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 |
|---|---|---|---|---|
| 2025-12-31 | PDC ENERGY INC - CALIFORNIA 14 SEC HZ | EATON AREA, Weld, CO | Pass | State |
| 2025-12-30 | PDC ENERGY, INC. - STOUT 18 SEC HZ | SEVERANCE AREA, Weld, CO | Pass | State |
| 2025-12-23 | NOBLE ENERGY - LD22-A ECONODE T9N-R58W-S | RAYMER 8.0 MI. N OF, Weld, CO | Pass | State |
| 2025-12-23 | PDC ENERGY - MARKET FEDERAL 18 SEC HZ | AULT AREA, Weld, CO | Pass | State |
| 2025-12-18 | LEPRINO FOODS COMPANY - GREELEY PLANT | GREELEY, Weld, CO | Fail | State |
| 2025-12-18 | REP PROCESSING - SEVERANCE COMP STATION | AULT AREA, Weld, CO | Pass | State |
| 2025-12-17 | DCP OPERATING CO - O'CONNOR GAS PLANT | KERSEY AREA, Weld, CO | Pass | State |
| 2025-12-17 | DCP OPERATING CO - O'CONNOR GAS PLANT | KERSEY AREA, Weld, CO | Pass | State |
| 2025-12-17 | BONANZA CRK ENERGY - NORTH PLATTE 24-34 | KERSEY 6.1 MI. N OF, Weld, CO | N/A | State |
| 2025-12-17 | BONANZA CRK ENERGY - NORTH PLATTE 24-34 | KERSEY 6.1 MI. N OF, Weld, CO | Pass | State |
| 2025-12-17 | REP PROCESSING - SEVERANCE COMP STATION | AULT AREA, Weld, CO | Pass | State |
| 2025-12-17 | REP PROCESSING - SEVERANCE COMP STATION | AULT AREA, Weld, CO | Pass | State |
| 2025-12-16 | COLORADO INTERSTATE GAS CO - GREASEWOOD | MEEKER 16.5 MI. SW OF, Rio Blanco, CO | Pass | State |
| 2025-12-16 | HIGHPOINT - ANSCHUTZ EQUUS FARMS 4-62-28 | ORCHARD 11.6 MI. N OF, Weld, CO | Pass | State |
| 2025-12-16 | REP PROCESSING - SEVERANCE COMP STATION | AULT AREA, Weld, CO | Pass | State |
| 2025-12-16 | REP PROCESSING - SEVERANCE COMP STATION | AULT AREA, Weld, CO | Pass | State |
| 2025-12-15 | REP PROCESSING - SEVERANCE COMP STATION | AULT AREA, Weld, CO | Pass | State |
| 2025-12-15 | REP PROCESSING - SEVERANCE COMP STATION | AULT AREA, Weld, CO | Pass | State |
| 2025-12-12 | ARCOSA LWB LLC - LIGHTWEIGHT - BOULDER — high-priority violation on file | SUPERIOR AREA, Jefferson, CO | Pass | State |
| 2025-12-10 | QB ENERGY OPERATING - K24 496 | PARACHUTE 15.5 MI. N OF, Garfield, CO | Pending | State |
| 2025-12-10 | DCP OPERATING CO - LUCERNE 2 GAS PLANT — high-priority violation on file | GREELEY AREA, Weld, CO | N/A | State |
| 2025-12-10 | DCP OPERATING CO - LUCERNE 2 GAS PLANT — high-priority violation on file | GREELEY AREA, Weld, CO | N/A | State |
| 2025-12-03 | COORSTEK INC - CLEAR CREEK VALLEY PLANT — high-priority violation on file | GOLDEN AREA, Jefferson, CO | Fail | State |
| 2025-12-01 | BONANZA CREEK - STATE PRONGHORN CPF 41-3 | WIGGINS 11.6 MI. NW OF, Weld, CO | Fail | State |
| 2025-11-26 | DCP OPERATING CO - ROGGEN NGPP — high-priority violation on file | KEENESBURG 4.4 MI. E OF, Weld, CO | Pass | State |
| 2025-11-25 | WES DJ GAS PROC - WATTENBERG PLANT | AURORA, Adams, CO | N/A | State |
