Chloromethane
Town of Westernport
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.
3
Samples
0
Samples exceeding legal limit (MCL)
2
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 | N/A | 0 | 0 | N/A |
| 2020 | 9.99 ppb | 1 | 1 | 9.99 ppb |
| 2021 | 5.78 ppb | 1 | 1 | 5.78 ppb |
| 2022 | 1.79 ppb | 1 | 1 | 1.79 ppb |
| 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 |
|---|---|---|
| 2020-06-02 | E20003723001 | 9.99 ppb |
| 2021-06-15 | E21003716001 | 5.78 ppb |
| 2022-04-28 | E2201037501 | 1.79 ppb |