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 |
|---|---|---|---|---|
| 2026-06-10 | ADVANCED BEARING MATERIALS LLC | GREENSBURG, Decatur, IN | Pass | State |
| 2026-06-10 | GARFIELD FACILITY LLC — high-priority violation on file | MUNCIE, Delaware, IN | Pass | State |
| 2026-06-10 | GARFIELD FACILITY LLC — high-priority violation on file | MUNCIE, Delaware, IN | Pass | State |
| 2026-06-10 | GARFIELD FACILITY LLC — high-priority violation on file | MUNCIE, Delaware, IN | Pass | State |
| 2026-06-10 | GARFIELD FACILITY LLC — high-priority violation on file | MUNCIE, Delaware, IN | Pass | State |
| 2026-06-10 | KINGSBURY CASTINGS DIVISION | KINGSBURY, LaPorte, IN | Pass | State |
| 2026-06-10 | KINGSBURY CASTINGS DIVISION | KINGSBURY, LaPorte, IN | Pass | State |
| 2026-06-10 | KINGSBURY CASTINGS DIVISION | KINGSBURY, LaPorte, IN | Pass | State |
| 2026-06-10 | KINGSBURY CASTINGS DIVISION | KINGSBURY, LaPorte, IN | Pass | State |
| 2026-06-10 | WAUPACA FOUNDRY INC PLANT 5 — high-priority violation on file | TELL CITY, Perry, IN | Pass | State |
| 2026-06-10 | WAUPACA FOUNDRY INC PLANT 5 — high-priority violation on file | TELL CITY, Perry, IN | Pass | State |
| 2026-06-10 | TENNESSEE GAS PIPELINE STATION 261 | AGAWAM, Hampden, MA | Pending | State |
| 2026-06-10 | DTE ELECTRIC COMPANY - WILMOT PEAKING FACILITY | KINGSTON, Tuscola, MI | Pass | State |
| 2026-06-10 | GRAYLING GENERATING STATION LTD PARTNER | GRAYLING, Crawford, MI | Pass | State |
| 2026-06-10 | CONSUMERS ENERGY CO. - ZEELAND GENERATING STATION | ZEELAND, Ottawa, MI | Pass | State |
| 2026-06-10 | CHEMOURS COMPANY - FAYETTEVILLE WORKS | FAYETTEVILLE, Bladen, NC | Pending | State |
| 2026-06-10 | BARNHILL CONTRACTING COMPANY - ROCKY MOUNT PLANT | ROCKY MOUNT, Edgecombe, NC | Pending | State |
| 2026-06-10 | LHOIST NORTH AMERICA OF ARIZONA - APEX PLANT — high-priority violation on file | LAS VEGAS, Clark, NV | Pass | Local |
| 2026-06-10 | BLUE RACER MIDSTREAM LLC - HFS#3 (ATHENS B) | NEW ATHENS, Harrison, OH | Pass | State |
| 2026-06-10 | BLUE RACER MIDSTREAM LLC - HFS#3 (ATHENS B) | NEW ATHENS, Harrison, OH | Pass | State |
| 2026-06-10 | BLUE RACER MIDSTREAM LLC - HFS#3 (ATHENS B) | NEW ATHENS, Harrison, OH | Pass | State |
| 2026-06-10 | GULFPORT APPALACHIA, LLC - SCHUMACHER WELL PAD | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-06-10 | GULFPORT APPALACHIA, LLC - SCHUMACHER WELL PAD | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-06-10 | GULFPORT APPALACHIA, LLC - SCHUMACHER WELL PAD | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-06-10 | GULFPORT APPALACHIA, LLC - MORRIS PAD | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-06-10 | GULFPORT APPALACHIA, LLC - MORRIS PAD | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-06-10 | GULFPORT APPALACHIA, LLC - MORRIS PAD | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-06-10 | NOVELIS ALR RECYCLING OF OHIO LLC — high-priority violation on file | UHRICHSVILLE, Tuscarawas, OH | Pass | State |
| 2026-06-10 | NOVELIS ALR RECYCLING OF OHIO LLC — high-priority violation on file | UHRICHSVILLE, Tuscarawas, OH | Pass | State |
| 2026-06-10 | NOVELIS ALR RECYCLING OF OHIO LLC — high-priority violation on file | UHRICHSVILLE, Tuscarawas, OH | Pass | State |
| 2026-06-10 | HEIDELBERG MATERIALS US CEMENT LLC/NAZARETH | NAZARETH, Northampton, PA | Pass | State |
