Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Chloromethane

Park WC - Lynwood

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

 

29

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND40ND
2015ND110ND
2016ND40ND
2017ND20ND
20180.190 ppb41ND - 0.760 ppb
2019ND40ND

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
2014-02-139588-005-1010ND
2014-05-299588-005-1130ND
2014-08-219588-005-1330ND
2014-11-129588-005-1315ND
2015-01-23201501230226AMND
2015-01-23201501230292AMND
2015-01-23201501230287AMND
2015-02-269588-005-1230ND
2015-04-24201504240365AMND
2015-05-089588-005-1150ND
2015-07-20201507200370AMND
2015-07-20201507200366AMND
2015-08-059588-005-0915ND
2015-10-30201510300317AMND
2015-11-199588-005-1035ND
2016-04-149588-005-0945ND
2016-05-259588-005-1030ND
2016-08-049588-005-1210ND
2016-11-159588-005-0925ND
2017-02-239588-005-1315ND
2017-11-309588-005-0945ND
2018-02-279588-005-1230ND
2018-05-119588-005-1000ND
2018-08-169588-005-0715ND
2018-11-089588-005-10300.760 ppb
2019-02-139588-005-0930ND
2019-05-159588-005-0930ND
2019-08-139588-005-0945ND
2019-11-129588-005-1450ND