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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Cal-water Service Company - Marysville

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

 

49

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND50ND
2014ND210ND
2015ND20ND
2016N/A00N/A
2017ND20ND
2018ND110ND
2019ND80ND

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
2013-08-06201308070478AMND
2013-08-06201308070399AMND
2013-08-06201308070410AMND
2013-08-12201308130203AMND
2013-08-14201308150251AMND
2014-02-11201402120400AMND
2014-02-11201402120580AMND
2014-02-11201402120457AMND
2014-02-12201402130455AMND
2014-02-25201402260645AMND
2014-02-25201402260631AMND
2014-04-08201404090534AMND
2014-04-08201404090608AMND
2014-05-015810-023-1123ND
2014-05-015810-011-1115ND
2014-06-235810-011-1436ND
2014-06-235810-023-1427ND
2014-08-115810-023-0946ND
2014-08-115810-011-0941ND
2014-10-01201410020294AMND
2014-10-01201410020280AMND
2014-10-209590-011-0916ND
2014-10-209590-013-1403ND
2014-12-229590-011-0954ND
2014-12-309590-023-1046ND
2014-12-309590-011-1043ND
2015-05-049590-011-0841ND
2015-05-049590-023-0846ND
2017-07-189590-013-1410ND
2017-07-189590-016-1350ND
2018-01-215810-013-0830ND
2018-04-095810-011-1019ND
2018-04-095810-023-1026ND
2018-04-169590-013-1006ND
2018-06-055810-023-1356ND
2018-06-055810-011-1347ND
2018-07-025810-011-0927ND
2018-07-025810-023-0934ND
2018-11-265810-015-1134ND
2018-12-035810-023-1015ND
2018-12-035810-011-1010ND
2019-01-085810-023-1410ND
2019-01-085810-011-1358ND
2019-01-219590-013-1050ND
2019-03-045810-023-1315ND
2019-03-045810-011-1323ND
2019-04-115810-013-1602ND
2019-05-065810-011-0944ND
2019-05-065810-023-0948ND