EPA Air · stack tests by year
Air-emissions stack tests in 2026
- 15,218Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
States, 2026
- Ohio 1,887
- California 1,849
- Indiana 1,315
- New Mexico 1,112
- Florida 1,099
- Wyoming 903
- Georgia 693
- Pennsylvania 636
- Arkansas 481
- Alabama 445
- Missouri 433
- Texas 337
- Mississippi 332
- Michigan 270
- Colorado 255
- Iowa 250
- North Carolina 239
- Illinois 224
- Wisconsin 190
- South Carolina 165
- Kansas 151
- West Virginia 140
- Virginia 119
- Montana 115
- Idaho 114
- Utah 109
- Minnesota 108
- Delaware 107
- Tennessee 106
- Kentucky 97
- Connecticut 92
- Washington 87
- Arizona 83
- Massachusetts 78
- Nebraska 74
- North Dakota 72
- New York 67
- Nevada 61
- Alaska 47
- New Hampshire 38
- South Dakota 36
- Louisiana 35
- District of Columbia 30
- Maryland 29
- Oregon 28
- Hawaii 24
- Rhode Island 19
- Maine 16
- Oklahoma 15
- Puerto Rico 6
Other years
Air-emissions stack tests recorded in 2026
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2026-08-07 | APS WEST PHX POWER PLANT | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2026-08-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-07 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-07 | FLORIDA POWER & LIGHT COMPANY | PENSACOLA, Escambia, FL | Pass | State |
| 2026-08-07 | J SHAW INDUSTRIES LLC DBA KOKOMO OPALESCENT GLASS COMPANY | KOKOMO, Howard, IN | Pass | State |
| 2026-08-07 | J SHAW INDUSTRIES LLC DBA KOKOMO OPALESCENT GLASS COMPANY | KOKOMO, Howard, IN | Pass | State |
| 2026-08-07 | TOPPAN PACKAGING USA INC — high-priority violation on file | EDINBURGH, Johnson, IN | Pass | State |
| 2026-08-07 | AMAZON DATA SERVICES INCORPORATED — high-priority violation on file | NEW CARLISLE, St. Joseph, IN | Pass | State |
| 2026-08-07 | AMAZON DATA SERVICES INCORPORATED — high-priority violation on file | NEW CARLISLE, St. Joseph, IN | Pass | State |
| 2026-08-07 | AMAZON DATA SERVICES INCORPORATED — high-priority violation on file | NEW CARLISLE, St. Joseph, IN | Pass | State |
| 2026-08-07 | CONSUMERS ENERGY - RAY COMPRESSOR STATION | ARMADA, Macomb, MI | Pass | State |
| 2026-08-07 | CAPITAL QUARRIES CO INC - ROLLA HWY 63 QUARRY | ROLLA, Phelps, MO | Pass | State |
| 2026-08-07 | CAPITAL QUARRIES CO INC - ROLLA HWY 63 QUARRY | ROLLA, Phelps, MO | Pass | State |
| 2026-08-07 | CAPITAL QUARRIES CO INC - ROLLA HWY 63 QUARRY | ROLLA, Phelps, MO | Pass | State |
| 2026-08-07 | CAPITAL QUARRIES CO INC - ROLLA HWY 63 QUARRY | ROLLA, Phelps, MO | Pass | State |
| 2026-08-07 | CAPITAL QUARRIES CO INC - ROLLA HWY 63 QUARRY | ROLLA, Phelps, MO | Pass | State |
| 2026-08-07 | CAPITAL QUARRIES CO INC - ROLLA HWY 63 QUARRY | ROLLA, Phelps, MO | Pass | State |
| 2026-08-07 | CAPITAL QUARRIES CO INC - ROLLA HWY 63 QUARRY | ROLLA, Phelps, MO | Pass | State |
| 2026-08-07 | CAPITAL QUARRIES CO INC - ROLLA HWY 63 QUARRY | ROLLA, Phelps, MO | Pass | State |
| 2026-08-07 | CAPITAL QUARRIES CO INC - ROLLA HWY 63 QUARRY | ROLLA, Phelps, MO | Pass | State |
| 2026-08-07 | CAPITAL QUARRIES CO INC - ROLLA HWY 63 QUARRY | ROLLA, Phelps, MO | Pass | State |
| 2026-08-07 | CAPITAL QUARRIES CO INC - ROLLA HWY 63 QUARRY | ROLLA, Phelps, MO | Pass | State |
| 2026-08-07 | CAPITAL QUARRIES CO INC - ROLLA HWY 63 QUARRY | ROLLA, Phelps, MO | Pass | State |
| 2026-08-07 | CAPITAL QUARRIES CO INC - ROLLA HWY 63 QUARRY | ROLLA, Phelps, MO | Pass | State |
| 2026-08-07 | CAPITAL QUARRIES CO INC - ROLLA HWY 63 QUARRY | ROLLA, Phelps, MO | Pass | State |
| 2026-08-07 | CYPRESS 34 B CTB | MALAGA, Eddy, NM | Pass | State |
| 2026-08-07 | PLANTVIEW COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-08-07 | VANDELAY COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-08-07 | WALTER COMPRESSOR STATION | LOCO HILLS, Lea, NM | Pass | State |
| 2026-08-07 | EQM GATHERING OPCO LLC/CYGRYMUS COMP STA | NEW FREEPORT, Greene, PA | Pass | State |
| 2026-08-07 | NUCOR STEEL | PLYMOUTH, Box Elder, UT | Pass | State |
| 2026-08-07 | RACINE WASTEWATER TREATMENT FACILITY — high-priority violation on file | RACINE, Richland, WI | Pass | State |
| 2026-08-06 | SOUTHERN NATURAL GAS | AUBURN, Lee, AL | Pass | State |
| 2026-08-06 | SOUTHERN NATURAL GAS | AUBURN, Lee, AL | Pass | State |
