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 |
|---|---|---|---|---|
| 2026-07-21 | WE ENERGIES-OAK CREEK POWER PLANT — high-priority violation on file | OAK CREEK, Monroe, WI | Pass | State |
| 2026-07-21 | OPAL GAS PLANT (WILLIAMS FIELD SERVICES) | OPAL, Lincoln, WY | Pass | State |
| 2026-07-21 | OPAL GAS PLANT (WILLIAMS FIELD SERVICES) | OPAL, Lincoln, WY | Pass | State |
| 2026-07-21 | OPAL GAS PLANT (WILLIAMS FIELD SERVICES) | OPAL, Lincoln, WY | Pass | State |
| 2026-07-20 | TARGA BADLANDS JUNCTION COMPRESSOR STATION | MCKENZIE COUNTY, McKenzie, ND | Pass | U.S. EPA |
| 2026-07-20 | TARGA BADLANDS JUNCTION COMPRESSOR STATION | MCKENZIE COUNTY, McKenzie, ND | Pass | U.S. EPA |
| 2026-07-20 | TARGA BADLANDS JUNCTION COMPRESSOR STATION | MCKENZIE COUNTY, McKenzie, ND | Pass | U.S. EPA |
| 2026-07-20 | BLUE BUTTES COMPRESSOR STATION AND PUMP STATION | MCKENZIE COUNTY, McKenzie, ND | Pass | U.S. EPA |
| 2026-07-20 | BLUE BUTTES COMPRESSOR STATION AND PUMP STATION | MCKENZIE COUNTY, McKenzie, ND | Pass | U.S. EPA |
| 2026-07-20 | BLUE BUTTES COMPRESSOR STATION AND PUMP STATION | MCKENZIE COUNTY, McKenzie, ND | Pass | U.S. EPA |
| 2026-07-20 | TAT-BLUE BUTTES COMPRESSOR STATION | MCKENZIE COUNTY, McKenzie, ND | Pass | U.S. EPA |
| 2026-07-20 | TAT-BLUE BUTTES COMPRESSOR STATION | MCKENZIE COUNTY, McKenzie, ND | Pass | U.S. EPA |
| 2026-07-20 | TAT-BLUE BUTTES COMPRESSOR STATION | MCKENZIE COUNTY, McKenzie, ND | Pass | U.S. EPA |
| 2026-07-20 | TAT-BLUE BUTTES COMPRESSOR STATION | MCKENZIE COUNTY, McKenzie, ND | Pass | U.S. EPA |
| 2026-07-20 | TAT-BLUE BUTTES COMPRESSOR STATION | MCKENZIE COUNTY, McKenzie, ND | Pass | U.S. EPA |
| 2026-07-20 | CALUMET MONTANA REFINING — high-priority violation on file | GREAT FALLS, Cascade, MT | Pass | State |
| 2026-07-20 | CALUMET MONTANA REFINING — high-priority violation on file | GREAT FALLS, Cascade, MT | Pass | State |
| 2026-07-20 | CALUMET MONTANA REFINING — high-priority violation on file | GREAT FALLS, Cascade, MT | Pass | State |
| 2026-07-20 | APC, INC. - SELMA | SELMA, Johnston, NC | Pending | State |
| 2026-07-20 | NPPD SHELDON STATION | HALLAM, Lancaster, NE | Pass | Local |
| 2026-07-20 | CABOT OIL & GAS CORP/JEFFERS FARMS PAD 5 | GIBSON, Susquehanna, PA | Pending | State |
| 2026-07-20 | CABOT OIL & GAS CORP/FOLTZ J PAD 1 | HOP BOTTOM, Susquehanna, PA | Pass | State |
| 2026-07-20 | REEVES CONSTRUCTION COMPANY - BLACKSBURG ASPHALT PLANT | BLACKSBURG, Cherokee, SC | Pass | State |
| 2026-07-19 | HILLTOP ENERGY CENTER LLC/CARMICHAELS | CARMICHAELS, Greene, PA | Pass | State |
| 2026-07-17 | LENZING FIBERS INC | AXIS, Mobile, AL | Pass | State |
| 2026-07-17 | LENZING FIBERS INC | AXIS, Mobile, AL | Pass | State |
| 2026-07-17 | AM/NS CALVERT LLC | CALVERT, Mobile, AL | Pass | State |
| 2026-07-17 | ITW GRAPHICS | MANCHESTER, Hartford, CT | Pending | State |
| 2026-07-17 | DUKE ENERGY FLORIDA, LLC | INTERCESSION CITY, Osceola, FL | Pass | State |
| 2026-07-17 | DUKE ENERGY FLORIDA, LLC | INTERCESSION CITY, Osceola, FL | Pass | State |
