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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Westchester County Water District #1

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.

 

9

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND10ND
2015N/A00N/A
2016ND20ND
2017ND20ND
2018ND20ND
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
2014-12-01AQ24568POCND
2016-09-06AS19150 POC WD#1ND
2016-09-06AG19152 POC WD#1ND
2017-11-13AT23824POCSND
2017-11-13AT23822POCSND
2018-09-24AU20757WD1 POCSND
2018-09-24AU20758WD1 POCSND
2019-11-12AV23849D POCSND
2019-11-12AV23850D POCSND