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EWG's Tap Water Database — 2019 UPDATE

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Chloromethane

City of Redmond 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.

 

22

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND10ND
2013ND40ND
2014ND90ND
2015ND40ND
2016ND30ND
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
2012-07-1627093ND
2013-07-1709477ND
2013-07-1709475ND
2013-07-1709476ND
2013-07-1709478ND
2014-06-25A4E1998-21AND
2014-06-25A4E1998-01AND
2014-06-25A4E1998-11AND
2014-06-25A4E1998-16AND
2014-09-24A4H1630-01AND
2014-12-17A4K1345-01AND
2014-12-17A4K1345-11AND
2014-12-17A4K1348-01AND
2014-12-17A4K1345-06AND
2015-03-04A5B1435-01AND
2015-07-2211484ND
2015-08-18A5G2132-01AND
2015-12-15A5K1615-01AND
2016-07-11ND
2016-07-11ND
2016-07-11ND
2017-11-29ND