Chloromethane
Town of Oakland
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)
8
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 | 6.23 ppb | 2 | 2 | 5.76 ppb - 6.69 ppb |
| 2020 | 6.39 ppb | 2 | 2 | 3.42 ppb - 9.36 ppb |
| 2021 | 7.59 ppb | 2 | 2 | 7.00 ppb - 8.18 ppb |
| 2022 | 6.92 ppb | 2 | 2 | 6.05 ppb - 7.79 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 |
|---|---|---|
| 2019-07-16 | E20000191006 | 5.76 ppb |
| 2019-07-16 | E20000191008 | 6.69 ppb |
| 2020-06-02 | E20003723004 | 9.36 ppb |
| 2020-06-23 | E20003928006 | 3.42 ppb |
| 2021-06-08 | E21003626004 | 7.00 ppb |
| 2021-06-08 | E21003626006 | 8.18 ppb |
| 2022-06-09 | E2201077004 | 7.79 ppb |
| 2022-06-09 | E2201077006 | 6.05 ppb |