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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Nob Hill Water Association

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
20140.0606 ppb51ND - 0.303 ppb
2015ND70ND
2016ND10ND
2017N/A00N/A
2018ND10ND
2019N/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
2014-04-21WA97-SE1-14-07090.303 ppb
2014-04-21WA97-SE1-14-0709ND
2014-04-21WA97-SE1-14-0709ND
2014-09-09WA97-SE1-14-1795ND
2014-09-09WA97-SE1-14-1795ND
2015-05-14WA97-SE2-15-0960ND
2015-05-14WA97-SE1-15-0960ND
2015-06-2375103ND
2015-07-1475167ND
2015-09-0175402ND
2015-10-06WA97-SE2-15-2166ND
2015-10-06WA97-SE2-15-2166ND
2016-07-12ND
2018-06-06ND