EPA Air · stack tests by year
Air-emissions stack tests in 2025
- 26,291Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
States, 2025
- California 5,390
- Ohio 2,213
- New Mexico 1,801
- Indiana 1,619
- Florida 1,419
- Wyoming 1,362
- Georgia 1,233
- Oklahoma 1,229
- Pennsylvania 951
- Missouri 768
- Alabama 693
- Mississippi 688
- Arkansas 619
- Iowa 500
- Colorado 405
- Michigan 387
- Texas 308
- North Carolina 275
- Illinois 264
- Washington 251
- Wisconsin 245
- Minnesota 238
- West Virginia 224
- Delaware 212
- South Carolina 210
- Kentucky 204
- Kansas 202
- Connecticut 178
- Utah 175
- Montana 174
- Virginia 170
- Tennessee 168
- Alaska 152
- Nebraska 145
- North Dakota 143
- Maine 131
- New York 124
- Louisiana 117
- Arizona 116
- Idaho 111
- Nevada 73
- New Hampshire 59
- Massachusetts 59
- Oregon 56
- Hawaii 53
- Maryland 51
- South Dakota 46
- Rhode Island 30
- District of Columbia 28
- Puerto Rico 14
- Vermont 4
- New Jersey 4
Other years
Air-emissions stack tests recorded in 2025
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2025-09-16 | CRODA, INC — high-priority violation on file | NEW CASTLE, New Castle, DE | Pass | State |
| 2025-09-16 | CRODA, INC — high-priority violation on file | NEW CASTLE, New Castle, DE | Pass | State |
| 2025-09-16 | CRODA, INC — high-priority violation on file | NEW CASTLE, New Castle, DE | Pass | State |
| 2025-09-16 | CITY OF GAINESVILLE, GRU — high-priority violation on file | GAINESVILLE, Alachua, FL | Pass | State |
| 2025-09-16 | CITY OF GAINESVILLE, GRU — high-priority violation on file | GAINESVILLE, Alachua, FL | Pass | State |
| 2025-09-16 | CEMEX CONSTRUCTION MATERIALS FLORIDA,LLC | BROOKSVILLE, Hernando, FL | Pass | State |
| 2025-09-16 | FLORIDA POWER & LIGHT (PMR) | INDIANTOWN, Martin, FL | Pass | State |
| 2025-09-16 | LAKELAND ELECTRIC | LAKELAND, Polk, FL | Pass | State |
| 2025-09-16 | LAKELAND ELECTRIC | LAKELAND, Polk, FL | Pass | State |
| 2025-09-16 | DUKE ENERGY FLORIDA, LLC | LIVE OAK, Suwannee, FL | Pass | State |
| 2025-09-16 | DUKE ENERGY FLORIDA, LLC | LIVE OAK, Suwannee, FL | Pass | State |
| 2025-09-16 | DUKE ENERGY FLORIDA, LLC | LIVE OAK, Suwannee, FL | Pass | State |
| 2025-09-16 | DUKE ENERGY FLORIDA, LLC | LIVE OAK, Suwannee, FL | Pass | State |
| 2025-09-16 | INTERNATIONAL PAPER COMPANY - PORT WENTWORTH MILL | PORT WENTWORTH, Chatham, GA | Pass | State |
| 2025-09-16 | INTERNATIONAL PAPER COMPANY - PORT WENTWORTH MILL | PORT WENTWORTH, Chatham, GA | Pass | State |
| 2025-09-16 | OGLETHORPE POWER CORPORATION - BACONTON ENERGY FACILITY | BACONTON, Mitchell, GA | Pass | State |
| 2025-09-16 | BWAY CORP | CHICAGO, Cook, IL | Pass | State |
| 2025-09-16 | DYNEGY MIDWEST GENERATION LLC | BALDWIN, Randolph, IL | Pass | State |
| 2025-09-16 | DYNEGY MIDWEST GENERATION LLC | BALDWIN, Randolph, IL | Pass | State |
