Chloromethane
White Rock
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)
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 | 19.5 ppb | 1 | 1 | 19.5 ppb |
| 2020 | 9.03 ppb | 1 | 1 | 9.03 ppb |
| 2021 | 1.61 ppb | 1 | 1 | 1.61 ppb |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | 1.40 ppb | 1 | 1 | 1.40 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 |
|---|---|---|
| 2019-06-12 | E19004282001 | 19.5 ppb |
| 2020-06-11 | E20003821001 | 9.03 ppb |
| 2021-04-21 | E21002981001 | 1.61 ppb |
| 2023-05-09 | E2300276307 | 1.40 ppb |