Chloromethane
Palmer Center Ugarc
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.
31
Samples
0
Samples exceeding legal limit (MCL)
9
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | 1.60 ppb | 5 | 3 | ND - 3.30 ppb |
| 2019 | 1.84 ppb | 4 | 3 | ND - 2.60 ppb |
| 2020 | 1.22 ppb | 9 | 4 | ND - 4.83 ppb |
| 2021 | 2.79 ppb | 5 | 5 | 1.02 ppb - 4.50 ppb |
| 2022 | 1.71 ppb | 4 | 2 | ND - 3.45 ppb |
| 2023 | 2.74 ppb | 4 | 4 | 2.23 ppb - 3.46 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 |
|---|---|---|
| 2018-01-10 | UG180098POC | 1.78 ppb |
| 2018-05-09 | PC180872 | ND |
| 2018-08-01 | 08011820POC | ND |
| 2018-08-13 | EHS1800035918POC | 3.30 ppb |
| 2018-10-09 | PC182388 | 2.90 ppb |
| 2019-01-07 | PC190059 | 2.47 ppb |
| 2019-04-24 | WD190998 | ND |
| 2019-07-17 | 07171903 | 2.60 ppb |
| 2019-10-14 | 10151907 | 2.30 ppb |
| 2020-01-06 | 01072016-POC | 1.90 ppb |
| 2020-04-22 | 04222018 | 2.42 ppb |
| 2020-05-12 | 05122005 | 1.86 ppb |
| 2020-06-01 | 06012004 | 4.83 ppb |
| 2020-07-01 | 07012020 | ND |
| 2020-07-20 | 07202003 | ND |
| 2020-08-11 | 08112028-2-DS | ND |
| 2020-08-11 | 08112028-1-RAW | ND |
| 2020-10-01 | 10012002-2 | ND |
| 2021-01-05 | 01052119-P | 4.50 ppb |
| 2021-01-25 | EHS2100013303P | 3.60 ppb |
| 2021-04-05 | 04052105N | 1.85 ppb |
| 2021-07-01 | 07012103 | 2.98 ppb |
| 2021-10-04 | 10042113 | 1.02 ppb |
| 2022-01-04 | 01042211 | 3.45 ppb |
| 2022-04-05 | 04052212 | 3.40 ppb |
| 2022-07-05 | 07052229 | ND |
| 2022-10-04 | 10042216-2 | ND |
| 2023-01-03 | 01032324-1 | 2.62 ppb |
| 2023-04-03 | 04032305 | 2.63 ppb |
| 2023-07-05 | PC232245 | 2.23 ppb |
| 2023-10-18 | 5530295 | 3.46 ppb |