Chloromethane
Miller Grove 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.
13
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 |
|---|---|---|---|---|
| 2018 | 0.255 ppb | 2 | 1 | ND - 0.510 ppb |
| 2019 | 0.330 ppb | 2 | 1 | ND - 0.660 ppb |
| 2020 | ND | 3 | 0 | ND |
| 2021 | 0.335 ppb | 2 | 1 | ND - 0.670 ppb |
| 2022 | ND | 2 | 0 | ND |
| 2023 | 0.360 ppb | 2 | 1 | ND - 0.720 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 |
|---|---|---|
| 2018-04-12 | Q1815139002 | 0.510 ppb |
| 2018-04-12 | Q1815139009 | ND |
| 2019-05-13 | Q1923868005 | ND |
| 2019-05-13 | Q1923868007 | 0.660 ppb |
| 2020-05-26 | Q2020632001 | ND |
| 2020-05-26 | Q2020632009 | ND |
| 2020-07-21 | Q2028843003 | ND |
| 2021-11-03 | Q2130890001 | ND |
| 2021-11-03 | Q2130890003 | 0.670 ppb |
| 2022-02-16 | Q2205791003 | ND |
| 2022-02-16 | Q2205791005 | ND |
| 2023-07-18 | Q2327997006 | ND |
| 2023-07-18 | Q2327997008 | 0.720 ppb |