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
2026-04-21	PDC ENERGY, INC - LAWERENCE 33 SEC HZ	EATON AREA, Weld, CO	Pass	State
2026-04-21	PDC ENERGY, INC - LAWERENCE 33 SEC HZ	EATON AREA, Weld, CO	Pass	State
2026-04-20	WES DJ GATHERING - FREDERICK CS — high-priority violation on file	DACONO AREA, Weld, CO	Pass	State
2026-04-20	DCP OPERATING CO - ENTERPRISE C.S. — high-priority violation on file	KEENESBURG 5.2 MI. N OF, Weld, CO	Fail	State
2026-04-16	LARAMIE ENERGY - MVS COMPRESSOR STATION	COLLBRAN 10.8 MI. E OF, Mesa, CO	Pass	State
2026-04-16	GCC RIO GRANDE - PUEBLO CEMENT PLANT — high-priority violation on file	PUEBLO 4.5 MI. S OF, Pueblo, CO	Pass	State
2026-04-15	LARAMIE ENERGY - MVS COMPRESSOR STATION	COLLBRAN 10.8 MI. E OF, Mesa, CO	Pass	State
2026-04-14	CEMEX CONSTRUCTION MATERIALS - LYONS — high-priority violation on file	LYONS AREA, Boulder, CO	Pass	State
2026-04-14	LARAMIE ENERGY - MVS COMPRESSOR STATION	COLLBRAN 10.8 MI. E OF, Mesa, CO	Pass	State
2026-04-14	GCC RIO GRANDE - PUEBLO CEMENT PLANT — high-priority violation on file	PUEBLO 4.5 MI. S OF, Pueblo, CO	Pass	State
2026-04-14	BLACK HILLS ELECTRIC GENERATION - PAGS	PUEBLO, Pueblo, CO	Pass	State
2026-04-14	DCP OPERATING CO - NORTHSTAR C.S.	EATON 3.4 MI. N OF, Weld, CO	Pass	State
2026-04-14	DCP OPERATING CO - NORTHSTAR C.S.	EATON 3.4 MI. N OF, Weld, CO	Pass	State
2026-04-13	CEMEX CONSTRUCTION MATERIALS - LYONS — high-priority violation on file	LYONS AREA, Boulder, CO	Pass	State
2026-04-13	CEMEX CONSTRUCTION MATERIALS - LYONS — high-priority violation on file	LYONS AREA, Boulder, CO	Pass	State
2026-04-10	DCP OPERATING CO - ENTERPRISE C.S. — high-priority violation on file	KEENESBURG 5.2 MI. N OF, Weld, CO	Pass	State
2026-04-10	DCP OPERATING CO - ENTERPRISE C.S. — high-priority violation on file	KEENESBURG 5.2 MI. N OF, Weld, CO	Pass	State
2026-04-09	CEMEX CONSTRUCTION MATERIALS - LYONS — high-priority violation on file	LYONS AREA, Boulder, CO	Pass	State
2026-04-09	CEMEX CONSTRUCTION MATERIALS - LYONS — high-priority violation on file	LYONS AREA, Boulder, CO	Pass	State
2026-04-09	WES DJ FT LUPTON/PLATTE VALLEY/LANCASTER — high-priority violation on file	FORT LUPTON, Weld, CO	Pass	State
2026-04-09	WES DJ FT LUPTON/PLATTE VALLEY/LANCASTER — high-priority violation on file	FORT LUPTON, Weld, CO	Pass	State
2026-04-09	NOBLE ENERGY - Y11 WASTE MANAGEMENT ECON	KEENESBURG, Weld, CO	Pass	State
2026-04-08	LARAMIE ENERGY - NICHOLS 24-06A PAD	COLLBRAN 6.6 MI. N OF, Mesa, CO	Pass	State
2026-04-08	CF & I STEEL L.P. DBA EVRAZ ROCKY MTN ST — high-priority violation on file	PUEBLO AREA, Pueblo, CO	Pass	State
2026-04-08	WES DJ FT LUPTON/PLATTE VALLEY/LANCASTER — high-priority violation on file	FORT LUPTON, Weld, CO	Pass	State
2026-04-08	DCP OPERATING CO - MEWBOURN — high-priority violation on file	GILCREST 2.4 MI. N OF, Weld, CO	Pass	State
