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 |
|---|---|---|---|---|
| 2025-06-05 | BLACK HILLS ELECTRIC GENERATION - PAGS | PUEBLO, Pueblo, CO | Pass | State |
| 2025-06-05 | BLACK HILLS ELECTRIC GENERATION - PAGS | PUEBLO, Pueblo, CO | Pass | State |
| 2025-06-04 | BLACK HILLS ELECTRIC GENERATION - PAGS | PUEBLO, Pueblo, CO | Pass | State |
| 2025-06-04 | BLACK HILLS ELECTRIC GENERATION - PAGS | PUEBLO, Pueblo, CO | Pass | State |
| 2025-06-03 | DCP OPERATING CO - MEWBOURN — high-priority violation on file | GILCREST 2.4 MI. N OF, Weld, CO | Pass | State |
| 2025-06-03 | NOBLE ENERGY - CUTTHROAT,BROOK,RAINBOW | RAYMER (NEW RAYMER) 10.0 MI. N, Weld, CO | Pass | State |
| 2025-06-02 | BLACK HILLS ELECTRIC GENERATION - PAGS | PUEBLO, Pueblo, CO | Pass | State |
| 2025-05-29 | ROCKY MOUNTAIN MIDSTREAM - WATKINS C.S. | BENNETT AREA, Adams, CO | N/A | State |
| 2025-05-28 | ROCKIES EXPRESS PIPELINE - BIG HOLE CS | CRAIG 30.5 MI. NW OF, Moffat, CO | Pass | State |
| 2025-05-28 | UTAH GAS - DRAGON TRAIL — high-priority violation on file | RANGELY 16.7 MI. S OF, Rio Blanco, CO | Pass | State |
| 2025-05-28 | UTAH GAS - DRAGON TRAIL — high-priority violation on file | RANGELY 16.7 MI. S OF, Rio Blanco, CO | Pass | State |
| 2025-05-28 | UTAH GAS - DRAGON TRAIL — high-priority violation on file | RANGELY 16.7 MI. S OF, Rio Blanco, CO | Pass | State |
| 2025-05-28 | UTAH GAS - WEST DRAGON TRAIL C.S. | RANGELY 15.4 MI. S OF, Rio Blanco, CO | Pass | State |
| 2025-05-27 | BONANZA CREEK - ANTELOPE CPF 13-21 | KERSEY 10.4 MI. E OF, Weld, CO | Pass | State |
| 2025-05-23 | DCP OPERATING CO - LUCERNE 2 GAS PLANT — high-priority violation on file | GREELEY AREA, Weld, CO | Pass | State |
| 2025-05-23 | DCP OPERATING CO - LUCERNE 2 GAS PLANT — high-priority violation on file | GREELEY AREA, Weld, CO | Pass | State |
| 2025-05-22 | WES DJ GAS PROC - WATTENBERG PLANT | AURORA, Adams, CO | Pass | State |
| 2025-05-22 | BARGATH - RYAN GULCH COMPRESSOR STATION — high-priority violation on file | MEEKER 23.2 MI. W OF, Rio Blanco, CO | Pass | State |
| 2025-05-22 | WES DJ GATHERING - FREDERICK CS — high-priority violation on file | DACONO AREA, Weld, CO | Pass | State |
| 2025-05-21 | TS LANDFILL, LLC - BROAD CANYON LANDFILL | NATURITA, Montrose, CO | Pass | State |
| 2025-05-21 | BARGATH - RYAN GULCH COMPRESSOR STATION — high-priority violation on file | MEEKER 23.2 MI. W OF, Rio Blanco, CO | Pass | State |
| 2025-05-21 | WES DJ GATHERING - FREDERICK CS — high-priority violation on file | DACONO AREA, Weld, CO | Pass | State |
| 2025-05-20 | BARGATH - RYAN GULCH COMPRESSOR STATION — high-priority violation on file | MEEKER 23.2 MI. W OF, Rio Blanco, CO | Pass | State |