| 2025-09-16 | DYNEGY MIDWEST GENERATION LLC | BALDWIN, Randolph, IL | Pass | State |
| 2025-09-16 | STEEL DYNAMICS, INC. FLAT ROLL GROUP, BUTLER DIVISION — high-priority violation on file | BUTLER, DeKalb, IN | Pass | State |
| 2025-09-16 | STEEL DYNAMICS, INC. FLAT ROLL GROUP, BUTLER DIVISION — high-priority violation on file | BUTLER, DeKalb, IN | Pass | State |
| 2025-09-16 | STEEL DYNAMICS, INC. FLAT ROLL GROUP, BUTLER DIVISION — high-priority violation on file | BUTLER, DeKalb, IN | Pass | State |
| 2025-09-16 | STEEL DYNAMICS, INC. FLAT ROLL GROUP, BUTLER DIVISION — high-priority violation on file | BUTLER, DeKalb, IN | Pass | State |
| 2025-09-16 | STEEL DYNAMICS, INC. FLAT ROLL GROUP, BUTLER DIVISION — high-priority violation on file | BUTLER, DeKalb, IN | Pass | State |
| 2025-09-16 | STEEL DYNAMICS, INC. FLAT ROLL GROUP, BUTLER DIVISION — high-priority violation on file | BUTLER, DeKalb, IN | Pass | State |
| 2025-09-16 | STEEL DYNAMICS, INC. FLAT ROLL GROUP, BUTLER DIVISION — high-priority violation on file | BUTLER, DeKalb, IN | Pass | State |
| 2025-09-16 | STEEL DYNAMICS, INC. FLAT ROLL GROUP, BUTLER DIVISION — high-priority violation on file | BUTLER, DeKalb, IN | Pass | State |
| 2025-09-16 | STEEL DYNAMICS, INC. FLAT ROLL GROUP, BUTLER DIVISION — high-priority violation on file | BUTLER, DeKalb, IN | Pass | State |
| 2025-09-16 | NATIONAL MATERIAL PROCESSING | EAST CHICAGO, Lake, IN | Pass | State |
| 2025-09-16 | WM TECHNOLOGIES LLC — high-priority violation on file | MICHIGAN CITY, LaPorte, IN | Pass | State |
| 2025-09-16 | WM TECHNOLOGIES LLC — high-priority violation on file | MICHIGAN CITY, LaPorte, IN | Pass | State |
| 2025-09-16 | WM TECHNOLOGIES LLC — high-priority violation on file | MICHIGAN CITY, LaPorte, IN | Pass | State |
| 2025-09-16 | VALERO RENEWABLE FUELS COMPANY DBA VALERO LINDEN PLANT | LINDEN, Montgomery, IN | Pass | State |
| 2025-09-16 | VALERO RENEWABLE FUELS COMPANY DBA VALERO LINDEN PLANT | LINDEN, Montgomery, IN | Pass | State |
| 2025-09-16 | VALERO RENEWABLE FUELS COMPANY DBA VALERO LINDEN PLANT | LINDEN, Montgomery, IN | Pass | State |
| 2025-09-16 | VALERO RENEWABLE FUELS COMPANY DBA VALERO LINDEN PLANT | LINDEN, Montgomery, IN | Pass | State |
| 2025-09-16 | VALERO RENEWABLE FUELS COMPANY DBA VALERO LINDEN PLANT | LINDEN, Montgomery, IN | Pass | State |
| 2025-09-16 | VALERO RENEWABLE FUELS COMPANY DBA VALERO LINDEN PLANT | LINDEN, Montgomery, IN | Pass | State |
| 2025-09-16 | CHANUTE MUN. POWER PLANT #2 (AIR) | CHANUTE, Neosho, KS | Pass | State |
| 2025-09-16 | NORTH AMERICAN STAINLESS | GHENT, Carroll, KY | Pass | State |
| 2025-09-16 | ANR PIPELINE CO (MADISONVILLE COMPRESSOR STA) | MADISONVILLE, Hopkins, KY | Pass | State |
| 2025-09-16 | LOGAN ALUMINUM INC | RUSSELLVILLE, Logan, KY | Pass | State |
| 2025-09-16 | LOGAN ALUMINUM INC | RUSSELLVILLE, Logan, KY | Pass | State |
