Chloromethane
Caddo Lake Water Supply Corporation
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.
12
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 | 0.880 ppb | 2 | 1 | ND - 1.76 ppb |
| 2019 | 1.66 ppb | 2 | 1 | ND - 3.31 ppb |
| 2020 | 1.43 ppb | 2 | 1 | ND - 2.85 ppb |
| 2021 | 1.13 ppb | 2 | 1 | ND - 2.26 ppb |
| 2022 | 0.635 ppb | 2 | 1 | ND - 1.27 ppb |
| 2023 | 0.965 ppb | 2 | 1 | ND - 1.93 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 |
|---|---|---|
| 2018-09-20 | Q1837726002 | ND |
| 2018-09-20 | Q1837726003 | 1.76 ppb |
| 2019-06-10 | Q1933418005 | ND |
| 2019-06-10 | Q1933418007 | 3.31 ppb |
| 2020-10-22 | Q2041223001 | ND |
| 2020-10-22 | Q2041223003 | 2.85 ppb |
| 2021-05-24 | Q2113525008 | 2.26 ppb |
| 2021-05-24 | Q2113525010 | ND |
| 2022-11-22 | Q2235079008 | 1.27 ppb |
| 2022-11-22 | Q2235079010 | ND |
| 2023-06-29 | Q2325157001 | ND |
| 2023-06-29 | Q2325157003 | 1.93 ppb |