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EWG's Tap Water Database — 2019 UPDATE

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Chloromethane

New York City System

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.

 

15

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
2013ND30ND
2014ND90ND
2015ND30ND
2016N/A00N/A
2017N/A00N/A

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
2013-12-10201312110816AMND
2013-12-10201312110609AMND
2013-12-10201312110762AMND
2014-03-11201403120580AMND
2014-03-11201403120478AMND
2014-03-11201403120608AMND
2014-06-24201406250133AMND
2014-06-24201406250381AMND
2014-06-24201406250127AMND
2014-09-23201409240402AMND
2014-09-23201409240447AMND
2014-09-23201409240450AMND
2015-06-25201505020407AMND
2015-09-23201508080112AMND
2015-12-08201511070106AMND