EPA Air · stack tests by year
Air-emissions stack tests in 2025
- 26,291Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
States, 2025
- California 5,390
- Ohio 2,213
- New Mexico 1,801
- Indiana 1,619
- Florida 1,419
- Wyoming 1,362
- Georgia 1,233
- Oklahoma 1,229
- Pennsylvania 951
- Missouri 768
- Alabama 693
- Mississippi 688
- Arkansas 619
- Iowa 500
- Colorado 405
- Michigan 387
- Texas 308
- North Carolina 275
- Illinois 264
- Washington 251
- Wisconsin 245
- Minnesota 238
- West Virginia 224
- Delaware 212
- South Carolina 210
- Kentucky 204
- Kansas 202
- Connecticut 178
- Utah 175
- Montana 174
- Virginia 170
- Tennessee 168
- Alaska 152
- Nebraska 145
- North Dakota 143
- Maine 131
- New York 124
- Louisiana 117
- Arizona 116
- Idaho 111
- Nevada 73
- New Hampshire 59
- Massachusetts 59
- Oregon 56
- Hawaii 53
- Maryland 51
- South Dakota 46
- Rhode Island 30
- District of Columbia 28
- Puerto Rico 14
- Vermont 4
- New Jersey 4
Other years
Air-emissions stack tests recorded in 2025
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2025-12-03 | LOUISVILLE MEDICAL CENTER STEAM PLANT | LOUISVILLE, Jefferson, KY | Pass | Local |
| 2025-12-03 | TENNESSEE GAS PIPELINE COMPANY LLC - COMPRESSOR STATION 40 500C1 | NATCHITOCHES, Natchitoches, LA | Pass | State |
| 2025-12-03 | DTE ELECTRIC COMPANY - MONROE POWER PLANT | MONROE, Monroe, MI | Pass | State |
| 2025-12-03 | MICHIGAN SUGAR COMPANY-CARO FACTORY — high-priority violation on file | CARO, Tuscola, MI | Pass | State |
| 2025-12-03 | CHOCTAW GENERATION LIMITED PARTNERSHIP, RED HILLS GENERATION FACILITY | ACKERMAN, Choctaw, MS | Pass | State |
| 2025-12-03 | CHOCTAW GENERATION LIMITED PARTNERSHIP, RED HILLS GENERATION FACILITY | ACKERMAN, Choctaw, MS | Pass | State |
| 2025-12-03 | CHEVRON USA INC, CHEVRON PRODUCTS COMPANY, PASCAGOULA REFINERY | PASCAGOULA, Jackson, MS | Pass | State |
| 2025-12-03 | SUNSHINE MILLS INC — high-priority violation on file | TUPELO, Lee, MS | Pass | State |
| 2025-12-03 | SUNSHINE MILLS INC — high-priority violation on file | TUPELO, Lee, MS | Pass | State |
| 2025-12-03 | SUNSHINE MILLS INC — high-priority violation on file | TUPELO, Lee, MS | Pass | State |
| 2025-12-03 | NET-ZERO RICHARDTON, LLC - RICHARDTON ETHANOL PLANT - AQ | RICHARDTON, Stark, ND | N/A | State |
| 2025-12-03 | TANGO COMPRESSOR STATION | LA HUERTA, Eddy, NM | Pass | State |
| 2025-12-03 | TANGO COMPRESSOR STATION | LA HUERTA, Eddy, NM | Pass | State |
| 2025-12-03 | CATALINA COMPRESSOR STATION | LA HUERTA, Eddy, NM | Pass | State |
| 2025-12-03 | CATALINA COMPRESSOR STATION | LA HUERTA, Eddy, NM | Pass | State |
| 2025-12-03 | LEA UNIT 14-11 CTB | MONUMENT, Lea, NM | Fail | State |
| 2025-12-03 | XTO ENERGY INC - MILLER UNIT PAD | BELLAIRE, Belmont, OH | Pass | State |
| 2025-12-03 | XTO ENERGY INC - MILLER UNIT PAD | BELLAIRE, Belmont, OH | Pass | State |
