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EWG's Tap Water Database — 2019 UPDATE

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Chloromethane

PUD #1 of Asotin County

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.

 

13

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND70ND
2013N/A00N/A
2014ND60ND
2015N/A00N/A
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
2012-08-2174925ND
2012-08-2174927ND
2012-08-2174919ND
2012-08-2174921ND
2012-08-2174917ND
2012-08-2174923ND
2012-08-2274945ND
2014-01-14140115033-003ND
2014-01-14140115033-001ND
2014-01-14140115033-002ND
2014-07-24140725002-003ND
2014-07-24140725002-001ND
2014-07-24140725002-002ND