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 |
|---|---|---|---|---|
| 2026-04-29 | RED TANK 26 BOO STATION | MONUMENT, Lea, NM | Pass | State |
| 2026-04-29 | EOG RESOURCES, INC. - BLACKBIRD COMPRESSOR STATION | BROWN, TOWNSHIP OF, Carroll, OH | Pass | State |
| 2026-04-29 | HILCORP ENERGY - FAIRFIELD-NOLKER PRODUCTION FACILITY | LEETONIA, Columbiana, OH | Pass | State |
| 2026-04-29 | HILCORP ENERGY - FAIRFIELD-NOLKER PRODUCTION FACILITY | LEETONIA, Columbiana, OH | Pass | State |
| 2026-04-29 | HILCORP ENERGY - ELK RUN AUER PRODUCTION FACILITY | LISBON, Columbiana, OH | Pass | State |
| 2026-04-29 | HILCORP ENERGY - ELK RUN AUER PRODUCTION FACILITY | LISBON, Columbiana, OH | Pass | State |
| 2026-04-29 | HILCORP ENERGY - ELK RUN AUER PRODUCTION FACILITY | LISBON, Columbiana, OH | Pass | State |
| 2026-04-29 | WIN WASTE INNOVATIONS OF SENECA COUNTY | FOSTORIA, Seneca, OH | Pass | State |
| 2026-04-29 | EOG RESOURCES, INC. - PECKENS JN SAL 21-10-3 PAD | RICHMOND, Jefferson, OH | Pass | State |
| 2026-04-29 | EOG RESOURCES, INC. - PECKENS JN SAL 21-10-3 PAD | RICHMOND, Jefferson, OH | Pass | State |
| 2026-04-29 | EOG RESOURCES, INC. - PECKENS JN SAL 21-10-3 PAD | RICHMOND, Jefferson, OH | Pass | State |
| 2026-04-29 | MARKWEST LAREW COMPRESSOR STATION | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-04-29 | MARKWEST LAREW COMPRESSOR STATION | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-04-29 | MARKWEST LAREW COMPRESSOR STATION | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-04-29 | MARKWEST LAREW COMPRESSOR STATION | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-04-29 | MARKWEST LAREW COMPRESSOR STATION | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-04-29 | MARKWEST LAREW COMPRESSOR STATION | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-04-29 | MARKWEST LAREW COMPRESSOR STATION | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-04-29 | MARKWEST LAREW COMPRESSOR STATION | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-04-29 | MARKWEST LAREW COMPRESSOR STATION | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-04-29 | EOG RESOURCES, INC. - PEARLEY TC PER PAD | STILLWATER, Tuscarawas, OH | Pass | State |
| 2026-04-29 | EOG RESOURCES, INC. - PEARLEY TC PER PAD | STILLWATER, Tuscarawas, OH | Pass | State |
| 2026-04-29 | EOG RESOURCES, INC. - PEARLEY TC PER PAD | STILLWATER, Tuscarawas, OH | Pass | State |
| 2026-04-29 | GOLD BOND BLDG PROD/SHIPPINGPORT | SHIPPINGPORT, Beaver, PA | Pending | State |
| 2026-04-29 | HILCORP ENERGY CO/LACKAWANNOCK LARMON CTL FAC | MERCER, Mercer, PA | Pass | State |
| 2026-04-29 | PETE LIEN & SONS, INC. MAIN PLANT | RAPID CITY, Pennington, SD | Pass | State |
| 2026-04-29 | HF SINCLAIR WOODS CROSS REFINERY (FORMERLY HOLLY) | WOODS CROSS, Davis, UT | Pass | State |
| 2026-04-29 | HF SINCLAIR WOODS CROSS REFINERY (FORMERLY HOLLY) | WOODS CROSS, Davis, UT | Pass | State |
| 2026-04-29 | AMAZON DATA SERVICES, INC. IAD 50 IAD 60 IAD-71 IAD-78 IAD-79 IAD-80 | ASHBURN, Loudoun, VA | Pass | State |
| 2026-04-29 | MONONGAHELA POWER COMPANY, FORT MARTIN STATION | MAIDSVILLE, Monongalia, WV | Pass | State |
| 2026-04-29 | DAVE JOHNSTON (PACIFICORP) | GLENROCK, Converse, WY | Pass | State |
