Chloromethane
Norphlet 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.
11
Samples
0
Samples exceeding legal limit (MCL)
1
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | 1.14 ppb | 4 | 4 | 0.550 ppb - 1.65 ppb |
| 2019 | 1.16 ppb | 3 | 3 | 1.05 ppb - 1.28 ppb |
| 2020 | 2.84 ppb | 1 | 1 | 2.84 ppb |
| 2021 | 2.19 ppb | 1 | 1 | 2.19 ppb |
| 2022 | 0.860 ppb | 2 | 1 | ND - 1.72 ppb |
| 2023 | N/A | 0 | 0 | N/A |
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 |
|---|---|---|
| 2018-02-26 | 18060002201 | 0.550 ppb |
| 2018-04-30 | 18123005501 | 0.930 ppb |
| 2018-07-10 | 18193006501 | 1.65 ppb |
| 2018-10-29 | 18305001801 | 1.42 ppb |
| 2019-02-19 | 19052004401 | 1.05 ppb |
| 2019-02-19 | 19052004301 | 1.16 ppb |
| 2019-07-15 | 19198002501 | 1.28 ppb |
| 2020-07-20 | 20204000301 | 2.84 ppb |
| 2021-08-10 | 21224007101 | 2.19 ppb |
| 2022-01-24 | 22027007101 | ND |
| 2022-08-16 | O200995-VOC-1 | 1.72 ppb |