EPA Air · stack tests by year
Air-emissions stack tests in 2025
- 26,291Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
States, 2025
- California 5,390
- Ohio 2,213
- New Mexico 1,801
- Indiana 1,619
- Florida 1,419
- Wyoming 1,362
- Georgia 1,233
- Oklahoma 1,229
- Pennsylvania 951
- Missouri 768
- Alabama 693
- Mississippi 688
- Arkansas 619
- Iowa 500
- Colorado 405
- Michigan 387
- Texas 308
- North Carolina 275
- Illinois 264
- Washington 251
- Wisconsin 245
- Minnesota 238
- West Virginia 224
- Delaware 212
- South Carolina 210
- Kentucky 204
- Kansas 202
- Connecticut 178
- Utah 175
- Montana 174
- Virginia 170
- Tennessee 168
- Alaska 152
- Nebraska 145
- North Dakota 143
- Maine 131
- New York 124
- Louisiana 117
- Arizona 116
- Idaho 111
- Nevada 73
- New Hampshire 59
- Massachusetts 59
- Oregon 56
- Hawaii 53
- Maryland 51
- South Dakota 46
- Rhode Island 30
- District of Columbia 28
- Puerto Rico 14
- Vermont 4
- New Jersey 4
Other years
Air-emissions stack tests recorded in 2025
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2025-08-28 | TARGA PIPELINE MIDCONTINENT LLC / TIVIS COMPRESSOR STATION | RATLIFF CITY, Carter, OK | Pass | State |
| 2025-08-28 | TARGA PIPELINE MIDCONTINENT LLC / TIVIS COMPRESSOR STATION | RATLIFF CITY, Carter, OK | Pass | State |
| 2025-08-28 | IRON HORSE MIDSTREAM LLC / REMINGTON COMPRESSOR STATION | MINCO, Grady, OK | Pass | State |
| 2025-08-28 | BCE MACH II LLC / YELLOW WOLF 2H 19 PAD | REYDON, Roger Mills, OK | Pass | State |
| 2025-08-28 | INTERNATIONAL PAPER | SPRINGFIELD, Lane, OR | Pass | Local |
| 2025-08-28 | COLUMBIA GAS TRANS LLC/EAGLE | CHESTER SPRINGS, Chester, PA | Pass | State |
| 2025-08-28 | SONNEBORN INC/PETROLIA PLT | PETROLIA, Butler, PA | Pass | State |
| 2025-08-28 | RAUSCH CREEK GENERATION LLC/FRAILEY TWP — high-priority violation on file | TREMONT, Schuylkill, PA | Pass | State |
| 2025-08-28 | ESAB WELDING & CUTTING PROD/HANOVER | HANOVER, York, PA | Pass | State |
| 2025-08-28 | REGENCY MARCELLUS GAS GATHERING LLC/BOBST MOUNTAIN COMP STA | COGAN STA, Lycoming, PA | Pass | State |
| 2025-08-28 | ETC NORTHEAST FLD SVC LLC/PIKE COMP STA | ROCHESTER, Beaver, PA | Pass | State |
| 2025-08-28 | URQUHART STATION | BEECH ISLAND, Aiken, SC | Pass | State |
| 2025-08-28 | NORTHEAST LANDFILL LLC | EASTOVER, Richland, SC | Pass | State |
| 2025-08-28 | MACTAC INC | MOORE, Spartanburg, SC | Pass | State |
| 2025-08-28 | SIGNAL MOUNTAIN CEMENT COMPANY D/B/A BUZZI UNICEM USA | CHATTANOOGA, Hamilton, TN | Pass | Local |
| 2025-08-28 | ALLEN COMBINED CYCLE PLANT - TVA | MEMPHIS, Shelby, TN | Pass | Local |
| 2025-08-28 | PORT ARTHUR REFINERY — high-priority violation on file | PORT ARTHUR, Jefferson, TX | Pass | State |
| 2025-08-28 | PORT ARTHUR REFINERY — high-priority violation on file | PORT ARTHUR, Jefferson, TX | Pass | State |
| 2025-08-28 | PORT ARTHUR REFINERY — high-priority violation on file | PORT ARTHUR, Jefferson, TX | Pass | State |
| 2025-08-28 | PORT ARTHUR REFINERY — high-priority violation on file | PORT ARTHUR, Jefferson, TX | Pass | State |
| 2025-08-28 | PORT ARTHUR REFINERY — high-priority violation on file | PORT ARTHUR, Jefferson, TX | Pass | State |
| 2025-08-28 | INTERMOUNTAIN POWER SERVICE CORPORATION | DELTA, Millard, UT | Pass | State |
| 2025-08-28 | DOMINION/ODEC - CLOVER POWER STATION — high-priority violation on file | CLOVER, Halifax, VA | Pass | State |
| 2025-08-28 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Incomplete | State |
