Chloromethane
Lake Delton Waterworks
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.
16
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 | ND | 3 | 0 | ND |
| 2020 | 0.104 ppb | 7 | 1 | ND - 0.730 ppb |
| 2021 | ND | 1 | 0 | ND |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | ND | 5 | 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 |
|---|---|---|
| 2019-06-19 | 1129378 | ND |
| 2019-07-22 | 1135927 | ND |
| 2019-12-10 | 1164822 | ND |
| 2020-04-20 | 409868 | ND |
| 2020-05-28 | 424672 | ND |
| 2020-05-28 | 424675 | ND |
| 2020-05-28 | 424681 | ND |
| 2020-06-02 | 426799 | ND |
| 2020-06-02 | 426786 | ND |
| 2020-06-02 | 426789 | 0.730 ppb |
| 2021-01-20 | 526112 | ND |
| 2023-03-20 | 1301274 | ND |
| 2023-03-20 | 1301276 | ND |
| 2023-04-19 | 1316618 | ND |
| 2023-04-20 | 1316620 | ND |
| 2023-04-20 | 1316622 | ND |