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 |
|---|---|---|---|---|
| 2026-04-08 | 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 |
| 2026-04-08 | GRAPHIC PACKAGING INTERNATIONAL, LLC - MACON MILL | MACON, Bibb, GA | Fail | State |
| 2026-04-08 | FLOWERS BAKING COMPANY OF TUCKER, LLC | TUCKER, DeKalb, GA | Pass | State |
| 2026-04-08 | INTERNATIONAL PAPER COMPANY - ROME MILL | ROME, Floyd, GA | Pass | State |
| 2026-04-08 | INTERNATIONAL PAPER COMPANY - ROME MILL | ROME, Floyd, GA | Pass | State |
| 2026-04-08 | MAS ASB COGEN LLC CHP FACILITY | ATLANTA, Fulton, GA | Pass | State |
| 2026-04-08 | MAS ASB COGEN LLC CHP FACILITY | ATLANTA, Fulton, GA | Pass | State |
| 2026-04-08 | MAS ASB COGEN LLC CHP FACILITY | ATLANTA, Fulton, GA | Pass | State |
| 2026-04-08 | MAHIPAPA | KOLOA, Kauai, HI | Pass | State |
| 2026-04-08 | GARFIELD FACILITY LLC — high-priority violation on file | MUNCIE, Delaware, IN | Pass | State |
| 2026-04-08 | GARFIELD FACILITY LLC — high-priority violation on file | MUNCIE, Delaware, IN | Pass | State |
| 2026-04-08 | GARFIELD FACILITY LLC — high-priority violation on file | MUNCIE, Delaware, IN | Pass | State |
| 2026-04-08 | ANR PIPELINE CO CELESTINE COMPRESSOR STATION | CELESTINE, Dubois, IN | Pass | State |
| 2026-04-08 | ANR PIPELINE CO CELESTINE COMPRESSOR STATION | CELESTINE, Dubois, IN | Pass | State |
| 2026-04-08 | POET BIOREFINING PORTLAND LLC | PORTLAND, Jay, IN | Pass | State |
| 2026-04-08 | POET BIOREFINING PORTLAND LLC | PORTLAND, Jay, IN | Pass | State |
| 2026-04-08 | NUCOR STEEL — high-priority violation on file | CRAWFORDSVILLE, Montgomery, IN | Pass | State |
| 2026-04-08 | NUCOR STEEL — high-priority violation on file | CRAWFORDSVILLE, Montgomery, IN | Pass | State |
| 2026-04-08 | NUCOR STEEL — high-priority violation on file | CRAWFORDSVILLE, Montgomery, IN | Pass | State |
| 2026-04-08 | NUCOR STEEL — high-priority violation on file | CRAWFORDSVILLE, Montgomery, IN | Pass | State |
| 2026-04-08 | PANHANDLE EASTERN PIPELINE COMPANY | MONTEZUMA, Parke, IN | Pass | State |
| 2026-04-08 | PANHANDLE EASTERN PIPELINE COMPANY | MONTEZUMA, Parke, IN | Pass | State |
| 2026-04-08 | UNIVERSITY OF NOTRE DAME DU LAC | NOTRE DAME, St. Joseph, IN | Pass | State |
| 2026-04-08 | UNIVERSITY OF NOTRE DAME DU LAC | NOTRE DAME, St. Joseph, IN | Pass | State |
| 2026-04-08 | PRIMARY PRODUCTS INGREDIENTS AMERICAS, LLC | LAFAYETTE, Tippecanoe, IN | Pass | State |
| 2026-04-08 | PRIMARY PRODUCTS INGREDIENTS AMERICAS, LLC | LAFAYETTE, Tippecanoe, IN | Pass | State |
| 2026-04-08 | PRIMARY PRODUCTS INGREDIENTS AMERICAS, LLC | LAFAYETTE, Tippecanoe, IN | Pass | State |
| 2026-04-08 | MONARCH CEMENT (AIR) | HUMBOLDT, Allen, KS | Pass | State |
| 2026-04-08 | OSBORNE MUN. POWER PLANT (AIR) | OSBORNE, Osborne, KS | Pass | State |
| 2026-04-08 | SHARON SPRINGS MUN. POWER PLANT (AIR) | SHARON SPRINGS, Wallace, KS | Pass | State |
