EPA Air · stack tests by state and year

Air-emissions stack tests in Colorado, 2023

436Stack 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 2023; one facility can appear more than once, because this is a record of what happened rather than a list of places.

Counties in Colorado, 2023

Colorado, other years

Air-emissions stack tests recorded in Colorado, 2023

Date	Facility	Where	Kind	Agency
2023-07-24	DCP OPERATING CO - ENTERPRISE C.S. — high-priority violation on file	KEENESBURG 5.2 MI. N OF, Weld, CO	Pass	State
2023-07-21	SUNCOR ENERGY - DENVER REFINERY — high-priority violation on file	COMMERCE CITY, Adams, CO	N/A	State
2023-07-20	CEMEX CONSTRUCTION MATERIALS - LYONS — high-priority violation on file	LYONS AREA, Boulder, CO	Pass	State
2023-07-19	CEMEX CONSTRUCTION MATERIALS - LYONS — high-priority violation on file	LYONS AREA, Boulder, CO	Fail	State
2023-07-18	STONE SAND & GRAVEL - WALLACE PIT	DOLORES AREA, Montezuma, CO	Fail	State
2023-07-17	BONANZA CREEK - STATE SEVENTY HOLES P-4	KERSEY 11.0 MI. E OF, Weld, CO	Pass	State
2023-07-14	DUNAMIS ENERGY - COLORADO LAKES WELL PAD	SEVERANCE 2.7 MI. N OF, Weld, CO	Pass	State
2023-07-13	ALLIED WASTE SYSTEMS - TOWER LANDFILL	COMMERCE CITY, Adams, CO	Pass	State
2023-07-11	DCP OPERATING CO - MEWBOURN — high-priority violation on file	GILCREST 2.4 MI. N OF, Weld, CO	Pass	State
2023-07-11	DCP OPERATING CO - WELLS RANCH CS	KERSEY 7.7 MI. NE OF, Weld, CO	Pass	State
2023-07-11	DCP OPERATING CO - WELLS RANCH CS	KERSEY 7.7 MI. NE OF, Weld, CO	Pass	State
2023-07-11	DCP OPERATING CO - WELLS RANCH CS	KERSEY 7.7 MI. NE OF, Weld, CO	Pass	State
2023-07-11	DCP OPERATING CO - WELLS RANCH CS	KERSEY 7.7 MI. NE OF, Weld, CO	Pass	State
2023-07-10	DCP OPERATING CO - ROCKY TURBINE CS	KERSEY 8.6 MI. NE OF, Weld, CO	Pass	State
2023-07-10	DCP OPERATING CO - ROCKY TURBINE CS	KERSEY 8.6 MI. NE OF, Weld, CO	Pass	State
2023-07-06	NOBLE ENERGY - WELLS RANCH AA24, AA23, B	KERSEY 9.4 MI. NE OF, Weld, CO	Pass	State
2023-07-03	NOBLE ENERGY - CUTTHROAT,BROOK,RAINBOW	RAYMER (NEW RAYMER) 10.0 MI. N, Weld, CO	Pass	State
2023-06-29	PDC ENERGY, INC. - SANFORD 21-29 PAD	EVANS AREA, Weld, CO	Fail	State
2023-06-28	BLACK HILLS ELECTRIC GENERATION - PAGS	PUEBLO, Pueblo, CO	Pass	State
2023-06-28	BLACK HILLS ELECTRIC GENERATION - PAGS	PUEBLO, Pueblo, CO	Pass	State
2023-06-28	PDC ENERGY, INC. - SANFORD 21-29 PAD	EVANS AREA, Weld, CO	Fail	State
2023-06-27	BLACK HILLS ELECTRIC GENERATION - PAGS	PUEBLO, Pueblo, CO	Pass	State
2023-06-27	BLACK HILLS ELECTRIC GENERATION - PAGS	PUEBLO, Pueblo, CO	Pass	State
