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 |
|---|---|---|---|---|
| 2026-03-25 | COLUMBIA GAS TRANSMISSION, LLC, FILES CREEK | BEVERLY, Randolph, WV | Pass | State |
| 2026-03-25 | MEADOWLARK COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-03-25 | MEADOWLARK COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-03-25 | MEADOWLARK COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-03-25 | MEADOWLARK COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-03-25 | MEADOWLARK COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-03-25 | MEADOWLARK COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-03-25 | MEADOWLARK COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-03-25 | MEADOWLARK COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-03-25 | MEADOWLARK COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-03-25 | MEADOWLARK COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-03-25 | MEADOWLARK COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-03-25 | MEADOWLARK COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-03-25 | SCOTT COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-03-25 | SCOTT COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-03-25 | SCOTT COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-03-25 | SCOTT COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-03-25 | SCOTT COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-03-25 | SCOTT COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-03-25 | SCOTT COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-03-25 | SCOTT COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-03-25 | SCOTT COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-03-25 | SCOTT COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-03-25 | SCOTT COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-03-25 | SCOTT COMPRESSOR STATION (TALLGRASS MIDSTREAM, LLC) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-03-24 | KETCHIKAN PUBLIC UTILITIES / BAILEY POWERHOUSE | KETCHIKAN, Ketchikan Gateway, AK | Pass | State |
| 2026-03-24 | KRONOSPAN USA — high-priority violation on file | EASTABOGA, Calhoun, AL | Pass | State |
| 2026-03-24 | KRONOSPAN USA — high-priority violation on file | EASTABOGA, Calhoun, AL | Pass | State |
| 2026-03-24 | WILLIAMS MOBILE BAY PRODUCER SERVICES, LLC | CODEN, Mobile, AL | Pass | State |
| 2026-03-24 | WILLIAMS MOBILE BAY PRODUCER SERVICES, LLC | CODEN, Mobile, AL | Pass | State |
| 2026-03-24 | WILLIAMS MOBILE BAY PRODUCER SERVICES, LLC | CODEN, Mobile, AL | Pass | State |
| 2026-03-24 | HYUNDAI MOTOR MANUFACTURING ALABAMA LLC. | MONTGOMERY, Montgomery, AL | Pass | State |
| 2026-03-24 | EL PASO NATURAL GAS CO - DUTCH FLAT COMPRESSOR STATION | FRANCONIA, Mohave, AZ | Pass | State |
| 2026-03-24 | SO CAL GAS - NO. NEEDLES | NEEDLES, San Bernardino, CA | Pass | Local |
| 2026-03-24 | SO CAL GAS - NO. NEEDLES | NEEDLES, San Bernardino, CA | Pass | Local |
| 2026-03-24 | EXTRACTION - ICE MAN PRODUCTION FACILITY | SEVERANCE AREA, Weld, CO | Pass | State |
| 2026-03-24 | MILLIKEN & CO. DBA SIVANCE, LLC | GAINESVILLE, Alachua, FL | Pass | State |
