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 |
|---|---|---|---|---|
| 2026-03-20 | MARKWEST LIBERTY MIDSTREAM & RESOURCES/HARMON CREEK GAS PLT — high-priority violation on file | BULGER, Washington, PA | Pass | State |
| 2026-03-20 | COVESTRO LLC, NEW MARTINSVILLE | PROCTOR, Marshall, WV | Pass | State |
| 2026-03-20 | FONTENELLE STATION (MOUNTAIN GAS RESOURCES LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-03-20 | FONTENELLE STATION (MOUNTAIN GAS RESOURCES LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-03-20 | FONTENELLE STATION (MOUNTAIN GAS RESOURCES LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-03-19 | WESTROCK COATED BOARD LLC-MAHRT MILL | PHENIX CITY, Russell, AL | Pass | State |
| 2026-03-19 | USMC - AGCC 29 PALMS | TWENTYNINE PALMS, San Bernardino, CA | Pass | Local |
| 2026-03-19 | USMC - AGCC 29 PALMS | TWENTYNINE PALMS, San Bernardino, CA | Pass | Local |
| 2026-03-19 | USMC - AGCC 29 PALMS | TWENTYNINE PALMS, San Bernardino, CA | Pass | Local |
| 2026-03-19 | GLASS HOUSE CAMARILLO CULTIVATION LLC | CAMARILLO, Ventura, CA | Pass | Local |
| 2026-03-19 | QB ENERGY OPERATING - MESA E1-797 PF | PARACHUTE 5.7 MI. N OF, Garfield, CO | N/A | State |
| 2026-03-19 | QB ENERGY OPERATING - F21OU PF | DEBEQUE 5.0 MI. E OF, Mesa, CO | N/A | State |
| 2026-03-19 | EMORY UNIVERSITY | ATLANTA, DeKalb, GA | Pass | State |
| 2026-03-19 | GEORGIA-PACIFIC SAVANNAH RIVER LLC | RINCON, Effingham, GA | Pass | State |
| 2026-03-19 | GEORGIA-PACIFIC SAVANNAH RIVER LLC | RINCON, Effingham, GA | Pass | State |
| 2026-03-19 | WESTROCK SOUTHEAST, LLC | EAST DUBLIN, Laurens, GA | Pass | State |
| 2026-03-19 | WESTROCK SOUTHEAST, LLC | EAST DUBLIN, Laurens, GA | Pass | State |
| 2026-03-19 | ASAMA COLDWATER MANUFACTURING GEORGIA | WARRENTON, Warren, GA | Pass | State |
| 2026-03-19 | AMSTED RAIL COMPANY, INC | KEOKUK, Lee, IA | Pass | State |
| 2026-03-19 | GRAIN PROCESSING CORPORATION — high-priority violation on file | WASHINGTON, Daviess, IN | Pass | State |
| 2026-03-19 | GRAIN PROCESSING CORPORATION — high-priority violation on file | WASHINGTON, Daviess, IN | Pass | State |
| 2026-03-19 | GRAIN PROCESSING CORPORATION — high-priority violation on file | WASHINGTON, Daviess, IN | Pass | State |
| 2026-03-19 | ROCHESTER METAL PRODUCTS CORPORATION — high-priority violation on file | ROCHESTER, Fulton, IN | Pass | State |
| 2026-03-19 | ROCHESTER METAL PRODUCTS CORPORATION — high-priority violation on file | ROCHESTER, Fulton, IN | Pass | State |
| 2026-03-19 | ROCHESTER METAL PRODUCTS CORPORATION — high-priority violation on file | ROCHESTER, Fulton, IN | Pass | State |
| 2026-03-19 | ROCHESTER METAL PRODUCTS CORPORATION — high-priority violation on file | ROCHESTER, Fulton, IN | Pass | State |
| 2026-03-19 | ROCHESTER METAL PRODUCTS CORPORATION — high-priority violation on file | ROCHESTER, Fulton, IN | Pass | State |
| 2026-03-19 | ROCHESTER METAL PRODUCTS CORPORATION — high-priority violation on file | ROCHESTER, Fulton, IN | Pass | State |
| 2026-03-19 | DALTON CORPORATION WARSAW MANUFACTURING FACILITY — high-priority violation on file | WARSAW, Kosciusko, IN | Pass | State |
| 2026-03-19 | DALTON CORPORATION WARSAW MANUFACTURING FACILITY — high-priority violation on file | WARSAW, Kosciusko, IN | Pass | State |
| 2026-03-19 | DALTON CORPORATION WARSAW MANUFACTURING FACILITY — high-priority violation on file | WARSAW, Kosciusko, IN | Pass | State |
