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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Montebello Land & Water Company

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
2014ND50ND
2015ND10ND
2016ND60ND
2017ND70ND
2018ND80ND
2019ND70ND

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
2014-06-26201406280074AMND
2014-06-26201406280072AMND
2014-06-26201406280076AMND
2014-12-18201412190371AMND
2014-12-18201412190373AMND
2015-07-30201507310207AMND
2016-02-249588-007-1020ND
2016-03-119588-001-1015ND
2016-08-259588-003-0845ND
2016-08-259588-008-0835ND
2016-08-259588-005-0820ND
2016-11-229588-004-0850ND
2017-02-219588-007-0925ND
2017-02-219588-001-0900ND
2017-06-149588-009-1025ND
2017-08-309588-003-0905ND
2017-08-309588-008-0850ND
2017-08-309588-005-0915ND
2017-10-139588-004-0855ND
2018-02-169588-001-0900ND
2018-03-299588-007-0845ND
2018-05-299588-007-0915ND
2018-05-299588-009-0930ND
2018-08-159588-008-1150ND
2018-08-159588-003-1200ND
2018-08-159588-005-1130ND
2018-11-149588-004-0900ND
2019-02-219588-008-0835ND
2019-02-219588-007-0915ND
2019-02-219588-009-0930ND
2019-02-219588-003-0830ND
2019-02-219588-005-0850ND
2019-02-289588-001-1015ND
2019-05-029588-004-0815ND