| 2025-05-20 | BARGATH - RYAN GULCH COMPRESSOR STATION — high-priority violation on file | MEEKER 23.2 MI. W OF, Rio Blanco, CO | Pass | State |
| 2025-05-20 | BARGATH - RYAN GULCH COMPRESSOR STATION — high-priority violation on file | MEEKER 23.2 MI. W OF, Rio Blanco, CO | Pass | State |
| 2025-05-20 | LEPRINO FOODS COMPANY - GREELEY PLANT | GREELEY, Weld, CO | Pass | State |
| 2025-05-20 | LEPRINO FOODS COMPANY - GREELEY PLANT | GREELEY, Weld, CO | Pass | State |
| 2025-05-20 | NOBLE ENERGY - WELLS RANCH AA11 ECONODE | KERSEY 10.7 MI. NE OF, Weld, CO | Pass | State |
| 2025-05-14 | BONANZA CREEK - NORTH PLATTE SECTION 34 | KERSEY 6.3 MI. E OF, Weld, CO | Pass | State |
| 2025-05-13 | EXTRACTION - WINDSOR LV2 PROD FACILITY | SEVERANCE AREA, Weld, CO | Pass | State |
| 2025-05-09 | GRAND RIVER GATHERING - PUMBA CS | RIFLE 3.4 MI. S OF, Garfield, CO | Pass | State |
| 2025-05-09 | BALL METAL BEVERAGE CONTAINER CORP | GOLDEN AREA, Jefferson, CO | Pass | State |
| 2025-05-09 | LARAMIE ENERGY - MVS COMPRESSOR STATION | COLLBRAN 10.8 MI. E OF, Mesa, CO | Pass | State |
| 2025-05-08 | EAGLE CNTY ROAD & BRIDGE DEPT | EDWARDS AREA, Eagle, CO | Pass | State |
| 2025-05-08 | QB ENERGY OPERATING - GASAWAY CS | GARFIELD COUNTY, Garfield, CO | Pass | State |
| 2025-05-08 | GRAND RIVER GATHERING - HUNTER MESA CS | RIFLE 3.3 MI. SE OF, Garfield, CO | Pass | State |
| 2025-05-08 | GRAND RIVER GATHERING - HUNTER MESA CS | RIFLE 3.3 MI. SE OF, Garfield, CO | Pass | State |
| 2025-05-08 | BALL METAL BEVERAGE CONTAINER CORP | GOLDEN AREA, Jefferson, CO | Fail | State |
| 2025-05-07 | QB ENERGY OPERATING - GASAWAY CS | GARFIELD COUNTY, Garfield, CO | Pass | State |
| 2025-05-07 | GRAND RIVER GATHERING - HUNTER MESA CS | RIFLE 3.3 MI. SE OF, Garfield, CO | Pass | State |
| 2025-05-07 | PUBLIC SERVICE CO - COMANCHE PLT — high-priority violation on file | PUEBLO, Pueblo, CO | Pass | State |
| 2025-05-07 | PUBLIC SERVICE CO - COMANCHE PLT — high-priority violation on file | PUEBLO, Pueblo, CO | Pass | State |
| 2025-05-06 | GRAND RIVER GATHERING - HUNTER MESA CS | RIFLE 3.3 MI. SE OF, Garfield, CO | Pass | State |
| 2025-05-06 | BALL METAL BEVERAGE CONTAINER CORP | GOLDEN AREA, Jefferson, CO | Pass | State |
| 2025-05-06 | BALL METAL BEVERAGE CONTAINER CORP | GOLDEN AREA, Jefferson, CO | Pass | State |
| 2025-05-06 | BALL METAL BEVERAGE CONTAINER CORP | GOLDEN AREA, Jefferson, CO | Pass | State |
| 2025-05-06 | BALL METAL BEVERAGE CONTAINER CORP | GOLDEN AREA, Jefferson, CO | Pass | State |
| 2025-05-06 | BALL METAL BEVERAGE CONTAINER CORP | GOLDEN AREA, Jefferson, CO | Pass | State |
| 2025-05-06 | BALL METAL BEVERAGE CONTAINER CORP | GOLDEN AREA, Jefferson, CO | Pass | State |