| 2026-03-19 | DALTON CORPORATION WARSAW MANUFACTURING FACILITY — high-priority violation on file | WARSAW, Kosciusko, IN | Pass | State |
| 2026-03-19 | DALTON CORPORATION WARSAW MANUFACTURING FACILITY — high-priority violation on file | WARSAW, Kosciusko, IN | Pass | State |
| 2026-03-19 | CARMEUSE LIME INCORPORATED — high-priority violation on file | GARY, Lake, IN | Pass | State |
| 2026-03-19 | CARMEUSE LIME INCORPORATED — high-priority violation on file | GARY, Lake, IN | Pass | State |
| 2026-03-19 | HAMMOND GROUP INCORPORATED | HAMMOND, Lake, IN | Pass | State |
| 2026-03-19 | HEIDELBERG MATERIALS US CEMENT LLC — high-priority violation on file | MITCHELL, Lawrence, IN | Pass | State |
| 2026-03-19 | HEIDELBERG MATERIALS US CEMENT LLC — high-priority violation on file | MITCHELL, Lawrence, IN | Pass | State |
| 2026-03-19 | HEIDELBERG MATERIALS US CEMENT LLC — high-priority violation on file | MITCHELL, Lawrence, IN | Pass | State |
| 2026-03-19 | HEIDELBERG MATERIALS US CEMENT LLC — high-priority violation on file | MITCHELL, Lawrence, IN | Pass | State |
| 2026-03-19 | BLUE RIVER VALLEY TERMINAL (AIR) | POTWIN, Butler, KS | Pass | State |
| 2026-03-19 | HUGOTON MUN. POWER PLANT #2 (AIR) | HUGOTON, Stevens, KS | Pass | State |
| 2026-03-19 | HARSHMAN CONST (MASTER EQUIP LIST) (AIR) | CEDAR POINT, Marion, KS | Pass | State |
| 2026-03-19 | HARSHMAN CONST (MASTER EQUIP LIST) (AIR) | CEDAR POINT, Marion, KS | Pass | State |
| 2026-03-19 | DETROIT METROPOLITAN WAYNE COUNTY AIRPORT | DETROIT, Wayne, MI | Pass | State |
| 2026-03-19 | LITTLE BLUE VALLEY SEWER DISTRICT - ATHERTON WASTEWATER TREATMENT PLANT | INDEPENDENCE, Jackson, MO | Pass | State |
| 2026-03-19 | LITTLE BLUE VALLEY SEWER DISTRICT - ATHERTON WASTEWATER TREATMENT PLANT | INDEPENDENCE, Jackson, MO | Pass | State |
| 2026-03-19 | LITTLE BLUE VALLEY SEWER DISTRICT - ATHERTON WASTEWATER TREATMENT PLANT | INDEPENDENCE, Jackson, MO | Pass | State |
| 2026-03-19 | LITTLE BLUE VALLEY SEWER DISTRICT - ATHERTON WASTEWATER TREATMENT PLANT | INDEPENDENCE, Jackson, MO | Pass | State |
| 2026-03-19 | CHEVRON USA INC, CHEVRON PRODUCTS COMPANY, PASCAGOULA REFINERY | PASCAGOULA, Jackson, MS | Pass | State |
| 2026-03-19 | CHEVRON USA INC, CHEVRON PRODUCTS COMPANY, PASCAGOULA REFINERY | PASCAGOULA, Jackson, MS | Pass | State |
| 2026-03-19 | ALUMINUM DYNAMICS, LLC | COLUMBUS, Lowndes, MS | Pass | State |
| 2026-03-19 | ALUMINUM DYNAMICS, LLC | COLUMBUS, Lowndes, MS | Pass | State |
| 2026-03-19 | ALUMINUM DYNAMICS, LLC | COLUMBUS, Lowndes, MS | Pass | State |
| 2026-03-19 | ALUMINUM DYNAMICS, LLC | COLUMBUS, Lowndes, MS | Pass | State |
| 2026-03-19 | SAINT-GOBAIN ADFORS AMERICA, INC. | LEXINGTON, Davidson, NC | Pass | State |
| 2026-03-19 | DUKE ENERGY CORPORATION LCTS | STANLEY, Lincoln, NC | Pass | State |
| 2026-03-19 | CARGILL LACTIC ACID PLANT | BLAIR, Washington, NE | N/A | State |
| 2026-03-19 | CARGILL LACTIC ACID PLANT | BLAIR, Washington, NE | Pass | State |
| 2026-03-19 | RJ CHIPPING ENTERPRISES, INC. | SHELBURNE, Coos, NH | Pass | State |
| 2026-03-19 | RUSTLER BREAKS AMINE TREATING FACILITY | MALAGA, Eddy, NM | Pass | State |
| 2026-03-19 | RUSTLER BREAKS AMINE TREATING FACILITY | MALAGA, Eddy, NM | Pass | State |