| 2026-04-29 | DAVE JOHNSTON (PACIFICORP) | GLENROCK, Converse, WY | Pass | State |
| 2026-04-28 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | SWEET WATER, Marengo, AL | Pass | State |
| 2026-04-28 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | SWEET WATER, Marengo, AL | Pass | State |
| 2026-04-28 | SOUTHERN NATURAL GAS | REFORM, Pickens, AL | Pass | State |
| 2026-04-28 | SOUTHERN NATURAL GAS | REFORM, Pickens, AL | Pass | State |
| 2026-04-28 | KYKENKEE INC/KUTZ LLC | VANCE, Tuscaloosa, AL | Pass | State |
| 2026-04-28 | KYKENKEE INC/KUTZ LLC | VANCE, Tuscaloosa, AL | Pass | State |
| 2026-04-28 | INTERNATIONAL PAPER | PINE HILL, Wilcox, AL | Pass | State |
| 2026-04-28 | INTERNATIONAL PAPER | PINE HILL, Wilcox, AL | Pass | State |
| 2026-04-28 | INTERNATIONAL PAPER | PINE HILL, Wilcox, AL | Pass | State |
| 2026-04-28 | ALABAMA POWER COMPANY (MILLER POWER PLANT) | QUINTON, Jefferson, AL | Pass | Local |
| 2026-04-28 | DEFENDER GAS PRODUCERS LLC - WILSON CREEK | CLINTON, Van Buren, AR | Pass | State |
| 2026-04-28 | SUNSHINE CYN LANDFILL REPUBLIC SERV INC | SYLMAR, Los Angeles, CA | Pass | Local |
| 2026-04-28 | SOUTHERN CALIFORNIA EDISON | RANCHO CUCAMONGA, San Bernardino, CA | Pass | Local |
| 2026-04-28 | E&J GALLO WINERY — high-priority violation on file | LIVINGSTON, Merced, CA | Pass | Local |
| 2026-04-28 | E&J GALLO WINERY — high-priority violation on file | LIVINGSTON, Merced, CA | Pass | Local |
| 2026-04-28 | E&J GALLO WINERY — high-priority violation on file | LIVINGSTON, Merced, CA | Pass | Local |
| 2026-04-28 | AERA ENERGY LLC | VENTURA, Ventura, CA | Pass | Local |
| 2026-04-28 | MICROCHIP TECHNOLOGY INCORPORATED | COLORADO SPRINGS, El Paso, CO | Pass | State |
| 2026-04-28 | PLAINS END, LLC | ARVADA, Jefferson, CO | Pass | State |
| 2026-04-28 | BIMBO BAKERIES USA, INC. | GREENWICH, Fairfield, CT | Pass | State |
| 2026-04-28 | SOLID WASTE AUTHORITY OF PBC | WEST PALM BEACH, Palm Beach, FL | Pass | State |
| 2026-04-28 | SOLID WASTE AUTHORITY OF PBC | WEST PALM BEACH, Palm Beach, FL | Pass | State |
| 2026-04-28 | SOLID WASTE AUTHORITY OF PBC | WEST PALM BEACH, Palm Beach, FL | Pass | State |
| 2026-04-28 | SOLID WASTE AUTHORITY OF PBC | WEST PALM BEACH, Palm Beach, FL | Pass | State |
| 2026-04-28 | SOLID WASTE AUTHORITY OF PBC | WEST PALM BEACH, Palm Beach, FL | Pass | State |
| 2026-04-28 | SOLID WASTE AUTHORITY OF PBC | WEST PALM BEACH, Palm Beach, FL | Pass | State |
| 2026-04-28 | SOLID WASTE AUTHORITY OF PBC | WEST PALM BEACH, Palm Beach, FL | Pass | State |
| 2026-04-28 | SOLID WASTE AUTHORITY OF PBC | WEST PALM BEACH, Palm Beach, FL | Pass | State |
| 2026-04-28 | SOLID WASTE AUTHORITY OF PBC | WEST PALM BEACH, Palm Beach, FL | Pass | State |
| 2026-04-28 | SOLID WASTE AUTHORITY OF PBC | WEST PALM BEACH, Palm Beach, FL | Pass | State |
| 2026-04-28 | SOLID WASTE AUTHORITY OF PBC | WEST PALM BEACH, Palm Beach, FL | Pass | State |
| 2026-04-28 | SOLID WASTE AUTHORITY OF PBC | WEST PALM BEACH, Palm Beach, FL | Pass | State |
| 2026-04-28 | SOLID WASTE AUTHORITY OF PBC | WEST PALM BEACH, Palm Beach, FL | Pass | State |
| 2026-04-28 | SOLID WASTE AUTHORITY OF PBC | WEST PALM BEACH, Palm Beach, FL | Pass | State |
| 2026-04-28 | SOLID WASTE AUTHORITY OF PBC | WEST PALM BEACH, Palm Beach, FL | Pass | State |
