EPA Air · stack tests by state and year
Air-emissions stack tests in Colorado, 2025
- 405Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit. Every stack test below was recorded against a source in Colorado during 2025; one facility can appear more than once, because this is a record of what happened rather than a list of places.
Counties in Colorado, 2025
- Weld County 186
- Garfield County 51
- Adams County 35
- Rio Blanco County 30
- Jefferson County 24
- Pueblo County 16
- Arapahoe County 14
- Boulder County 8
- Larimer County 7
- Mesa County 6
- Moffat County 5
- Prowers County 4
- Denver County 3
- Yuma County 3
Colorado, other years
Air-emissions stack tests recorded in Colorado, 2025
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2025-01-22 | OWENS-BROCKWAY GLASS - WINDSOR #28 — high-priority violation on file | WINDSOR, Weld, CO | Pass | State |
| 2025-01-15 | PUBLIC SERVICE CO STATE PLT | DENVER, Denver, CO | Pass | State |
| 2025-01-14 | NOBLE ENERGY - WELLS RANCH AE05, 06 ECON | KERSEY 12.9 MI. NE OF, Weld, CO | Pass | State |
| 2025-01-03 | AURORA CONV CENT- GAYLORD ROCKIES RESORT | AURORA, Adams, CO | Pass | State |
| 2025-01-03 | AURORA CONV CENT- GAYLORD ROCKIES RESORT | AURORA, Adams, CO | Pass | State |
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Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.