| 2025-08-28 | LARAMIE RIVER STATION (BASIN ELECTRIC POWER COOPERATIVE) — high-priority violation on file | WHEATLAND, Platte, WY | Pass | State |
| 2025-08-28 | LARAMIE RIVER STATION (BASIN ELECTRIC POWER COOPERATIVE) — high-priority violation on file | WHEATLAND, Platte, WY | Pass | State |
| 2025-08-28 | LARAMIE RIVER STATION (BASIN ELECTRIC POWER COOPERATIVE) — high-priority violation on file | WHEATLAND, Platte, WY | Pass | State |
| 2025-08-28 | LARAMIE RIVER STATION (BASIN ELECTRIC POWER COOPERATIVE) — high-priority violation on file | WHEATLAND, Platte, WY | Pass | State |
| 2025-08-28 | LARAMIE RIVER STATION (BASIN ELECTRIC POWER COOPERATIVE) — high-priority violation on file | WHEATLAND, Platte, WY | Pass | State |
| 2025-08-28 | LARAMIE RIVER STATION (BASIN ELECTRIC POWER COOPERATIVE) — high-priority violation on file | WHEATLAND, Platte, WY | Pass | State |
| 2025-08-28 | LARAMIE RIVER STATION (BASIN ELECTRIC POWER COOPERATIVE) — high-priority violation on file | WHEATLAND, Platte, WY | Pass | State |
| 2025-08-28 | LARAMIE RIVER STATION (BASIN ELECTRIC POWER COOPERATIVE) — high-priority violation on file | WHEATLAND, Platte, WY | Pass | State |
| 2025-08-28 | LARAMIE RIVER STATION (BASIN ELECTRIC POWER COOPERATIVE) — high-priority violation on file | WHEATLAND, Platte, WY | Pass | State |
| 2025-08-28 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-08-28 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-08-28 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-08-28 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-08-28 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-08-28 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-08-28 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-08-28 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-08-28 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-08-28 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-08-27 | FAIRBANKS GOLD MINING INC / FORT KNOX MINE | FAIRBANKS, Fairbanks North Star, AK | N/A | State |
| 2025-08-27 | FAIRBANKS GOLD MINING INC / FORT KNOX MINE | FAIRBANKS, Fairbanks North Star, AK | N/A | State |
| 2025-08-27 | FAIRBANKS GOLD MINING INC / FORT KNOX MINE | FAIRBANKS, Fairbanks North Star, AK | Pass | State |
| 2025-08-27 | FAIRBANKS GOLD MINING INC / FORT KNOX MINE | FAIRBANKS, Fairbanks North Star, AK | N/A | State |
| 2025-08-27 | FAIRBANKS GOLD MINING INC / FORT KNOX MINE | FAIRBANKS, Fairbanks North Star, AK | N/A | State |
| 2025-08-27 | FAIRBANKS GOLD MINING INC / FORT KNOX MINE | FAIRBANKS, Fairbanks North Star, AK | Pass | State |
| 2025-08-27 | FAIRBANKS GOLD MINING INC / FORT KNOX MINE | FAIRBANKS, Fairbanks North Star, AK | N/A | State |
| 2025-08-27 | WESTROCK COATED BOARD LLC-MAHRT MILL | PHENIX CITY, Russell, AL | Pass | State |
| 2025-08-27 | WESTROCK COATED BOARD LLC-MAHRT MILL | PHENIX CITY, Russell, AL | Pass | State |
| 2025-08-27 | CIRCLE K TERMINAL ALABAMA LLC (OLD BAMA TERMINAL) | BIRMINGHAM, Jefferson, AL | Pass | Local |
| 2025-08-27 | AMERICAN ELECTRIC POWER SERVICE CORPORATION (JOHN W. TURK JR. POWER PLANT) | FULTON, Hempstead, AR | Pass | State |
| 2025-08-27 | NUCOR COATINGS CORPORATION - BLYTHEVILLE PLANT | BLYTHEVILLE, Mississippi, AR | Pass | State |
| 2025-08-27 | NUCOR COATINGS CORPORATION - BLYTHEVILLE PLANT | BLYTHEVILLE, Mississippi, AR | Pass | State |
| 2025-08-27 | NUCOR COATINGS CORPORATION - BLYTHEVILLE PLANT | BLYTHEVILLE, Mississippi, AR | Incomplete | State |
