Chloromethane
Midland-lonaconing
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.
18
Samples
0
Samples exceeding legal limit (MCL)
7
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | ND | 8 | 0 | ND |
| 2015 | ND | 1 | 0 | ND |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | 25.2 ppb | 3 | 3 | 19.0 ppb - 28.4 ppb |
| 2020 | 7.61 ppb | 3 | 3 | 6.96 ppb - 8.78 ppb |
| 2021 | 2.51 ppb | 3 | 3 | 1.27 ppb - 4.89 ppb |
| 2022 | N/A | 0 | 0 | N/A |
| 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 |
|---|---|---|
| 2014-03-04 | 105920P | ND |
| 2014-03-05 | 105919P | ND |
| 2014-06-02 | 107600P | ND |
| 2014-06-02 | 107599P | ND |
| 2014-09-09 | 109066P | ND |
| 2014-09-09 | 109065P | ND |
| 2014-12-03 | 110719P | ND |
| 2014-12-03 | 110718P | ND |
| 2015-05-11 | 111250R | ND |
| 2019-07-02 | E20000037008 | 19.0 ppb |
| 2019-07-02 | E20000037006 | 28.3 ppb |
| 2019-07-02 | E20000037004 | 28.4 ppb |
| 2020-05-27 | E20003665006 | 8.78 ppb |
| 2020-05-27 | E20003665004 | 7.08 ppb |
| 2020-05-27 | E20003665001 | 6.96 ppb |
| 2021-06-15 | E21003716004 | 4.89 ppb |
| 2021-07-26 | E22000293004 | 1.27 ppb |
| 2021-07-26 | E22000293001 | 1.36 ppb |