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 |
|---|---|---|---|---|
| 2025-09-25 | LEPRINO FOODS COMPANY - GREELEY PLANT | GREELEY, Weld, CO | N/A | State |
| 2025-09-25 | PRAIRIE OPERATING CO - HESTER FARMS II | SEVERANCE AREA, Weld, CO | Pass | State |
| 2025-09-24 | HIGHPOINT - PAPPENHEIM 6-62-23 | KERSEY 14.2 MI. NE OF, Weld, CO | Pass | State |
| 2025-09-24 | PDC ENERGY - POSTLE IC WEST | MEAD AREA, Weld, CO | Pass | State |
| 2025-09-23 | PLATTE RIVER POWER AUTHORITY - RAWHIDE | WELLINGTON 9.3 MI. N OF, Larimer, CO | Pass | State |
| 2025-09-18 | BLACK HILLS ELECTRIC GENERATION - PAGS | PUEBLO, Pueblo, CO | Pass | State |
| 2025-09-18 | WES DJ FT LUPTON/PLATTE VALLEY/LANCASTER — high-priority violation on file | FORT LUPTON, Weld, CO | Pass | State |
| 2025-09-17 | BLACK HILLS ELECTRIC GENERATION - PAGS | PUEBLO, Pueblo, CO | Pass | State |
| 2025-09-17 | BLACK HILLS ELECTRIC GENERATION - PAGS | PUEBLO, Pueblo, CO | Pass | State |
| 2025-09-16 | BLACK HILLS ELECTRIC GENERATION - PAGS | PUEBLO, Pueblo, CO | Pass | State |
| 2025-09-16 | BLACK HILLS ELECTRIC GENERATION - PAGS | PUEBLO, Pueblo, CO | Pass | State |
| 2025-09-11 | CITY OF GLENWOOD SPRINGS | GLENWOOD SPRINGS 3.2 MI. W OF, Garfield, CO | Pass | State |
| 2025-09-10 | CHEYENNE PLAINS GAS- KIRK COMP STAT | KIRK AREA, Yuma, CO | Pass | State |
| 2025-09-09 | COLORADO INTERSTATE GAS- KIT CARSON C.S. | KIT CARSON 6.6 MI. S OF, Cheyenne, CO | Pass | State |
| 2025-09-09 | COLORADO INTERSTATE GAS- KIT CARSON C.S. | KIT CARSON 6.6 MI. S OF, Cheyenne, CO | Pass | State |
| 2025-09-08 | DCP OPERATING CO - CROSSROADS FACILITY | KERSEY 5.0 MI. N OF, Weld, CO | Pass | State |
| 2025-09-08 | DCP OPERATING CO - CROSSROADS FACILITY | KERSEY 5.0 MI. N OF, Weld, CO | Pass | State |
| 2025-09-04 | PUBLIC SERVICE CO - HAYDEN PLT | HAYDEN, Routt, CO | Pass | State |
| 2025-09-03 | BONANZA CREEK ENERGY - ANTELOPE SECTION | KERSEY 9.2 MI. E OF, Weld, CO | Pending | State |
| 2025-09-03 | BONANZA CREEK ENERGY - ANTELOPE SECTION | KERSEY 9.2 MI. E OF, Weld, CO | Pending | State |
| 2025-09-03 | PDC ENERGY - WIEDEMAN/BOOMERANG PAD — high-priority violation on file | GREELEY AREA, Weld, CO | Pass | State |
| 2025-08-29 | ARCOSA LWB LLC - LIGHTWEIGHT - BOULDER — high-priority violation on file | SUPERIOR AREA, Jefferson, CO | Pass | State |
| 2025-08-28 | BONANZA CREEK - ANTELOPE CPF 13-21 | KERSEY 10.4 MI. E OF, Weld, CO | N/A | State |
| 2025-08-27 | CRESTONE PEAK - CROW 3-64 29-30 | AURORA, Adams, CO | Pass | State |
| 2025-08-27 | CEMEX CONSTRUCTION MATERIALS - LYONS — high-priority violation on file | LYONS AREA, Boulder, CO | Pass | State |