| 2026-04-08 | METAL TECHNOLOGIES, INC. THREE RIVERS GRAY IRON | THREE RIVERS, St. Joseph, MI | Pass | State |
| 2026-04-08 | FCA US LLC STERLING HEIGHTS ASSEMBLY PLANT | STERLING HEIGHTS, Macomb, MI | Pass | State |
| 2026-04-08 | DTE GAS COMPANY - WILLOW RUN COMPRESSOR STATION | YPSILANTI, Washtenaw, MI | Pass | State |
| 2026-04-08 | CABINETWORKS GROUP | WACONIA, Carver, MN | Pass | State |
| 2026-04-08 | CHIPPEWA VALLEY ETHANOL COMPANY | BENSON, Swift, MN | Pass | State |
| 2026-04-08 | LSP COTTAGE GROVE COGENERATION FACILITY | COTTAGE GROVE, Washington, MN | Pass | State |
| 2026-04-08 | COLSTRIP STEAM ELECTRIC STATION | COLSTRIP, Rosebud, MT | Pass | State |
| 2026-04-08 | COLSTRIP STEAM ELECTRIC STATION | COLSTRIP, Rosebud, MT | Pass | State |
| 2026-04-08 | WAKE STONE CORP - MONCURE QUARRY | MONCURE, Lee, NC | Pass | State |
| 2026-04-08 | ROUGH RIDER BAKKEN G&P LLC, A SUBSIDIARY OF ENERGY TRANSFER, LP - WILD BASIN GAS | WATFORD CITY, McKenzie, ND | N/A | State |
| 2026-04-08 | ROUGH RIDER BAKKEN G&P LLC, A SUBSIDIARY OF ENERGY TRANSFER, LP - WILD BASIN GAS | WATFORD CITY, McKenzie, ND | N/A | State |
| 2026-04-08 | BAY MEADOWS COMPRESSOR STATION | WHITES CITY, Eddy, NM | Pass | State |
| 2026-04-08 | MICHAEL RYAN TB | LIVINGSTON WHEELER, Eddy, NM | Pass | State |
| 2026-04-08 | REVEILLE COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2026-04-08 | REVEILLE COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2026-04-08 | TANTO COMPRESSOR STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2026-04-08 | TANTO COMPRESSOR STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2026-04-08 | TRAVIS STATE COM TB | LOCO HILLS, Eddy, NM | Pass | State |
| 2026-04-08 | ABU COMPRESSOR STATION — high-priority violation on file | JAL, Lea, NM | Pass | State |
| 2026-04-08 | ABU COMPRESSOR STATION — high-priority violation on file | JAL, Lea, NM | Pass | State |
| 2026-04-08 | GREYHOUND COMPRESSOR STATION | EUNICE, Lea, NM | Pass | State |
| 2026-04-08 | DOS EQUIS 12-13 FED 5H 6H 73H 86H FACILITY | LOVING, Lea, NM | Pass | State |
| 2026-04-08 | VANDELAY COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-04-08 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-04-08 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-04-08 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-04-08 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-04-08 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-04-08 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-04-08 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-04-08 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-04-08 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-04-08 | CLEVELAND-CLIFFS STEEL CORPORATION — high-priority violation on file | MIDDLETOWN, Butler, OH | Pass | State |
