Trichlorofluoromethane
San Francisco City Water System
Trichlorofluoromethane (Freon 11) is a refrigerant, solvent and aerosol propellant banned in 2000 under the Montreal Protocol because of its ozone-depleting properties. Freons can cause heart, nervous system and liver damage.
22
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 |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | N/A | 0 | 0 | N/A |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | ND | 1 | 0 | ND |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 17 | 0 | ND |
| 2019 | ND | 4 | 0 | ND |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 1,300 ppb
The EWG Health Guideline of 1,300 ppb for trichlorofluoromethane was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against harm to internal organs.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2016-06-14 | 9553-001-0920 | ND |
| 2018-01-11 | 9553-007-1115 | ND |
| 2018-03-06 | 9590-004-1031 | ND |
| 2018-03-08 | 9590-006-0925 | ND |
| 2018-04-17 | 9590-007-1055 | ND |
| 2018-04-30 | 9590-008-1013 | ND |
| 2018-06-12 | 9590-008-0930 | ND |
| 2018-06-12 | 9590-004-1058 | ND |
| 2018-07-17 | 9590-007-0519 | ND |
| 2018-07-26 | 9553-006-0838 | ND |
| 2018-09-12 | 9590-004-0944 | ND |
| 2018-09-25 | 9553-006-0930 | ND |
| 2018-09-25 | 9553-004-0910 | ND |
| 2018-09-25 | 9553-008-0950 | ND |
| 2018-10-17 | 9553-007-0730 | ND |
| 2018-12-11 | 9553-004-0845 | ND |
| 2018-12-11 | 9553-006-0915 | ND |
| 2018-12-11 | 9553-008-1045 | ND |
| 2019-06-17 | 9553-008-1106 | ND |
| 2019-06-17 | 9553-007-0905 | ND |
| 2019-06-17 | 9553-006-1206 | ND |
| 2019-06-17 | 9553-004-0956 | ND |