| 2026-06-10 | CONSOL PA COAL CO LLC/BAILEY PREP PLT — high-priority violation on file | WEST FINLEY, Greene, PA | Pending | State |
| 2026-06-10 | PEOPLES NATURAL GAS CO LLC/BELKNAP COMP STA | DAYTON, Armstrong, PA | Pass | State |
| 2026-06-10 | EQM GATHERING OPCO LLC/CALLISTO COMP STA | SYCAMORE, Greene, PA | Pass | State |
| 2026-06-10 | EXPAND OPERATING LLC/MARCUCCI JONES PAD | STEVENSVILLE, Bradford, PA | Pass | State |
| 2026-06-10 | BLACKHILL ENERGY LLC/YOUNG COMP STA — high-priority violation on file | COLUMBIA CROSS ROADS, Bradford, PA | Pass | State |
| 2026-06-10 | HORRY COUNTY SOLID WASTE AUTHORITY INC | CONWAY, Horry, SC | Pass | State |
| 2026-06-10 | DOMTAR PAPER COMPANY LLC | BENNETTSVILLE, Marlboro, SC | Fail | State |
| 2026-06-10 | C.R. JACKSON, INC. - WOODFORD ASPHALT PLANT #402 | NORTH, Lexington, SC | Pass | State |
| 2026-06-10 | TENNESSEE GAS PIPELINE COMPANY, LLC | NUNNELLY, Hickman, TN | Pass | State |
| 2026-06-10 | WPL-SOUTH FOND DU LAC COMBUSTION TURBINE SITE | FOND DU LAC, Fond du Lac, WI | Pass | State |
| 2026-06-10 | MORGAN DRAW/CRENSHAW HILL (PRONGHORN MIDSTREAM LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-06-10 | MORGAN DRAW/CRENSHAW HILL (PRONGHORN MIDSTREAM LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-06-10 | MORGAN DRAW/CRENSHAW HILL (PRONGHORN MIDSTREAM LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-06-10 | MORGAN DRAW/CRENSHAW HILL (PRONGHORN MIDSTREAM LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-06-10 | MORGAN DRAW/CRENSHAW HILL (PRONGHORN MIDSTREAM LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-06-10 | MORGAN DRAW/CRENSHAW HILL (PRONGHORN MIDSTREAM LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-06-10 | ROCK SPRINGS FERTILIZER COMPLEX (SIMPLOT PHOSPHATES) | ROCK SPRINGS, Sweetwater, WY | Pass | State |
| 2026-06-10 | ROCK SPRINGS FERTILIZER COMPLEX (SIMPLOT PHOSPHATES) | ROCK SPRINGS, Sweetwater, WY | Pass | State |
| 2026-06-09 | HUNTSVILLE SOLID WASTE DISPOSAL AUTHORIT | HUNTSVILLE, Madison, AL | Pass | State |
| 2026-06-09 | HUNT REFINING COMPANY | TUSCALOOSA, Tuscaloosa, AL | Pass | State |
| 2026-06-09 | 3M COMPANY - 3M INDUSTRIAL MINERAL PRODUCTS DIVISION | LITTLE ROCK, Pulaski, AR | Pass | State |
| 2026-06-09 | 3M COMPANY - 3M INDUSTRIAL MINERAL PRODUCTS DIVISION | LITTLE ROCK, Pulaski, AR | Pass | State |
| 2026-06-09 | 3M COMPANY - 3M INDUSTRIAL MINERAL PRODUCTS DIVISION | LITTLE ROCK, Pulaski, AR | Pass | State |
| 2026-06-09 | 3M COMPANY - 3M INDUSTRIAL MINERAL PRODUCTS DIVISION | LITTLE ROCK, Pulaski, AR | Pass | State |
| 2026-06-09 | 3M COMPANY - 3M INDUSTRIAL MINERAL PRODUCTS DIVISION | LITTLE ROCK, Pulaski, AR | Pass | State |
| 2026-06-09 | 3M COMPANY - 3M INDUSTRIAL MINERAL PRODUCTS DIVISION | LITTLE ROCK, Pulaski, AR | Pass | State |
| 2026-06-09 | 3M COMPANY - 3M INDUSTRIAL MINERAL PRODUCTS DIVISION | LITTLE ROCK, Pulaski, AR | Pass | State |
| 2026-06-09 | 3M COMPANY - 3M INDUSTRIAL MINERAL PRODUCTS DIVISION | LITTLE ROCK, Pulaski, AR | Pass | State |
| 2026-06-09 | DESOTO GATHERING COMPANY, LLC - TIGER CPF 2 | JUDSONIA, White, AR | Pass | State |
| 2026-06-09 | CORONADO GENERATING PLANT | SAINT JOHNS, Apache, AZ | Pass | State |
| 2026-06-09 | APACHE GENERATING STATION | COCHISE, Cochise, AZ | Pass | State |