| 2025-11-20 | WILLIAMS FIELD - WILLOW CREEK GAS PLANT — high-priority violation on file | RIO BLANCO 18 MILES W OF, Rio Blanco, CO | Pass | State |
| 2025-11-19 | WILLIAMS FIELD - WILLOW CREEK GAS PLANT — high-priority violation on file | RIO BLANCO 18 MILES W OF, Rio Blanco, CO | Pass | State |
| 2025-11-19 | WILLIAMS FIELD - WILLOW CREEK GAS PLANT — high-priority violation on file | RIO BLANCO 18 MILES W OF, Rio Blanco, CO | Pass | State |
| 2025-11-19 | OWENS-BROCKWAY GLASS - WINDSOR #28 — high-priority violation on file | WINDSOR, Weld, CO | Fail | State |
| 2025-11-17 | HIGHPOINT - ANSCHUTZ EQUUS FARMS 4-62-15 | KERSEY 12.6 MI. E OF, Weld, CO | Pass | State |
| 2025-11-13 | BONANZA CREEK ENERGY- NORTH PLATTE 14-36 | KERSEY, Weld, CO | Fail | State |
| 2025-11-13 | BONANZA CREEK ENERGY- NORTH PLATTE 14-36 | KERSEY, Weld, CO | Fail | State |
| 2025-11-12 | CRESTONE PEAK - RESERVE 3-65 35-34 | AURORA, Adams, CO | Fail | State |
| 2025-11-12 | CRESTONE PEAK - RESERVE 3-65 35-34 | AURORA, Adams, CO | Fail | State |
| 2025-11-11 | CRESTONE PEAK - GRANDE 4-65 20-19 NORTH | AURORA, Arapahoe, CO | Pass | State |
| 2025-11-11 | CRESTONE PEAK - GRANDE 4-65 20-19 NORTH | AURORA, Arapahoe, CO | Pass | State |
| 2025-11-11 | WES DJ GATHERING - FREDERICK CS — high-priority violation on file | DACONO AREA, Weld, CO | Pass | State |
| 2025-11-10 | MID-AMERICA PIPELINE CO DOVE CR STA | DOVE CREEK 5.3 MI. NW OF, Dolores, CO | Pass | State |
| 2025-11-06 | LARAMIE ENERGY - CONN CREEK GAS — high-priority violation on file | PARACHUTE 10.1 MI. W OF, Garfield, CO | Pass | State |
| 2025-11-05 | LARAMIE ENERGY - CONN CREEK GAS — high-priority violation on file | PARACHUTE 10.1 MI. W OF, Garfield, CO | Pass | State |
| 2025-11-05 | HIGHPOINT - ANSCHUTZ EQUUS FARMS 4-62-28 | ORCHARD 11.6 MI. N OF, Weld, CO | Pass | State |
| 2025-11-04 | LARAMIE ENERGY - CONN CREEK GAS — high-priority violation on file | PARACHUTE 10.1 MI. W OF, Garfield, CO | Pass | State |
| 2025-11-04 | WYOMING INTERSTATE - SNAKE RIVER C.S. | CRAIG 37.2 MI. NW OF, Moffat, CO | Pass | State |
| 2025-11-04 | WYOMING INTERSTATE - SNAKE RIVER C.S. | CRAIG 37.2 MI. NW OF, Moffat, CO | Pass | State |
| 2025-11-03 | ROCKIES EXPRESS PIPELINE LLC - MEEKER | MEEKER 21.0 MI. N OF, Rio Blanco, CO | Pass | State |
| 2025-11-03 | ROCKIES EXPRESS PIPELINE LLC - MEEKER | MEEKER 21.0 MI. N OF, Rio Blanco, CO | Pass | State |
| 2025-10-31 | LARAMIE ENERGY - CONN CREEK GAS — high-priority violation on file | PARACHUTE 10.1 MI. W OF, Garfield, CO | Pass | State |
| 2025-10-31 | PLAINS END, LLC | ARVADA, Jefferson, CO | Pass | State |
| 2025-10-30 | LARAMIE ENERGY - CONN CREEK GAS — high-priority violation on file | PARACHUTE 10.1 MI. W OF, Garfield, CO | Pass | State |
