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
2023-12-19	DCP OPERATING CO - LUCERNE 2 GAS PLANT — high-priority violation on file	GREELEY AREA, Weld, CO	Pass	State
2023-12-18	GOODRICH CORP - AIRCRAFT WHEELS & BRAKES	PUEBLO AREA, Pueblo, CO	Pass	State
2023-12-14	NYDIG DFM - GREGORY 0780 1-9H	WALDEN 11.2 MI. N OF, Jackson, CO	Pass	State
2023-12-14	PUBLIC SERVICE CO - HAYDEN PLT	HAYDEN, Routt, CO	Pass	State
2023-12-14	KERR-MCGEE O&G - PAUL NELSON 25-29HZ	JOHNSTOWN AREA, Weld, CO	Pass	State
2023-12-13	DCP OPERATING CO - SPINDLE GAS PLANT	FREDERICK AREA, Weld, CO	Pass	State
2023-12-12	ROCKY MT MIDSTREAM- KEENESBURG GAS PLANT	KEENESBURG, Weld, CO	Pass	State
2023-12-11	DCP OPERATING CO - GREELEY NATURAL GAS P	EVANS AREA, Weld, CO	Pass	State
2023-12-08	ASPHALT SPECIALTIES - STILES MINING RESO	EVANS, Weld, CO	Fail	State
2023-12-07	ASPHALT SPECIALTIES - STILES MINING RESO	EVANS, Weld, CO	N/A	State
2023-12-06	WILLIAMS FIELD - WILLOW CREEK GAS PLANT — high-priority violation on file	RIO BLANCO 18 MILES W OF, Rio Blanco, CO	Pass	State
2023-12-06	WILLIAMS FIELD - WILLOW CREEK GAS PLANT — high-priority violation on file	RIO BLANCO 18 MILES W OF, Rio Blanco, CO	Pass	State
2023-12-06	WILLIAMS FIELD - WILLOW CREEK GAS PLANT — high-priority violation on file	RIO BLANCO 18 MILES W OF, Rio Blanco, CO	Pass	State
2023-12-05	BONANZA CRK STATE NORTH PLATTE CPF 42-26	KERSEY 7.1 MI. N OF, Weld, CO	Fail	State
2023-12-05	BONANZA CRK STATE NORTH PLATTE CPF 42-26	KERSEY 7.1 MI. N OF, Weld, CO	Fail	State
2023-12-04	PDC ENERGY - FALKEN 9-11	EATON AREA, Weld, CO	Pass	State
2023-12-04	B&B ELEC MOTOR SVC INC - SHOP	WRAY AREA, Yuma, CO	Pass	State
2023-12-04	B&B ELEC MOTOR SVC INC - SHOP	WRAY AREA, Yuma, CO	Pass	State
2023-11-30	BARGATH LLC - PARACHUTE CREEK GAS PLANT	PARACHUTE 2.9 MI. NW OF, Garfield, CO	Pass	State
2023-11-30	BARGATH LLC - PARACHUTE CREEK GAS PLANT	PARACHUTE 2.9 MI. NW OF, Garfield, CO	Pass	State
2023-11-30	BIOCHAR NOW, LLC - BERTHOUD PLANT	BERTHOUD, Weld, CO	Pass	State
2023-11-29	OWN RESOURCES OPERATING - WHISPER C.S.	YUMA 8.3 MI. NE OF, Yuma, CO	Pass	State
2023-11-28	PLATTE RIVER POWER AUTHORITY - RAWHIDE	WELLINGTON 9.3 MI. N OF, Larimer, CO	Pass	State
2023-11-21	AMRIZE PORTLAND PLANT — high-priority violation on file	FLORENCE 3.8 MI. E OF, Fremont, CO	Pass	State
2023-11-20	PDC ENERGY - WARD 20 SEC HZ	GREELEY, Weld, CO	Pass	State
2023-11-17	LARAMIE ENERGY - CONN CREEK GAS — high-priority violation on file	PARACHUTE 10.1 MI. W OF, Garfield, CO	Pass	State
2023-11-16	LARAMIE ENERGY - CONN CREEK GAS — high-priority violation on file	PARACHUTE 10.1 MI. W OF, Garfield, CO	Pass	State
2023-11-16	LARAMIE ENERGY - CONN CREEK GAS — high-priority violation on file	PARACHUTE 10.1 MI. W OF, Garfield, CO	Pass	State
2023-11-15	LARAMIE ENERGY - CONN CREEK GAS — high-priority violation on file	PARACHUTE 10.1 MI. W OF, Garfield, CO	Pass	State
2023-11-15	LARAMIE ENERGY - CONN CREEK GAS — high-priority violation on file	PARACHUTE 10.1 MI. W OF, Garfield, CO	Pass	State
2023-11-14	LARAMIE ENERGY - CONN CREEK GAS — high-priority violation on file	PARACHUTE 10.1 MI. W OF, Garfield, CO	Pass	State