| 2025-09-16 | TENNESSEE VALLEY AUTHORITY (TVA) - SHAWNEE FOSSIL PLANT | WEST PADUCAH, McCracken, KY | Pass | State |
| 2025-09-16 | BUCKEYE TERMINALS LLC | LOUISVILLE, Jefferson, KY | Pass | Local |
| 2025-09-16 | LOUISIANA ENERGY GATEWAY LLC - TEXANA COMPRESSOR STATION | KEATCHIE, De Soto, LA | Pass | State |
| 2025-09-16 | WASTE MANAGEMENT DISPOSAL SERVICES OF MAINE, INC. — high-priority violation on file | NORRIDGEWOCK, Somerset, ME | Pass | State |
| 2025-09-16 | WASTE MANAGEMENT DISPOSAL SERVICES OF MAINE, INC. — high-priority violation on file | NORRIDGEWOCK, Somerset, ME | Pass | State |
| 2025-09-16 | CUMMINS POWER GENERATION INC | FRIDLEY, Anoka, MN | Pass | State |
| 2025-09-16 | AG PROCESSING INC - DAWSON | DAWSON, Lac qui Parle, MN | Pass | State |
| 2025-09-16 | SAINT JAMES DIESEL GENERATING PLANT | SAINT JAMES, Watonwan, MN | Pass | State |
| 2025-09-16 | RAY-CARROLL COUNTY GRAIN GROWERS INC. | BRUNSWICK, Chariton, MO | Pass | State |
| 2025-09-16 | RAY-CARROLL COUNTY GRAIN GROWERS INC. | BRUNSWICK, Chariton, MO | Pass | State |
| 2025-09-16 | RAY-CARROLL COUNTY GRAIN GROWERS INC. | BRUNSWICK, Chariton, MO | Pass | State |
| 2025-09-16 | RAY-CARROLL COUNTY GRAIN GROWERS INC. | BRUNSWICK, Chariton, MO | Pass | State |
| 2025-09-16 | RAY-CARROLL GRAIN GROWERS CORDER | CORDER, Lafayette, MO | Pass | State |
| 2025-09-16 | RAY-CARROLL GRAIN GROWERS CORDER | CORDER, Lafayette, MO | Pass | State |
| 2025-09-16 | RAY-CARROLL GRAIN GROWERS CORDER | CORDER, Lafayette, MO | Pass | State |
| 2025-09-16 | KAAPA ETHANOL RAVENNA LLC — high-priority violation on file | RAVENNA, Buffalo, NE | Pass | State |
| 2025-09-16 | KAAPA ETHANOL LLC | MINDEN, Kearney, NE | N/A | State |
| 2025-09-16 | COTTON DRAW UNIT 26 CTB 2 | MALAGA, Eddy, NM | Pass | State |
| 2025-09-16 | BOWERS ASPHALT & PAVING, INC — high-priority violation on file | WALBRIDGE, Wood, OH | Pass | State |
| 2025-09-16 | ASCENT RESOURCES - UTICA LLC - HOWELL 33 SMF JF | DILLONVALE, Jefferson, OH | Pass | State |
| 2025-09-16 | ASCENT RESOURCES - UTICA LLC - HOWELL 33 SMF JF | DILLONVALE, Jefferson, OH | Pass | State |
| 2025-09-16 | ASCENT RESOURCES - UTICA LLC - HOWELL 33 SMF JF | DILLONVALE, Jefferson, OH | Pass | State |
| 2025-09-16 | TARGA PIPELINE MIDCONTINENT LLC / MATHEWS COMPRESSOR STATION | WILSON, Carter, OK | Pass | State |
| 2025-09-16 | BCE MACH III LLC / BOLLENBACH 1705 6 30MH SHACKELFORD 170 | KINGFISHER, Kingfisher, OK | Pass | State |
| 2025-09-16 | BCE MACH III LLC / BOLLENBACH 1705 6 30MH SHACKELFORD 170 | KINGFISHER, Kingfisher, OK | Pass | State |
| 2025-09-16 | BCE MACH III LLC / LSEOU 92 3HO LSEOU 93 6HO LSEOU 93 8HO | KINGFISHER, Kingfisher, OK | Pass | State |
| 2025-09-16 | GEORGIA-PACIFIC WAUNA LLC — high-priority violation on file | CLATSKANIE, Clatsop, OR | Pass | State |
| 2025-09-16 | ADHESIVES RESEARCH INC/GLEN ROCK — high-priority violation on file | GLEN ROCK, York, PA | Pass | State |