| 2025-10-30 | LARAMIE ENERGY - CONN CREEK GAS — high-priority violation on file | PARACHUTE 10.1 MI. W OF, Garfield, CO | Pass | State |
| 2025-10-30 | LARAMIE ENERGY - CONN CREEK GAS — high-priority violation on file | PARACHUTE 10.1 MI. W OF, Garfield, CO | Pass | State |
| 2025-10-30 | PLAINS END, LLC | ARVADA, Jefferson, CO | Pass | State |
| 2025-10-30 | UTAH GAS - WEST DRAGON TRAIL C.S. | RANGELY 15.4 MI. S OF, Rio Blanco, CO | Pending | State |
| 2025-10-30 | COLORADO INTERSTATE GAS CO - CHEYENNE CS — high-priority violation on file | NUNN 14.8 MI. N OF, Weld, CO | Pass | State |
| 2025-10-30 | HIGHPOINT - ANSCHUTZ EQUUS FARMS 4-62-28 | ORCHARD 11.6 MI. N OF, Weld, CO | Pass | State |
| 2025-10-30 | HIGHPOINT - ANSCHUTZ EQUUS FARMS 4-62-28 | ORCHARD 11.6 MI. N OF, Weld, CO | Pass | State |
| 2025-10-30 | HIGHPOINT - ANSCHUTZ EQUUS FARMS 4-62-28 | ORCHARD 11.6 MI. N OF, Weld, CO | Pass | State |
| 2025-10-30 | HIGHPOINT - ANSCHUTZ EQUUS FARMS 4-62-28 | ORCHARD 11.6 MI. N OF, Weld, CO | Pass | State |
| 2025-10-29 | LARAMIE ENERGY - CONN CREEK GAS — high-priority violation on file | PARACHUTE 10.1 MI. W OF, Garfield, CO | Pass | State |
| 2025-10-29 | PLAINS END, LLC | ARVADA, Jefferson, CO | Pass | State |
| 2025-10-29 | UTAH GAS - DRAGON TRAIL — high-priority violation on file | RANGELY 16.7 MI. S OF, Rio Blanco, CO | Pass | State |
| 2025-10-29 | COLORADO INTERSTATE GAS CO - CHEYENNE CS — high-priority violation on file | NUNN 14.8 MI. N OF, Weld, CO | Pass | State |
| 2025-10-29 | PUBLIC SERV - ROCKY MOUNTAIN ENERGY | HUDSON AREA, Weld, CO | Pass | State |
| 2025-10-29 | BONANZA CREEK - STATE ANTELOPE CPF O-1 | KERSEY 14.0 MI. E OF, Weld, CO | Fail | State |
| 2025-10-28 | LARAMIE ENERGY - CONN CREEK GAS — high-priority violation on file | PARACHUTE 10.1 MI. W OF, Garfield, CO | Pass | State |
| 2025-10-28 | LARAMIE ENERGY - CONN CREEK GAS — high-priority violation on file | PARACHUTE 10.1 MI. W OF, Garfield, CO | Pass | State |
| 2025-10-28 | PLAINS END, LLC | ARVADA, Jefferson, CO | Pass | State |
| 2025-10-28 | COLORADO INTERSTATE GAS CO - CHEYENNE CS — high-priority violation on file | NUNN 14.8 MI. N OF, Weld, CO | Pass | State |
| 2025-10-23 | SUNCOR ENERGY - DENVER REFINERY — high-priority violation on file | COMMERCE CITY, Adams, CO | Pass | State |
| 2025-10-23 | AMRIZE PORTLAND PLANT — high-priority violation on file | FLORENCE 3.8 MI. E OF, Fremont, CO | Pass | State |
| 2025-10-23 | SEELEY OIL CO - CUTTHROAT BATTERY B | MONTEZUMA COUNTY, Montezuma, CO | Pass | State |
| 2025-10-23 | WES DJ FT LUPTON/PLATTE VALLEY/LANCASTER — high-priority violation on file | FORT LUPTON, Weld, CO | Pass | State |
| 2025-10-22 | WES DJ GATHERING - FREDERICK CS — high-priority violation on file | DACONO AREA, Weld, CO | Pass | State |
| 2025-10-21 | DCP OPERATING CO - LIBSACK C.S. | GREELEY AREA, Weld, CO | Pass | State |
