Chloromethane
Town of Woodsboro
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.
6
Samples
0
Samples exceeding legal limit (MCL)
4
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 | 10.4 ppb | 3 | 3 | 8.89 ppb - 11.2 ppb |
| 2020 | 0.900 ppb | 1 | 1 | 0.900 ppb |
| 2021 | 5.15 ppb | 1 | 1 | 5.15 ppb |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | 0.850 ppb | 1 | 1 | 0.850 ppb |
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 |
|---|---|---|
| 2019-05-30 | E19004087001 | 11.0 ppb |
| 2019-05-30 | E19004087004 | 11.2 ppb |
| 2019-05-30 | E19004087006 | 8.89 ppb |
| 2020-09-28 | E21000861004 | 0.900 ppb |
| 2021-06-30 | E22000009001 | 5.15 ppb |
| 2023-08-29 | E2400077101 | 0.850 ppb |