Know Your Environment. Protect Your Health.

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.

 

17

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
2015ND40ND
2016N/A00N/A
2017N/A00N/A
2018ND10ND
2019N/A00N/A
2020N/A00N/A
2021ND20ND
2022ND50ND
2023N/A00N/A

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

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-SE1-14-07099-17188ND
2014-04-21WA97-SE1-14-07099-17190ND
2014-04-21WA97-SE1-14-07099-171890.303 ppb
2014-09-09WA97-SE1-14-17950-41046ND
2014-09-09WA97-SE1-14-17950-41045ND
2015-05-14WA97-SE2-15-09609-21837ND
2015-05-14WA97-SE1-15-09609-21836ND
2015-10-06WA97-SE2-15-21669-48260ND
2015-10-06WA97-SE2-15-21669-48259ND
2018-06-06ND
2021-07-074146288ND
2021-07-074146287ND
2022-03-214258505ND
2022-06-064298839ND
2022-08-154327034ND
2022-09-144344892ND
2022-10-114356385ND