| 2025-05-06 | BALL METAL BEVERAGE CONTAINER CORP | GOLDEN AREA, Jefferson, CO | Pass | State |
| 2025-05-06 | DCP OPERATING CO - GODFREY BOTTOM C.S. | EVANS AREA, Weld, CO | Pass | State |
| 2025-05-06 | DCP OPERATING CO - GODFREY BOTTOM C.S. | EVANS AREA, Weld, CO | Pass | State |
| 2025-05-05 | GRAND RIVER GATHERING - HUNTER MESA CS | RIFLE 3.3 MI. SE OF, Garfield, CO | Pass | State |
| 2025-05-05 | DCP OPERATING - CANVASBACK C.S. | GREELEY, Weld, CO | Pass | State |
| 2025-05-05 | OWN RESOURCES OPERATING - KORF C.S. | ECKLEY 13.5 MI. N OF, Yuma, CO | Pass | State |
| 2025-04-30 | AMRIZE PORTLAND PLANT — high-priority violation on file | FLORENCE 3.8 MI. E OF, Fremont, CO | Pass | State |
| 2025-04-30 | PAWNEE WASTE - PAWNEE WASTE E&P LANDFILL | GROVER 3.8 MI. SE OF, Weld, CO | Fail | State |
| 2025-04-29 | CRESTONE PEAK - MUSTANG BOOSTER STATION — high-priority violation on file | AURORA, Adams, CO | Pass | State |
| 2025-04-29 | DCP OPERATING CO - MEWBOURN — high-priority violation on file | GILCREST 2.4 MI. N OF, Weld, CO | Fail | State |
| 2025-04-29 | SUMMIT DJ-S - GROVER COMPRESSOR STATION | GROVER 11.4 MI. SE OF, Weld, CO | Pass | State |
| 2025-04-29 | PRAIRIE OPERATING - ELDER PAD | EATON 3.7 MI. N OF, Weld, CO | Pass | State |
| 2025-04-28 | QB ENERGY OPERATING - CDP J25 496 | PARACHUTE 14.6 MI. N OF, Garfield, CO | Pass | State |
| 2025-04-25 | PLAINS END, LLC | ARVADA, Jefferson, CO | N/A | State |
| 2025-04-25 | DCP OPERATING CO - MEWBOURN — high-priority violation on file | GILCREST 2.4 MI. N OF, Weld, CO | Pass | State |
| 2025-04-25 | DCP OPERATING CO - MEWBOURN — high-priority violation on file | GILCREST 2.4 MI. N OF, Weld, CO | Pass | State |
| 2025-04-24 | PLAINS END, LLC | ARVADA, Jefferson, CO | N/A | State |
| 2025-04-24 | LARAMIE ENERGY - MVS COMPRESSOR STATION | COLLBRAN 10.8 MI. E OF, Mesa, CO | Pass | State |
| 2025-04-24 | WES DJ GATHERING - FREDERICK CS — high-priority violation on file | DACONO AREA, Weld, CO | Pass | State |
| 2025-04-24 | NOBLE ENERGY - LC24-6 ECONODE T9N-R59W-S | RAYMER (NEW RAYMER) 9.5 MI. N, Weld, CO | Pass | State |
| 2025-04-23 | PLAINS END, LLC | ARVADA, Jefferson, CO | Pass | State |
| 2025-04-23 | LARAMIE ENERGY - MVS COMPRESSOR STATION | COLLBRAN 10.8 MI. E OF, Mesa, CO | Pass | State |
| 2025-04-23 | LARAMIE ENERGY - MVS COMPRESSOR STATION | COLLBRAN 10.8 MI. E OF, Mesa, CO | Pass | State |
| 2025-04-23 | CF & I STEEL L.P. DBA EVRAZ ROCKY MTN ST — high-priority violation on file | PUEBLO AREA, Pueblo, CO | Pass | State |
| 2025-04-23 | WES DJ GATHERING - FREDERICK CS — high-priority violation on file | DACONO AREA, Weld, CO | Pass | State |
| 2025-04-22 | PLAINS END, LLC | ARVADA, Jefferson, CO | N/A | State |