2023-06-27	PDC ENERGY, INC. - SANFORD 21-29 PAD	EVANS AREA, Weld, CO	Fail	State
2023-06-26	PDC ENERGY - FAGERBERG 33-12	EATON AREA, Weld, CO	Pass	State
2023-06-26	PDC ENERGY - MCNEAR 10-9 PAD	GREELEY AREA, Weld, CO	Pass	State
2023-06-23	SUMMIT DJ-S - JACKSON LAKE GAS PLANT — high-priority violation on file	WELDONA, Morgan, CO	Pending	State
2023-06-23	PDC -BLUFF FED/GREELY-ROTHE FED 16-1 PAD	GREELEY, Weld, CO	Pass	State
2023-06-22	PDC ENERGY - GOETZEL 7-29 & 25-29 — high-priority violation on file	GREELEY AREA, Weld, CO	Pass	State
2023-06-21	MULL DRILLING CO - NWAU #4 TANK BATTERY	CHEYENNE WELLS 10.8 MI. E OF, Cheyenne, CO	Pass	State
2023-06-21	MULL DRILLING CO - NWAU WATER PLANT	ARAPAHOE AREA, Cheyenne, CO	Pass	State
2023-06-21	RED ROCK GATHERING - DEBEQUE PROC FAC	DEBEQUE AREA, Mesa, CO	Pass	State
2023-06-20	MULL DRILLING - NWAU #5 TANK BATTERY	CHEYENNE WELLS 12.4 MI. E OF, Cheyenne, CO	Pass	State
2023-06-20	MULL DRILLING - NWAU #6 TANK BATTERY	CHEYENNE WELLS 10.1 MI. E OF, Cheyenne, CO	Pass	State
2023-06-20	WES DJ GATHERING - FREDERICK CS — high-priority violation on file	DACONO AREA, Weld, CO	Pass	State
2023-06-19	MULL DRILLING - NWAU #1 TANK BATTERY	CHEYENNE WELLS 9.8 MI. NE OF, Cheyenne, CO	Pass	State
2023-06-19	MULL DRILLING - NWAU #2 TANK BATTERY — high-priority violation on file	CHEYENNE WELLS 9.2 MI. NE OF, Cheyenne, CO	Pass	State
2023-06-19	MULL DRILLING - NWAU #3 TANK BATTERY	CHEYENNE WELLS 9.8 MI. N OF, Cheyenne, CO	Pass	State
2023-06-19	WES DJ GATHERING - FREDERICK CS — high-priority violation on file	DACONO AREA, Weld, CO	Pass	State
2023-06-16	PDC ENERGY - BOST FARM 5-7 PAD	GREELEY, Weld, CO	Pass	State
2023-06-15	PUBLIC SERVICE CO - FORT SAINT VRAIN PLT	MILLIKEN AREA, Weld, CO	N/A	State
2023-06-15	PDC ENERGY - BEEBE 3-34 PAD	GREELEY, Weld, CO	Pass	State
2023-06-15	PDC ENERGY, INC. - GOLDEN EAGLE HZ	SEVERANCE AREA, Weld, CO	Pass	State
2023-06-14	ROCKY MOUNTAIN MIDSTREAM - MUSTANG CS — high-priority violation on file	LA SALLE 8.4 MI. N OF, Weld, CO	Pass	State
2023-06-14	ROCKY MOUNTAIN MIDSTREAM - MUSTANG CS — high-priority violation on file	LA SALLE 8.4 MI. N OF, Weld, CO	Pass	State
2023-06-13	PRAIRIE OPERATING - BURROUGHS PROD FAC	EATON 3.7 MI. N OF, Weld, CO	Pass	State
2023-06-13	ROCKY MOUNTAIN MIDSTREAM - MUSTANG CS — high-priority violation on file	LA SALLE 8.4 MI. N OF, Weld, CO	Pass	State
2023-06-13	ROCKY MOUNTAIN MIDSTREAM - MUSTANG CS — high-priority violation on file	LA SALLE 8.4 MI. N OF, Weld, CO	Pass	State
2023-06-12	ROCKY MOUNTAIN MIDSTREAM - MUSTANG CS — high-priority violation on file	LA SALLE 8.4 MI. N OF, Weld, CO	Pass	State
