Chloromethane
Sammamish Plateau Water and Sewer
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.
19
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 |
|---|---|---|---|---|
| 2015 | ND | 13 | 0 | ND |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 2 | 0 | ND |
| 2019 | ND | 2 | 0 | ND |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | ND | 2 | 0 | ND |
| 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 |
|---|---|---|
| 2015-03-30 | 35181633003AM | ND |
| 2015-03-30 | 35181633005AM | ND |
| 2015-03-30 | 35181633007AM | ND |
| 2015-03-30 | 35181633001AM | ND |
| 2015-03-31 | 35181843001AM | ND |
| 2015-03-31 | 35181843003AM | ND |
| 2015-03-31 | 35181843005AM | ND |
| 2015-09-03 | 35205946001AM | ND |
| 2015-09-03 | 35205946007AM | ND |
| 2015-09-03 | 35205946005AM | ND |
| 2015-09-03 | 35205946009AM | ND |
| 2015-09-03 | 35205946003AM | ND |
| 2015-09-30 | 35209763001AM | ND |
| 2018-08-22 | ND | |
| 2018-08-22 | ND | |
| 2019-09-18 | ND | |
| 2019-10-30 | ND | |
| 2022-08-17 | 4365563 | ND |
| 2022-08-17 | 4365564 | ND |