Chloromethane
City of Giddings
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.
12
Samples
0
Samples exceeding legal limit (MCL)
12
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | N/A | 0 | 0 | N/A |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | 7.65 ppb | 2 | 2 | 6.50 ppb - 8.80 ppb |
| 2019 | 7.75 ppb | 2 | 2 | 4.50 ppb - 11.0 ppb |
| 2020 | 5.70 ppb | 2 | 2 | 3.50 ppb - 7.90 ppb |
| 2021 | 6.70 ppb | 2 | 2 | 3.40 ppb - 10.00 ppb |
| 2022 | 5.40 ppb | 2 | 2 | 4.80 ppb - 6.00 ppb |
| 2023 | 8.80 ppb | 2 | 2 | 7.70 ppb - 9.90 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 |
|---|---|---|
| 2018-06-14 | AE30044 | 6.50 ppb |
| 2018-06-14 | AE30046 | 8.80 ppb |
| 2019-06-12 | AE70353 | 11.0 ppb |
| 2019-06-12 | AE70359 | 4.50 ppb |
| 2020-06-15 | AF15218 | 3.50 ppb |
| 2020-06-15 | AF15222 | 7.90 ppb |
| 2021-05-06 | AF52803 | 3.40 ppb |
| 2021-05-06 | AF52807 | 10.00 ppb |
| 2022-10-12 | AG16859 | 6.00 ppb |
| 2022-10-12 | AG16861 | 4.80 ppb |
| 2023-03-01 | AG30961 | 9.90 ppb |
| 2023-03-01 | AG30963 | 7.70 ppb |