2023-11-14	LARAMIE ENERGY - CONN CREEK GAS — high-priority violation on file	PARACHUTE 10.1 MI. W OF, Garfield, CO	Pass	State
2023-11-14	PRAIRIE OPERATING CO - WEST EATON 2-A	EATON AREA, Weld, CO	Pass	State
2023-11-10	VERDAD RESOURCES - ROHN 1423 PAD	GROVER 11.4 MI. N OF, Weld, CO	Pass	State
2023-11-09	SUNCOR ENERGY - DENVER REFINERY — high-priority violation on file	COMMERCE CITY, Adams, CO	Pass	State
2023-11-09	WES DJ GAS PROC - WATTENBERG PLANT	AURORA, Adams, CO	Pass	State
2023-11-09	LARAMIE ENERGY - CONN CREEK GAS — high-priority violation on file	PARACHUTE 10.1 MI. W OF, Garfield, CO	Pass	State
2023-11-09	VERDAD RESOURCES LLC - BOYDSTON 3535 PAD	GROVER AREA, Weld, CO	Pass	State
2023-11-08	LARAMIE ENERGY - CONN CREEK GAS — high-priority violation on file	PARACHUTE 10.1 MI. W OF, Garfield, CO	Pass	State
2023-11-08	CHEVRON USA INC - PICEANCE BASIN CENTRAL	PARACHUTE 16.6 MI. NW OF, Garfield, CO	Pass	State
2023-11-08	MONTROSE FOREST PRODUCTS LLC	MONTROSE, Montrose, CO	Pass	State
2023-11-07	LARAMIE ENERGY - CONN CREEK GAS — high-priority violation on file	PARACHUTE 10.1 MI. W OF, Garfield, CO	Pass	State
2023-11-07	SOUTHERN STAR CENTRAL GAS PIPELINE CHEYE	NUNN 18.4 MI. N OF, Weld, CO	Pass	State
2023-11-07	DCP OPERATING CO - LIBSACK C.S.	GREELEY AREA, Weld, CO	Pass	State
2023-11-03	VERDAD RESOURCES - PEGGY 2501-2525 PAD	RAYMER (NEW RAYMER) 12.2 MI. N, Weld, CO	Pass	State
2023-11-03	COVALENCE DJ, LLC - BIGFOOT 11	KERSEY AREA, Weld, CO	Pass	State
2023-11-02	BONANZA CREEK - STATE PRONGHORN CPF 41-3	WIGGINS 11.6 MI. NW OF, Weld, CO	Fail	State
2023-11-02	BONANZA CREEK - STATE ANTELOPE CPF O-1	KERSEY 14.0 MI. E OF, Weld, CO	Fail	State
2023-11-02	PDC ENERGY - BOST FARM 5-7 PAD	GREELEY, Weld, CO	Fail	State
2023-11-02	PDC ENERGY - BOST FARM 5-7 PAD	GREELEY, Weld, CO	Fail	State
2023-11-01	BONANZA CREEK - ANTELOPE CPF 13-21	KERSEY 10.4 MI. E OF, Weld, CO	Pass	State
2023-11-01	BONANZA CREEK - ANTELOPE CPF 13-21	KERSEY 10.4 MI. E OF, Weld, CO	Fail	State
2023-11-01	BONANZA CREEK - ANTELOPE CPF 13-21	KERSEY 10.4 MI. E OF, Weld, CO	Fail	State
2023-11-01	PDC ENERGY - BOST FARM 5-7 PAD	GREELEY, Weld, CO	Fail	State
2023-11-01	PDC ENERGY - BOST FARM 5-7 PAD	GREELEY, Weld, CO	Fail	State
2023-10-31	COLORADO INTERSTATE GAS CO - LATIGO C.S.	DEER TRAIL 6.4 MI. W OF, Arapahoe, CO	Pass	State
2023-10-31	COLORADO INTERSTATE GAS CO - LATIGO C.S.	DEER TRAIL 6.4 MI. W OF, Arapahoe, CO	Pass	State
2023-10-31	GRAND RIVER GATHERING - HUNTER MESA CS	RIFLE 3.3 MI. SE OF, Garfield, CO	Pass	State
2023-10-31	BONANZA CREEK - ANTELOPE CPF 13-21	KERSEY 10.4 MI. E OF, Weld, CO	Fail	State
2023-10-31	BONANZA CREEK - ANTELOPE CPF 13-21	KERSEY 10.4 MI. E OF, Weld, CO	Pass	State
2023-10-31	BONANZA CREEK - ANTELOPE CPF 13-21	KERSEY 10.4 MI. E OF, Weld, CO	Fail	State
2023-10-31	PDC ENERGY - BOST FARM 5-7 PAD	GREELEY, Weld, CO	Fail	State
2023-10-31	PDC ENERGY - BOST FARM 5-7 PAD	GREELEY, Weld, CO	Fail	State
2023-10-30	BONANZA CRK STATE NORTH PLATTE CPF 42-26	KERSEY 7.1 MI. N OF, Weld, CO	Fail	State
2023-10-27	ENTERPRISE PRODUCTS OP- JACKRABBIT CS	PARACHUTE 9.5 MI. NW OF, Garfield, CO	Pass	State
2023-10-27	ENTERPRISE PRODUCTS OP- JACKRABBIT CS	PARACHUTE 9.5 MI. NW OF, Garfield, CO	Pass	State