2023-06-12	ROCKY MOUNTAIN MIDSTREAM - MUSTANG CS — high-priority violation on file	LA SALLE 8.4 MI. N OF, Weld, CO	Pass	State
2023-06-06	AMRIZE PORTLAND PLANT — high-priority violation on file	FLORENCE 3.8 MI. E OF, Fremont, CO	Pass	State
2023-06-06	DCP OPERATING CO - SULLIVAN C.S.	KERSEY 16.1 MI. NE OF, Weld, CO	Pass	State
2023-06-05	RED ROCK GATHERING - RIFLE CLOUGH C.S. — high-priority violation on file	RIFLE, Garfield, CO	Pass	State
2023-06-05	RED ROCK GATHERING- RIFLE BOULTON C.S.	RIFLE AREA, Garfield, CO	Pass	State
2023-05-26	ANSCHUTZ - WILEY 23-3-97-1	MEEKER 20.1 MI. NW OF, Rio Blanco, CO	Pass	State
2023-05-24	BARNARD CONST - CHIMNEY HOLLOW RESERVOIR	LOVELAND AREA, Larimer, CO	Fail	State
2023-05-23	ROCKY MOUNTAIN MIDSTREAM - POWHATON C.S.	BRIGHTON 3.0 MI. E OF, Adams, CO	Pass	State
2023-05-23	ROCKY MOUNTAIN MIDSTREAM - POWHATON C.S.	BRIGHTON 3.0 MI. E OF, Adams, CO	Pass	State
2023-05-23	ROCKY MOUNTAIN MIDSTREAM - POWHATON C.S.	BRIGHTON 3.0 MI. E OF, Adams, CO	Pass	State
2023-05-23	WES DJ GATHERING - FREDERICK CS — high-priority violation on file	DACONO AREA, Weld, CO	Pass	State
2023-05-23	WES DJ GATHERING - FREDERICK CS — high-priority violation on file	DACONO AREA, Weld, CO	Pass	State
2023-05-23	DCP OPERATING CO - GODFREY BOTTOM C.S.	EVANS AREA, Weld, CO	Pass	State
2023-05-23	DCP OPERATING CO - GODFREY BOTTOM C.S.	EVANS AREA, Weld, CO	Pass	State
2023-05-23	OWN RESOURCES OPERATING - BUCKBOARD C.S.	ECKLEY 8.7 MI. N OF, Yuma, CO	Pass	State
2023-05-22	ROCKY MOUNTAIN MIDSTREAM - POWHATON C.S.	BRIGHTON 3.0 MI. E OF, Adams, CO	Pass	State
2023-05-18	WASTE CONNECTIONS - SOUTHSIDE LANDFILL	PUEBLO, Pueblo, CO	N/A	State
2023-05-18	BARGATH - RYAN GULCH COMPRESSOR STATION — high-priority violation on file	MEEKER 23.2 MI. W OF, Rio Blanco, CO	Pass	State
2023-05-18	BARGATH - RYAN GULCH COMPRESSOR STATION — high-priority violation on file	MEEKER 23.2 MI. W OF, Rio Blanco, CO	Pass	State
2023-05-18	BARGATH - RYAN GULCH COMPRESSOR STATION — high-priority violation on file	MEEKER 23.2 MI. W OF, Rio Blanco, CO	Pass	State
2023-05-17	BARGATH - RYAN GULCH COMPRESSOR STATION — high-priority violation on file	MEEKER 23.2 MI. W OF, Rio Blanco, CO	Pass	State
2023-05-16	BARGATH - RYAN GULCH COMPRESSOR STATION — high-priority violation on file	MEEKER 23.2 MI. W OF, Rio Blanco, CO	Pass	State
2023-05-15	PDC ENERGY - MCNEAR 10-9 PAD	GREELEY AREA, Weld, CO	Pass	State
2023-05-12	SUMMIT DJ-S - CENTENNIAL GAS PLANT	GROVER 10.7 MI. S OF, Weld, CO	Pass	State
2023-05-11	GRAND RIVER GATHERING - HUNTER MESA CS	RIFLE 3.3 MI. SE OF, Garfield, CO	Pass	State
