EPA Air · stack tests by state and year

Air-emissions stack tests in Colorado, 2026

185Stack 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 2026; one facility can appear more than once, because this is a record of what happened rather than a list of places.

Counties in Colorado, 2026

Colorado, other years

Air-emissions stack tests recorded in Colorado, 2026

Date	Facility	Where	Kind	Agency
2026-09-08	BONANZA CRK STATE NORTH PLATTE CPF 42-26	KERSEY 7.1 MI. N OF, Weld, CO	Pending	State
2026-09-02	DCP OPERATING CO - CROSSROADS FACILITY	KERSEY 5.0 MI. N OF, Weld, CO	Pending	State
2026-08-17	CEMEX CONSTRUCTION MATERIALS - LYONS — high-priority violation on file	LYONS AREA, Boulder, CO	N/A	State
2026-08-11	BONANZA CREEK ENERGY - ANTELOPE SECTION	KERSEY 9.2 MI. E OF, Weld, CO	Pass	State
2026-08-06	BLACK HILLS ELECTRIC GENERATION - PAGS	PUEBLO, Pueblo, CO	Pass	State
2026-07-28	MOLSON COORS USA LLC - GOLDEN BREWERY — high-priority violation on file	GOLDEN AREA, Jefferson, CO	Pending	State
2026-07-28	MOLSON COORS USA LLC - GOLDEN BREWERY — high-priority violation on file	GOLDEN AREA, Jefferson, CO	Pending	State
2026-07-24	PLATTE RIVER POWER AUTHORITY - RAWHIDE	WELLINGTON 9.3 MI. N OF, Larimer, CO	Pass	State
2026-07-23	AMERICAN GYPSUM COMPANY	GYPSUM, Eagle, CO	Pass	State
2026-07-23	AMERICAN GYPSUM COMPANY	GYPSUM, Eagle, CO	Pass	State
2026-07-23	AMERICAN GYPSUM COMPANY	GYPSUM, Eagle, CO	Pass	State
2026-07-23	PLATTE RIVER POWER AUTHORITY - RAWHIDE	WELLINGTON 9.3 MI. N OF, Larimer, CO	Pass	State
2026-07-22	AMERICAN GYPSUM COMPANY	GYPSUM, Eagle, CO	Pass	State
2026-07-22	AMERICAN GYPSUM COMPANY	GYPSUM, Eagle, CO	Pass	State
2026-07-22	NYDIG DFM - SURPRISE S4 FACILITY	WALDEN AREA, Jackson, CO	N/A	State
2026-07-22	ENTERPRISE GAS PROC - MEEKER GAS PLANT — high-priority violation on file	MEEKER 21.1 MI. W OF, Rio Blanco, CO	Fail	State
2026-07-21	AMERICAN GYPSUM COMPANY	GYPSUM, Eagle, CO	Pass	State
2026-07-21	DCP OPERATING CO - LUCERNE 2 GAS PLANT — high-priority violation on file	GREELEY AREA, Weld, CO	N/A	State
2026-07-16	NRO - AEROSPACE DATA FACIITY (ADF-C)	AURORA, Arapahoe, CO	Pass	State
2026-07-16	ENTERPRISE GAS PROC - MEEKER GAS PLANT — high-priority violation on file	MEEKER 21.1 MI. W OF, Rio Blanco, CO	N/A	State
2026-07-15	NRO - AEROSPACE DATA FACIITY (ADF-C)	AURORA, Arapahoe, CO	Pass	State
2026-07-15	NRO - AEROSPACE DATA FACIITY (ADF-C)	AURORA, Arapahoe, CO	Pass	State
2026-07-14	NRO - AEROSPACE DATA FACIITY (ADF-C)	AURORA, Arapahoe, CO	Pass	State
2026-07-14	NRO - AEROSPACE DATA FACIITY (ADF-C)	AURORA, Arapahoe, CO	Pass	State
2026-07-14	PUBLIC SERVICE CO - HAYDEN PLT	HAYDEN, Routt, CO	Pass	State
2026-07-14	PUBLIC SERVICE CO - HAYDEN PLT	HAYDEN, Routt, CO	Pass	State
2026-07-14	DCP OPERATING CO - O'CONNOR GAS PLANT	KERSEY AREA, Weld, CO	Pass	State
2026-07-13	NRO - AEROSPACE DATA FACIITY (ADF-C)	AURORA, Arapahoe, CO	Pass	State
2026-07-13	NRO - AEROSPACE DATA FACIITY (ADF-C)	AURORA, Arapahoe, CO	Pass	State
2026-07-10	EXTRACTION O&G - ALMA 1S-66-2524	DENVER, Adams, CO	Pass	State
2026-07-10	NRO - AEROSPACE DATA FACIITY (ADF-C)	AURORA, Arapahoe, CO	Pass	State
2026-07-09	EXTRACTION O&G - ALMA 1S-66-2524	DENVER, Adams, CO	Pass	State
