Know Your Environment. Protect Your Health.

Chloromethane

Hanson Water Department

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.

 

26

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND60ND
2019ND60ND
2020ND50ND
20213.51 ppb71ND - 24.6 ppb
2022ND10ND
2023ND10ND

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 Result
2018-02-26ND
2018-06-11ND
2018-06-11ND
2018-06-11ND
2018-08-27ND
2018-11-26ND
2019-02-11ND
2019-06-03ND
2019-06-03ND
2019-06-03ND
2019-08-20ND
2019-11-18ND
2020-01-29ND
2020-06-10ND
2020-06-10ND
2020-06-10ND
2020-10-06ND
2021-02-1724.6 ppb
2021-05-12ND
2021-05-12ND
2021-06-28ND
2021-08-05ND
2021-08-09ND
2021-12-07ND
2022-05-04ND
2023-05-30ND