| 2025-09-16 | PEOPLES NATURAL GAS CO LLC/LIMESTONE COMP STA | SUMMERVILLE, Clarion, PA | Pass | State |
| 2025-09-16 | PA GEN ENERGY CO LLC/POTATO CREEK 1H COMP STA | CROSBY, McKean, PA | Pass | State |
| 2025-09-16 | SUSQUEHANNA GATHERING CO 1 LLC/CDP 3 | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2025-09-16 | ETC NORTHEAST PIPELINE/GALAXY COMP STA | PARKER, Butler, PA | Pass | State |
| 2025-09-16 | 2G-SPE-1 LLC (MEDTRONIC PONCE) | PONCE COUNTY, Ponce, PR | Pass | U.S. EPA |
| 2025-09-16 | ASPEN AEROGELS, INC. — high-priority violation on file | EAST PROVIDENCE, Providence, RI | Pass | State |
| 2025-09-16 | SANTEE COOPER CROSS GENERATING STATION — high-priority violation on file | PINEVILLE, Berkeley, SC | Pass | State |
| 2025-09-16 | JW ALUMINUM COMPANY | GOOSE CREEK, Berkeley, SC | Pass | State |
| 2025-09-16 | WHARF RESOURCES INC - COEUR WHARF | LEAD, Lawrence, SD | Pass | State |
| 2025-09-16 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-09-16 | LANXESS CORPORATION — high-priority violation on file | KALAMA, Cowlitz, WA | Pass | Local |
| 2025-09-16 | TRANSALTA CENTRALIA GENERATION, LLC — high-priority violation on file | CENTRALIA, Lewis, WA | Pass | Local |
| 2025-09-16 | BISON TREATING FACILITY (CRESTONE POWDER RIVER, L.L.C.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-09-16 | BISON TREATING FACILITY (CRESTONE POWDER RIVER, L.L.C.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-09-16 | BISON TREATING FACILITY (CRESTONE POWDER RIVER, L.L.C.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-09-16 | BISON TREATING FACILITY (CRESTONE POWDER RIVER, L.L.C.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-09-16 | BISON TREATING FACILITY (CRESTONE POWDER RIVER, L.L.C.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-09-16 | BISON TREATING FACILITY (CRESTONE POWDER RIVER, L.L.C.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-09-16 | BISON TREATING FACILITY (CRESTONE POWDER RIVER, L.L.C.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-09-16 | BISON TREATING FACILITY (CRESTONE POWDER RIVER, L.L.C.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-09-16 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2025-09-16 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2025-09-15 | GAS PROCESSORS, INC. | BROOKLYN, Conecuh, AL | Pass | State |
| 2025-09-15 | GAS PROCESSORS, INC. | BROOKLYN, Conecuh, AL | Pass | State |
| 2025-09-15 | GAS PROCESSORS, INC. | BROOKLYN, Conecuh, AL | Pass | State |
| 2025-09-15 | GAS PROCESSORS, INC. | BROOKLYN, Conecuh, AL | Pass | State |
| 2025-09-15 | DESOTO GATHERING COMPANY, LLC - WEST CUTTHROAT CPF-1 | QUITMAN, Cleburne, AR | Pass | State |
| 2025-09-15 | DESOTO GATHERING COMPANY, LLC - SOUTH RAINBOW | CENTER RIDGE, Conway, AR | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.