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 |
|---|---|---|---|---|
| 2026-03-03 | CAPITAL QUARRIES CO. INC (PORT-0931) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-03-03 | CAPITAL QUARRIES CO. INC (PORT-0931) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-03-03 | CAPITAL QUARRIES CO. INC (PORT-0931) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-03-03 | CAPITAL QUARRIES CO. INC (PORT-0931) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-03-03 | CAPITAL QUARRIES CO. INC (PORT-0931) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-03-03 | CAPITAL QUARRIES CO. INC (PORT-0931) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-03-03 | CAPITAL QUARRIES CO. INC (PORT-0931) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-03-03 | CAPITAL QUARRIES CO. INC (PORT-0931) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-03-03 | CAPITAL QUARRIES CO. INC (PORT-0931) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-03-03 | CAPITAL QUARRIES CO. INC (PORT-0931) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-03-03 | GCF US HOLDINGS LLC - NEW BERN MILL | VANCEBORO, Craven, NC | Pass | State |
| 2026-03-03 | DUKE ENERGY CORPORATION LCTS | STANLEY, Lincoln, NC | Pass | State |
| 2026-03-03 | SUNROCK INDUSTRIES LLC - RDU DISTRIBUTION CENTER | RALEIGH, Wake, NC | Pass | State |
| 2026-03-03 | ACE STERN VEGAS FACILITY | LOVING, Eddy, NM | Pass | State |
| 2026-03-03 | HF SINCLAIR NAVAJO REFINING LLC (LOVINGTON) | LOVINGTON, Lea, NM | Pass | State |
| 2026-03-03 | 3 BEAR LIBBY GAS PLANT | MONUMENT, Lea, NM | Pass | State |
| 2026-03-03 | MARK WEST - BELL LAKE SOUTH COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-03-03 | MARK WEST - BELL LAKE SOUTH COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-03-03 | MARK WEST - BELL LAKE SOUTH COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-03-03 | MARK WEST - BELL LAKE SOUTH COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-03-03 | NSG GLASS NORTH AMERICA, INC. — high-priority violation on file | LUCKEY, Wood, OH | Pass | State |
| 2026-03-03 | NSG GLASS NORTH AMERICA, INC. — high-priority violation on file | LUCKEY, Wood, OH | Pass | State |
| 2026-03-03 | NSG GLASS NORTH AMERICA, INC. — high-priority violation on file | LUCKEY, Wood, OH | Pass | State |
| 2026-03-03 | NSG GLASS NORTH AMERICA, INC. — high-priority violation on file | LUCKEY, Wood, OH | Pass | State |
| 2026-03-03 | NSG GLASS NORTH AMERICA, INC. — high-priority violation on file | LUCKEY, Wood, OH | Pass | State |
| 2026-03-03 | GULFPORT APPALACHIA, LLC - SCHUBERT WELL PAD | RAYLAND, Jefferson, OH | Pass | State |
| 2026-03-03 | GULFPORT APPALACHIA, LLC - SCHUBERT WELL PAD | RAYLAND, Jefferson, OH | Pass | State |
| 2026-03-03 | GULFPORT APPALACHIA, LLC - SCHUBERT WELL PAD | RAYLAND, Jefferson, OH | Pass | State |
| 2026-03-03 | ORMET 9 PAD 952729 | HANNIBAL, Monroe, OH | Pass | State |
| 2026-03-03 | ORMET 9 PAD 952729 | HANNIBAL, Monroe, OH | Pass | State |
| 2026-03-03 | ORMET 9 PAD 952729 | HANNIBAL, Monroe, OH | Pass | State |
| 2026-03-03 | ORMET 15 PAD 952728 | CLARINGTON, Monroe, OH | Pass | State |
| 2026-03-03 | ORMET 15 PAD 952728 | CLARINGTON, Monroe, OH | Pass | State |
| 2026-03-03 | ORMET 15 PAD 952728 | CLARINGTON, Monroe, OH | Pass | State |
