EPA Air · stack tests by year
Air-emissions stack tests in 2026
- 11,110Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
States, 2026
- Ohio 1,474
- Indiana 1,010
- California 979
- Florida 795
- Wyoming 755
- New Mexico 724
- Georgia 509
- Pennsylvania 501
- Arkansas 374
- Alabama 357
- Missouri 326
- Texas 316
- Mississippi 263
- Michigan 207
- North Carolina 188
- Colorado 185
- Iowa 167
- Illinois 165
- South Carolina 135
- Wisconsin 135
- West Virginia 114
- Virginia 98
- Idaho 96
- Montana 91
- Tennessee 84
- Minnesota 84
- Delaware 73
- Kentucky 71
- Arizona 71
- Connecticut 68
- Kansas 63
- Nevada 57
- Massachusetts 54
- North Dakota 52
- Nebraska 51
- Utah 51
- Washington 46
- Alaska 45
- New York 43
- South Dakota 34
- District of Columbia 30
- New Hampshire 29
- Maryland 28
- Oregon 27
- Louisiana 26
- Hawaii 21
- Oklahoma 15
- Rhode Island 13
- Puerto Rico 5
- Maine 5
Other years
Air-emissions stack tests recorded in 2026
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2026-04-07 | ENABLE MRT, LLC - GLENDALE COMPRESSOR STATION | STAR CITY, Lincoln, AR | Pass | State |
| 2026-04-07 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | CARSON, Los Angeles, CA | Pass | Local |
| 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 |
| 2026-04-07 | QUIKRETE CONSTRUCTION MATERIALS, LLC | NEWBERRY, Alachua, FL | Pass | State |
| 2026-04-07 | QUIKRETE CONSTRUCTION MATERIALS, LLC | NEWBERRY, Alachua, FL | Pass | State |
| 2026-04-07 | QUIKRETE CONSTRUCTION MATERIALS, LLC | NEWBERRY, Alachua, FL | Pass | State |
| 2026-04-07 | QUIKRETE CONSTRUCTION MATERIALS, LLC | NEWBERRY, Alachua, FL | Pass | State |
| 2026-04-07 | MIAMI-DADE WATER AND SEWER DEPARTMENT | MIAMI, Miami-Dade, FL | Pass | State |
| 2026-04-07 | MIAMI-DADE WATER AND SEWER DEPARTMENT | MIAMI, Miami-Dade, FL | Pass | State |
| 2026-04-07 | MIAMI-DADE WATER AND SEWER DEPARTMENT | MIAMI, Miami-Dade, FL | Pass | State |
| 2026-04-07 | MIAMI-DADE WATER AND SEWER DEPARTMENT | MIAMI, Miami-Dade, FL | Pass | State |
| 2026-04-07 | MIAMI-DADE WATER AND SEWER DEPARTMENT | MIAMI, Miami-Dade, FL | Pass | State |
| 2026-04-07 | MIAMI-DADE WATER AND SEWER DEPARTMENT | MIAMI, Miami-Dade, FL | Pass | State |
| 2026-04-07 | MIAMI-DADE WATER AND SEWER DEPARTMENT | MIAMI, Miami-Dade, FL | Pass | State |
| 2026-04-07 | MIAMI-DADE WATER AND SEWER DEPARTMENT | MIAMI, Miami-Dade, FL | Pass | State |
| 2026-04-07 | MIAMI-DADE WATER AND SEWER DEPARTMENT | MIAMI, Miami-Dade, FL | Pass | State |
| 2026-04-07 | WESTROCK CP, LLC | FERNANDINA BEACH, Nassau, FL | Pass | State |
| 2026-04-07 | WESTROCK CP, LLC | FERNANDINA BEACH, Nassau, FL | Pass | State |
| 2026-04-07 | WESTROCK CP, LLC | FERNANDINA BEACH, Nassau, FL | Pass | State |
| 2026-04-07 | WESTROCK CP, LLC | FERNANDINA BEACH, Nassau, FL | Pass | State |
| 2026-04-07 | GRAPHIC PACKAGING INTERNATIONAL, LLC - MACON MILL | MACON, Bibb, GA | Pass | State |
| 2026-04-07 | GRAPHIC PACKAGING INTERNATIONAL, LLC - MACON MILL | MACON, Bibb, GA | Pass | State |
| 2026-04-07 | GRAPHIC PACKAGING INTERNATIONAL, LLC - MACON MILL | MACON, Bibb, GA | Pass | State |
| 2026-04-07 | GRAPHIC PACKAGING INTERNATIONAL, LLC - MACON MILL | MACON, Bibb, GA | Pass | State |
| 2026-04-07 | SULFCO, LLC | SAVANNAH, Chatham, GA | Pass | State |
| 2026-04-07 | FLOWERS BAKING COMPANY OF TUCKER, LLC | TUCKER, DeKalb, GA | Pass | State |
