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 |
|---|---|---|---|---|
| 2026-05-11 | WPL - RIVERSIDE ENERGY CENTER | BELOIT, Rusk, WI | Pass | State |
| 2026-05-11 | COLONY PLANT (BENTONITE PERFORMANCE MINERALS) | COLONY, Crook, WY | Pass | State |
| 2026-05-11 | WESTVACO FACILITY (WE SODA WYOMING LP) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-05-11 | WESTVACO FACILITY (WE SODA WYOMING LP) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-05-10 | PINELLAS CO. BOARD OF CO. COMMISSIONERS | SAINT PETERSBURG, Pinellas, FL | Pass | State |
| 2026-05-10 | PINELLAS CO. BOARD OF CO. COMMISSIONERS | SAINT PETERSBURG, Pinellas, FL | Pass | State |
| 2026-05-10 | PINELLAS CO. BOARD OF CO. COMMISSIONERS | SAINT PETERSBURG, Pinellas, FL | Pass | State |
| 2026-05-10 | PINELLAS CO. BOARD OF CO. COMMISSIONERS | SAINT PETERSBURG, Pinellas, FL | Pass | State |
| 2026-05-09 | JBS SOUDERTON INC/ALLENTOWN RD | SOUDERTON, Montgomery, PA | Pass | State |
| 2026-05-08 | 3M COMPANY - 3M INDUSTRIAL MINERAL PRODUCTS DIVISION | LITTLE ROCK, Pulaski, AR | Pass | State |
| 2026-05-08 | 3M COMPANY - 3M INDUSTRIAL MINERAL PRODUCTS DIVISION | LITTLE ROCK, Pulaski, AR | Pass | State |
| 2026-05-08 | 3M COMPANY - 3M INDUSTRIAL MINERAL PRODUCTS DIVISION | LITTLE ROCK, Pulaski, AR | Pass | State |
| 2026-05-08 | 3M COMPANY - 3M INDUSTRIAL MINERAL PRODUCTS DIVISION | LITTLE ROCK, Pulaski, AR | Pass | State |
| 2026-05-08 | 3M COMPANY - 3M INDUSTRIAL MINERAL PRODUCTS DIVISION | LITTLE ROCK, Pulaski, AR | Pass | State |
| 2026-05-08 | 3M COMPANY - 3M INDUSTRIAL MINERAL PRODUCTS DIVISION | LITTLE ROCK, Pulaski, AR | Pass | State |
| 2026-05-08 | 3M COMPANY - 3M INDUSTRIAL MINERAL PRODUCTS DIVISION | LITTLE ROCK, Pulaski, AR | Pass | State |
| 2026-05-08 | 3M COMPANY - 3M INDUSTRIAL MINERAL PRODUCTS DIVISION | LITTLE ROCK, Pulaski, AR | Pass | State |
| 2026-05-08 | 3M COMPANY - 3M INDUSTRIAL MINERAL PRODUCTS DIVISION | LITTLE ROCK, Pulaski, AR | Pass | State |
| 2026-05-08 | 3M COMPANY - 3M INDUSTRIAL MINERAL PRODUCTS DIVISION | LITTLE ROCK, Pulaski, AR | Pass | State |
| 2026-05-08 | 3M COMPANY - 3M INDUSTRIAL MINERAL PRODUCTS DIVISION | LITTLE ROCK, Pulaski, AR | Pass | State |
| 2026-05-08 | 3M COMPANY - 3M INDUSTRIAL MINERAL PRODUCTS DIVISION | LITTLE ROCK, Pulaski, AR | Pass | State |
| 2026-05-08 | 3M COMPANY - 3M INDUSTRIAL MINERAL PRODUCTS DIVISION | LITTLE ROCK, Pulaski, AR | Pass | State |
| 2026-05-08 | 3M COMPANY - 3M INDUSTRIAL MINERAL PRODUCTS DIVISION | LITTLE ROCK, Pulaski, AR | Pass | State |
| 2026-05-08 | 3M COMPANY - 3M INDUSTRIAL MINERAL PRODUCTS DIVISION | LITTLE ROCK, Pulaski, AR | Pass | State |
| 2026-05-08 | 3M COMPANY - 3M INDUSTRIAL MINERAL PRODUCTS DIVISION | LITTLE ROCK, Pulaski, AR | Pass | State |
| 2026-05-08 | 3M COMPANY - 3M INDUSTRIAL MINERAL PRODUCTS DIVISION | LITTLE ROCK, Pulaski, AR | Pass | State |
| 2026-05-08 | 3M COMPANY - 3M INDUSTRIAL MINERAL PRODUCTS DIVISION | LITTLE ROCK, Pulaski, AR | Pass | State |
| 2026-05-08 | 3M COMPANY - 3M INDUSTRIAL MINERAL PRODUCTS DIVISION | LITTLE ROCK, Pulaski, AR | Pass | State |
| 2026-05-08 | 3M COMPANY - 3M INDUSTRIAL MINERAL PRODUCTS DIVISION | LITTLE ROCK, Pulaski, AR | Pass | State |
