EPA Air · stack tests by county and year
Air-emissions stack tests in Davis County, Utah, 2025
- 17Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit. Each row below is one stack test recorded against a source in Davis County, Utah during 2025. A facility can appear several times: this is the year’s record of what happened, not a list of places. The sources themselves are on the Davis County facility page.
Davis County, Utah, 2025
Air-emissions stack tests in Davis County, other years
Air-emissions stack tests recorded in Davis County, Utah, 2025
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2025-08-06 | HF SINCLAIR WOODS CROSS REFINERY (FORMERLY HOLLY) | Pass | State |
| 2025-07-23 | HF SINCLAIR WOODS CROSS REFINERY (FORMERLY HOLLY) | N/A | State |
| 2025-07-22 | HF SINCLAIR WOODS CROSS REFINERY (FORMERLY HOLLY) | Pass | State |
| 2025-06-03 | HF SINCLAIR WOODS CROSS REFINERY (FORMERLY HOLLY) | Pass | State |
| 2025-04-16 | HF SINCLAIR WOODS CROSS REFINERY (FORMERLY HOLLY) | Pass | State |
| 2025-04-15 | HF SINCLAIR WOODS CROSS REFINERY (FORMERLY HOLLY) | Pass | State |
| 2025-04-11 | HF SINCLAIR WOODS CROSS REFINERY (FORMERLY HOLLY) | Pass | State |
| 2025-04-10 | HF SINCLAIR WOODS CROSS REFINERY (FORMERLY HOLLY) | Pass | State |
| 2025-04-09 | HF SINCLAIR WOODS CROSS REFINERY (FORMERLY HOLLY) | Pass | State |
| 2025-04-08 | HF SINCLAIR WOODS CROSS REFINERY (FORMERLY HOLLY) | Pass | State |
| 2025-04-08 | HF SINCLAIR WOODS CROSS REFINERY (FORMERLY HOLLY) | Pass | State |
| 2025-03-05 | BIG WEST OIL | N/A | State |
| 2025-03-05 | BIG WEST OIL | N/A | State |
| 2025-03-05 | BIG WEST OIL | N/A | State |
| 2025-03-04 | BIG WEST OIL | N/A | State |
| 2025-01-15 | HILL AIR FORCE BASE | Pass | State |
| 2025-01-14 | HILL AIR FORCE BASE | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.