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
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | ND | 6 | 0 | ND |
| 2019 | ND | 6 | 0 | ND |
| 2020 | ND | 5 | 0 | ND |
| 2021 | 3.51 ppb | 7 | 1 | ND - 24.6 ppb |
| 2022 | ND | 1 | 0 | ND |
| 2023 | ND | 1 | 0 | ND |
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 |
|---|---|
| 2018-02-26 | ND |
| 2018-06-11 | ND |
| 2018-06-11 | ND |
| 2018-06-11 | ND |
| 2018-08-27 | ND |
| 2018-11-26 | ND |
| 2019-02-11 | ND |
| 2019-06-03 | ND |
| 2019-06-03 | ND |
| 2019-06-03 | ND |
| 2019-08-20 | ND |
| 2019-11-18 | ND |
| 2020-01-29 | ND |
| 2020-06-10 | ND |
| 2020-06-10 | ND |
| 2020-06-10 | ND |
| 2020-10-06 | ND |
| 2021-02-17 | 24.6 ppb |
| 2021-05-12 | ND |
| 2021-05-12 | ND |
| 2021-06-28 | ND |
| 2021-08-05 | ND |
| 2021-08-09 | ND |
| 2021-12-07 | ND |
| 2022-05-04 | ND |
| 2023-05-30 | ND |