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.
What this page shows
This page covers Clean Air Act facilities in the EPA air register with stack tests in Davis county, UT, in 2025. Stack tests recorded in 2025: 17.