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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Monticello Water Department

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
2013ND20ND
2014ND30ND
2015ND30ND
2016ND70ND
2017ND40ND
2018ND30ND
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
2013-03-12O130720001ND
2013-09-09O132550025ND
2014-04-2214113000901ND
2014-07-1414198008801ND
2014-11-0314310002301ND
2015-05-2615148008001ND
2015-08-0315218000309ND
2015-11-0415309004101ND
2016-01-2016025000301ND
2016-01-2016025000601ND
2016-01-2016025000501ND
2016-01-2016025000401ND
2016-05-0316126016309ND
2016-07-2716210002001ND
2016-11-0816314002501ND
2017-05-3017152006201ND
2017-07-3117215005101ND
2017-11-0617312001701ND
2017-11-0617312000201ND
2018-05-0818130005401ND
2018-08-2718242002401ND
2018-10-3018305001001ND
2019-02-2019052003901ND
2019-02-2019052004001ND
2019-02-2019052003801ND
2019-02-2019052003701ND
2019-04-3019121003808ND
2019-09-1619261001508ND
2019-11-2519330001501ND