| 2026-08-06 | CHEVRON USA PRODUCTS COMPANY | BIRMINGHAM, Jefferson, AL | Pass | Local |
| 2026-08-06 | MPLX TERMINALS LLC BIRMINGHAM TERMINAL | BIRMINGHAM, Jefferson, AL | Pass | Local |
| 2026-08-06 | LEHIGH CEMENT COMPANY | LEEDS, Jefferson, AL | Pending | Local |
| 2026-08-06 | LEHIGH CEMENT COMPANY | LEEDS, Jefferson, AL | Pass | Local |
| 2026-08-06 | DESOTO GATHERING COMPANY, LLC. - PUMA CPF-1 | HEBER SPRINGS, Cleburne, AR | Pass | State |
| 2026-08-06 | DESOTO GATHERING COMPANY LLC - CHARLEY CPF-3 | HEBER SPRINGS, Cleburne, AR | Pass | State |
| 2026-08-06 | GNB FORT SMITH LLC | FORT SMITH, Sebastian, AR | Pass | State |
| 2026-08-06 | GNB FORT SMITH LLC | FORT SMITH, Sebastian, AR | Pass | State |
| 2026-08-06 | GNB FORT SMITH LLC | FORT SMITH, Sebastian, AR | Pass | State |
| 2026-08-06 | GNB FORT SMITH LLC | FORT SMITH, Sebastian, AR | Pass | State |
| 2026-08-06 | GNB FORT SMITH LLC | FORT SMITH, Sebastian, AR | Pass | State |
| 2026-08-06 | GNB FORT SMITH LLC | FORT SMITH, Sebastian, AR | Pass | State |
| 2026-08-06 | GNB FORT SMITH LLC | FORT SMITH, Sebastian, AR | Pass | State |
| 2026-08-06 | GNB FORT SMITH LLC | FORT SMITH, Sebastian, AR | Pass | State |
| 2026-08-06 | GNB FORT SMITH LLC | FORT SMITH, Sebastian, AR | Pass | State |
| 2026-08-06 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-06 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-06 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-06 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-06 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-06 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-06 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-06 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-06 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-06 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-06 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-06 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-06 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-06 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-06 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-06 | BLACK HILLS ELECTRIC GENERATION - PAGS | PUEBLO, Pueblo, CO | Pass | State |
| 2026-08-06 | FMPA & KISSIMMEE UTILITY AUTHORITY | INTERCESSION CITY, Osceola, FL | Pass | State |
| 2026-08-06 | INTERNATIONAL PAPER COMPANY - ROME MILL | ROME, Floyd, GA | Pass | State |
| 2026-08-06 | C.W. MATTHEWS CONTRACTING CO., INC. - COLUMBUS ASPHALT PLANT | FORTSON, Muscogee, GA | Pass | State |
| 2026-08-06 | CLEARWATER PAPER CORPORATION - AUGUSTA MILL — high-priority violation on file | AUGUSTA, Richmond, GA | Pass | State |
| 2026-08-06 | ABBVIE INC | NORTH CHICAGO, Lake, IL | Pass | State |
| 2026-08-06 | LOUISVILLE GAS & ELECTRIC COMPANY, MILL CREEK GENERATING STATION | LOUISVILLE, Jefferson, KY | Pass | Local |
| 2026-08-06 | MARATHON PETROLEUM COMPANY LP — high-priority violation on file | DETROIT, Wayne, MI | Pass | State |
| 2026-08-06 | DTE ST. CLAIR / BELLE RIVER POWER PLANT — high-priority violation on file | CHINA, St. Clair, MI | Pass | State |
| 2026-08-06 | CONSUMERS ENERGY - RAY COMPRESSOR STATION | ARMADA, Macomb, MI | Pass | State |
| 2026-08-06 | FCA US LLC - CHRYSLER TECHNOLOGY CENTER | AUBURN HILLS, Oakland, MI | Pass | State |
| 2026-08-06 | HOLLAND BPW, 48TH STREET PEAKING STATION | HOLLAND, Allegan, MI | Pass | State |
| 2026-08-06 | CORE ENERGY LLC - DOVER 36 CPF | DOVER TOWNSHIP, Otsego, MI | Pass | State |
| 2026-08-06 | ARDAGH GLASS INC. | PEVELY, Jefferson, MO | Pass | State |
| 2026-08-06 | ARDAGH GLASS INC. | PEVELY, Jefferson, MO | Pass | State |
| 2026-08-06 | NCEMC - OCRACOKE | OCRACOKE, Hyde, NC | Pending | State |
| 2026-08-06 | CARGILL LACTIC ACID PLANT | BLAIR, Washington, NE | N/A | State |
| 2026-08-06 | NPPD SHELDON STATION | HALLAM, Lancaster, NE | Pass | Local |
| 2026-08-06 | DUNDEE & KOALA CTB 1 | LA HUERTA, Eddy, NM | Pass | State |
| 2026-08-06 | RIVERBEND 11-14 CTB 1 | MALAGA, Eddy, NM | Pass | State |
| 2026-08-06 | WHITE HORSE COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-08-06 | WALTER COMPRESSOR STATION | LOCO HILLS, Lea, NM | 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 2026. It lists 11,110 stack tests recorded nationwide in 2026.