| 2026-05-08 | 3M COMPANY - 3M INDUSTRIAL MINERAL PRODUCTS DIVISION | LITTLE ROCK, Pulaski, AR | Pass | State |
| 2026-05-08 | MESQUITE GENERATING STATION | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2026-05-08 | MOUNT VERNON MILLS | TRION, Chattooga, GA | Pass | State |
| 2026-05-08 | MOUNT VERNON MILLS | TRION, Chattooga, GA | Pass | State |
| 2026-05-08 | STERILIZATION SERVICES OF GEORGIA | ATLANTA, Fulton, GA | Pass | State |
| 2026-05-08 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | IOWA FALLS, Hardin, IA | Pass | State |
| 2026-05-08 | MAQUOKETA MUNICIPAL ELECTRIC UTILITY-N&S | MAQUOKETA (HISTORICAL), Jackson, IA | Pass | State |
| 2026-05-08 | MAQUOKETA MUNICIPAL ELECTRIC UTILITY-N&S | MAQUOKETA (HISTORICAL), Jackson, IA | Pass | State |
| 2026-05-08 | CONSUMERS ENERGY - FREEDOM COMPRESSOR STATION | MANCHESTER, Washtenaw, MI | Pass | State |
| 2026-05-08 | WILLISTON BASIN - CABIN CREEK | BAKER, Fallon, MT | Pass | State |
| 2026-05-08 | TARGA BADLANDS, LLC - LITTLE MISSOURI GAS PLANT (LMGP) AND SMOKEY COMPRESSOR STA | WATFORD CITY, McKenzie, ND | N/A | State |
| 2026-05-08 | BILL WILSHUSEN TB | LA HUERTA, Eddy, NM | Pass | State |
| 2026-05-08 | BILL WILSHUSEN TB | LA HUERTA, Eddy, NM | Pass | State |
| 2026-05-08 | HOLLYWOOD STAR CTB | CARLSBAD, Eddy, NM | Pass | State |
| 2026-05-08 | EOG RESOURCES, INC. - ECKLEY CR CEN PAD | CARROLLTON, Carroll, OH | Pass | State |
| 2026-05-08 | EOG RESOURCES, INC. - ECKLEY CR CEN PAD | CARROLLTON, Carroll, OH | Pass | State |
| 2026-05-08 | EOG RESOURCES, INC. - ECKLEY CR CEN PAD | CARROLLTON, Carroll, OH | Pass | State |
| 2026-05-08 | EOG RESOURCES, INC. - NORRIS CL WES PAD | EAST ROCHESTER, Columbiana, OH | Pass | State |
| 2026-05-08 | EOG RESOURCES, INC. - NORRIS CL WES PAD | EAST ROCHESTER, Columbiana, OH | Pass | State |
| 2026-05-08 | EOG RESOURCES, INC. - NORRIS CL WES PAD | EAST ROCHESTER, Columbiana, OH | Pass | State |
| 2026-05-08 | ROCKIES EXPRESS PIPELINE LLC- CHANDLERSVILLE CS | PHILO, Muskingum, OH | Pass | State |
| 2026-05-08 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-05-08 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-05-08 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-05-08 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-05-08 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-05-08 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-05-08 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-05-08 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-05-07 | ROBERT'S TRUST COMPRESSOR STATION | DUNN COUNTY, Dunn, ND | Pass | U.S. EPA |
| 2026-05-07 | ROBERT'S TRUST COMPRESSOR STATION | DUNN COUNTY, Dunn, ND | Pass | U.S. EPA |
| 2026-05-07 | OUTOKUMPU STAINLESS USA, LLC | CALVERT, Mobile, AL | Pass | State |
| 2026-05-07 | LHOIST NORTH AMERICA OF ALABAMA, LLC | CALERA, Shelby, AL | Pass | State |
| 2026-05-07 | LHOIST NORTH AMERICA OF ALABAMA, LLC | CALERA, Shelby, AL | Pass | State |
| 2026-05-07 | GRAYSON LUMBER CORPORATION | HOUSTON, Winston, AL | Pass | State |
| 2026-05-07 | GRAYSON LUMBER CORPORATION | HOUSTON, Winston, AL | Pass | State |
| 2026-05-07 | TOYOTA MOTORS MANUFACTURING OF AL, INC. | HUNTSVILLE, Madison, AL | Pass | Local |