| 2025-10-20 | DCP OPERATING CO - LIBSACK C.S. | GREELEY AREA, Weld, CO | N/A | State |
| 2025-10-17 | COLORADO SPRINGS UTILITIES - NIXON PLT | FOUNTAIN AREA, El Paso, CO | Pass | State |
| 2025-10-16 | BIOCHAR NOW, LLC - BERTHOUD PLANT | BERTHOUD, Weld, CO | Pass | State |
| 2025-10-14 | PDC ENERGY - ORR STATE 40-36 PAD | GREELEY AREA, Weld, CO | Pass | State |
| 2025-10-14 | NOBLE ENERGY - NCLP PC AA04 AA06 ECONODE | GILL AREA, Weld, CO | Pass | State |
| 2025-10-10 | SUMMIT DJ-O OPERATING - KOKI — high-priority violation on file | JACKSON LAKE, Weld, CO | Pass | State |
| 2025-10-09 | DCP OPERATING CO - ROGGEN NGPP — high-priority violation on file | KEENESBURG 4.4 MI. E OF, Weld, CO | Fail | State |
| 2025-10-09 | WES DJ FT LUPTON/PLATTE VALLEY/LANCASTER — high-priority violation on file | FORT LUPTON, Weld, CO | Pass | State |
| 2025-10-09 | DCP OPERATING CO - ENTERPRISE C.S. — high-priority violation on file | KEENESBURG 5.2 MI. N OF, Weld, CO | Pass | State |
| 2025-10-09 | EXTRACTION - WAKE EAST 32N PROD FACILITY | GREELEY AREA, Weld, CO | Pass | State |
| 2025-10-08 | DCP OPERATING CO - ENTERPRISE C.S. — high-priority violation on file | KEENESBURG 5.2 MI. N OF, Weld, CO | Pending | State |
| 2025-10-08 | DCP OPERATING CO - ENTERPRISE C.S. — high-priority violation on file | KEENESBURG 5.2 MI. N OF, Weld, CO | Pass | State |
| 2025-10-06 | EXTRACTION - WAKE EAST 32N PROD FACILITY | GREELEY AREA, Weld, CO | Pass | State |
| 2025-10-06 | EXTRACTION - WAKE EAST 32N PROD FACILITY | GREELEY AREA, Weld, CO | Pass | State |
| 2025-10-03 | WES DJ GATHERING - FREDERICK CS — high-priority violation on file | DACONO AREA, Weld, CO | Pass | State |
| 2025-10-02 | HOLLY ENERGY - DENVER PRODUCTS TERMINAL | COMMERCE CITY AREA, Adams, CO | Pass | State |
| 2025-10-02 | HOLLY ENERGY - DENVER PRODUCTS TERMINAL | COMMERCE CITY AREA, Adams, CO | Pass | State |
| 2025-10-02 | HOLLY ENERGY - DENVER PRODUCTS TERMINAL | COMMERCE CITY AREA, Adams, CO | Pass | State |
| 2025-10-02 | PAWNEE WASTE - PAWNEE WASTE E&P LANDFILL | GROVER 3.8 MI. SE OF, Weld, CO | Pass | State |
| 2025-10-01 | UTAH GAS - DRAGON TRAIL 1121 | RANGELY 17.1 MI. S OF, Rio Blanco, CO | Pass | State |
| 2025-09-30 | SUNCOR ENERGY - DENVER REFINERY — high-priority violation on file | COMMERCE CITY, Adams, CO | Pass | State |
| 2025-09-29 | WES DJ FT LUPTON/PLATTE VALLEY/LANCASTER — high-priority violation on file | FORT LUPTON, Weld, CO | Pass | State |
| 2025-09-28 | ROCKY MT MIDSTREAM- KEENESBURG GAS PLANT | KEENESBURG, Weld, CO | Pass | State |
| 2025-09-25 | ROCKY MOUNTAIN MIDSTREAM - WATKINS C.S. | BENNETT AREA, Adams, CO | Pass | State |
| 2025-09-25 | ROCKY MOUNTAIN MIDSTREAM - WATKINS C.S. | BENNETT AREA, 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.