| 2026-06-09 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-09 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-09 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-09 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-09 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-09 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-09 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-09 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-09 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-09 | BLACK HILLS ELECTRIC GENERATION - PAGS | PUEBLO, Pueblo, CO | Pass | State |
| 2026-06-09 | BLACK HILLS ELECTRIC GENERATION - PAGS | PUEBLO, Pueblo, CO | Pass | State |
| 2026-06-09 | PDC ENERGY, INC - LAWERENCE 33 SEC HZ | EATON AREA, Weld, CO | Pass | State |
| 2026-06-09 | HARTFORD WATER POLLUTION CONTROL FACILITY — high-priority violation on file | HARTFORD, Hartford, CT | Pending | U.S. EPA |
| 2026-06-09 | NASA KENNEDY SPACE CENTER | JOHN F KENNEDY SPACE CENTER, Brevard, FL | Pass | State |
| 2026-06-09 | FLORIDA GAS TRANSMISSION COMPANY, LLC | QUINCY, Gadsden, FL | Pass | State |
| 2026-06-09 | FLORIDA GAS TRANSMISSION COMPANY, LLC | QUINCY, Gadsden, FL | Pass | State |
| 2026-06-09 | FLORIDA GAS TRANSMISSION COMPANY, LLC | QUINCY, Gadsden, FL | Pass | State |
| 2026-06-09 | FLORIDA GAS TRANSMISSION COMPANY, LLC | QUINCY, Gadsden, FL | Pass | State |
| 2026-06-09 | FLORIDA GAS TRANSMISSION COMPANY, LLC | QUINCY, Gadsden, FL | Pass | State |
| 2026-06-09 | FLORIDA GAS TRANSMISSION COMPANY, LLC | QUINCY, Gadsden, FL | Pass | State |
| 2026-06-09 | SEMINOLE ELECTRIC COOPERATIVE, INC. | BOWLING GREEN, Hardee, FL | Pass | State |
| 2026-06-09 | SEMINOLE ELECTRIC COOPERATIVE, INC. | BOWLING GREEN, Hardee, FL | Pass | State |
| 2026-06-09 | MAS GEORGIA LFG, LLC (OAK GROVE) | WINDER, Barrow, GA | Pass | State |
| 2026-06-09 | MAS GEORGIA LFG, LLC (OAK GROVE) | WINDER, Barrow, GA | Pass | State |
| 2026-06-09 | MAS GEORGIA LFG, LLC (OAK GROVE) | WINDER, Barrow, GA | Pass | State |
| 2026-06-09 | JOHNSON MATTHEY PROCESS TECHNOLOGIES, INC | SAVANNAH, Chatham, GA | Pass | State |
| 2026-06-09 | JOHNSON MATTHEY PROCESS TECHNOLOGIES, INC | SAVANNAH, Chatham, GA | Pass | State |
| 2026-06-09 | SABAL TRAIL TRANSMISSION, LLC - ALBANY COMPRESSOR STATION | ALBANY, Dougherty, GA | Pass | State |
| 2026-06-09 | SABAL TRAIL TRANSMISSION, LLC - ALBANY COMPRESSOR STATION | ALBANY, Dougherty, GA | Pass | State |
| 2026-06-09 | SABAL TRAIL TRANSMISSION, LLC - ALBANY COMPRESSOR STATION | ALBANY, Dougherty, GA | Pass | State |
| 2026-06-09 | SABAL TRAIL TRANSMISSION, LLC - ALBANY COMPRESSOR STATION | ALBANY, Dougherty, GA | Pass | State |
| 2026-06-09 | SABAL TRAIL TRANSMISSION, LLC - ALBANY COMPRESSOR STATION | ALBANY, Dougherty, GA | Pass | State |
| 2026-06-09 | THOMAS A. SMITH ENERGY FACILITY | DALTON, Murray, GA | Pass | State |
| 2026-06-09 | THOMAS A. SMITH ENERGY FACILITY | DALTON, Murray, GA | Pass | State |
| 2026-06-09 | INTERFOR U.S. INC. - THOMASTON MILL — high-priority violation on file | THOMASTON, Upson, GA | Pass | State |
| 2026-06-09 | INTERFOR U.S. INC. - THOMASTON MILL — high-priority violation on file | THOMASTON, Upson, GA | Pass | State |
| 2026-06-09 | INTERFOR U.S. INC. - THOMASTON MILL — high-priority violation on file | THOMASTON, Upson, GA | Pass | State |
| 2026-06-09 | INTERFOR U.S. INC. - THOMASTON MILL — high-priority violation on file | THOMASTON, Upson, GA | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.