2026-07-09	NRO - AEROSPACE DATA FACIITY (ADF-C)	AURORA, Arapahoe, CO	Pass	State
2026-07-09	MAGELLAN PIPELINE CO - FOUNTAIN TERMINAL	FOUNTAIN, El Paso, CO	N/A	State
2026-07-09	COORSTEK INC - CLEAR CREEK VALLEY PLANT — high-priority violation on file	GOLDEN AREA, Jefferson, CO	N/A	State
2026-07-08	NRO - AEROSPACE DATA FACIITY (ADF-C)	AURORA, Arapahoe, CO	Pass	State
2026-07-08	BONANZA CREEK - ANTELOPE CPF 13-21	KERSEY 10.4 MI. E OF, Weld, CO	Pass	State
2026-07-07	BONANZA CREEK - ANTELOPE CPF 13-21	KERSEY 10.4 MI. E OF, Weld, CO	Pass	State
2026-07-07	BONANZA CREEK - ANTELOPE CPF 13-21	KERSEY 10.4 MI. E OF, Weld, CO	Pass	State
2026-06-30	KODAK ALARIS - KODAK MOMENTS COLORADO — high-priority violation on file	WINDSOR AREA, Weld, CO	Pass	State
2026-06-29	LEPRINO FOODS COMPANY - GREELEY PLANT	GREELEY, Weld, CO	N/A	State
2026-06-26	COORSTEK INC - CLEAR CREEK VALLEY PLANT — high-priority violation on file	GOLDEN AREA, Jefferson, CO	Fail	State
2026-06-26	ANSCHUTZ - WILEY 23-3-97-1	MEEKER 20.1 MI. NW OF, Rio Blanco, CO	Pass	State
2026-06-25	ROCKIES EXPRESS PIPELINE - BIG HOLE CS	CRAIG 30.5 MI. NW OF, Moffat, CO	Pass	State
2026-06-23	DCP OPERATING CO - ROCKY TURBINE CS	KERSEY 8.6 MI. NE OF, Weld, CO	Pass	State
2026-06-23	DCP OPERATING CO - ROCKY TURBINE CS	KERSEY 8.6 MI. NE OF, Weld, CO	Pass	State
2026-06-19	DCP OPERATING CO - O'CONNOR GAS PLANT	KERSEY AREA, Weld, CO	Pass	State
2026-06-18	PUBLIC SERVICE CO - CHEROKEE PLT	COMMERCE CITY AREA, Adams, CO	Pass	State
2026-06-18	TRI STATE GENERATION & TRANS - CRAIG	CRAIG 2.9 MI. SW OF, Moffat, CO	Pending	State
2026-06-17	BARGATH LLC - PARACHUTE CREEK GAS PLANT	PARACHUTE 2.9 MI. NW OF, Garfield, CO	Pass	State
2026-06-17	BARGATH LLC - PARACHUTE CREEK GAS PLANT	PARACHUTE 2.9 MI. NW OF, Garfield, CO	Pass	State
2026-06-17	COORSTEK INC - CLEAR CREEK VALLEY PLANT — high-priority violation on file	GOLDEN AREA, Jefferson, CO	N/A	State
2026-06-17	COORSTEK INC - CLEAR CREEK VALLEY PLANT — high-priority violation on file	GOLDEN AREA, Jefferson, CO	N/A	State
2026-06-16	BARGATH LLC - PARACHUTE CREEK GAS PLANT	PARACHUTE 2.9 MI. NW OF, Garfield, CO	Pass	State
2026-06-16	BARGATH LLC - PARACHUTE CREEK GAS PLANT	PARACHUTE 2.9 MI. NW OF, Garfield, CO	Pending	State
2026-06-16	DCP OPERATING CO - ENTERPRISE C.S. — high-priority violation on file	KEENESBURG 5.2 MI. N OF, Weld, CO	Pass	State
2026-06-11	BLACK HILLS ELECTRIC GENERATION - PAGS	PUEBLO, Pueblo, CO	Pass	State
2026-06-10	QB ENERGY - E28OU SWD FACILITY	DE BEQUE 2.7 MI. N OF, Garfield, CO	Pass	State
2026-06-10	BLACK HILLS ELECTRIC GENERATION - PAGS	PUEBLO, Pueblo, CO	Pass	State
2026-06-09	BLACK HILLS ELECTRIC GENERATION - PAGS	PUEBLO, Pueblo, CO	Pass	State
2026-06-09	BLACK HILLS ELECTRIC GENERATION - PAGS	PUEBLO, Pueblo, CO	Pass	State
2026-06-09	PDC ENERGY, INC - LAWERENCE 33 SEC HZ	EATON AREA, Weld, CO	Pass	State
2026-06-08	BLACK HILLS ELECTRIC GENERATION - PAGS	PUEBLO, Pueblo, CO	Pass	State
2026-06-05	SUMMIT COUNTY LANDFILL	DILLON AREA, Summit, CO	Pass	State
2026-05-28	PDC ENERGY, INC. - GOLDEN EAGLE HZ	SEVERANCE AREA, Weld, CO	Pass	State
2026-05-26	HIGHPOINT - HAWKINS 5-61-21	WIGGINS 12.7 MI. NW OF, Weld, CO	N/A	State
2026-05-14	KT RESOURCES - WHITE RIVER DOME	MEEKER 14.5 MI. W OF, Rio Blanco, CO	Pass	State
