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 |
|---|---|---|---|---|
| 2026-05-06 | CARROLLTON COMPRESSOR FACILITY | CARROLLTON, Carroll, OH | Pass | State |
| 2026-05-06 | CARROLLTON COMPRESSOR FACILITY | CARROLLTON, Carroll, OH | Pass | State |
| 2026-05-06 | CARROLLTON COMPRESSOR FACILITY | CARROLLTON, Carroll, OH | Pass | State |
| 2026-05-06 | CARROLLTON COMPRESSOR FACILITY | CARROLLTON, Carroll, OH | Pass | State |
| 2026-05-06 | CARROLLTON COMPRESSOR FACILITY | CARROLLTON, Carroll, OH | Pass | State |
| 2026-05-06 | CARROLLTON COMPRESSOR FACILITY | CARROLLTON, Carroll, OH | Pass | State |
| 2026-05-06 | CARROLLTON COMPRESSOR FACILITY | CARROLLTON, Carroll, OH | Pass | State |
| 2026-05-06 | CARROLLTON COMPRESSOR FACILITY | CARROLLTON, Carroll, OH | Pass | State |
| 2026-05-06 | CARROLLTON COMPRESSOR FACILITY | CARROLLTON, Carroll, OH | Pass | State |
| 2026-05-06 | CARROLLTON COMPRESSOR FACILITY | CARROLLTON, Carroll, OH | Pass | State |
| 2026-05-06 | CARROLLTON COMPRESSOR FACILITY | CARROLLTON, Carroll, OH | Pass | State |
| 2026-05-06 | ROVER PIPELINE - DEFIANCE COMPRESSOR STATION | DEFIANCE, Defiance, OH | Pass | State |
| 2026-05-06 | POET BIOREFINING - LEIPSIC — high-priority violation on file | LEIPSIC, Putnam, OH | Fail | State |
| 2026-05-06 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-05-06 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-05-06 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-05-06 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-05-06 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-05-06 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2026-05-06 | OWENS BROCKWAY GLASS CONTAINER INC. - PLANT #12 | ZANESVILLE, Muskingum, OH | Pass | State |
| 2026-05-06 | OWENS BROCKWAY GLASS CONTAINER INC. - PLANT #12 | ZANESVILLE, Muskingum, OH | Pass | State |
| 2026-05-06 | OWENS BROCKWAY GLASS CONTAINER INC. - PLANT #12 | ZANESVILLE, Muskingum, OH | Pass | State |
| 2026-05-06 | OWENS BROCKWAY GLASS CONTAINER INC. - PLANT #12 | ZANESVILLE, Muskingum, OH | Pass | State |
| 2026-05-06 | OWENS BROCKWAY GLASS CONTAINER INC. - PLANT #12 | ZANESVILLE, Muskingum, OH | Pass | State |
| 2026-05-06 | APPALACHIA MIDSTREAM SVC LLC/RATTLESNAKE HILL COMP STA | AUBURN TOWNSHIP, Susquehanna, PA | Pass | State |
| 2026-05-06 | BLACK HILLS POWER, INC. (LANGE) | RAPID CITY, Pennington, SD | Pass | State |
| 2026-05-06 | ALLEN COMBINED CYCLE PLANT - TVA | MEMPHIS, Shelby, TN | Pass | Local |
| 2026-05-05 | ROBERT'S TRUST COMPRESSOR STATION | DUNN COUNTY, Dunn, ND | Pass | U.S. EPA |
| 2026-05-05 | ROBERT'S TRUST COMPRESSOR STATION | DUNN COUNTY, Dunn, ND | Pass | U.S. EPA |
| 2026-05-05 | GOLDEN VALLEY ELECTRIC ASSOCIATION / HEALY POWER PLANT — high-priority violation on file | HEALY, Denali, AK | Pass | State |
| 2026-05-05 | INTERNATIONAL PAPER COMPANY | PRATTVILLE, Autauga, AL | Pass | State |
| 2026-05-05 | NUCOR STEEL BIRMINGHAM,INC. | BIRMINGHAM, Jefferson, AL | Pass | Local |
| 2026-05-05 | NUCOR STEEL BIRMINGHAM,INC. | BIRMINGHAM, Jefferson, AL | Pass | Local |
| 2026-05-05 | MERIT ENERGY COMPANY, LLC - PETERPENDER CP | CHARLESTON, Franklin, AR | Pass | State |