| 2026-04-07 | INTERNATIONAL PAPER COMPANY - ROME MILL | ROME, Floyd, GA | Pass | State |
| 2026-04-07 | INTERNATIONAL PAPER COMPANY - ROME MILL | ROME, Floyd, GA | Pass | State |
| 2026-04-07 | MAS ASB COGEN LLC CHP FACILITY | ATLANTA, Fulton, GA | Pass | State |
| 2026-04-07 | MAS ASB COGEN LLC CHP FACILITY | ATLANTA, Fulton, GA | Pass | State |
| 2026-04-07 | MAS ASB COGEN LLC CHP FACILITY | ATLANTA, Fulton, GA | Pass | State |
| 2026-04-07 | HOMELAND ENERGY SOLUTIONS LLC — high-priority violation on file | LAWLER, Chickasaw, IA | Pass | State |
| 2026-04-07 | HOMELAND ENERGY SOLUTIONS LLC — high-priority violation on file | LAWLER, Chickasaw, IA | Pass | State |
| 2026-04-07 | HOMELAND ENERGY SOLUTIONS LLC — high-priority violation on file | LAWLER, Chickasaw, IA | Pass | State |
| 2026-04-07 | HOMELAND ENERGY SOLUTIONS LLC — high-priority violation on file | LAWLER, Chickasaw, IA | Pass | State |
| 2026-04-07 | HYCAST FOUNDRY — high-priority violation on file | FAIRFIELD, Jefferson, IA | Fail | State |
| 2026-04-07 | SIBLEY MUNICIPAL UTILITIES | SIBLEY, Osceola, IA | Pass | State |
| 2026-04-07 | J R SIMPLOT COMPANY-DON SIDING POCATELLO — high-priority violation on file | POCATELLO, Power, ID | Pass | State |
| 2026-04-07 | CLEVELAND-CLIFFS STEEL LLC — high-priority violation on file | EAST CHICAGO, Lake, IN | Pass | State |
| 2026-04-07 | CLEVELAND-CLIFFS STEEL LLC — high-priority violation on file | EAST CHICAGO, Lake, IN | Pass | State |
| 2026-04-07 | CLEVELAND-CLIFFS STEEL LLC — high-priority violation on file | EAST CHICAGO, Lake, IN | Pass | State |
| 2026-04-07 | NUCOR STEEL — high-priority violation on file | CRAWFORDSVILLE, Montgomery, IN | Pass | State |
| 2026-04-07 | NUCOR STEEL — high-priority violation on file | CRAWFORDSVILLE, Montgomery, IN | Pass | State |
| 2026-04-07 | NUCOR STEEL — high-priority violation on file | CRAWFORDSVILLE, Montgomery, IN | Pass | State |
| 2026-04-07 | NUCOR STEEL — high-priority violation on file | CRAWFORDSVILLE, Montgomery, IN | Pass | State |
| 2026-04-07 | PRIMARY PRODUCTS INGREDIENTS AMERICAS, LLC | LAFAYETTE, Tippecanoe, IN | Pass | State |
| 2026-04-07 | PRIMARY PRODUCTS INGREDIENTS AMERICAS, LLC | LAFAYETTE, Tippecanoe, IN | Pass | State |
| 2026-04-07 | PRIMARY PRODUCTS INGREDIENTS AMERICAS, LLC | LAFAYETTE, Tippecanoe, IN | Pass | State |
| 2026-04-07 | PRIMARY PRODUCTS INGREDIENTS AMERICAS, LLC | LAFAYETTE, Tippecanoe, IN | Pass | State |
| 2026-04-07 | ALCOA POWER GENERATING INC WARRICK POWER PLANT — high-priority violation on file | NEWBURGH, Warrick, IN | Pass | State |
| 2026-04-07 | WESTLAKE VINYLS INC | CALVERT CITY, Marshall, KY | Fail | State |
| 2026-04-07 | SUPERIOR BATTERY MFG CO | RUSSELL SPRINGS, Russell, KY | Pass | State |
| 2026-04-07 | SUGARBERRY SOUTH FACILITY | BUTTE LAROSE, St. Martin, LA | Pass | State |
| 2026-04-07 | STONY BROOK ENERGY CENTER — high-priority violation on file | LUDLOW, TOWN OF, Hampden, MA | Pending | State |
| 2026-04-07 | MEDICAL AREA TOTAL ENERGY | BOSTON, CITY OF, Suffolk, MA | Pending | State |
| 2026-04-07 | ST. MARYS CEMENT | DETROIT, Wayne, MI | Pass | State |
| 2026-04-07 | BILLERUD QUINNESEC LLC | QUINNESEC, Dickinson, MI | Pass | State |
| 2026-04-07 | ANHEUSER BUSCH, LLC, ST.LOUIS BREWERY | SAINT LOUIS, St. Louis (city), MO | Pass | State |
| 2026-04-07 | GREENVILLE WATER TREATMENT PLANT | GREENVILLE, Pitt, NC | Pass | State |