2026-05-14	PDC ENERGY - BEEBE 3-34 PAD	GREELEY, Weld, CO	Pass	State
2026-05-13	KT RESOURCES - WHITE RIVER DOME	MEEKER 14.5 MI. W OF, Rio Blanco, CO	Pass	State
2026-05-13	HIGHPOINT OPERATING -CIRCLE B 5-61-27 CS	ORCHARD 4.0 MI. N OF, Weld, CO	Pass	State
2026-05-12	QB ENERGY OPERATING - O29 596 SWD	PARACHUTE 10.4 MI. NW OF, Garfield, CO	Pass	State
2026-05-12	LARAMIE ENERGY - HAWXHURST RANCH	COLLBRAN AREA, Mesa, CO	Pass	State
2026-05-11	QB ENERGY OPERATING - STORY GULCH C.S. — high-priority violation on file	PARACHUTE 13.8 MI. N OF, Garfield, CO	Pass	State
2026-05-11	QB ENERGY OPERATING - STORY GULCH C.S. — high-priority violation on file	PARACHUTE 13.8 MI. N OF, Garfield, CO	Pass	State
2026-05-06	AMRIZE PORTLAND PLANT — high-priority violation on file	FLORENCE 3.8 MI. E OF, Fremont, CO	Pass	State
2026-05-05	AMRIZE PORTLAND PLANT — high-priority violation on file	FLORENCE 3.8 MI. E OF, Fremont, CO	Pass	State
2026-05-04	ALLIED WASTE SYSTEMS - TOWER LANDFILL	COMMERCE CITY, Adams, CO	Pending	State
2026-05-01	PLAINS END, LLC	ARVADA, Jefferson, CO	Pass	State
2026-04-30	PLAINS END, LLC	ARVADA, Jefferson, CO	Pass	State
2026-04-29	PUBLIC SERVICE CO - CHEROKEE PLT	COMMERCE CITY AREA, Adams, CO	Pass	State
2026-04-29	PLAINS END, LLC	ARVADA, Jefferson, CO	Pass	State
2026-04-28	MICROCHIP TECHNOLOGY INCORPORATED	COLORADO SPRINGS, El Paso, CO	Pass	State
2026-04-28	PLAINS END, LLC	ARVADA, Jefferson, CO	Pass	State
2026-04-27	PLAINS END, LLC	ARVADA, Jefferson, CO	Pass	State
2026-04-27	PUBLIC SERVICE CO - HAYDEN PLT	HAYDEN, Routt, CO	Pass	State
2026-04-27	PDC ENERGY - LEFFLER 8-21, DONN 1-21 PAD	GREELEY, Weld, CO	N/A	State
2026-04-24	UTAH GAS - DRAGON TRAIL — high-priority violation on file	RANGELY 16.7 MI. S OF, Rio Blanco, CO	Pass	State
2026-04-23	LARAMIE ENERGY - MVS COMPRESSOR STATION	COLLBRAN 10.8 MI. E OF, Mesa, CO	Pass	State
2026-04-23	UGC MIDSTREAM - FOUNDATION CREEK CS — high-priority violation on file	RANGELY 27.5 MI. S OF, Rio Blanco, CO	Pass	State
2026-04-23	DCP OPERATING CO - MEWBOURN — high-priority violation on file	GILCREST 2.4 MI. N OF, Weld, CO	Pass	State
2026-04-22	LARAMIE ENERGY - MVS COMPRESSOR STATION	COLLBRAN 10.8 MI. E OF, Mesa, CO	Pass	State
2026-04-22	UTAH GAS - DRAGON TRAIL — high-priority violation on file	RANGELY 16.7 MI. S OF, Rio Blanco, CO	Pass	State
2026-04-22	HIGHPOINT - ANSCHUTZ EQUUS FARMS 4-62-28	ORCHARD 11.6 MI. N OF, Weld, CO	Pass	State
2026-04-22	HIGHPOINT - ANSCHUTZ EQUUS FARMS 4-62-28	ORCHARD 11.6 MI. N OF, Weld, CO	Pass	State
2026-04-21	CRESTONE PEAK - MUSTANG BOOSTER STATION — high-priority violation on file	AURORA, Adams, CO	Pass	State
2026-04-21	LARAMIE ENERGY - MVS COMPRESSOR STATION	COLLBRAN 10.8 MI. E OF, Mesa, CO	Pass	State
2026-04-21	UTAH GAS - DRAGON TRAIL — high-priority violation on file	RANGELY 16.7 MI. S OF, Rio Blanco, CO	Pass	State
2026-04-21	DCP OPERATING CO - MEWBOURN — high-priority violation on file	GILCREST 2.4 MI. N OF, Weld, CO	Pass	State
2026-04-21	DCP OPERATING CO - MEWBOURN — high-priority violation on file	GILCREST 2.4 MI. N OF, Weld, CO	Pass	State
2026-04-21	WES DJ GATHERING - FREDERICK CS — high-priority violation on file	DACONO AREA, Weld, CO	Pass	State

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