| 2025-08-27 | CEMEX CONSTRUCTION MATERIALS - LYONS — high-priority violation on file | LYONS AREA, Boulder, CO | Pass | State |
| 2025-08-27 | CEMEX CONSTRUCTION MATERIALS - LYONS — high-priority violation on file | LYONS AREA, Boulder, CO | Pass | State |
| 2025-08-27 | TEP ROCKY MTN - WEBSTER CS | RIFLE 2.0 MI. W OF, Garfield, CO | Pass | State |
| 2025-08-26 | PHILLIPS 66 PIPELINE - DENVER TERMINAL | COMMERCE CITY, Adams, CO | Pass | State |
| 2025-08-26 | BONANZA CRK STATE NORTH PLATTE CPF 42-26 | KERSEY 7.1 MI. N OF, Weld, CO | Pass | State |
| 2025-08-25 | BONANZA CREEK - STATE NORTH PLATTE T-36 | KERSEY 8.3 MI. E OF, Weld, CO | Pass | State |
| 2025-08-25 | BONANZA CREEK - STATE NORTH PLATTE T-36 | KERSEY 8.3 MI. E OF, Weld, CO | Pass | State |
| 2025-08-25 | BONANZA CREEK - STATE NORTH PLATTE T-36 | KERSEY 8.3 MI. E OF, Weld, CO | Pass | State |
| 2025-08-22 | ENTERPRISE PRODUCTS OP- JACKRABBIT CS | PARACHUTE 9.5 MI. NW OF, Garfield, CO | Pass | State |
| 2025-08-22 | WES DJ FT LUPTON/PLATTE VALLEY/LANCASTER — high-priority violation on file | FORT LUPTON, Weld, CO | N/A | State |
| 2025-08-22 | DCP OPERATING CO - LUCERNE 2 GAS PLANT — high-priority violation on file | GREELEY AREA, Weld, CO | Pass | State |
| 2025-08-21 | WES DJ FT LUPTON/PLATTE VALLEY/LANCASTER — high-priority violation on file | FORT LUPTON, Weld, CO | N/A | State |
| 2025-08-20 | BARGATH LLC - PARACHUTE CREEK GAS PLANT | PARACHUTE 2.9 MI. NW OF, Garfield, CO | Pass | State |
| 2025-08-20 | BARGATH LLC - PARACHUTE CREEK GAS PLANT | PARACHUTE 2.9 MI. NW OF, Garfield, CO | Pass | State |
| 2025-08-19 | SUNCOR ENERGY - DENVER REFINERY — high-priority violation on file | COMMERCE CITY, Adams, CO | Pass | State |
| 2025-08-19 | BARGATH LLC - PARACHUTE CREEK GAS PLANT | PARACHUTE 2.9 MI. NW OF, Garfield, CO | Pass | State |
| 2025-08-18 | CRESTONE PEAK - ARKANSAS 4-64 3-2 | WATKINS AREA, Arapahoe, CO | Pass | State |
| 2025-08-15 | CO STATE U - FOOTHILLS FACILITY | FORT COLLINS AREA, Larimer, CO | Pass | State |
| 2025-08-06 | CRESTONE - STATE BIERSTADT 4-65 35-34 NO | AURORA AREA, Arapahoe, CO | Pass | State |
| 2025-08-06 | CRESTONE - STATE BIERSTADT 4-65 35-34 NO | AURORA AREA, Arapahoe, CO | Pass | State |
| 2025-08-05 | CRESTONE PEAK - RUSH 4-65 29-30 SOUTH | AURORA, Arapahoe, CO | Pass | State |
| 2025-08-05 | CRESTONE PEAK - RUSH 4-65 29-30 SOUTH | AURORA, Arapahoe, CO | Pass | State |
| 2025-08-05 | NOBLE ENERGY - TIMBRO LC13 ECONODE | RAYMER 9.7 MI. NW OF, Weld, CO | Pass | State |
| 2025-08-04 | EXTRACTION OIL & GAS - FRYE NORTH | WINDSOR, Weld, CO | Pass | State |
