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 |
|---|---|---|---|---|
| 2026-02-11 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-02-11 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-02-11 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-02-11 | EXPAND OPERATING LLC/TI-09-BROWN WELL PAD | LIBERTY, Lycoming, PA | Pass | State |
| 2026-02-11 | EXPAND OPERATING LLC/TI-07 CUPPER WELL PAD | LIBERTY, Tioga, PA | Pass | State |
| 2026-02-11 | NAVAL SURFACE WARFARE CENTER - PHILADELPHIA DIVISION | PHILADELPHIA, Philadelphia, PA | Pass | Local |
| 2026-02-11 | NUGEN ENERGY LLC — high-priority violation on file | MARION, Turner, SD | Pass | State |
| 2026-02-11 | TEXAS INSTRUMENTS RICHARDSON | RICHARDSON, Collin, TX | Pass | State |
| 2026-02-11 | TEXAS INSTRUMENTS RICHARDSON | RICHARDSON, Collin, TX | Pass | State |
| 2026-02-11 | TEXAS INSTRUMENTS RICHARDSON | RICHARDSON, Collin, TX | Pass | State |
| 2026-02-11 | TEXAS INSTRUMENTS RICHARDSON | RICHARDSON, Collin, TX | Pass | State |
| 2026-02-11 | TEXAS INSTRUMENTS RICHARDSON | RICHARDSON, Collin, TX | Pass | State |
| 2026-02-11 | TEXAS INSTRUMENTS RICHARDSON | RICHARDSON, Collin, TX | Pass | State |
| 2026-02-11 | TEXAS INSTRUMENTS RICHARDSON | RICHARDSON, Collin, TX | Pass | State |
| 2026-02-11 | TEXAS INSTRUMENTS RICHARDSON | RICHARDSON, Collin, TX | Pass | State |
| 2026-02-11 | TEXAS INSTRUMENTS RICHARDSON | RICHARDSON, Collin, TX | Pass | State |
| 2026-02-11 | TEXAS INSTRUMENTS RICHARDSON | RICHARDSON, Collin, TX | Pass | State |
| 2026-02-11 | TEXAS INSTRUMENTS RICHARDSON | RICHARDSON, Collin, TX | Pass | State |
| 2026-02-11 | THE UNIVERSITY OF TEXAS SOUTHWESTERN MEDICAL CENTER AT DALLAS | DALLAS, Dallas, TX | Pass | State |
| 2026-02-11 | THE UNIVERSITY OF TEXAS SOUTHWESTERN MEDICAL CENTER AT DALLAS | DALLAS, Dallas, TX | Pass | State |
| 2026-02-11 | THE UNIVERSITY OF TEXAS SOUTHWESTERN MEDICAL CENTER AT DALLAS | DALLAS, Dallas, TX | Pass | State |
| 2026-02-11 | HOLCIM TEXAS | MIDLOTHIAN, Ellis, TX | Pass | State |
| 2026-02-11 | HOLCIM TEXAS | MIDLOTHIAN, Ellis, TX | Pass | State |
| 2026-02-11 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2026-02-11 | PUGET SOUND ENERGY (WA NATURAL GAS) | CHEHALIS, Lewis, WA | Pass | Local |
| 2026-02-11 | CRYSTAL FINISHING SYSTEMS INC | SCHOFIELD, Marathon, WI | Pass | State |
| 2026-02-11 | BRADY WORLDWIDE - FLORIST AVE PLT | GLENDALE, Monroe, WI | Pass | State |
| 2026-02-11 | APPALACHIA MIDSTREAM SERVICES, L.L.C., PLEASANTS | ADALINE, Marshall, WV | Pass | State |
| 2026-02-11 | FALCON COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING COMPANY, LLC) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-02-11 | FALCON COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING COMPANY, LLC) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-02-11 | FALCON COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING COMPANY, LLC) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-02-11 | FALCON COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING COMPANY, LLC) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-02-11 | FALCON COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING COMPANY, LLC) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-02-11 | FALCON COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING COMPANY, LLC) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-02-11 | FALCON COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING COMPANY, LLC) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-02-11 | FALCON COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING COMPANY, LLC) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-02-11 | FALCON COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING COMPANY, LLC) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-02-11 | FALCON COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING COMPANY, LLC) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-02-11 | FALCON COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING COMPANY, LLC) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-02-11 | FALCON COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING COMPANY, LLC) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-02-11 | FALCON COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING COMPANY, LLC) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-02-11 | FALCON COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING COMPANY, LLC) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-02-11 | FALCON COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING COMPANY, LLC) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-02-11 | FALCON COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING COMPANY, LLC) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-02-11 | FALCON COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING COMPANY, LLC) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-02-11 | FALCON COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING COMPANY, LLC) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-02-11 | FALCON COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING COMPANY, LLC) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-02-11 | FALCON COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING COMPANY, LLC) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-02-11 | FALCON COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING COMPANY, LLC) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-02-11 | FALCON COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING COMPANY, LLC) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-02-11 | FALCON COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING COMPANY, LLC) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-02-11 | FALCON COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING COMPANY, LLC) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-02-10 | OCCIDENTAL CHEMICAL CORPORATION | MUSCLE SHOALS, Colbert, AL | Pass | State |
