Chloromethane
Fort Detrick
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.
4
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 | 0.690 ppb | 1 | 1 | 0.690 ppb |
| 2020 | 3.94 ppb | 1 | 1 | 3.94 ppb |
| 2021 | 4.86 ppb | 1 | 1 | 4.86 ppb |
| 2022 | 4.00 ppb | 1 | 1 | 4.00 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 |
|---|---|---|
| 2019-04-16 | E19003478004 | 0.690 ppb |
| 2020-06-15 | E20003853001 | 3.94 ppb |
| 2021-07-13 | E22000137001 | 4.86 ppb |
| 2022-06-30 | E2300000906 | 4.00 ppb |