| 2026-05-07 | DESOTO GATHERING COMPANY LLC - SOUTH BROWNIE CPF 2 | HATTIEVILLE, Conway, AR | Pass | State |
| 2026-05-07 | DESOTO GATHERING COMPANY LLC - PIKE CPF-1 | HATTIEVILLE, Conway, AR | Pass | State |
| 2026-05-07 | ENABLE MRT, LLC - GLENDALE COMPRESSOR STATION | STAR CITY, Lincoln, AR | Pass | State |
| 2026-05-07 | NUCOR YAMATO STEEL COMPANY | BLYTHEVILLE, Mississippi, AR | Pass | State |
| 2026-05-07 | TSMC PHOENIX PROJECT | MARICOPA COUNTY, Maricopa, AZ | Pending | Local |
| 2026-05-07 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | CARSON, Los Angeles, CA | Pass | Local |
| 2026-05-07 | FORWARD INC. LANDFILL — high-priority violation on file | MANTECA, San Joaquin, CA | Pass | Local |
| 2026-05-07 | FORWARD INC. LANDFILL — high-priority violation on file | MANTECA, San Joaquin, CA | Pass | Local |
| 2026-05-07 | FORWARD INC. LANDFILL — high-priority violation on file | MANTECA, San Joaquin, CA | Pass | Local |
| 2026-05-07 | FORWARD INC. LANDFILL — high-priority violation on file | MANTECA, San Joaquin, CA | Pass | Local |
| 2026-05-07 | FORWARD INC. LANDFILL — high-priority violation on file | MANTECA, San Joaquin, CA | Pass | Local |
| 2026-05-07 | FORWARD INC. LANDFILL — high-priority violation on file | MANTECA, San Joaquin, CA | Pass | Local |
| 2026-05-07 | FORWARD INC. LANDFILL — high-priority violation on file | MANTECA, San Joaquin, CA | Pass | Local |
| 2026-05-07 | GEORGE WASHINGTON UNIVERSITY — high-priority violation on file | WASHINGTON, District of Columbia, DC | Incomplete | State |
| 2026-05-07 | DUPONT EXPERIMENTAL STATION | WILMINGTON, New Castle, DE | Pass | State |
| 2026-05-07 | DUPONT EXPERIMENTAL STATION | WILMINGTON, New Castle, DE | Pass | State |
| 2026-05-07 | DUPONT EXPERIMENTAL STATION | WILMINGTON, New Castle, DE | Pass | State |
| 2026-05-07 | CEMEX CONSTRUCTION MATERIALS FLORIDA,LLC | BROOKSVILLE, Hernando, FL | Pass | State |
| 2026-05-07 | CEMEX CONSTRUCTION MATERIALS FLORIDA,LLC | BROOKSVILLE, Hernando, FL | Pass | State |
| 2026-05-07 | ORLANDO UTILITIES COMMISSION | ORLANDO, Orange, FL | Pass | State |
| 2026-05-07 | PASCO COUNTY | SHADY HILLS, Pasco, FL | Pass | State |
| 2026-05-07 | PASCO COUNTY | SHADY HILLS, Pasco, FL | Pass | State |
| 2026-05-07 | PASCO COUNTY | SHADY HILLS, Pasco, FL | Pass | State |
| 2026-05-07 | PASCO COUNTY | SHADY HILLS, Pasco, FL | Pass | State |
| 2026-05-07 | PASCO COUNTY | SHADY HILLS, Pasco, FL | Pass | State |
| 2026-05-07 | PASCO COUNTY | SHADY HILLS, Pasco, FL | Pass | State |
| 2026-05-07 | PASCO COUNTY | SHADY HILLS, Pasco, FL | Pass | State |
| 2026-05-07 | PASCO COUNTY | SHADY HILLS, Pasco, FL | Pass | State |
| 2026-05-07 | PASCO COUNTY | SHADY HILLS, Pasco, FL | Pass | State |
| 2026-05-07 | MARINE CORPS LOGISTICS BASE | ALBANY, Dougherty, GA | Pass | State |
| 2026-05-07 | MARINE CORPS LOGISTICS BASE | ALBANY, Dougherty, GA | Pass | State |
| 2026-05-07 | MARINE CORPS LOGISTICS BASE | ALBANY, Dougherty, GA | Pass | State |
| 2026-05-07 | STERILIZATION SERVICES OF GEORGIA | ATLANTA, Fulton, GA | Pass | State |
| 2026-05-07 | STERILIZATION SERVICES OF GEORGIA | ATLANTA, Fulton, GA | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.