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EWG's Tap Water Database — 2019 UPDATE

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Chloromethane

Layton City Water 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.

 

10

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
2013ND10ND
20145.65 ppb41ND - 22.6 ppb
2015ND50ND
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 Result
2013-12-13ND
2014-03-1122.6 ppb
2014-04-09ND
2014-04-09ND
2014-06-12ND
2015-03-26ND
2015-10-15ND
2015-10-15ND
2015-10-15ND
2015-12-17ND