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.

What this page shows

This page covers Clean Air Act facilities in the EPA air register with stack tests in CO for 2023. It lists 436 stack tests recorded in 2023.