| 2026-03-03 | EQM OLYMPUS MIDSTREAM, LLC - SWITZ 27 CS | CLARINGTON, Monroe, OH | Pass | State |
| 2026-03-03 | EQM OLYMPUS MIDSTREAM, LLC - SWITZ 27 CS | CLARINGTON, Monroe, OH | Pass | State |
| 2026-03-03 | EQM OLYMPUS MIDSTREAM, LLC - SWITZ 27 CS | CLARINGTON, Monroe, OH | Pass | State |
| 2026-03-03 | OHIO POWER PARTNERS, LLC | MIDDLETOWN, Butler, OH | Pass | State |
| 2026-03-03 | DART CONTAINER CORP/LEOLA | LEOLA, Lancaster, PA | Pass | State |
| 2026-03-03 | SCRUBGRASS GENERATING PLT/VENANGO — high-priority violation on file | KENNERDELL, Venango, PA | Pass | State |
| 2026-03-03 | HAYSITE REINFORCED PLASTICS LLC/ERIE — high-priority violation on file | ERIE, Erie, PA | Pass | State |
| 2026-03-03 | EQT ARO LLC/LARRYS CREEK COMP STA | JERSEY SHORE, Lycoming, PA | Pass | State |
| 2026-03-03 | NATL FUEL GAS SUPPLY CORP/MARVINDALE COMP STA | MOUNT JEWETT, McKean, PA | Pass | State |
| 2026-03-03 | HAIG POINT CLUB — high-priority violation on file | DAUFUSKIE ISLAND, Beaufort, SC | Pass | State |
| 2026-03-03 | DOMTAR PAPER COMPANY LLC | BENNETTSVILLE, Marlboro, SC | Pass | State |
| 2026-03-03 | TENNESSEE VALLEY AUTHORITY - CUMBERLAND FOSSIL PLANT — high-priority violation on file | CUMBERLAND CITY, Stewart, TN | Pass | State |
| 2026-03-03 | ANR PIPELINE CO COLLIERVILLE OF | MEMPHIS, Shelby, TN | Pass | Local |
| 2026-03-03 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2026-03-03 | PHILLIPS 66 | FERNDALE, Whatcom, WA | Pass | Local |
| 2026-03-03 | BP WEST COAST PRODUCTS LLC — high-priority violation on file | BLAINE, Whatcom, WA | Pass | Local |
| 2026-03-03 | GRAYMONT WESTERN LIME - EDEN | EDEN, Fond du Lac, WI | Pass | State |
| 2026-03-03 | UNITED ENERGY NECEDAH LLC — high-priority violation on file | NECEDAH, Juneau, WI | Pass | State |
| 2026-03-03 | OMNIS PLEASANTS, LLC, PLEASANTS POWER STATION | WILLOW ISLAND, Pleasants, WV | Pass | State |
| 2026-03-02 | DESOTO GATHERING COMPANY, LLC - GRAVEL HILL CPF-4 | SCOTLAND, Van Buren, AR | Pass | State |
| 2026-03-02 | DESOTO GATHERING COMPANY, LLC - GRAVEL HILL CPF-4 | SCOTLAND, Van Buren, AR | Pass | State |
| 2026-03-02 | BREVARD CO BOARD OF COUNTY COMMISSIONERS | COCOA, Brevard, FL | Pass | State |
| 2026-03-02 | ENVIROFOCUS TECHNOLOGIES DBA GOPHER RESO — high-priority violation on file | TAMPA, Hillsborough, FL | Pass | State |
| 2026-03-02 | ENVIROFOCUS TECHNOLOGIES DBA GOPHER RESO — high-priority violation on file | TAMPA, Hillsborough, FL | Pass | State |
| 2026-03-02 | ENVIROFOCUS TECHNOLOGIES DBA GOPHER RESO — high-priority violation on file | TAMPA, Hillsborough, FL | Pass | State |
| 2026-03-02 | ENVIROFOCUS TECHNOLOGIES DBA GOPHER RESO — high-priority violation on file | TAMPA, Hillsborough, FL | Pass | State |
| 2026-03-02 | BUNGE NORTH AMERICA EAST LLC | DECATUR, Adams, IN | Pass | State |
| 2026-03-02 | BUNGE NORTH AMERICA EAST LLC | DECATUR, Adams, IN | Pass | State |
| 2026-03-02 | BUNGE NORTH AMERICA EAST LLC | DECATUR, Adams, IN | Pass | State |
| 2026-03-02 | BUNGE NORTH AMERICA EAST LLC | DECATUR, Adams, IN | Pass | State |
| 2026-03-02 | BUNGE NORTH AMERICA EAST LLC | DECATUR, Adams, IN | Pass | State |
| 2026-03-02 | BUNGE NORTH AMERICA EAST LLC | DECATUR, Adams, IN | Pass | State |
| 2026-03-02 | BUNGE NORTH AMERICA EAST LLC | DECATUR, Adams, IN | Pass | State |
| 2026-03-02 | BUNGE NORTH AMERICA EAST LLC | DECATUR, Adams, IN | Pass | State |