| 2026-07-17 | HK CONTRACTORS INC 00079 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2026-07-17 | HK CONTRACTORS INC 00121 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2026-07-17 | HK CONTRACTORS INC 00168 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2026-07-17 | HK CONTRACTORS 00413 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2026-07-17 | HK CONTRACTORS INC 00463 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2026-07-17 | HK CONTRACTORS INC 00480 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2026-07-17 | HK CONTRACTORS 00495 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2026-07-17 | BUTTERFIELD ROAD CCDD | NORTH AURORA, Kane, IL | Pass | State |
| 2026-07-17 | WABASH STEEL COMPANY LLC — high-priority violation on file | VINCENNES, Knox, IN | Pass | State |
| 2026-07-17 | WABASH STEEL COMPANY LLC — high-priority violation on file | VINCENNES, Knox, IN | Pass | State |
| 2026-07-17 | WABASH STEEL COMPANY LLC — high-priority violation on file | VINCENNES, Knox, IN | Pass | State |
| 2026-07-17 | WABASH STEEL COMPANY LLC — high-priority violation on file | VINCENNES, Knox, IN | Pass | State |
| 2026-07-17 | NUCOR STEEL LEXINGTON | LEXINGTON, Davidson, NC | Pending | State |
| 2026-07-17 | EOG RESOURCES, INC - INDIGO CTB | MALVERN, Carroll, OH | Pass | State |
| 2026-07-17 | EOG RESOURCES, INC - INDIGO CTB | MALVERN, Carroll, OH | Pass | State |
| 2026-07-17 | EOG RESOURCES, INC - INDIGO CTB | MALVERN, Carroll, OH | Pass | State |
| 2026-07-17 | PRECISION CAPITAL, LP PAD 1 | HOP BOTTOM, Susquehanna, PA | Pass | State |
| 2026-07-17 | US ARMY - RAAP — high-priority violation on file | RADFORD, Montgomery, VA | Pending | State |
| 2026-07-17 | ENVIVA SOUTHAMPTON | FRANKLIN, Southampton, VA | Pending | State |
| 2026-07-16 | ALABAMA POWER COMPANY (MILLER POWER PLANT) | QUINTON, Jefferson, AL | Pass | Local |
| 2026-07-16 | EMERY SAPP & SONS, INC. - GRAVETTE ASPHALT PLANT | SULPHUR SPRINGS, Benton, AR | Pass | State |
| 2026-07-16 | NRO - AEROSPACE DATA FACIITY (ADF-C) | AURORA, Arapahoe, CO | Pass | State |
| 2026-07-16 | ENTERPRISE GAS PROC - MEEKER GAS PLANT — high-priority violation on file | MEEKER 21.1 MI. W OF, Rio Blanco, CO | N/A | State |
| 2026-07-16 | GB II NEW HAVEN, LLC - NEW HAVEN HARBOR STATION | NEW HAVEN, New Haven, CT | Pending | State |
| 2026-07-16 | DUKE ENERGY FLORIDA, LLC | INTERCESSION CITY, Osceola, FL | Pass | State |
| 2026-07-16 | DUKE ENERGY FLORIDA, LLC | INTERCESSION CITY, Osceola, FL | Pass | State |
| 2026-07-16 | CLEARWATER PAPER CORP-PPD | LEWISTON, Nez Perce, ID | Pass | State |
| 2026-07-16 | SUNCORE CONSTRUCTION & MATERIALS 00552 | IDAHO FALLS, Bonneville, ID | Pending | State |
| 2026-07-16 | CARGILL INC — high-priority violation on file | HAMMOND, Lake, IN | Pass | State |
| 2026-07-16 | CARGILL INC — high-priority violation on file | HAMMOND, Lake, IN | Pass | State |
| 2026-07-16 | CARGILL INC — high-priority violation on file | HAMMOND, Lake, IN | Pass | State |
| 2026-07-16 | ARK VALLEY ELECTRIC CO-OP - ARLINGTON SUBSTATION (AIR) | ARLINGTON, Reno, KS | Pass | State |
| 2026-07-16 | DTE ELECTRIC COMPANY - MONROE POWER PLANT | MONROE, Monroe, MI | Pass | State |
| 2026-07-16 | CONSUMERS ENERGY - ST. CLAIR COMPRESSOR STATION | IRA, St. Clair, MI | Pass | State |
| 2026-07-16 | FSC II, LLC - KNIGHTDALE ASPHALT PLANT | KNIGHTDALE, Wake, NC | Pending | State |
| 2026-07-16 | NPPD SHELDON STATION | HALLAM, Lancaster, NE | Pass | Local |