| 2026-03-24 | MIAMI-DADE WATER AND SEWER DEPARTMENT | MIAMI, Miami-Dade, FL | Pass | State |
| 2026-03-24 | MIAMI-DADE WATER AND SEWER DEPARTMENT | MIAMI, Miami-Dade, FL | Pass | State |
| 2026-03-24 | CEMEX CONSTRUCTION MATERIALS FLORIDA,LLC | BROOKSVILLE, Hernando, FL | Pass | State |
| 2026-03-24 | CEMEX CONSTRUCTION MATERIALS FLORIDA,LLC | BROOKSVILLE, Hernando, FL | Pass | State |
| 2026-03-24 | CEMEX CONSTRUCTION MATERIALS FLORIDA,LLC | BROOKSVILLE, Hernando, FL | Pass | State |
| 2026-03-24 | ORLANDO UTILITIES COMMISSION | ORLANDO, Orange, FL | Pass | State |
| 2026-03-24 | FLORIDA POWER & LIGHT (PRV) | RIVIERA BEACH, Palm Beach, FL | Pass | State |
| 2026-03-24 | STANDARD SAND & SILICA CO — high-priority violation on file | DAVENPORT, Polk, FL | Pass | State |
| 2026-03-24 | MOSAIC FERTILIZER LLC — high-priority violation on file | MULBERRY, Polk, FL | Pass | State |
| 2026-03-24 | MOSAIC FERTILIZER LLC — high-priority violation on file | MULBERRY, Polk, FL | Pass | State |
| 2026-03-24 | LANGBOARD - WILLACOOCHEE — high-priority violation on file | WILLACOOCHEE, Atkinson, GA | Pass | State |
| 2026-03-24 | REEVES CONSTRUCTION CO. STATESBORO HOT MIX ASPHALT PLANT | STATESBORO, Bulloch, GA | Pass | State |
| 2026-03-24 | STAKER AND PARSON COMPANIES DBA IDAHO MATERIALS AND CONSTRUCTION 00407 | MERIDIAN, Ada, ID | Pass | State |
| 2026-03-24 | ARCHER DANIELS MIDLAND COMPANY — high-priority violation on file | FRANKFORT, Clinton, IN | Pass | State |
| 2026-03-24 | ARCHER DANIELS MIDLAND COMPANY — high-priority violation on file | FRANKFORT, Clinton, IN | Pass | State |
| 2026-03-24 | DALTON CORPORATION WARSAW MANUFACTURING FACILITY — high-priority violation on file | WARSAW, Kosciusko, IN | Pass | State |
| 2026-03-24 | CARMEUSE LIME INCORPORATED — high-priority violation on file | GARY, Lake, IN | Pass | State |
| 2026-03-24 | CARMEUSE LIME INCORPORATED — high-priority violation on file | GARY, Lake, IN | Pass | State |
| 2026-03-24 | US STEEL CORPORATION GARY WORKS — high-priority violation on file | GARY, Lake, IN | Pass | State |
| 2026-03-24 | HEIDELBERG MATERIALS US CEMENT LLC — high-priority violation on file | MITCHELL, Lawrence, IN | Pass | State |
| 2026-03-24 | HEIDELBERG MATERIALS US CEMENT LLC — high-priority violation on file | MITCHELL, Lawrence, IN | Pass | State |
| 2026-03-24 | HEIDELBERG MATERIALS US CEMENT LLC — high-priority violation on file | MITCHELL, Lawrence, IN | Pass | State |
| 2026-03-24 | HEIDELBERG MATERIALS US CEMENT LLC — high-priority violation on file | MITCHELL, Lawrence, IN | Pass | State |
| 2026-03-24 | ALCOA POWER GENERATING INC WARRICK POWER PLANT — high-priority violation on file | NEWBURGH, Warrick, IN | Fail | State |
| 2026-03-24 | ALCOA POWER GENERATING INC WARRICK POWER PLANT — high-priority violation on file | NEWBURGH, Warrick, IN | Pass | State |
| 2026-03-24 | LOGAN ALUMINUM INC | RUSSELLVILLE, Logan, KY | Pass | State |
| 2026-03-24 | LOGAN ALUMINUM INC | RUSSELLVILLE, Logan, KY | Pass | State |
| 2026-03-24 | BAYSTATE MEDICAL CENTER | SPRINGFIELD, CITY OF, Hampden, MA | Pending | State |