2026-04-08	DCP OPERATING CO - MEWBOURN — high-priority violation on file	GILCREST 2.4 MI. N OF, Weld, CO	Pass	State
2026-04-08	WES DJ GATHERING - LATHAM GAS PLANT	GILCREST 2.4 MI. N OF, Weld, CO	Pass	State
2026-04-07	CEMEX CONSTRUCTION MATERIALS - LYONS — high-priority violation on file	LYONS AREA, Boulder, CO	Pass	State
2026-04-07	CF & I STEEL L.P. DBA EVRAZ ROCKY MTN ST — high-priority violation on file	PUEBLO AREA, Pueblo, CO	Pass	State
2026-04-07	LARAMIE ENERGY - BDU F01-199 PAD	RANGELY 15.8 MI. E OF, Rio Blanco, CO	Pass	State
2026-04-07	WES DJ FT LUPTON/PLATTE VALLEY/LANCASTER — high-priority violation on file	FORT LUPTON, Weld, CO	Pass	State
2026-04-07	DCP OPERATING CO - MEWBOURN — high-priority violation on file	GILCREST 2.4 MI. N OF, Weld, CO	Pass	State
2026-04-07	DCP OPERATING CO - MEWBOURN — high-priority violation on file	GILCREST 2.4 MI. N OF, Weld, CO	Pass	State
2026-04-07	EXTRACTION - TRIPLE CREEK PRODUCTION	GREELEY, Weld, CO	Pass	State
2026-04-06	CRESTONE PEAK - KING 3-65 28-29	AURORA, Adams, CO	Pass	State
2026-04-06	CRESTONE PEAK - KING 3-65 28-29	AURORA, Adams, CO	Pass	State
2026-04-06	CRESTONE PEAK - KING 3-65 28-29	AURORA, Adams, CO	Pass	State
2026-04-06	CRESTONE PEAK - KING 3-65 28-29	AURORA, Adams, CO	Pass	State
2026-04-06	WES DJ FT LUPTON/PLATTE VALLEY/LANCASTER — high-priority violation on file	FORT LUPTON, Weld, CO	Pass	State
2026-04-03	WES DJ FT LUPTON/PLATTE VALLEY/LANCASTER — high-priority violation on file	FORT LUPTON, Weld, CO	Pass	State
2026-03-31	TRANSCOLORADO GAS - OLATHE C.S.	OLATHE 6.4 MI. SW OF, Montrose, CO	N/A	State
2026-03-31	TRANSCOLORADO GAS - OLATHE C.S.	OLATHE 6.4 MI. SW OF, Montrose, CO	Pass	State
2026-03-31	PUBLIC SERVICE CO - PAWNEE PLT — high-priority violation on file	BRUSH 2.6 MI. N OF, Morgan, CO	Pass	State
2026-03-26	AMRIZE PORTLAND PLANT — high-priority violation on file	FLORENCE 3.8 MI. E OF, Fremont, CO	Pass	State
2026-03-26	LEPRINO FOODS COMPANY - GREELEY PLANT	GREELEY, Weld, CO	N/A	State
2026-03-26	WES DJ FT LUPTON/PLATTE VALLEY/LANCASTER — high-priority violation on file	FORT LUPTON, Weld, CO	Pass	State
2026-03-25	EXTRACTION- MILKSHAKE 31-W / PAVISTMA-N	WINDSOR AREA, Weld, CO	Pass	State
2026-03-24	EXTRACTION - ICE MAN PRODUCTION FACILITY	SEVERANCE AREA, Weld, CO	Pass	State
2026-03-23	EXTRACTION OIL & GAS - FRYE NORTH	WINDSOR, Weld, CO	Pass	State
2026-03-23	EXTRACTION OIL & GAS - FRYE NORTH	WINDSOR, Weld, CO	Pass	State
2026-03-19	QB ENERGY OPERATING - MESA E1-797 PF	PARACHUTE 5.7 MI. N OF, Garfield, CO	N/A	State
2026-03-19	QB ENERGY OPERATING - F21OU PF	DEBEQUE 5.0 MI. E OF, Mesa, CO	N/A	State
2026-03-18	QB ENERGY - E28OU SWD FACILITY	DE BEQUE 2.7 MI. N OF, Garfield, CO	N/A	State
2026-03-18	COVALENCE DJ, LLC - BIGFOOT 11	KERSEY AREA, Weld, CO	Fail	State
2026-03-17	ALLIED WASTE SYSTEMS-FOOTHILLS LANDFILL	ARVADA AREA, Jefferson, CO	Pass	State