| 2025-08-04 | EXTRACTION OIL & GAS - FRYE NORTH | WINDSOR, Weld, CO | Pass | State |
| 2025-08-01 | ROCKY MOUNTAIN MIDSTREAM - AUBURN CS | KERSEY AREA, Weld, CO | Pass | State |
| 2025-07-31 | CEMEX CONSTRUCTION MATERIALS - LYONS — high-priority violation on file | LYONS AREA, Boulder, CO | Pass | State |
| 2025-07-31 | WES DJ FT LUPTON/PLATTE VALLEY/LANCASTER — high-priority violation on file | FORT LUPTON, Weld, CO | N/A | State |
| 2025-07-30 | CEMEX CONSTRUCTION MATERIALS - LYONS — high-priority violation on file | LYONS AREA, Boulder, CO | Pass | State |
| 2025-07-30 | CEMEX CONSTRUCTION MATERIALS - LYONS — high-priority violation on file | LYONS AREA, Boulder, CO | Pass | State |
| 2025-07-30 | CEMEX CONSTRUCTION MATERIALS - LYONS — high-priority violation on file | LYONS AREA, Boulder, CO | Pass | State |
| 2025-07-29 | GRAND RIVER GATHERING - PUMBA CS | RIFLE 3.4 MI. S OF, Garfield, CO | Pass | State |
| 2025-07-29 | PRAIRIE OPERATING - BURROUGHS PROD FAC | EATON 3.7 MI. N OF, Weld, CO | Pass | State |
| 2025-07-28 | CEMEX CONSTRUCTION MATERIALS - LYONS — high-priority violation on file | LYONS AREA, Boulder, CO | Pass | State |
| 2025-07-25 | ENTERPRISE PRODUCTS OP- JACKRABBIT CS | PARACHUTE 9.5 MI. NW OF, Garfield, CO | Pass | State |
| 2025-07-25 | ENTERPRISE PRODUCTS OP- JACKRABBIT CS | PARACHUTE 9.5 MI. NW OF, Garfield, CO | Pass | State |
| 2025-07-25 | ENTERPRISE PRODUCTS OP- JACKRABBIT CS | PARACHUTE 9.5 MI. NW OF, Garfield, CO | Pass | State |
| 2025-07-24 | TEP ROCKY MTN- BAILEY COMPRESSOR STATION | SILT 2.2 MI. S OF, Garfield, CO | Pass | State |
| 2025-07-24 | ENTERPRISE PRODUCTS OP- JACKRABBIT CS | PARACHUTE 9.5 MI. NW OF, Garfield, CO | Pass | State |
| 2025-07-24 | ENTERPRISE PRODUCTS OP- JACKRABBIT CS | PARACHUTE 9.5 MI. NW OF, Garfield, CO | Pass | State |
| 2025-07-23 | TEP ROCKY MOUNTAIN - MAMM CREEK CS | RIFLE AREA, Garfield, CO | Pass | State |
| 2025-07-23 | PUBLIC SERV - ROCKY MOUNTAIN ENERGY | HUDSON AREA, Weld, CO | Pass | State |
| 2025-07-22 | SUNCOR ENERGY - DENVER REFINERY — high-priority violation on file | COMMERCE CITY, Adams, CO | Pass | State |
| 2025-07-22 | OLDCASTLE SW GROUP - GYPSUM RANCH | GYPSUM AREA, Eagle, CO | Pass | State |
| 2025-07-22 | PUBLIC SERV - ROCKY MOUNTAIN ENERGY | HUDSON AREA, Weld, CO | Pass | State |
| 2025-07-22 | BONANZA CREEK - ANTELOPE CPF 13-21 | KERSEY 10.4 MI. E OF, Weld, CO | Pass | State |
| 2025-07-22 | ROCK & RAIL - HIGHWAY 34 FACILITY | JOHNSTOWN, Weld, CO | Pass | State |
| 2025-07-21 | BONANZA CREEK - ANTELOPE CPF 13-21 | KERSEY 10.4 MI. E OF, Weld, CO | Pass | State |
