Know Your Environment. Protect Your Health.

Chloromethane

King County Water District No 90

NOTE: King County Water District No 90 purchases water from Seattle Public Utilities which is required to test for chloromethane. Sample information shown below was taken by Seattle Public Utilities.

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)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND30ND
2015ND30ND
2016N/A00N/A
2017N/A00N/A
2018N/A00N/A
2019N/A00N/A
2020N/A00N/A
2021N/A00N/A
2022ND10ND
2023ND20ND

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

NOTE: King County Water District No 90 purchases water from Seattle Public Utilities which is required to test for chloromethane. Sample information shown below was taken by Seattle Public Utilities.

Date Lab ID Result
2015-01-13201501140525AMND
2015-01-13201501140778AMND
2015-04-06201504070229AMND
2015-04-06201504070359AMND
2015-07-22201507230482AMND
2015-07-22201507230496AMND
2015-10-13201509280091AMND
2015-10-13201509280090AMND
2023-08-154542962ND
2023-08-154542961ND