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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Porter SUD

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
2013ND100ND
2014ND10ND
2015ND100ND
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
2013-05-21720751-8898ND
2013-05-21720766-8898ND
2013-05-21720738-8896ND
2013-05-21720774-8898ND
2013-06-17726337-9147ND
2013-11-18759135-10298ND
2013-11-18759143-10298ND
2013-11-18759228-10309ND
2013-11-18759167-10302ND
2013-11-18759149-10302ND
2014-07-08AC59005ND
2015-04-13AC87989ND
2015-04-13AC87995ND
2015-04-13AC87983ND
2015-04-13AC87991ND
2015-04-13AC88001ND
2015-04-13AC88005ND
2015-09-30AD09108ND
2015-09-30AD09106ND
2015-11-19AD14238ND
2015-11-19AD14236ND
2016-01-12AD17618ND
2016-01-12AD17620ND
2016-01-12AD17608ND
2016-01-12AD17602ND
2016-01-12AD17610ND
2017-01-19AD65761ND
2017-01-19AD65751ND
2017-01-19AD65767ND
2017-01-19AD65769ND
2017-10-11AE00408ND
2018-01-09AE08391ND
2018-01-09AE08367ND
2018-01-09AE08369ND
2018-01-09AE08409ND
2018-11-26AE46856ND
2019-01-23AE50957ND
2019-01-23AE50961ND
2019-01-23AE50955ND
2019-01-23AE50953ND
2019-01-23AE50951ND