Chloromethane
South Grafton 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.
27
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 | 2.00 ppb | 3 | 3 | 1.80 ppb - 2.10 ppb |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | 0.178 ppb | 4 | 1 | ND - 0.710 ppb |
| 2023 | 0.0500 ppb | 20 | 2 | ND - 0.500 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 | Result |
|---|---|
| 2018-01-08 | 1.80 ppb |
| 2018-04-02 | 2.10 ppb |
| 2018-04-02 | 2.10 ppb |
| 2022-08-01 | 0.710 ppb |
| 2022-09-06 | ND |
| 2022-10-03 | ND |
| 2022-11-07 | ND |
| 2023-02-06 | ND |
| 2023-02-06 | ND |
| 2023-03-06 | ND |
| 2023-03-06 | ND |
| 2023-04-03 | ND |
| 2023-04-03 | ND |
| 2023-05-01 | ND |
| 2023-05-01 | ND |
| 2023-05-01 | ND |
| 2023-06-12 | ND |
| 2023-06-12 | ND |
| 2023-07-10 | ND |
| 2023-07-10 | ND |
| 2023-08-07 | 0.500 ppb |
| 2023-08-07 | 0.500 ppb |
| 2023-09-05 | ND |
| 2023-09-05 | ND |
| 2023-10-02 | ND |
| 2023-11-06 | ND |
| 2023-12-04 | ND |