| 2025-07-21 | BONANZA CREEK - ANTELOPE CPF 13-21 | KERSEY 10.4 MI. E OF, Weld, CO | Pass | State |
| 2025-07-18 | PLATTE RIVER POWER AUTHORITY - RAWHIDE | WELLINGTON 9.3 MI. N OF, Larimer, CO | N/A | State |
| 2025-07-17 | PLATTE RIVER POWER AUTHORITY - RAWHIDE | WELLINGTON 9.3 MI. N OF, Larimer, CO | N/A | State |
| 2025-07-16 | CRESTONE PEAK RESOURCES - RUSH 4-65 29-3 | AURORA, Arapahoe, CO | Pass | State |
| 2025-07-16 | CRESTONE PEAK RESOURCES - RUSH 4-65 29-3 | AURORA, Arapahoe, CO | Pass | State |
| 2025-07-09 | DCP OPERATING CO - MEWBOURN — high-priority violation on file | GILCREST 2.4 MI. N OF, Weld, CO | Pass | State |
| 2025-07-01 | KING SOOPERS, INC. - BAKERY | DENVER, Denver, CO | Pass | State |
| 2025-07-01 | KING SOOPERS, INC. - BAKERY | DENVER, Denver, CO | Pass | State |
| 2025-06-30 | EXTRACTION O&G - ALMA 1S-66-2524 | DENVER, Adams, CO | Pass | State |
| 2025-06-30 | EXTRACTION O&G - ALMA 1S-66-2524 | DENVER, Adams, CO | Pass | State |
| 2025-06-30 | CRESTONE PEAK - KING 3-65 28-29 | AURORA, Adams, CO | Pass | State |
| 2025-06-27 | ROCKY MOUNTAIN MIDSTREAM - AUBURN CS | KERSEY AREA, Weld, CO | N/A | State |
| 2025-06-23 | DCP OPERATING CO - O'CONNOR GAS PLANT | KERSEY AREA, Weld, CO | Pass | State |
| 2025-06-23 | DCP OPERATING CO - O'CONNOR GAS PLANT | KERSEY AREA, Weld, CO | Pass | State |
| 2025-06-21 | TRI STATE GENERATION & TRANS - CRAIG | CRAIG 2.9 MI. SW OF, Moffat, CO | Pass | State |
| 2025-06-19 | BARGATH LLC - PARACHUTE CREEK GAS PLANT | PARACHUTE 2.9 MI. NW OF, Garfield, CO | Pass | State |
| 2025-06-19 | BARGATH LLC - PARACHUTE CREEK GAS PLANT | PARACHUTE 2.9 MI. NW OF, Garfield, CO | Pass | State |
| 2025-06-19 | DCP OPERATING CO - SULLIVAN C.S. | KERSEY 16.1 MI. NE OF, Weld, CO | Pass | State |
| 2025-06-19 | PRAIRIE OPERATING CO - REEMAN PAD | EATON AREA, Weld, CO | Pass | State |
| 2025-06-18 | BARGATH LLC - PARACHUTE CREEK GAS PLANT | PARACHUTE 2.9 MI. NW OF, Garfield, CO | Pass | State |
| 2025-06-18 | BARGATH LLC - PARACHUTE CREEK GAS PLANT | PARACHUTE 2.9 MI. NW OF, Garfield, CO | Pass | State |
| 2025-06-18 | BONANZA CREEK ENERGY - ANTELOPE SECTION | KERSEY 9.2 MI. E OF, Weld, CO | Pass | State |
| 2025-06-18 | DCP OPERATING CO - ROCKY TURBINE CS | KERSEY 8.6 MI. NE OF, Weld, CO | Pass | State |
| 2025-06-18 | DCP OPERATING CO - ROCKY TURBINE CS | KERSEY 8.6 MI. NE OF, Weld, CO | Pass | State |
| 2025-06-16 | PDC ENERGY - BRANT LE PAD | TODD CREEK, Adams, CO | Pass | State |
| 2025-06-12 | WASTE MGMT - NORTH WELD LANDFILL | SEVERANCE AREA, Weld, CO | Pass | State |
| 2025-06-09 | PDC ENERGY - VOLT 5 SEC HZ | GREELEY, Weld, CO | Fail | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.