| 2026-05-05 | MERIT ENERGY COMPANY, LLC - PETERPENDER CP | CHARLESTON, Franklin, AR | Pass | State |
| 2026-05-05 | DESOTO GATHERING COMPANY, LLC.-OLIVER CPF-1 | SEARCY, White, AR | Pass | State |
| 2026-05-05 | DESOTO GATHERING COMPANY, LLC.-OLIVER CPF-1 | SEARCY, White, AR | Pass | State |
| 2026-05-05 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-05-05 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-05-05 | AMRIZE PORTLAND PLANT — high-priority violation on file | FLORENCE 3.8 MI. E OF, Fremont, CO | Pass | State |
| 2026-05-05 | ALLIED PRINTING SERVICES, INC | MANCHESTER, Hartford, CT | Pass | State |
| 2026-05-05 | GEORGE WASHINGTON UNIVERSITY — high-priority violation on file | WASHINGTON, District of Columbia, DC | Pass | State |
| 2026-05-05 | DUPONT EXPERIMENTAL STATION | WILMINGTON, New Castle, DE | Pass | State |
| 2026-05-05 | DUPONT EXPERIMENTAL STATION | WILMINGTON, New Castle, DE | Pass | State |
| 2026-05-05 | DUPONT EXPERIMENTAL STATION | WILMINGTON, New Castle, DE | Pass | State |
| 2026-05-05 | KRATON CHEMICAL, LLC | PANAMA CITY, Bay, FL | Pass | State |
| 2026-05-05 | VANDOLAH POWER COMPANY, LLC | WAUCHULA, Hardee, FL | Pass | State |
| 2026-05-05 | VANDOLAH POWER COMPANY, LLC | WAUCHULA, Hardee, FL | Pass | State |
| 2026-05-05 | VANDOLAH POWER COMPANY, LLC | WAUCHULA, Hardee, FL | Pass | State |
| 2026-05-05 | VANDOLAH POWER COMPANY, LLC | WAUCHULA, Hardee, FL | Pass | State |
| 2026-05-05 | PASCO COUNTY | SHADY HILLS, Pasco, FL | Pass | State |
| 2026-05-05 | PASCO COUNTY | SHADY HILLS, Pasco, FL | Pass | State |
| 2026-05-05 | PASCO COUNTY | SHADY HILLS, Pasco, FL | Pass | State |
| 2026-05-05 | PASCO COUNTY | SHADY HILLS, Pasco, FL | Pass | State |
| 2026-05-05 | PASCO COUNTY | SHADY HILLS, Pasco, FL | Pass | State |
| 2026-05-05 | PASCO COUNTY | SHADY HILLS, Pasco, FL | Pass | State |
| 2026-05-05 | PASCO COUNTY | SHADY HILLS, Pasco, FL | Pass | State |
| 2026-05-05 | PASCO COUNTY | SHADY HILLS, Pasco, FL | Pass | State |
| 2026-05-05 | PASCO COUNTY | SHADY HILLS, Pasco, FL | Pass | State |
| 2026-05-05 | MOSAIC FERTILIZER LLC — high-priority violation on file | MULBERRY, Polk, FL | Pass | State |
| 2026-05-05 | MOSAIC FERTILIZER LLC — high-priority violation on file | MULBERRY, Polk, FL | Pass | State |
| 2026-05-05 | E.R. SNELL EATONTON PLANT | EATONTON, Putnam, GA | Pass | State |
| 2026-05-05 | RAYONIER PERFORMANCE FIBERS, LLC | JESUP, Wayne, GA | Pass | State |
| 2026-05-05 | RAYONIER PERFORMANCE FIBERS, LLC | JESUP, Wayne, GA | Pass | State |
| 2026-05-05 | ZINPRO CORP - GARNER — high-priority violation on file | GARNER, Hancock, IA | Fail | State |
| 2026-05-05 | NATURALLY RECYCLED PROTEINS OF IOWA LLC | STEAMBOAT ROCK, Hardin, IA | Pass | State |
| 2026-05-05 | MAQUOKETA MUNICIPAL ELECTRIC UTILITY-N&S | MAQUOKETA (HISTORICAL), Jackson, IA | Pass | State |
| 2026-05-05 | UNITED STATES GYPSUM COMPANY | EAST SHOALS, Martin, IN | Pass | State |
| 2026-05-05 | UNITED STATES GYPSUM COMPANY | EAST SHOALS, Martin, IN | Pass | State |
| 2026-05-05 | UNITED STATES GYPSUM COMPANY | EAST SHOALS, Martin, IN | Pass | State |
| 2026-05-05 | UNITED STATES GYPSUM COMPANY | EAST SHOALS, Martin, IN | Pass | State |
