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 |
|---|---|---|---|---|
| 2026-04-16 | DOUGLAS GAS PLANT (TALLGRASS MIDSTREAM) | DOUGLAS, Converse, WY | Pass | State |
| 2026-04-16 | DOUGLAS GAS PLANT (TALLGRASS MIDSTREAM) | DOUGLAS, Converse, WY | Pass | State |
| 2026-04-16 | DOUGLAS GAS PLANT (TALLGRASS MIDSTREAM) | DOUGLAS, Converse, WY | Pass | State |
| 2026-04-16 | DOUGLAS GAS PLANT (TALLGRASS MIDSTREAM) | DOUGLAS, Converse, WY | Pass | State |
| 2026-04-16 | DOUGLAS GAS PLANT (TALLGRASS MIDSTREAM) | DOUGLAS, Converse, WY | Pass | State |
| 2026-04-16 | DOUGLAS GAS PLANT (TALLGRASS MIDSTREAM) | DOUGLAS, Converse, WY | Pass | State |
| 2026-04-16 | DOUGLAS GAS PLANT (TALLGRASS MIDSTREAM) | DOUGLAS, Converse, WY | Pass | State |
| 2026-04-16 | DOUGLAS GAS PLANT (TALLGRASS MIDSTREAM) | DOUGLAS, Converse, WY | Pass | State |
| 2026-04-16 | DOUGLAS GAS PLANT (TALLGRASS MIDSTREAM) | DOUGLAS, Converse, WY | Pass | State |
| 2026-04-16 | DOUGLAS GAS PLANT (TALLGRASS MIDSTREAM) | DOUGLAS, Converse, WY | Pass | State |
| 2026-04-16 | DOUGLAS GAS PLANT (TALLGRASS MIDSTREAM) | DOUGLAS, Converse, WY | Pass | State |
| 2026-04-16 | DOUGLAS GAS PLANT (TALLGRASS MIDSTREAM) | DOUGLAS, Converse, WY | Pass | State |
| 2026-04-16 | DOUGLAS GAS PLANT (TALLGRASS MIDSTREAM) | DOUGLAS, Converse, WY | Pass | State |
| 2026-04-16 | DOUGLAS GAS PLANT (TALLGRASS MIDSTREAM) | DOUGLAS, Converse, WY | Pass | State |
| 2026-04-16 | DOUGLAS GAS PLANT (TALLGRASS MIDSTREAM) | DOUGLAS, Converse, WY | Pass | State |
| 2026-04-16 | DOUGLAS GAS PLANT (TALLGRASS MIDSTREAM) | DOUGLAS, Converse, WY | Pass | State |
| 2026-04-16 | DOUGLAS GAS PLANT (TALLGRASS MIDSTREAM) | DOUGLAS, Converse, WY | Pass | State |
| 2026-04-15 | KRONOSPAN USA — high-priority violation on file | EASTABOGA, Calhoun, AL | Pass | State |
| 2026-04-15 | KRONOSPAN USA — high-priority violation on file | EASTABOGA, Calhoun, AL | Pass | State |
| 2026-04-15 | KRONOSPAN USA — high-priority violation on file | EASTABOGA, Calhoun, AL | Pass | State |
| 2026-04-15 | ALABAMA POWER COMPANY (MILLER POWER PLANT) | QUINTON, Jefferson, AL | Pass | Local |
| 2026-04-15 | DESOTO GATHERING COMPANY, LLC - SOUTH RAINBOW | CENTER RIDGE, Conway, AR | Pass | State |
| 2026-04-15 | DESOTO GATHERING COMPANY, LLC - STURGEON CPF-3 | CENTER RIDGE, Conway, AR | Pass | State |
| 2026-04-15 | BIG RIVER STEEL LLC | OSCEOLA, Mississippi, AR | Pass | State |
| 2026-04-15 | LA CO. SANITATION DIST | CARSON, Los Angeles, CA | Pass | Local |
| 2026-04-15 | LARAMIE ENERGY - MVS COMPRESSOR STATION | COLLBRAN 10.8 MI. E OF, Mesa, CO | Pass | State |
| 2026-04-15 | QUIKRETE CONSTRUCTION MATERIALS, LLC | NEWBERRY, Alachua, FL | Pass | State |
| 2026-04-15 | QUIKRETE CONSTRUCTION MATERIALS, LLC | NEWBERRY, Alachua, FL | Pass | State |
| 2026-04-15 | QUIKRETE CONSTRUCTION MATERIALS, LLC | NEWBERRY, Alachua, FL | Pass | State |
| 2026-04-15 | NEENAH FOUNDRY COMPANY | MEDLEY, Miami-Dade, FL | Pass | State |
| 2026-04-15 | GEORGIA-PACIFIC PALATKA LLC — high-priority violation on file | PALATKA, Putnam, FL | Pass | State |
| 2026-04-15 | GRAPHIC PACKAGING INTERNATIONAL, LLC - MACON MILL | MACON, Bibb, GA | Pass | State |