| 2026-02-10 | OCCIDENTAL CHEMICAL CORPORATION | MUSCLE SHOALS, Colbert, AL | Pass | State |
| 2026-02-10 | ALABAMA POWER COMPANY (MILLER POWER PLANT) | QUINTON, Jefferson, AL | Pass | Local |
| 2026-02-10 | ALABAMA POWER COMPANY (MILLER POWER PLANT) | QUINTON, Jefferson, AL | Pass | Local |
| 2026-02-10 | EXPLORATORY VENTURES, LLC. | OSCEOLA, Mississippi, AR | Pass | State |
| 2026-02-10 | EXPLORATORY VENTURES, LLC. | OSCEOLA, Mississippi, AR | Pass | State |
| 2026-02-10 | DESOTO GATHERING COMPANY, LLC - STEELHEAD CPF-2 | CLINTON, Van Buren, AR | Pass | State |
| 2026-02-10 | DESOTO GATHERING COMPANY, LLC - STEELHEAD CPF-2 | CLINTON, Van Buren, AR | Pass | State |
| 2026-02-10 | OC WASTE & RECYCLING, OLINDA ALPHA | BREA, Orange, CA | Pass | Local |
| 2026-02-10 | E & J GALLO WINERY & BRANDY — high-priority violation on file | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-02-10 | E & J GALLO WINERY & BRANDY — high-priority violation on file | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-02-10 | E & J GALLO WINERY & BRANDY — high-priority violation on file | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-02-10 | E & J GALLO WINERY & BRANDY — high-priority violation on file | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-02-10 | E & J GALLO WINERY & BRANDY — high-priority violation on file | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-02-10 | E & J GALLO WINERY & BRANDY — high-priority violation on file | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-02-10 | E & J GALLO WINERY & BRANDY — high-priority violation on file | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-02-10 | E & J GALLO WINERY & BRANDY — high-priority violation on file | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-02-10 | COORSTEK INC - CLEAR CREEK VALLEY PLANT — high-priority violation on file | GOLDEN AREA, Jefferson, CO | Fail | State |
| 2026-02-10 | AMERESCO DELAWARE ENERGY - SOUTHERN | GEORGETOWN, Sussex, DE | Pass | State |
| 2026-02-10 | AMERESCO DELAWARE ENERGY - SOUTHERN | GEORGETOWN, Sussex, DE | Pass | State |
| 2026-02-10 | AMERESCO DELAWARE ENERGY - SOUTHERN | GEORGETOWN, Sussex, DE | Pass | State |
| 2026-02-10 | AMERESCO DELAWARE ENERGY - SOUTHERN | GEORGETOWN, Sussex, DE | Pass | State |
| 2026-02-10 | AMERESCO DELAWARE ENERGY - SOUTHERN | GEORGETOWN, Sussex, DE | Pass | State |
| 2026-02-10 | AMERESCO DELAWARE ENERGY - SOUTHERN | GEORGETOWN, Sussex, DE | Pass | State |
| 2026-02-10 | AMERESCO DELAWARE ENERGY - SOUTHERN | GEORGETOWN, Sussex, DE | Pass | State |
| 2026-02-10 | AMERESCO DELAWARE ENERGY - SOUTHERN | GEORGETOWN, Sussex, DE | Pass | State |
| 2026-02-10 | AMERESCO DELAWARE ENERGY - SOUTHERN | GEORGETOWN, Sussex, DE | Pass | State |
| 2026-02-10 | AMERESCO DELAWARE ENERGY - SOUTHERN | GEORGETOWN, Sussex, DE | Pass | State |
| 2026-02-10 | ANHEUSER-BUSCH, LLC | JACKSONVILLE, Duval, FL | Pass | State |
| 2026-02-10 | ANHEUSER-BUSCH, LLC | JACKSONVILLE, Duval, FL | Pass | State |
| 2026-02-10 | ANHEUSER-BUSCH, LLC | JACKSONVILLE, Duval, FL | Pass | State |
| 2026-02-10 | SEMINOLE ELECTRIC COOPERATIVE, INC. | BOWLING GREEN, Hardee, FL | Pass | State |
| 2026-02-10 | SEMINOLE ELECTRIC COOPERATIVE, INC. | BOWLING GREEN, Hardee, FL | Pass | State |
| 2026-02-10 | U.S. SUGAR CORPORATION | CLEWISTON, Hendry, FL | Pass | State |
| 2026-02-10 | U.S. SUGAR CORPORATION | CLEWISTON, Hendry, FL | Pass | State |
| 2026-02-10 | U.S. SUGAR CORPORATION | CLEWISTON, Hendry, FL | Pass | State |
| 2026-02-10 | U.S. SUGAR CORPORATION | CLEWISTON, Hendry, FL | Pass | State |
| 2026-02-10 | U.S. SUGAR CORPORATION | CLEWISTON, Hendry, FL | Pass | State |
| 2026-02-10 | U.S. SUGAR CORPORATION | CLEWISTON, Hendry, FL | Pass | State |
| 2026-02-10 | U.S. SUGAR CORPORATION | CLEWISTON, Hendry, FL | Pass | State |
| 2026-02-10 | U.S. SUGAR CORPORATION | CLEWISTON, Hendry, FL | Pass | State |
| 2026-02-10 | MOSAIC FERTILIZER, LLC — high-priority violation on file | BARTOW, Polk, FL | Pass | State |
| 2026-02-10 | MOSAIC FERTILIZER, LLC — high-priority violation on file | BARTOW, Polk, FL | Pass | State |
| 2026-02-10 | MOSAIC FERTILIZER LLC — high-priority violation on file | MULBERRY, Polk, FL | Pass | State |
| 2026-02-10 | GA POWER CO. - PLANT BOWEN | CARTERSVILLE, Bartow, GA | Pass | State |
| 2026-02-10 | GA POWER CO. - PLANT BOWEN | CARTERSVILLE, Bartow, GA | Pass | State |
| 2026-02-10 | GA POWER CO. - PLANT BOWEN | CARTERSVILLE, Bartow, GA | Pass | State |
| 2026-02-10 | GA POWER CO. - PLANT BOWEN | CARTERSVILLE, Bartow, GA | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.