Chloromethane
Ten Mile and Pleasant Valley Wua
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.
8
Samples
0
Samples exceeding legal limit (MCL)
3
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | ND | 1 | 0 | ND |
| 2020 | 24.6 ppb | 1 | 1 | 24.6 ppb |
| 2021 | 5.77 ppb | 5 | 2 | ND - 19.0 ppb |
| 2022 | ND | 1 | 0 | ND |
| 2023 | N/A | 0 | 0 | N/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 |
|---|---|---|
| 2019-10-21 | 1910208-01 | ND |
| 2020-11-16 | 2011146-01 | 24.6 ppb |
| 2021-01-07 | 2101100-01 | 19.0 ppb |
| 2021-03-24 | 2103214-01 | 9.83 ppb |
| 2021-06-16 | 2106250-01 | ND |
| 2021-10-08 | 2110131-01 | ND |
| 2021-12-07 | 2112072-01 | ND |
| 2022-03-08 | 2203099-01 | ND |