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 |
|---|---|---|---|---|
| 2026-04-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2026-04-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2026-04-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2026-04-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2026-04-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2026-04-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2026-04-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2026-04-09 | POET BIOREFINING PORTLAND LLC | PORTLAND, Jay, IN | Pass | State |
| 2026-04-09 | POET BIOREFINING PORTLAND LLC | PORTLAND, Jay, IN | Pass | State |
| 2026-04-09 | POET BIOREFINING PORTLAND LLC | PORTLAND, Jay, IN | Pass | State |
| 2026-04-09 | POET BIOREFINING PORTLAND LLC | PORTLAND, Jay, IN | Pass | State |
| 2026-04-09 | POET BIOREFINING PORTLAND LLC | PORTLAND, Jay, IN | Pass | State |
| 2026-04-09 | POET BIOREFINING PORTLAND LLC | PORTLAND, Jay, IN | Pass | State |
| 2026-04-09 | POET BIOREFINING PORTLAND LLC | PORTLAND, Jay, IN | Pass | State |
| 2026-04-09 | POET BIOREFINING PORTLAND LLC | PORTLAND, Jay, IN | Pass | State |
| 2026-04-09 | POET BIOREFINING PORTLAND LLC | PORTLAND, Jay, IN | Pass | State |
| 2026-04-09 | UNIVERSITY OF NOTRE DAME DU LAC | NOTRE DAME, St. Joseph, IN | Pass | State |
| 2026-04-09 | PRIMARY PRODUCTS INGREDIENTS AMERICAS, LLC | LAFAYETTE, Tippecanoe, IN | Pass | State |
| 2026-04-09 | MENARD INCORPORATED | TERRE HAUTE, Vigo, IN | Pass | State |
| 2026-04-09 | MENARD INCORPORATED | TERRE HAUTE, Vigo, IN | Pass | State |
| 2026-04-09 | MENARD INCORPORATED | TERRE HAUTE, Vigo, IN | Pass | State |
| 2026-04-09 | MENARD INCORPORATED | TERRE HAUTE, Vigo, IN | Pass | State |
| 2026-04-09 | MENARD INCORPORATED | TERRE HAUTE, Vigo, IN | Pass | State |
| 2026-04-09 | MENARD INCORPORATED | TERRE HAUTE, Vigo, IN | Pass | State |
| 2026-04-09 | MENARD INCORPORATED | TERRE HAUTE, Vigo, IN | Pass | State |
| 2026-04-09 | MENARD INCORPORATED | TERRE HAUTE, Vigo, IN | Pass | State |
| 2026-04-09 | GUARDIAN INDUSTRIES-CARLETON | CARLETON, Monroe, MI | Pass | State |
| 2026-04-09 | COLUMBIA SANITARY LANDFILL | COLUMBIA, Boone, MO | Pass | State |
| 2026-04-09 | COLUMBIA SANITARY LANDFILL | COLUMBIA, Boone, MO | Pass | State |
| 2026-04-09 | COLUMBIA SANITARY LANDFILL | COLUMBIA, Boone, MO | Pass | State |
| 2026-04-09 | RIVER CEMENT CO. DBA BUZZI UNICEM USA SELMA PLANT | FESTUS, Jefferson, MO | Pass | State |
| 2026-04-09 | RIVER CEMENT CO. DBA BUZZI UNICEM USA SELMA PLANT | FESTUS, Jefferson, MO | Pass | State |
| 2026-04-09 | COLSTRIP STEAM ELECTRIC STATION | COLSTRIP, Rosebud, MT | Pass | State |
| 2026-04-09 | COLSTRIP STEAM ELECTRIC STATION | COLSTRIP, Rosebud, MT | Pass | State |
| 2026-04-09 | COLSTRIP STEAM ELECTRIC STATION | COLSTRIP, Rosebud, MT | Pass | State |
| 2026-04-09 | COLSTRIP STEAM ELECTRIC STATION | COLSTRIP, Rosebud, MT | Pass | State |
| 2026-04-09 | HILAND PARTNERS HOLDINGS LLC - STONY CREEK COMPRESSOR STATION | WILLISTON, Williams, ND | Pass | State |