| 2026-07-16 | MARKWEST TRI-COUNTY COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-07-16 | MARKWEST TRI-COUNTY COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-07-16 | MARKWEST TRI-COUNTY COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-07-16 | MARKWEST TRI-COUNTY COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-07-16 | MARKWEST TRI-COUNTY COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-07-16 | MARKWEST TRI-COUNTY COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-07-16 | MARKWEST TRI-COUNTY COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-07-16 | MARKWEST TRI-COUNTY COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-07-16 | MARKWEST TRI-COUNTY COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-07-16 | MARKWEST TRI-COUNTY COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-07-16 | MARKWEST TRI-COUNTY COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-07-16 | MARKWEST TRI-COUNTY COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-07-16 | MARKWEST TRI-COUNTY COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-07-16 | MARKWEST TRI-COUNTY COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-07-16 | MARKWEST TRI-COUNTY COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-07-16 | MARKWEST TRI-COUNTY COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-07-16 | MARKWEST TRI-COUNTY COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-07-16 | MARKWEST TRI-COUNTY COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-07-16 | EOG RESOURCES, INC. - E CLARK SOUTH CTB | TIPPECANOE, Harrison, OH | Pass | State |
| 2026-07-16 | EOG RESOURCES, INC. - E CLARK SOUTH CTB | TIPPECANOE, Harrison, OH | Pass | State |
| 2026-07-16 | EOG RESOURCES, INC. - E CLARK SOUTH CTB | TIPPECANOE, Harrison, OH | Pass | State |
| 2026-07-16 | EOG RESOURCES, INC. - BEARCATS NB BUF PAD | BUFFALO, TOWNSHIP OF, Noble, OH | Pass | State |
| 2026-07-16 | EOG RESOURCES, INC. - BEARCATS NB BUF PAD | BUFFALO, TOWNSHIP OF, Noble, OH | Pass | State |
| 2026-07-16 | EOG RESOURCES, INC. - BEARCATS NB BUF PAD | BUFFALO, TOWNSHIP OF, Noble, OH | Pass | State |
| 2026-07-16 | SOUTHERLY WASTEWATER TREATMENT CENTER | CUYAHOGA HEIGHTS, Cuyahoga, OH | Pass | State |
| 2026-07-16 | SOUTHERLY WASTEWATER TREATMENT CENTER | CUYAHOGA HEIGHTS, Cuyahoga, OH | Pass | State |
| 2026-07-16 | SOUTHERLY WASTEWATER TREATMENT CENTER | CUYAHOGA HEIGHTS, Cuyahoga, OH | Pass | State |
| 2026-07-16 | SOUTHERLY WASTEWATER TREATMENT CENTER | CUYAHOGA HEIGHTS, Cuyahoga, OH | Pass | State |
| 2026-07-16 | SOUTHERLY WASTEWATER TREATMENT CENTER | CUYAHOGA HEIGHTS, Cuyahoga, OH | Pass | State |
| 2026-07-16 | ENVIRONMENTAL AND MAINTENANCE SERVICE CENTER (EMSC) | CUYAHOGA HEIGHTS, Cuyahoga, OH | Pass | State |
| 2026-07-16 | NORTHUMBERLAND TERM DE LLC/NORTHUMBERLAND TERM | NORTHUMBERLAND, Northumberland, PA | Pass | State |
| 2026-07-16 | SUSQUEHANNA GATHERING/CDP 1 COMP STA | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2026-07-16 | CABOT OIL & GAS CORP/TEDDICK, M. PAD 1 | KINGSLEY, Susquehanna, PA | Pass | State |
| 2026-07-16 | A M WILLIAMS STATION | GOOSE CREEK, Berkeley, SC | Pending | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.
What this page shows
This page covers Clean Air Act facilities in the EPA air register with stack tests in 2026. It lists 11,110 stack tests recorded nationwide in 2026.