| 2025-04-22 | LARAMIE ENERGY - MVS COMPRESSOR STATION | COLLBRAN 10.8 MI. E OF, Mesa, CO | Pass | State |
| 2025-04-22 | LARAMIE ENERGY - MVS COMPRESSOR STATION | COLLBRAN 10.8 MI. E OF, Mesa, CO | Pass | State |
| 2025-04-22 | CF & I STEEL L.P. DBA EVRAZ ROCKY MTN ST — high-priority violation on file | PUEBLO AREA, Pueblo, CO | Pass | State |
| 2025-04-22 | WES DJ GATHERING - FREDERICK CS — high-priority violation on file | DACONO AREA, Weld, CO | N/A | State |
| 2025-04-21 | PLAINS END, LLC | ARVADA, Jefferson, CO | N/A | State |
| 2025-04-21 | SUMMIT DJ-O OPERATING - MAKENA GAS PLANT | GROVER 16.1 MI. N OF, Weld, CO | Pass | State |
| 2025-04-18 | CRESTONE - STATE BIERSTADT 4-65 35-34 NO | AURORA AREA, Arapahoe, CO | Pass | State |
| 2025-04-18 | ROCKIES EXPRESS - HEREFORD RANCH CS | GROVER AREA, Weld, CO | Pass | State |
| 2025-04-17 | ROCKIES EXPRESS - HEREFORD RANCH CS | GROVER AREA, Weld, CO | Pass | State |
| 2025-04-16 | PUBLIC SERVICE CO - CHEROKEE PLT | COMMERCE CITY AREA, Adams, CO | Pass | State |
| 2025-04-16 | ROCKIES EXPRESS - LOGAN COUNTY CS | PEETZ AREA, Logan, CO | Pass | State |
| 2025-04-16 | WES DJ GATHERING - LATHAM GAS PLANT | GILCREST 2.4 MI. N OF, Weld, CO | Pass | State |
| 2025-04-15 | DCP OPERATING CO - NORTHSTAR C.S. | EATON 3.4 MI. N OF, Weld, CO | Pass | State |
| 2025-04-15 | DCP OPERATING CO - NORTHSTAR C.S. | EATON 3.4 MI. N OF, Weld, CO | Pass | State |
| 2025-04-15 | ROCKY MOUNTAIN MIDSTREAM - AUBURN CS | KERSEY AREA, Weld, CO | Fail | State |
| 2025-04-15 | OWN RESOURCES OPERATING - KORF C.S. | ECKLEY 13.5 MI. N OF, Yuma, CO | N/A | State |
| 2025-04-14 | DCP OPERATING CO - MILTON C.S. | LA SALLE 8.3 MI. N OF, Weld, CO | Pass | State |
| 2025-04-14 | DCP OPERATING CO - MILTON C.S. | LA SALLE 8.3 MI. N OF, Weld, CO | Pass | State |
| 2025-04-13 | WES DJ FT LUPTON/PLATTE VALLEY/LANCASTER — high-priority violation on file | FORT LUPTON, Weld, CO | Pass | State |
| 2025-04-11 | GCC RIO GRANDE - PUEBLO CEMENT PLANT — high-priority violation on file | PUEBLO 4.5 MI. S OF, Pueblo, CO | Pass | State |
| 2025-04-10 | GCC RIO GRANDE - PUEBLO CEMENT PLANT — high-priority violation on file | PUEBLO 4.5 MI. S OF, Pueblo, CO | Pass | State |
| 2025-04-10 | WES DJ FT LUPTON/PLATTE VALLEY/LANCASTER — high-priority violation on file | FORT LUPTON, Weld, CO | Pass | State |
| 2025-04-10 | WES DJ FT LUPTON/PLATTE VALLEY/LANCASTER — high-priority violation on file | FORT LUPTON, Weld, CO | Pass | State |
| 2025-04-10 | DCP OPERATING CO - ENTERPRISE C.S. — high-priority violation on file | KEENESBURG 5.2 MI. N OF, Weld, CO | Pass | State |
| 2025-04-09 | PUBLIC SERVICE CO - CHEROKEE PLT | COMMERCE CITY AREA, Adams, CO | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.