Chloromethane
Prattsville 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.
11
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 | N/A | 0 | 0 | N/A |
| 2020 | 0.970 ppb | 1 | 1 | 0.970 ppb |
| 2021 | 2.90 ppb | 2 | 2 | 0.990 ppb - 4.80 ppb |
| 2022 | 1.99 ppb | 4 | 3 | ND - 4.70 ppb |
| 2023 | ND | 4 | 0 | ND |
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 |
|---|---|---|
| 2020-07-09 | CG31073-POC | 0.970 ppb |
| 2021-06-01 | CI41868 | 4.80 ppb |
| 2021-12-02 | CJ89169 | 0.990 ppb |
| 2022-03-24 | CK94265-POC | 4.70 ppb |
| 2022-05-04 | CL23008 | 2.50 ppb |
| 2022-08-11 | CM03438-POC | ND |
| 2022-10-06 | CM51426 | 0.740 ppb |
| 2023-03-02 | CN52181-POC | ND |
| 2023-05-04 | CN98335-POC | ND |
| 2023-08-03 | CO66019 | ND |
| 2023-11-02 | CP40215-POC | ND |