Chloromethane
CTWC - Unionville System
NOTE: CTWC - Unionville System purchases water from Metropolitan District Commission which is required to test for chloromethane. Sample information shown below was taken by Metropolitan District Commission.
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.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2013 | ND | 6 | 0 | ND |
| 2014 | ND | 6 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 3 | 0 | ND |
| 2019 | ND | 2 | 0 | ND |
| 2020 | ND | 5 | 0 | ND |
| 2021 | ND | 5 | 0 | ND |
| 2022 | ND | 4 | 0 | ND |
| 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
NOTE: CTWC - Unionville System purchases water from Metropolitan District Commission which is required to test for chloromethane. Sample information shown below was taken by Metropolitan District Commission.
| Date | Lab ID | Result |
|---|---|---|
| 2013-07-17 | 201307180742AM | ND |
| 2013-07-17 | 201307180544AM | ND |
| 2013-07-17 | 201307180553AM | ND |
| 2013-10-09 | 201310100586AM | ND |
| 2013-10-09 | 201310100524AM | ND |
| 2013-10-09 | 201310100588AM | ND |
| 2014-01-07 | 201401080365AM | ND |
| 2014-01-07 | 201401080426AM | ND |
| 2014-01-07 | 201401080380AM | ND |
| 2014-04-08 | 201404090441AM | ND |
| 2014-04-08 | 201404090495AM | ND |
| 2014-04-08 | 201404090429AM | ND |
| 2018-07-16 | AE00927GE | ND |
| 2018-07-16 | AE00911GE | ND |
| 2018-07-16 | AE00912GE | ND |
| 2019-06-05 | AE29314GE | ND |
| 2019-06-05 | AE29313GE | ND |
| 2019-06-05 | AE29315GE | ND |
| 2020-06-02 | AE59301GE | ND |
| 2020-06-02 | AE59305GE | ND |
| 2020-06-02 | AE59302GE | ND |
| 2021-11-23 | V300107450 300107457 | ND |
| 2021-11-23 | V300107451 300107463 | ND |
| 2021-11-29 | V300109635 300109637 | ND |
| 2022-12-15 | V300287072 300287079 | ND |
| 2022-12-15 | V300287053 300287060 | ND |
| 2022-12-15 | V300287100 300287107 | ND |
| 2023-12-06 | V300456533 300456535 | ND |
| 2023-12-06 | V300456525 300456531 | ND |
| 2023-12-06 | V300456527 300456529 | ND |