| 2026-04-15 | MAS GEORGIA LFG, LLC (PINE RIDGE) | GRIFFIN, Butts, GA | Pass | State |
| 2026-04-15 | MAS GEORGIA LFG, LLC (PINE RIDGE) | GRIFFIN, Butts, GA | Pass | State |
| 2026-04-15 | MAS GEORGIA LFG, LLC (PINE RIDGE) | GRIFFIN, Butts, GA | Pass | State |
| 2026-04-15 | TROJAN BATTERY COMPANY, LLC | LITHONIA, DeKalb, GA | Pass | State |
| 2026-04-15 | TROJAN BATTERY COMPANY, LLC | LITHONIA, DeKalb, GA | Pass | State |
| 2026-04-15 | CLEARWATER PAPER CORPORATION - AUGUSTA MILL — high-priority violation on file | AUGUSTA, Richmond, GA | Pass | State |
| 2026-04-15 | POET BIOREFINING - ARTHUR, LLC — high-priority violation on file | ARTHUR, Ida, IA | Pass | State |
| 2026-04-15 | GRAIN PROCESSING CORP — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2026-04-15 | DES MOINES METRO WRA | DES MOINES, Polk, IA | Pass | Local |
| 2026-04-15 | DES MOINES METRO WRA | DES MOINES, Polk, IA | Pass | Local |
| 2026-04-15 | NORTHWEST PIPELINE LLC PEGRAM | PEGRAM, Bear Lake, ID | Pass | State |
| 2026-04-15 | ADVOCATE ILLINOIS MASONIC MEDICAL CENTER | CHICAGO, Cook, IL | Pass | State |
| 2026-04-15 | RUMPKE LANDFILL 33 | EFFINGHAM, Effingham, IL | Pass | State |
| 2026-04-15 | CLARIOS LLC | GENEVA, Kane, IL | Pass | State |
| 2026-04-15 | C & D TECHNOLOGIES INC | ATTICA, Fountain, IN | Pass | State |
| 2026-04-15 | C & D TECHNOLOGIES INC | ATTICA, Fountain, IN | Pass | State |
| 2026-04-15 | GEORGIA PACIFIC GYPSUM LLC — high-priority violation on file | WHEATFIELD, Jasper, IN | Pass | State |
| 2026-04-15 | GEORGIA PACIFIC GYPSUM LLC — high-priority violation on file | WHEATFIELD, Jasper, IN | Pass | State |
| 2026-04-15 | GEORGIA PACIFIC GYPSUM LLC — high-priority violation on file | WHEATFIELD, Jasper, IN | Pass | State |
| 2026-04-15 | GEORGIA PACIFIC GYPSUM LLC — high-priority violation on file | WHEATFIELD, Jasper, IN | Pass | State |
| 2026-04-15 | HOWMET CASTINGS AND SERVICES INCORPORATED | LA PORTE, LaPorte, IN | Pass | State |
| 2026-04-15 | HOWMET CASTINGS AND SERVICES INCORPORATED | LA PORTE, LaPorte, IN | Pass | State |
| 2026-04-15 | HOWMET CASTINGS AND SERVICES INCORPORATED | LA PORTE, LaPorte, IN | Pass | State |
| 2026-04-15 | HOWMET CASTINGS AND SERVICES INCORPORATED | LA PORTE, LaPorte, IN | Pass | State |
| 2026-04-15 | HOWMET CASTINGS AND SERVICES INCORPORATED | LA PORTE, LaPorte, IN | Pass | State |
| 2026-04-15 | PANHANDLE EASTERN PIPE LINE - OLPE STATION (AIR) | OLPE, Lyon, KS | Pass | State |
| 2026-04-15 | CENTERS FOR MEDICARE & MEDICAID SERVICES | WINDSOR MILL, Baltimore, MD | Pass | State |
| 2026-04-15 | EES COKE BATTERY, LLC — high-priority violation on file | DETROIT, Wayne, MI | Pass | State |
| 2026-04-15 | MICHIGAN FOAM PRODUCTS, LLC | WYOMING, Kent, MI | Pass | State |
| 2026-04-15 | SAINT CLOUD WWTP | SAINT CLOUD, Stearns, MN | Pass | State |
| 2026-04-15 | CHEVRON USA INC, CHEVRON PRODUCTS COMPANY, PASCAGOULA REFINERY | PASCAGOULA, Jackson, MS | Pass | State |
| 2026-04-15 | ROBESON COUNTY LANDFILL | SAINT PAULS, Robeson, NC | Pending | State |
| 2026-04-15 | TIGT BIG SPRINGS STATION | BIG SPRINGS, Deuel, NE | Pass | State |