| 2026-03-02 | PUBLIC WORKS COMMISSION BUTLER-WARNER GENERATION PLANT | FAYETTEVILLE, Cumberland, NC | Pending | State |
| 2026-03-02 | TARGA BADLANDS, LLC - LITTLE MISSOURI GAS PLANT (LMGP) AND SMOKEY COMPRESSOR STA | WATFORD CITY, McKenzie, ND | N/A | State |
| 2026-03-02 | MARK WEST - BELL LAKE SOUTH COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-03-02 | MARK WEST - BELL LAKE SOUTH COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-03-02 | MARK WEST - BELL LAKE SOUTH COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-03-02 | MARK WEST - BELL LAKE SOUTH COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-03-02 | 32-8 NO3 CENTRAL DELIVERY POINT | AZTEC, San Juan, NM | Pass | State |
| 2026-03-02 | KILGORE COMPRESSOR STATION-UTICA GAS SERVICES, LLC | KILGORE, Carroll, OH | Pass | State |
| 2026-03-02 | KILGORE COMPRESSOR STATION-UTICA GAS SERVICES, LLC | KILGORE, Carroll, OH | Pass | State |
| 2026-03-02 | KILGORE COMPRESSOR STATION-UTICA GAS SERVICES, LLC | KILGORE, Carroll, OH | Pass | State |
| 2026-03-02 | KILGORE COMPRESSOR STATION-UTICA GAS SERVICES, LLC | KILGORE, Carroll, OH | Pass | State |
| 2026-03-02 | KILGORE COMPRESSOR STATION-UTICA GAS SERVICES, LLC | KILGORE, Carroll, OH | Pass | State |
| 2026-03-02 | KILGORE COMPRESSOR STATION-UTICA GAS SERVICES, LLC | KILGORE, Carroll, OH | Pass | State |
| 2026-03-02 | KILGORE COMPRESSOR STATION-UTICA GAS SERVICES, LLC | KILGORE, Carroll, OH | Pass | State |
| 2026-03-02 | KILGORE COMPRESSOR STATION-UTICA GAS SERVICES, LLC | KILGORE, Carroll, OH | Pass | State |
| 2026-03-02 | KILGORE COMPRESSOR STATION-UTICA GAS SERVICES, LLC | KILGORE, Carroll, OH | Pass | State |
| 2026-03-02 | PROCTER & GAMBLE MASON BUSINESS & INNOVATION CENTER | MASON, Warren, OH | Pass | State |
| 2026-03-02 | LAUREL MTN MIDSTREAM OPR LLC/PRAH COMP STA | MCCLELLANDTOWN, Fayette, PA | Pass | State |
| 2026-03-02 | INR MIDSTREAM LLC/WEST SUMMIT COMP STA | LAKE LYNN, Fayette, PA | Pass | State |
| 2026-03-02 | PORT TOWNSEND PAPER CORPORATION — high-priority violation on file | PORT TOWNSEND, Jefferson, WA | Pass | State |
| 2026-02-28 | LEE COUNTY DEPT. OF SOLID WASTE MGT. | FORT MYERS, Lee, FL | Pass | State |
| 2026-02-28 | LEE COUNTY DEPT. OF SOLID WASTE MGT. | FORT MYERS, Lee, FL | Pass | State |
| 2026-02-28 | LEE COUNTY DEPT. OF SOLID WASTE MGT. | FORT MYERS, Lee, FL | Pass | State |
| 2026-02-28 | LEE COUNTY DEPT. OF SOLID WASTE MGT. | FORT MYERS, Lee, FL | Pass | State |
| 2026-02-28 | LEE COUNTY DEPT. OF SOLID WASTE MGT. | FORT MYERS, Lee, FL | Pass | State |
| 2026-02-28 | NLMK INDIANA — high-priority violation on file | PORTAGE, Porter, IN | Pass | State |
| 2026-02-28 | NLMK INDIANA — high-priority violation on file | PORTAGE, Porter, IN | Pass | State |
| 2026-02-28 | NLMK INDIANA — high-priority violation on file | PORTAGE, Porter, IN | Pass | State |
| 2026-02-28 | NLMK INDIANA — high-priority violation on file | PORTAGE, Porter, IN | Pass | State |
| 2026-02-28 | LANSING BOARD OF WATER AND LIGHT - REO TOWN PLANT | LANSING, Ingham, MI | Pass | State |
| 2026-02-28 | DUKE ENERGY CAROLINAS, LLC - BELEWS CREEK STEAM STATION | BELEWS CREEK, Stokes, NC | Pass | State |
| 2026-02-28 | BURTON FLAT DEEP UNIT 35 FACILITY 1 | LA HUERTA, Eddy, NM | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.