905ND
2019-08-149590-030-1002ND
2019-08-209590-008-0945ND
2019-08-209590-018-1115ND
2019-08-209590-023-1200ND
2019-08-219590-016-1009ND
2019-08-219590-029-0905ND
2019-08-229590-010-0920ND
2019-10-019590-012-1031ND