| 2026-03-24 | BAYSTATE MEDICAL CENTER | SPRINGFIELD, CITY OF, Hampden, MA | Pending | State |
| 2026-03-24 | CABINETWORKS GROUP | WACONIA, Carver, MN | Pass | State |
| 2026-03-24 | FLINT HILLS RESOURCES PINE BEND REFINERY | ROSEMOUNT, Dakota, MN | Pass | State |
| 2026-03-24 | KODA ENERGY, LLC — high-priority violation on file | SHAKOPEE, Scott, MN | Pass | State |
| 2026-03-24 | AC POLYMERS INC | BYHALIA, Marshall, MS | Pass | State |
| 2026-03-24 | GREEN PLAINS YORK LLC — high-priority violation on file | YORK, York, NE | Fail | State |
| 2026-03-24 | NE RENEWABLE POWER WHITEFIELD | WHITEFIELD, Coos, NH | Pass | State |
| 2026-03-24 | SOUTH CARLSBAD COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2026-03-24 | SOUTH CARLSBAD COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2026-03-24 | SOUTH CARLSBAD COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2026-03-24 | COTTONWOOD COMPRESSOR STATION | WHITES CITY, Eddy, NM | Pass | State |
| 2026-03-24 | RANA SALADA A PAD | LOVING, Eddy, NM | Pass | State |
| 2026-03-24 | TEXANA COMPRESSOR STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2026-03-24 | MERCHANT CENTRAL BATTERY | EUNICE, Lea, NM | Pass | State |
| 2026-03-24 | PABCO GYPSUM | LAS VEGAS, Clark, NV | Fail | Local |
| 2026-03-24 | PERFORMANCE MANUFACTURING CENTER | MARYSVILLE, Union, OH | Pass | State |
| 2026-03-24 | PERFORMANCE MANUFACTURING CENTER | MARYSVILLE, Union, OH | Pass | State |
| 2026-03-24 | PERFORMANCE MANUFACTURING CENTER | MARYSVILLE, Union, OH | Pass | State |
| 2026-03-24 | ERIE GENERATING STATION | MILAN, Erie, OH | Pass | State |
| 2026-03-24 | ERIE GENERATING STATION | MILAN, Erie, OH | Pass | State |
| 2026-03-24 | ERIE GENERATING STATION | MILAN, Erie, OH | Pass | State |
| 2026-03-24 | ERIE GENERATING STATION | MILAN, Erie, OH | Pass | State |
| 2026-03-24 | ERIE GENERATING STATION | MILAN, Erie, OH | Pass | State |
| 2026-03-24 | ERIE GENERATING STATION | MILAN, Erie, OH | Pass | State |
| 2026-03-24 | ASCENT RESOURCES - UTICA LLC - COOK UNIT WELL PAD | RICHLAND, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-03-24 | ASCENT RESOURCES - UTICA LLC - COOK UNIT WELL PAD | RICHLAND, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-03-24 | ASCENT RESOURCES - UTICA LLC - COOK UNIT WELL PAD | RICHLAND, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-03-24 | ASCENT RESOURCES - UTICA, LLC - KEMPER | BELLAIRE, Belmont, OH | Pass | State |
| 2026-03-24 | ASCENT RESOURCES - UTICA, LLC - KEMPER | BELLAIRE, Belmont, OH | Pass | State |
| 2026-03-24 | ASCENT RESOURCES - UTICA, LLC - KEMPER | BELLAIRE, Belmont, OH | Pass | State |
| 2026-03-24 | ASCENT RESOURCES-UTICA, LLC - ALPHA ATH HR | CADIZ, Harrison, OH | Pass | State |
| 2026-03-24 | ASCENT RESOURCES-UTICA, LLC - ALPHA ATH HR | CADIZ, Harrison, OH | Pass | State |
| 2026-03-24 | ASCENT RESOURCES-UTICA, LLC - ALPHA ATH HR | CADIZ, Harrison, OH | Pass | State |
| 2026-03-24 | ASCENT RESOURCES - UTICA LLC - SHEPORGI GRN HR | CADIZ, Harrison, OH | Pass | State |
| 2026-03-24 | ASCENT RESOURCES - UTICA LLC - SHEPORGI GRN HR | CADIZ, Harrison, OH | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.