Chloromethane
Highfield
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.
5
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 | 6.42 ppb | 2 | 2 | 6.15 ppb - 6.69 ppb |
| 2020 | 0.590 ppb | 1 | 1 | 0.590 ppb |
| 2021 | 2.56 ppb | 1 | 1 | 2.56 ppb |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | 2.08 ppb | 1 | 1 | 2.08 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 |
|---|---|---|
| 2019-09-05 | E20000966004 | 6.15 ppb |
| 2019-09-05 | E20000966006 | 6.69 ppb |
| 2020-03-18 | E20003196001 | 0.590 ppb |
| 2021-09-27 | E2200015901 | 2.56 ppb |
| 2023-07-05 | E2300344106 | 2.08 ppb |