| 2026-04-09 | ARROWHEAD COMPRESSOR STATION | LOCO HILLS, Eddy, NM | Pass | State |
| 2026-04-09 | NOEL HENSLEY FED PRODUCTION FACILITY | MALAGA, Eddy, NM | Pass | State |
| 2026-04-09 | BO HOWARD TB | CARLSBAD, Eddy, NM | Pass | State |
| 2026-04-09 | REVEILLE COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2026-04-09 | REVEILLE COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2026-04-09 | BENT TREE 9 CTB 2 | LA HUERTA, Eddy, NM | Pass | State |
| 2026-04-09 | TANTO COMPRESSOR STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2026-04-09 | LHOIST NORTH AMERICA OF ARIZONA - APEX PLANT — high-priority violation on file | LAS VEGAS, Clark, NV | Pass | Local |
| 2026-04-09 | LANCASTER CNTY RRF/ LANCASTER — high-priority violation on file | BAINBRIDGE, Lancaster, PA | Pass | State |
| 2026-04-09 | GREATER HAZLETON JT SEW AUTH/WEST HAZLETON STP — high-priority violation on file | WEST HAZLETON, Luzerne, PA | Pass | State |
| 2026-04-09 | TENNESSEE GAS PIPELINE CO LLC/MERCER STA 219 | MERCER, Mercer, PA | Pass | State |
| 2026-04-09 | MARKWEST LIBERTY MIDSTREAM & RESOURCES/SHAW COMP STA | WASHINGTON, Washington, PA | Pass | State |
| 2026-04-09 | TEXAS EASTERN TRANS LP/CHAMBERSBURG | CHAMBERSBURG, Franklin, PA | Pass | State |
| 2026-04-09 | SQUIER, R. PAD 1 — high-priority violation on file | KINGSLEY, Susquehanna, PA | Pass | State |
| 2026-04-09 | NEXTERA RENEWABLE FUELS LLC/WESTERN BERKS LDFL | BIRDSBORO, Berks, PA | Pass | State |
| 2026-04-09 | KING ASPHALT INC | PACOLET, Spartanburg, SC | Pending | State |
| 2026-04-09 | PALMETTO CORPORATION OF CONWAY - ORANGEBURG PLANT — high-priority violation on file | BOWMAN, Orangeburg, SC | Pass | State |
| 2026-04-09 | OWENS CORNING INSULATING SYSTEMS WAXAHACHIE PLANT | WAXAHACHIE, Ellis, TX | Fail | State |
| 2026-04-09 | OWENS CORNING INSULATING SYSTEMS WAXAHACHIE PLANT | WAXAHACHIE, Ellis, TX | Fail | State |
| 2026-04-09 | GAINESVILLE CROSSING DATA CAMPUS - GCDC | GAINESVILLE, Prince William, VA | Pass | State |
| 2026-04-09 | SUPERIOR REFINING COMPANY LLC — high-priority violation on file | SUPERIOR, Douglas, WI | Pass | State |
| 2026-04-09 | SUPERIOR REFINING COMPANY LLC — high-priority violation on file | SUPERIOR, Douglas, WI | Pass | State |
| 2026-04-09 | ARDAGH GLASS INC — high-priority violation on file | BURLINGTON, Richland, WI | N/A | State |
| 2026-04-09 | CHEYENNE PRAIRIE GENERATING STATION (CHEYENNE LIGHT FUEL & POWER) | CHEYENNE, Laramie, WY | Pass | State |
| 2026-04-09 | CHEYENNE PRAIRIE GENERATING STATION (CHEYENNE LIGHT FUEL & POWER) | CHEYENNE, Laramie, WY | Pass | State |
| 2026-04-09 | CHEYENNE PRAIRIE GENERATING STATION (CHEYENNE LIGHT FUEL & POWER) | CHEYENNE, Laramie, WY | Pass | State |
| 2026-04-08 | JOHNSON COMPRESSOR STATION | MANDAREE, McKenzie, ND | Pass | U.S. EPA |
| 2026-04-08 | JOHNSON COMPRESSOR STATION | MANDAREE, McKenzie, ND | Pass | U.S. EPA |
| 2026-04-08 | CONOCOPHILLIPS ALASKA, INC. / ALPINE CENTRAL PROCESSING FACILITY | NORTH SLOPE BOROUGH, North Slope, AK | Pass | State |
| 2026-04-08 | CONSTELLIUM — high-priority violation on file | MUSCLE SHOALS, Colbert, AL | Pass | State |