| 2026-04-15 | NORTHERN NATURAL GAS COMPANY | FREMONT, Dodge, NE | Pass | State |
| 2026-04-15 | WHEELABRATOR CONCORD COMPANY, L.P. | CONCORD, Merrimack, NH | Pass | State |
| 2026-04-15 | GRANDI COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2026-04-15 | LONGWOOD - STEBBINS COMPRESSOR STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2026-04-15 | LONGWOOD - STEBBINS COMPRESSOR STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2026-04-15 | LONGWOOD - STEBBINS COMPRESSOR STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2026-04-15 | LONGWOOD - STEBBINS COMPRESSOR STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2026-04-15 | TAR HEEL 19 CTB | MALAGA, Eddy, NM | Pass | State |
| 2026-04-15 | TAR HEEL 19 CTB | MALAGA, Eddy, NM | Pass | State |
| 2026-04-15 | BIG SINKS COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2026-04-15 | BIG SINKS COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2026-04-15 | WHITBY FED COM TB | LA HUERTA, Eddy, NM | Pass | State |
| 2026-04-15 | WHITBY FED COM TB | LA HUERTA, Eddy, NM | Pass | State |
| 2026-04-15 | ENTERPRISE - DEVON RATTLESNAKE COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-04-15 | ENTERPRISE - DEVON RATTLESNAKE COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-04-15 | COTTON DRAW SECTION 3 COMPRESSOR STATION | MALAGA, Lea, NM | Pass | State |
| 2026-04-15 | FALCON RIDGE CGL | JAL, Lea, NM | Pass | State |
| 2026-04-15 | FALCON RIDGE CGL | JAL, Lea, NM | Pass | State |
| 2026-04-15 | FALCON RIDGE CGL | JAL, Lea, NM | Pass | State |
| 2026-04-15 | FALCON RIDGE CGL | JAL, Lea, NM | Pass | State |
| 2026-04-15 | GUNNER FED 5 B CTB | JAL, Lea, NM | Pass | State |
| 2026-04-15 | GUNNER FED 5 B CTB | JAL, Lea, NM | Pass | State |
| 2026-04-15 | SOFIDEL AMERICA — high-priority violation on file | CIRCLEVILLE, Pickaway, OH | Pass | State |
| 2026-04-15 | SOFIDEL AMERICA — high-priority violation on file | CIRCLEVILLE, Pickaway, OH | Pass | State |
| 2026-04-15 | SOFIDEL AMERICA — high-priority violation on file | CIRCLEVILLE, Pickaway, OH | Pass | State |
| 2026-04-15 | SOFIDEL AMERICA — high-priority violation on file | CIRCLEVILLE, Pickaway, OH | Pass | State |
| 2026-04-15 | CLEVELAND-CLIFFS, INC. - MANSFIELD OPERATIONS | MANSFIELD, Richland, OH | Pass | State |
| 2026-04-15 | CLEVELAND-CLIFFS, INC. - MANSFIELD OPERATIONS | MANSFIELD, Richland, OH | Pass | State |
| 2026-04-15 | KEYSTONE CONEMAUGH PROJ LLC/CONEMAUGH STATION | NEW FLORENCE, Indiana, PA | Pass | State |
| 2026-04-15 | REGENCY MARCELLUS GAS GATHERING LLC/LONE WALNUT COMP STA | JERSEY SHORE, Lycoming, PA | Pass | State |
| 2026-04-15 | ETC NORTHEAST PIPELINE LLC/RED BEND COMP STA | TROUT RUN, Lycoming, PA | Pass | State |
| 2026-04-15 | WILLIAMS FIELD SVC CO LLC/FRASER COMP STA | MONTROSE, Susquehanna, PA | Pass | State |
| 2026-04-15 | WILLIAMS FIELD SVC CO LLC/MILLER COMP STA | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2026-04-15 | MARKWEST LIBERTY MIDST & RES/IMPERIAL CIBUS RANCH COMP STA | ROBINSON, Washington, PA | Pass | State |
| 2026-04-15 | EXPAND OPERATING LLC/CURTIN WYO PAD | LACEYVILLE, Wyoming, PA | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.