| 2026-03-19 | ACHILLES COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-03-19 | SUPREME COMPRESSOR STATION | MALAGA, Lea, NM | Pass | State |
| 2026-03-19 | HILCORP ENERGY-FAIRFIELD-TARKA PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
| 2026-03-19 | HILCORP ENERGY-FAIRFIELD-TARKA PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
| 2026-03-19 | HILCORP ENERGY-FAIRFIELD-TARKA PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
| 2026-03-19 | HILCORP ENERGY-FAIRFIELD-TARKA PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
| 2026-03-19 | HILCORP ENERGY-FAIRFIELD-TARKA PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
| 2026-03-19 | HILCORP ENERGY-FAIRFIELD-TARKA PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
| 2026-03-19 | MARKWEST HUMPHREYS COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-19 | MARKWEST HUMPHREYS COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-19 | MARKWEST HUMPHREYS COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-19 | MARKWEST HUMPHREYS COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-19 | MARKWEST HUMPHREYS COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-19 | MARKWEST HUMPHREYS COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-19 | MARKWEST HUMPHREYS COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-19 | MARKWEST HUMPHREYS COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-19 | MARKWEST HUMPHREYS COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-19 | MARKWEST HUMPHREYS COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-19 | MARKWEST HUMPHREYS COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-19 | MARKWEST HUMPHREYS COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-19 | MARKWEST HUMPHREYS COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-19 | MARKWEST HUMPHREYS COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-19 | MARKWEST HUMPHREYS COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-19 | MARKWEST HUMPHREYS COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-19 | MARKWEST HUMPHREYS COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-19 | MARKWEST HUMPHREYS COMPRESSOR STATION | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-19 | APPALACHIAN POWER CO, DRESDEN PLANT | DRESDEN, Muskingum, OH | Pass | State |
| 2026-03-19 | APPALACHIAN POWER CO, DRESDEN PLANT | DRESDEN, Muskingum, OH | Fail | State |
| 2026-03-19 | APPALACHIAN POWER CO, DRESDEN PLANT | DRESDEN, Muskingum, OH | Pass | State |
| 2026-03-19 | APPALACHIAN POWER CO, DRESDEN PLANT | DRESDEN, Muskingum, OH | Pass | State |
| 2026-03-19 | PROCTER & GAMBLE PAPER PROD CO/MEHOOPANY | MEHOOPANY, Wyoming, PA | Pass | State |
| 2026-03-19 | GELEST INC/FALLS TWP — high-priority violation on file | MORRISVILLE, Bucks, PA | Pass | State |
| 2026-03-19 | GELEST INC/FALLS TWP — high-priority violation on file | MORRISVILLE, Bucks, PA | Fail | State |
| 2026-03-19 | UGI PONDEROSA LLC/STURGIS PAD B COMP STA | LOCK HAVEN, Clinton, PA | Pass | State |
| 2026-03-19 | AMERESCO FEDERAL SOLUTIONS | AIKEN, Aiken, SC | Pass | State |
| 2026-03-19 | OLIVER'S CLEAN BURN LLC | BEAUFORT, Beaufort, SC | Pass | State |
| 2026-03-19 | CENTURY ALUMINUM OF SOUTH CAROLINA INC — high-priority violation on file | GOOSE CREEK, Berkeley, SC | Fail | State |
| 2026-03-19 | MILLIKEN & COMPANY - BLACKSBURG UTILITY CO-OP | BLACKSBURG, Cherokee, SC | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.