2023-10-26	PLAINS END, LLC	ARVADA, Jefferson, CO	Pass	State
2023-10-26	PLAINS END, LLC	ARVADA, Jefferson, CO	Pass	State
2023-10-26	PLAINS END, LLC	ARVADA, Jefferson, CO	Pass	State
2023-10-26	PLAINS END, LLC	ARVADA, Jefferson, CO	Pass	State
2023-10-25	COLORADO SPRINGS UTILITIES - NIXON PLT	FOUNTAIN AREA, El Paso, CO	N/A	State
2023-10-25	WEXPRO - SUGAR LOAF COMPRESSOR STATION	DINOSAUR 50.4 MI. N OF, Moffat, CO	Pass	State
2023-10-25	WES DJ GATHERING - FREDERICK CS — high-priority violation on file	DACONO AREA, Weld, CO	Pass	State
2023-10-25	PRAIRIE OPERATING CO - PICKAROON TANK	EATON 6.0 MI. N OF, Weld, CO	Pass	State
2023-10-24	PDC - CECIL'S KERSEY FARM 17 SEC HZ	KERSEY AREA, Weld, CO	Pass	State
2023-10-23	AURORA CONV CENT- GAYLORD ROCKIES RESORT	AURORA, Adams, CO	Pass	State
2023-10-20	AMRIZE PORTLAND PLANT — high-priority violation on file	FLORENCE 3.8 MI. E OF, Fremont, CO	Pass	State
2023-10-20	BONANZA - LATHAM 11-13 PROD FACILITY	KERSEY 8.5 MI. N OF, Weld, CO	Pass	State
2023-10-18	WYOMING INTERSTATE - SNAKE RIVER C.S.	CRAIG 37.2 MI. NW OF, Moffat, CO	N/A	State
2023-10-18	WYOMING INTERSTATE - SNAKE RIVER C.S.	CRAIG 37.2 MI. NW OF, Moffat, CO	N/A	State
2023-10-18	COLORADO INTERSTATE GAS CO - GREASEWOOD	MEEKER 16.5 MI. SW OF, Rio Blanco, CO	Pass	State
2023-10-18	ROCKIES EXPRESS PIPELINE LLC - MEEKER	MEEKER 21.0 MI. N OF, Rio Blanco, CO	Pass	State
2023-10-18	ROCKIES EXPRESS PIPELINE LLC - MEEKER	MEEKER 21.0 MI. N OF, Rio Blanco, CO	Pass	State
2023-10-17	UNIV OF COLO BOULDER - CAMPUS — high-priority violation on file	BOULDER, Boulder, CO	N/A	State
2023-10-17	COVALENCE DJ, LLC - BIGFOOT 11	KERSEY AREA, Weld, CO	Fail	State
2023-10-16	PUBLIC SERVICE CO - RIFLE COMP STATION	RIFLE AREA, Garfield, CO	Pass	State
2023-10-16	WASTE MANAGEMENT- BUFFALO RIDGE LANDFILL	KEENESBURG 5.1 MI. N OF, Weld, CO	N/A	State
2023-10-12	PDC ENERGY - LINCOLN STATE 3-18 PAD	SEVERANCE AREA, Weld, CO	Pass	State
2023-10-12	BONANZA - LATHAM 11-13 PROD FACILITY	KERSEY 8.5 MI. N OF, Weld, CO	Pass	State
2023-10-11	BLACK HILLS ELECTRIC GENERATION - PAGS	PUEBLO, Pueblo, CO	Pass	State
2023-10-11	BLACK HILLS ELECTRIC GENERATION - PAGS	PUEBLO, Pueblo, CO	Pass	State
2023-10-11	PDC ENERGY - LINCOLN STATE 3-18 PAD	SEVERANCE AREA, Weld, CO	Pass	State
2023-10-11	PDC ENERGY - LINCOLN STATE 3-18 PAD	SEVERANCE AREA, Weld, CO	Pass	State
2023-10-10	MID-AMERICA PIPELINE CO DOVE CR STA	DOVE CREEK 5.3 MI. NW OF, Dolores, CO	Pass	State
2023-10-10	WES DJ FT LUPTON/PLATTE VALLEY/LANCASTER — high-priority violation on file	FORT LUPTON, Weld, CO	Pass	State
2023-10-10	PDC ENERGY - LINCOLN STATE 3-18 PAD	SEVERANCE AREA, Weld, CO	N/A	State
2023-10-09	KERR-MCGEE - X10017 34002054 BROWN 35NHZ	PLATTEVILLE 3.7 MI. SE OF, Weld, CO	Pass	State
2023-10-09	VERDAD RESOURCES - TIMBRO 9-59 8B PAD	GROVER 12.9 MI. N OF, Weld, CO	Pass	State
2023-10-05	WES DJ FT LUPTON/PLATTE VALLEY/LANCASTER — high-priority violation on file	FORT LUPTON, Weld, CO	Pass	State
2023-10-03	PUBLIC SERVICE CO - COMANCHE PLT — high-priority violation on file	PUEBLO, Pueblo, CO	Pass	State

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