| 2026-04-07 | ROUGH RIDER BAKKEN G&P LLC, A SUBSIDIARY OF ENERGY TRANSFER, LP - WILD BASIN GAS | WATFORD CITY, McKenzie, ND | N/A | State |
| 2026-04-07 | ROUGH RIDER BAKKEN G&P LLC, A SUBSIDIARY OF ENERGY TRANSFER, LP - WILD BASIN GAS | WATFORD CITY, McKenzie, ND | N/A | State |
| 2026-04-07 | ROUGH RIDER BAKKEN G&P LLC, A SUBSIDIARY OF ENERGY TRANSFER, LP - WILD BASIN GAS | WATFORD CITY, McKenzie, ND | N/A | State |
| 2026-04-07 | HILAND PARTNERS HOLDINGS LLC - EDGEWATER COMPRESSOR STATION | WILLISTON, Mountrail, ND | Pass | State |
| 2026-04-07 | HUMIDOR COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-04-07 | JANIE CONNER FACILITY — high-priority violation on file | MALAGA, Eddy, NM | Pass | State |
| 2026-04-07 | NORTH PEN COMPRESSOR STATION | ARTESIA, Eddy, NM | Pass | State |
| 2026-04-07 | NORTH PEN COMPRESSOR STATION | ARTESIA, Eddy, NM | Pass | State |
| 2026-04-07 | GENERAL KEHOE FACILITY | MALAGA, Eddy, NM | Pass | State |
| 2026-04-07 | TANTO COMPRESSOR STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2026-04-07 | TANTO COMPRESSOR STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2026-04-07 | FRAC CAT COMPRESSOR STATION | LOVING, Lea, NM | Pass | State |
| 2026-04-07 | ABU COMPRESSOR STATION — high-priority violation on file | JAL, Lea, NM | Pass | State |
| 2026-04-07 | ABU COMPRESSOR STATION — high-priority violation on file | JAL, Lea, NM | Pass | State |
| 2026-04-07 | LEA COMPRESSOR STATION | MONUMENT, Lea, NM | Pass | State |
| 2026-04-07 | ANDERSON FED COM PAD B BATTERY | MONUMENT, Lea, NM | Pass | State |
| 2026-04-07 | PAUL FLOWERS TB | MONUMENT, Lea, NM | Pass | State |
| 2026-04-07 | CLEVELAND STEEL CONTAINER CORPORATION | YOUNGSTOWN, Mahoning, OH | Pass | State |
| 2026-04-07 | DTE ST. BERNARD, LLC | CINCINNATI, Hamilton, OH | Pass | State |
| 2026-04-07 | DTE ST. BERNARD, LLC | CINCINNATI, Hamilton, OH | Pass | State |
| 2026-04-07 | TENNESSEE GAS PIPELINE CO LLC/COMP STA 321 | CLIFFORD, Susquehanna, PA | Pass | State |
| 2026-04-07 | SVC MFG INC/MOUNTAIN TOP | MOUNTAIN TOP, Luzerne, PA | Pass | State |
| 2026-04-07 | LEADING TECH/LEECHBURG | LEECHBURG, Armstrong, PA | Pass | State |
| 2026-04-07 | WPX ENERGY APPALACHIA LLC/POWERS SITE | MONTROSE, Susquehanna, PA | Pass | State |
| 2026-04-07 | NFG MIDSTREAM COVINGTON LLC/CLARK COMP STA | MAINESBURG, Tioga, PA | Pass | State |
| 2026-04-07 | PALMETTO CORP - GREER PLANT | GREER, Greenville, SC | Pass | State |
| 2026-04-07 | KINDER MORGAN LLC - MAIN GAS PLANT | ALTAMONT, Duchesne, UT | Pass | State |
| 2026-04-07 | KINDER MORGAN LLC - MAIN GAS PLANT | ALTAMONT, Duchesne, UT | Pass | State |
| 2026-04-07 | AMERICAN ELECTRIC POWER-CLINCH RIVER PLANT | CLEVELAND, Russell, VA | Pass | State |
| 2026-04-07 | ALLIANT ENERGY - WPL - COLUMBIA ENERGY CENTER | PARDEEVILLE, Columbia, WI | Pass | State |
| 2026-04-07 | WI DOA / UW-MADISON WALNUT ST PLT | MADISON, Dane, WI | Pass | State |
| 2026-04-07 | SUPERIOR REFINING COMPANY LLC — high-priority violation on file | SUPERIOR, Douglas, WI | Pass | State |
| 2026-04-07 | XCEL ENERGY - FRENCH ISLAND GENERATING PLANT | LA CROSSE, La Crosse, WI | Pass | State |
| 2026-04-07 | AHLSTROM MOSINEE, LLC — high-priority violation on file | MOSINEE, Marathon, WI | Pass | State |
| 2026-04-07 | EASTERN GAS TRANSMISSION AND STORAGE, INC., SARDIS STATION | SARDIS, Harrison, WV | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.