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EWG's Tap Water Database — 2019 UPDATE

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Chloromethane

Boston Harbor

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.

 

14

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
2013N/A00N/A
2014N/A00N/A
2015ND120ND
2016ND10ND
2017ND10ND

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
2015-04-0115863ND
2015-04-0115863ND
2015-04-0115863ND
2015-05-0416373ND
2015-05-0416372ND
2015-09-1718579ND
2015-09-1718578ND
2015-10-2919346ND
2015-10-2919346ND
2015-10-2919347ND
2015-10-2919347ND
2015-12-1120103ND
2016-03-08ND
2017-03-22ND