2026-03-17	QB ENERGY OPERATING - C17OU SWD	DEBEQUE 4.2 MI. E OF, Mesa, CO	N/A	State
2026-03-17	WES DJ FT LUPTON/PLATTE VALLEY/LANCASTER — high-priority violation on file	FORT LUPTON, Weld, CO	Pass	State
2026-03-17	EXTRACTION - ARDREY PRODUCTION FACILITY	EVANS AREA, Weld, CO	Pass	State
2026-03-17	EXTRACTION - ARDREY PRODUCTION FACILITY	EVANS AREA, Weld, CO	Pass	State
2026-03-16	WES DJ FT LUPTON/PLATTE VALLEY/LANCASTER — high-priority violation on file	FORT LUPTON, Weld, CO	N/A	State
2026-03-11	ROCKY MOUNTAIN MIDSTREAM - AUBURN CS	KERSEY AREA, Weld, CO	Pass	State
2026-03-11	ROCKY MOUNTAIN MIDSTREAM - AUBURN CS	KERSEY AREA, Weld, CO	Pass	State
2026-03-11	ROCKY MOUNTAIN MIDSTREAM - AUBURN CS	KERSEY AREA, Weld, CO	Pass	State
2026-03-10	BARGATH - RYAN GULCH COMPRESSOR STATION — high-priority violation on file	MEEKER 23.2 MI. W OF, Rio Blanco, CO	Pending	State
2026-03-10	ROCKY MOUNTAIN MIDSTREAM - AUBURN CS	KERSEY AREA, Weld, CO	Pass	State
2026-03-10	ROCKY MOUNTAIN MIDSTREAM - AUBURN CS	KERSEY AREA, Weld, CO	Pass	State
2026-03-09	ROCKY MOUNTAIN MIDSTREAM - AUBURN CS	KERSEY AREA, Weld, CO	Pass	State
2026-03-03	BALL METAL BEVERAGE CONTAINER CORP	GOLDEN AREA, Jefferson, CO	Pass	State
2026-02-23	WES WATTENBURG - CENTRAL OIL STABIL	HUDSON 6.1 MI. N OF, Weld, CO	Pass	State
2026-02-19	PDC ENERGY, INC. - GOLDEN EAGLE HZ	SEVERANCE AREA, Weld, CO	N/A	State
2026-02-18	DCP OPERATING CO - LUCERNE 2 GAS PLANT — high-priority violation on file	GREELEY AREA, Weld, CO	Fail	State
2026-02-18	DCP OPERATING CO - LUCERNE 2 GAS PLANT — high-priority violation on file	GREELEY AREA, Weld, CO	Fail	State
2026-02-12	COORSTEK INC - CLEAR CREEK VALLEY PLANT — high-priority violation on file	GOLDEN AREA, Jefferson, CO	Fail	State
2026-02-12	MONTEZUMA COUNTY LANDFILL	CORTEZ 2.3 MI. S OF, Montezuma, CO	Pass	State
2026-02-11	COORSTEK INC - CLEAR CREEK VALLEY PLANT — high-priority violation on file	GOLDEN AREA, Jefferson, CO	Fail	State
2026-02-10	COORSTEK INC - CLEAR CREEK VALLEY PLANT — high-priority violation on file	GOLDEN AREA, Jefferson, CO	Fail	State
2026-02-05	WES DJ GAS PROC - WATTENBERG PLANT	AURORA, Adams, CO	Pass	State
2026-01-28	DCP OPERATING CO - LUCERNE 2 GAS PLANT — high-priority violation on file	GREELEY AREA, Weld, CO	N/A	State
2026-01-23	CS WIND AMERICA, INC — high-priority violation on file	PUEBLO, Pueblo, CO	Fail	State
2026-01-22	PDC ENERGY - KODAK NORTH PAD 2&3	WINDSOR AREA, Weld, CO	Pass	State
2026-01-20	PDC ENERGY, INC. - GOLDEN EAGLE HZ	SEVERANCE AREA, Weld, CO	N/A	State
2026-01-07	CRESTONE PEAK - ESTRN HILLS 4-65 17-18 S	AURORA, Arapahoe, CO	Pass	State
2026-01-07	CRESTONE PEAK - ESTRN HILLS 4-65 17-18 S	AURORA, Arapahoe, CO	Pass	State
2026-01-07	NOBLE ENERGY - NCLP AA06, AA07 MAHALO ST — high-priority violation on file	KERSEY 9.8 MI. NE OF, Weld, CO	Pass	State

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