| 2026-04-08 | MAGELLAN TERMINALS | BIRMINGHAM, Jefferson, AL | Pass | Local |
| 2026-04-08 | DESOTO GATHERING COMPANY, LLC - COVE CREEK CPF-3 | SPRINGFIELD, Conway, AR | Pass | State |
| 2026-04-08 | ARKANSAS STEEL ASSOCIATES, LLC | NEWPORT, Jackson, AR | Pass | State |
| 2026-04-08 | ARKANSAS STEEL ASSOCIATES, LLC | NEWPORT, Jackson, AR | Pass | State |
| 2026-04-08 | DESOTO GATHERING COMPANY, LLC - COVE CREEK CPF-2 | BEE BRANCH, Van Buren, AR | Pass | State |
| 2026-04-08 | COLUMBIA COUNTY LANDFILL | MAGNOLIA, Columbia, AR | Pass | State |
| 2026-04-08 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-04-08 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-04-08 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-04-08 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-04-08 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-04-08 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-04-08 | LARAMIE ENERGY - NICHOLS 24-06A PAD | COLLBRAN 6.6 MI. N OF, Mesa, CO | Pass | State |
| 2026-04-08 | CF & I STEEL L.P. DBA EVRAZ ROCKY MTN ST — high-priority violation on file | PUEBLO AREA, Pueblo, CO | Pass | State |
| 2026-04-08 | WES DJ FT LUPTON/PLATTE VALLEY/LANCASTER — high-priority violation on file | FORT LUPTON, Weld, CO | Pass | State |
| 2026-04-08 | DCP OPERATING CO - MEWBOURN — high-priority violation on file | GILCREST 2.4 MI. N OF, Weld, CO | Pass | State |
| 2026-04-08 | DCP OPERATING CO - MEWBOURN — high-priority violation on file | GILCREST 2.4 MI. N OF, Weld, CO | Pass | State |
| 2026-04-08 | WES DJ GATHERING - LATHAM GAS PLANT | GILCREST 2.4 MI. N OF, Weld, CO | Pass | State |
| 2026-04-08 | QUIKRETE CONSTRUCTION MATERIALS, LLC | NEWBERRY, Alachua, FL | Pass | State |
| 2026-04-08 | MIAMI-DADE WATER AND SEWER DEPARTMENT | MIAMI, Miami-Dade, FL | Pass | State |
| 2026-04-08 | MIAMI-DADE WATER AND SEWER DEPARTMENT | MIAMI, Miami-Dade, FL | Pass | State |
| 2026-04-08 | JEA | JACKSONVILLE, Duval, FL | Pass | State |
| 2026-04-08 | JEA | JACKSONVILLE, Duval, FL | Pass | State |
| 2026-04-08 | JEA | JACKSONVILLE, Duval, FL | Pass | State |
| 2026-04-08 | WASTE CONNECTIONS OF OSCEOLA COUNTY, LLC | SAINT CLOUD, Osceola, FL | Pass | State |
| 2026-04-08 | WASTE CONNECTIONS OF OSCEOLA COUNTY, LLC | SAINT CLOUD, Osceola, FL | Pass | State |
| 2026-04-08 | WASTE CONNECTIONS OF OSCEOLA COUNTY, LLC | SAINT CLOUD, Osceola, FL | Pass | State |
| 2026-04-08 | WASTE CONNECTIONS OF OSCEOLA COUNTY, LLC | SAINT CLOUD, Osceola, FL | Pass | State |
| 2026-04-08 | WASTE CONNECTIONS OF OSCEOLA COUNTY, LLC | SAINT CLOUD, Osceola, FL | Pass | State |
| 2026-04-08 | WASTE CONNECTIONS OF OSCEOLA COUNTY, LLC | SAINT CLOUD, Osceola, FL | Pass | State |
| 2026-04-08 | WASTE CONNECTIONS OF OSCEOLA COUNTY, LLC | SAINT CLOUD, Osceola, FL | Pass | State |
| 2026-04-08 | WASTE CONNECTIONS OF OSCEOLA COUNTY, LLC | SAINT CLOUD, Osceola, FL | Pass | State |
| 2026-04-08 | WASTE CONNECTIONS OF OSCEOLA COUNTY, LLC | SAINT CLOUD, Osceola, FL | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.