Chloromethane
Cape Windsor Community Association Inc.
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.
9
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 | 1.88 ppb | 1 | 1 | 1.88 ppb |
| 2019 | 1.07 ppb | 2 | 2 | 0.810 ppb - 1.32 ppb |
| 2020 | 0.740 ppb | 1 | 1 | 0.740 ppb |
| 2021 | 1.05 ppb | 2 | 1 | ND - 2.09 ppb |
| 2022 | 4.50 ppb | 2 | 2 | 0.870 ppb - 8.12 ppb |
| 2023 | ND | 1 | 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 |
|---|---|---|
| 2018-11-27 | S816887 | 1.88 ppb |
| 2019-02-15 | S866438 | 0.810 ppb |
| 2019-09-04 | S895567 | 1.32 ppb |
| 2020-06-15 | S952730 | 0.740 ppb |
| 2021-03-19 | S1040928 | ND |
| 2021-07-28 | S1106627 | 2.09 ppb |
| 2022-06-24 | S1185352 | 8.12 ppb |
| 2022-07-29 | S1217151 | 0.870 ppb |
| 2023-12-20 | S1323291 | ND |