| 2026-04-08 | CLEVELAND-CLIFFS STEEL CORPORATION — high-priority violation on file | MIDDLETOWN, Butler, OH | Pass | State |
| 2026-04-08 | MARKWEST OKLAHOMA GAS CO LLC / DOROTHY COMPRESSOR STATION | KINGFISHER, Kingfisher, OK | Pass | State |
| 2026-04-08 | TENNESSEE GAS PIPELINE/MARIENVILLE STA 307 | MARIENVILLE, Forest, PA | Pass | State |
| 2026-04-08 | INGENCO WHOLESALE POWER LLC/MTN VIEW LDFL | GREENCASTLE, Franklin, PA | Pass | State |
| 2026-04-08 | STECKMAN RIDGE LP/CLEARVILLE | CLEARVILLE, Bedford, PA | Pass | State |
| 2026-04-08 | WARREN EP INC/REIMILLER PAD | MESHOPPEN, Wyoming, PA | Pass | State |
| 2026-04-08 | IKO GLASS FIBER INC - CHESTER PLANT | CHESTER, Chester, SC | Pending | State |
| 2026-04-08 | PALMETTO PAVING LUGOFF | LUGOFF, Kershaw, SC | Pass | State |
| 2026-04-08 | KINDER MORGAN LLC - MAIN GAS PLANT | ALTAMONT, Duchesne, UT | Pass | State |
| 2026-04-08 | KINDER MORGAN LLC - MAIN GAS PLANT | ALTAMONT, Duchesne, UT | Pass | State |
| 2026-04-08 | KINDER MORGAN LLC - MAIN GAS PLANT | ALTAMONT, Duchesne, UT | Pass | State |
| 2026-04-08 | ROANOKE CEMENT COMPANY | TROUTVILLE, Botetourt, VA | Pass | State |
| 2026-04-08 | MICROSOFT - GAINESVILLE DATA CENTER - MNZ03 | BRISTOW, Prince William, VA | Pass | State |
| 2026-04-08 | BIMBO BAKEHOUSE LLC | ROANOKE, Roanoke (city), VA | Pass | State |
| 2026-04-08 | SUPERIOR REFINING COMPANY LLC — high-priority violation on file | SUPERIOR, Douglas, WI | Pass | State |
| 2026-04-08 | EUREKA MIDSTREAM, LLC, CARBIDE SITE | HASTINGS, Wetzel, WV | Pass | State |
| 2026-04-08 | STEAMBOAT PROCESSING FACILITY (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-04-08 | STEAMBOAT PROCESSING FACILITY (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-04-08 | AUGUSTA-PEBBLE BEACH COMPRESSOR STATION (PRONGHORN MIDSTREAM LLC) | JOHNSON COUNTY, Johnson, WY | Pass | State |
| 2026-04-08 | AUGUSTA-PEBBLE BEACH COMPRESSOR STATION (PRONGHORN MIDSTREAM LLC) | JOHNSON COUNTY, Johnson, WY | Pass | State |
| 2026-04-08 | AUGUSTA-PEBBLE BEACH COMPRESSOR STATION (PRONGHORN MIDSTREAM LLC) | JOHNSON COUNTY, Johnson, WY | Pass | State |
| 2026-04-07 | CONOCOPHILLIPS ALASKA, INC. / ALPINE CENTRAL PROCESSING FACILITY | NORTH SLOPE BOROUGH, North Slope, AK | Pass | State |
| 2026-04-07 | CONSTELLIUM — high-priority violation on file | MUSCLE SHOALS, Colbert, AL | Pass | State |
| 2026-04-07 | SOUTHERN NATURAL GAS | ELMORE, Elmore, AL | Pass | State |
| 2026-04-07 | SOUTHERN NATURAL GAS | ELMORE, Elmore, AL | Pass | State |
| 2026-04-07 | AMERICAN CAST IRON PIPE COMPANY | BIRMINGHAM, Jefferson, AL | Pass | Local |
| 2026-04-07 | ENABLE MRT, LLC - GLENDALE COMPRESSOR STATION | STAR CITY, Lincoln, AR | Pass | State |
| 2026-04-07 | ENABLE MRT, LLC - GLENDALE COMPRESSOR STATION | STAR CITY, Lincoln, AR | Pass | State |
| 2026-04-07 | ENABLE MRT, LLC - GLENDALE COMPRESSOR STATION | STAR CITY, Lincoln, AR | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.