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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Marion Waterworks

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

 

30

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND20ND
2014ND70ND
2015ND80ND
2016ND20ND
2017ND30ND
2018ND60ND
2019ND20ND

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
2013-06-10O131640080ND
2013-12-11O133460009ND
2014-04-0714100000501ND
2014-07-1414198000601ND
2014-07-1414198000701ND
2014-07-1414198000501ND
2014-11-1014316000601ND
2014-11-1014316000501ND
2014-11-2414330004001ND
2015-01-2715029007302ND
2015-01-2715029007401ND
2015-06-0915161003001ND
2015-06-0915161002901ND
2015-09-1615260000309ND
2015-09-1615260000409ND
2015-09-1615260000509ND
2015-11-1915324001609ND
2016-02-1516049004901ND
2016-07-1216196006901ND
2017-01-1617019008201ND
2017-08-0117215002201ND
2017-12-0617341002009ND
2018-01-1818019004206ND
2018-01-1818019004301ND
2018-04-1018101008309ND
2018-08-1518228001309ND
2018-08-1518228001409ND
2018-08-1518228001209ND
2019-01-0719010014901ND
2019-07-3019212004401ND