| 2026-05-05 | UNITED STATES GYPSUM COMPANY | EAST SHOALS, Martin, IN | Pass | State |
| 2026-05-05 | UNITED STATES GYPSUM COMPANY | EAST SHOALS, Martin, IN | Pass | State |
| 2026-05-05 | UNITED STATES GYPSUM COMPANY | EAST SHOALS, Martin, IN | Pass | State |
| 2026-05-05 | UNITED STATES GYPSUM COMPANY | EAST SHOALS, Martin, IN | Pass | State |
| 2026-05-05 | UNITED STATES GYPSUM COMPANY | EAST SHOALS, Martin, IN | Pass | State |
| 2026-05-05 | CLEVELAND-CLIFFS BURNS HARBOR LLC — high-priority violation on file | BURNS HARBOR, Porter, IN | Pass | State |
| 2026-05-05 | HORTON MUN. POWER PLANT (AIR) | HORTON, Brown, KS | Pass | State |
| 2026-05-05 | AMERICAN SYNTHETIC RUBBER COMPANY — high-priority violation on file | LOUISVILLE, Jefferson, KY | Fail | Local |
| 2026-05-05 | MASSPORT LOGAN AIRPORT | BOSTON, CITY OF, Suffolk, MA | Pending | State |
| 2026-05-05 | CONSUMERS ENERGY - FREEDOM COMPRESSOR STATION | MANCHESTER, Washtenaw, MI | Pass | State |
| 2026-05-05 | ANR PIPELINE COMPANY - HAMILTON COMPRESSOR STATION | HAMILTON, Allegan, MI | Pass | State |
| 2026-05-05 | RIVERSIDE ENERGY MICHIGAN, LLC CHESTER 10 CO2 RECOVERY | CHESTER TWP, Otsego, MI | Pass | State |
| 2026-05-05 | ENERGY DEVELOPMENTS COOPERSVILLE — high-priority violation on file | COOPERSVILLE, Ottawa, MI | Pass | State |
| 2026-05-05 | UNIVERSAL COATING INC. | FLINT, Genesee, MI | Pass | State |
| 2026-05-05 | XCEL ENERGY - WILMARTH GENERATING PLANT | MANKATO, Blue Earth, MN | Pass | State |
| 2026-05-05 | MINNESOTA POWER - BOSWELL ENERGY CENTER | COHASSET, Itasca, MN | Pass | State |
| 2026-05-05 | XCEL ENERGY - SHERBURNE COUNTY GENERATING PLANT | BECKER, Sherburne, MN | Pass | State |
| 2026-05-05 | ELK RIVER LANDFILL, INC. | ELK RIVER, Sherburne, MN | Pass | State |
| 2026-05-05 | JEFFERSON CITY LANDFILL, LLC | JEFFERSON CITY, Cole, MO | Pass | State |
| 2026-05-05 | ENSTOR GAS, LLC, MISSISSIPPI HUB EXPANSION PROJECT — high-priority violation on file | MAGEE, Simpson, MS | Pass | State |
| 2026-05-05 | ENSTOR GAS, LLC, MISSISSIPPI HUB EXPANSION PROJECT — high-priority violation on file | MAGEE, Simpson, MS | Pass | State |
| 2026-05-05 | ENSTOR GAS, LLC, MISSISSIPPI HUB EXPANSION PROJECT — high-priority violation on file | MAGEE, Simpson, MS | Pass | State |
| 2026-05-05 | ENSTOR GAS, LLC, MISSISSIPPI HUB EXPANSION PROJECT — high-priority violation on file | MAGEE, Simpson, MS | Pass | State |
| 2026-05-05 | ENSTOR GAS, LLC, MISSISSIPPI HUB EXPANSION PROJECT — high-priority violation on file | MAGEE, Simpson, MS | Pass | State |
| 2026-05-05 | ENSTOR GAS, LLC, MISSISSIPPI HUB EXPANSION PROJECT — high-priority violation on file | MAGEE, Simpson, MS | Pass | State |
| 2026-05-05 | BAKELITE CHEMICALS LLC, TAYLORSVILLE — high-priority violation on file | TAYLORSVILLE, Smith, MS | Pass | State |
| 2026-05-05 | BAKELITE CHEMICALS LLC, TAYLORSVILLE — high-priority violation on file | TAYLORSVILLE, Smith, MS | Pass | State |
| 2026-05-05 | BAKELITE CHEMICALS LLC, TAYLORSVILLE — high-priority violation on file | TAYLORSVILLE, Smith, MS | Pass | State |
| 2026-05-05 | WHITE STREET RENEWABLES, LLC | GREENSBORO, Guilford, NC | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.