| 2025-08-27 | NUCOR COATINGS CORPORATION - BLYTHEVILLE PLANT | BLYTHEVILLE, Mississippi, AR | Pass | State |
| 2025-08-27 | MID CONTINENT COAL & COKE COMPANY | BLYTHEVILLE, Mississippi, AR | Pass | State |
| 2025-08-27 | APACHE GENERATING STATION | COCHISE, Cochise, AZ | Pass | State |
| 2025-08-27 | LADW&P-HAYNES STEAM | LONG BEACH, Los Angeles, CA | Pass | Local |
| 2025-08-27 | LA CITY, DWP SCATTERGOOD GENERATING STN | PLAYA DEL REY, Los Angeles, CA | Pass | Local |
| 2025-08-27 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-08-27 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-08-27 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-08-27 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-08-27 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-08-27 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-08-27 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-08-27 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-08-27 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-08-27 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-08-27 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-08-27 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-08-27 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-08-27 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-08-27 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-08-27 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-08-27 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-08-27 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-08-27 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-08-27 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-08-27 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-08-27 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-08-27 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-08-27 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-08-27 | CRESTONE PEAK - CROW 3-64 29-30 | AURORA, Adams, CO | Pass | State |
| 2025-08-27 | CEMEX CONSTRUCTION MATERIALS - LYONS — high-priority violation on file | LYONS AREA, Boulder, CO | Pass | State |
| 2025-08-27 | CEMEX CONSTRUCTION MATERIALS - LYONS — high-priority violation on file | LYONS AREA, Boulder, CO | Pass | State |
| 2025-08-27 | CEMEX CONSTRUCTION MATERIALS - LYONS — high-priority violation on file | LYONS AREA, Boulder, CO | Pass | State |
| 2025-08-27 | TEP ROCKY MTN - WEBSTER CS | RIFLE 2.0 MI. W OF, Garfield, CO | Pass | State |
| 2025-08-27 | HAWK ROAD ENERGY FACILITY | FRANKLIN, Heard, GA | Pass | State |
| 2025-08-27 | CLEARWATER PAPER CORPORATION - AUGUSTA MILL — high-priority violation on file | AUGUSTA, Richmond, GA | Pass | State |
| 2025-08-27 | CLEARWATER PAPER CORPORATION - AUGUSTA MILL — high-priority violation on file | AUGUSTA, Richmond, GA | Pass | State |
| 2025-08-27 | POET BIOREFINING CORNING — high-priority violation on file | CORNING, Adams, IA | Pass | State |
| 2025-08-27 | NATURAL GAS PIPELINE CO OF AMERICA-#107 | EMERSON, Mills, IA | Pass | State |
| 2025-08-27 | NATURAL GAS PIPELINE CO OF AMERICA-#107 | EMERSON, Mills, IA | Pass | State |
| 2025-08-27 | ARCHER DANIELS MIDLAND COMPANY — high-priority violation on file | FRANKFORT, Clinton, IN | Pass | State |
| 2025-08-27 | ARCHER DANIELS MIDLAND COMPANY — high-priority violation on file | FRANKFORT, Clinton, IN | Pass | State |
| 2025-08-27 | ARCHER DANIELS MIDLAND COMPANY — high-priority violation on file | FRANKFORT, Clinton, IN | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.