2023-05-11	GRAND RIVER GATHERING - HUNTER MESA CS	RIFLE 3.3 MI. SE OF, Garfield, CO	Pass	State
2023-05-10	GRAND RIVER GATHERING - HUNTER MESA CS	RIFLE 3.3 MI. SE OF, Garfield, CO	Pass	State
2023-05-10	COLORADO INTERSTATE GAS CO - CHEYENNE CS — high-priority violation on file	NUNN 14.8 MI. N OF, Weld, CO	Pass	State
2023-05-10	DCP OPERATING CO - SULLIVAN C.S.	KERSEY 16.1 MI. NE OF, Weld, CO	Pass	State
2023-05-10	DCP OPERATING CO - SULLIVAN C.S.	KERSEY 16.1 MI. NE OF, Weld, CO	Pass	State
2023-05-10	DCP OPERATING CO - TROUDT C.S.	GREELEY, Weld, CO	Pass	State
2023-05-10	DCP OPERATING CO - TROUDT C.S.	GREELEY, Weld, CO	Pass	State
2023-05-09	WES DJ GAS PROC - WATTENBERG PLANT	AURORA, Adams, CO	Pass	State
2023-05-09	GRAND RIVER GATHERING - HUNTER MESA CS	RIFLE 3.3 MI. SE OF, Garfield, CO	Pass	State
2023-05-09	COLORADO INTERSTATE GAS CO - CHEYENNE CS — high-priority violation on file	NUNN 14.8 MI. N OF, Weld, CO	Pass	State
2023-05-09	WES DJ FT LUPTON/PLATTE VALLEY/LANCASTER — high-priority violation on file	FORT LUPTON, Weld, CO	Pass	State
2023-05-09	DCP OPERATING CO - SULLIVAN C.S.	KERSEY 16.1 MI. NE OF, Weld, CO	Pass	State
2023-05-08	GRAND RIVER GATHERING - HUNTER MESA CS	RIFLE 3.3 MI. SE OF, Garfield, CO	Pass	State
2023-05-06	WES DJ FT LUPTON/PLATTE VALLEY/LANCASTER — high-priority violation on file	FORT LUPTON, Weld, CO	Pass	State
2023-05-04	RED ROCK GATHERING - DEBEQUE PROC FAC	DEBEQUE AREA, Mesa, CO	Pass	State
2023-05-04	RED ROCK GATHERING - DEBEQUE PROC FAC	DEBEQUE AREA, Mesa, CO	Pass	State
2023-05-04	DCP OPERATING CO - LUCERNE 2 GAS PLANT — high-priority violation on file	GREELEY AREA, Weld, CO	Pass	State
2023-05-04	DCP OPERATING CO - LUCERNE 2 GAS PLANT — high-priority violation on file	GREELEY AREA, Weld, CO	Pass	State
2023-05-03	RED ROCK GATHERING - HOLMES MESA CS	RIFLE 5.2 MI. SW OF, Garfield, CO	Pass	State
2023-05-03	WEXPRO CO - POWDER WASH	CRAIG 47.7 MI. NW OF, Moffat, CO	Pass	State
2023-05-03	WES DJ FT LUPTON/PLATTE VALLEY/LANCASTER — high-priority violation on file	FORT LUPTON, Weld, CO	Pass	State
2023-05-03	DCP OPERATING CO - ENTERPRISE C.S. — high-priority violation on file	KEENESBURG 5.2 MI. N OF, Weld, CO	Pass	State
2023-05-02	RED ROCK GATHERING - HOLMES MESA CS	RIFLE 5.2 MI. SW OF, Garfield, CO	Pass	State
2023-05-02	MOLSON COORS USA - GOLDEN FACILITY	GOLDEN, Jefferson, CO	Pass	State
2023-05-01	RED ROCK GATHERING - HOLMES MESA CS	RIFLE 5.2 MI. SW OF, Garfield, CO	Pass	State
2023-05-01	MOLSON COORS USA - GOLDEN FACILITY	GOLDEN, Jefferson, CO	Pass	State

Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.