| 2026-04-28 | SOLID WASTE AUTHORITY OF PBC | WEST PALM BEACH, Palm Beach, FL | Pass | State |
| 2026-04-28 | SOLID WASTE AUTHORITY OF PBC | WEST PALM BEACH, Palm Beach, FL | Pass | State |
| 2026-04-28 | SOLID WASTE AUTHORITY OF PBC | WEST PALM BEACH, Palm Beach, FL | Pass | State |
| 2026-04-28 | SOLID WASTE AUTHORITY OF PBC | WEST PALM BEACH, Palm Beach, FL | Pass | State |
| 2026-04-28 | GA POWER CO. - PLANT SCHERER | JULIETTE, Monroe, GA | Pass | State |
| 2026-04-28 | GA POWER CO. - PLANT SCHERER | JULIETTE, Monroe, GA | Pass | State |
| 2026-04-28 | GA POWER CO. - PLANT SCHERER | JULIETTE, Monroe, GA | Pass | State |
| 2026-04-28 | GA POWER CO. - PLANT SCHERER | JULIETTE, Monroe, GA | Pass | State |
| 2026-04-28 | CARGILL ANIMAL NUTRITION - SIOUX CITY — high-priority violation on file | SIOUX CITY, Woodbury, IA | Fail | State |
| 2026-04-28 | VALTO INC | GOSHEN, Elkhart, IN | Pass | State |
| 2026-04-28 | NOVAE LLC — high-priority violation on file | MARKLE, Wells, IN | Pass | State |
| 2026-04-28 | NOVAE LLC — high-priority violation on file | MARKLE, Wells, IN | Pass | State |
| 2026-04-28 | NOVAE LLC — high-priority violation on file | MARKLE, Wells, IN | Pass | State |
| 2026-04-28 | NOVAE LLC — high-priority violation on file | MARKLE, Wells, IN | Pass | State |
| 2026-04-28 | NUCOR STEEL — high-priority violation on file | CRAWFORDSVILLE, Montgomery, IN | Pass | State |
| 2026-04-28 | NUCOR STEEL — high-priority violation on file | CRAWFORDSVILLE, Montgomery, IN | Pass | State |
| 2026-04-28 | NUCOR STEEL — high-priority violation on file | CRAWFORDSVILLE, Montgomery, IN | Pass | State |
| 2026-04-28 | NUCOR STEEL — high-priority violation on file | CRAWFORDSVILLE, Montgomery, IN | Pass | State |
| 2026-04-28 | HARSHMAN CONST (MASTER EQUIP LIST) (AIR) | CEDAR POINT, Marion, KS | Pass | State |
| 2026-04-28 | JAYBIRD & MAIS INC | LAWRENCE, CITY OF, Essex, MA | Pending | State |
| 2026-04-28 | DOMINION ENERGY COVE POINT LNG, LP | LUSBY, Calvert, MD | Pass | State |
| 2026-04-28 | MICHIGAN STATE UNIVERSITY | EAST LANSING, Ingham, MI | Pass | State |
| 2026-04-28 | ZEELAND FARM SERVICES, INC. — high-priority violation on file | ZEELAND, Ottawa, MI | Pass | State |
| 2026-04-28 | TOEFCO ENGINEERED COATING SYSTEMS | NILES, Berrien, MI | Pass | State |
| 2026-04-28 | POLK COUNTY RESOURCE RECOVERY FACILITY | FOSSTON, Polk, MN | Pass | State |
| 2026-04-28 | CALGON CARBON CORPORATION | BAY ST. LOUI, Hancock, MS | Pass | State |
| 2026-04-28 | CHEVRON USA INC, CHEVRON PRODUCTS COMPANY, PASCAGOULA REFINERY | PASCAGOULA, Jackson, MS | Pass | State |
| 2026-04-28 | COOPERATIVE ENERGY, A MISSISSIPPI ELECTRIC COOPERATIVE, SYLVARENA GENERATING PLA — high-priority violation on file | BAY SPRINGS, Smith, MS | Pass | State |
| 2026-04-28 | PCS PHOSPHATE COMPANY, INC. - AURORA | AURORA, Beaufort, NC | Pass | State |
| 2026-04-28 | MURPHY-BROWN LLC WARSAW FEED MILL | WARSAW, Duplin, NC | Pass | State |
| 2026-04-28 | AGP SOY PROCESSING — high-priority violation on file | HASTINGS, Adams, NE | N/A | State |
| 2026-04-28 | BERTRAND COMPRESSOR STATION | LOOMIS, Phelps, NE | Pass | State |
| 2026-04-28 | ENTERPRISE - CEDAR CANYON COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.