Chloromethane
Houghton Water District
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)
0
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 | 1.60 ppb | 2 | 2 | 1.60 ppb |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | 1.60 ppb | 1 | 1 | 1.60 ppb |
| 2022 | 1.30 ppb | 1 | 1 | 1.30 ppb |
| 2023 | 1.85 ppb | 2 | 2 | 1.50 ppb - 2.20 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 |
|---|---|---|
| 2019-06-04 | EHS1900029625-SR-2 | 1.60 ppb |
| 2019-06-06 | EHS1900029625POCS | 1.60 ppb |
| 2021-10-05 | R2110480-001 | 1.60 ppb |
| 2022-11-02 | R2210597-001 | 1.30 ppb |
| 2023-03-22 | R2302459-001 | 1.50 ppb |
| 2023-06-07 | R2305065-001 | 2.20 ppb |