| 2025-12-03 | XTO ENERGY INC - MILLER UNIT PAD | BELLAIRE, Belmont, OH | Pass | State |
| 2025-12-03 | HF SINCLAIR TULSA REFINING LLC / TULSA REFINERY EAST — high-priority violation on file | TULSA, Tulsa, OK | Pass | State |
| 2025-12-03 | ENERGY DEVS MORGANTOWN LLC/CAERNARVON TWP | MORGANTOWN, Berks, PA | Pass | State |
| 2025-12-03 | EQUITRANS LP/JEFFERSON COMP STA | LIPPINCOTT, Greene, PA | Pass | State |
| 2025-12-03 | NFG MIDSTREAM COVINGTON LLC/KINNAN 845 WELL PAD | MIDDLEBURY, Tioga, PA | Pass | State |
| 2025-12-03 | NFG MIDSTREAM COVINGTON LLC/KEENEYVILLE COMP STA | MIDDLEBURY CTR, Tioga, PA | Pass | State |
| 2025-12-03 | BROWN UNIVERSITY | PROVIDENCE, Providence, RI | Fail | State |
| 2025-12-03 | WATEREE STATION | EASTOVER, Richland, SC | Pass | State |
| 2025-12-03 | CRUCIBLE ZINC, LLC — high-priority violation on file | CLARKSVILLE, Montgomery, TN | Fail | State |
| 2025-12-03 | TENNESSEE OPERATIONS OF EASTMAN CHEMICAL COMPANY — high-priority violation on file | KINGSPORT, Sullivan, TN | Pass | State |
| 2025-12-03 | PACIFICORP HUNTER | UTAH, Undetermined, UT | Pass | State |
| 2025-12-03 | ALIGNED DATA CENTERS IAD03 | STERLING, Loudoun, VA | Pass | State |
| 2025-12-03 | VAUGHAN-BASSETT FURNITURE COMPANY | GALAX, Galax (city), VA | Pass | State |
| 2025-12-03 | VAUGHAN-BASSETT FURNITURE COMPANY | GALAX, Galax (city), VA | Pass | State |
| 2025-12-03 | ANR PIPELINE CO - JANESVILLE COMPRESSOR | JANESVILLE, Rusk, WI | Pass | State |
| 2025-12-02 | HILCORP ALASKA, LLC / TYONEK PLATFORM | KENAI, Kenai Peninsula, AK | Pass | State |
| 2025-12-02 | STEEL DUST RECYCLING LLC | MILLPORT, Lamar, AL | Pass | State |
| 2025-12-02 | WARRIOR MET COAL GAS, LLC | BROOKWOOD, Tuscaloosa, AL | Pass | State |
| 2025-12-02 | DESOTO GATHERING COMPANY, LLC - STEELHEAD CPF-2 | CLINTON, Van Buren, AR | Pass | State |
| 2025-12-02 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-12-02 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-12-02 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-12-02 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-12-02 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-12-02 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-12-02 | KIMBERLY-CLARK CORPORATION, NEW MILFORD MILL — high-priority violation on file | NEW MILFORD, Litchfield, CT | Pass | State |
| 2025-12-02 | ALGONQUIN GAS TRANSMISSION, LLC - CROMWELL COMPRESSOR STATION | CROMWELL, Middlesex, CT | Pass | State |
| 2025-12-02 | ALGONQUIN GAS TRANSMISSION, LLC - CROMWELL COMPRESSOR STATION | CROMWELL, Middlesex, CT | Pass | State |
| 2025-12-02 | QUIKRETE CONSTRUCTION MATERIALS, LLC | NEWBERRY, Alachua, FL | Pass | State |
| 2025-12-02 | QUIKRETE CONSTRUCTION MATERIALS, LLC | NEWBERRY, Alachua, FL | Pass | State |
| 2025-12-02 | QUIKRETE CONSTRUCTION MATERIALS, LLC | NEWBERRY, Alachua, FL | Pass | State |
| 2025-12-02 | SUGAR CANE GROWERS CO-OP | BELLE GLADE, Palm Beach, FL | Pass | State |
| 2025-12-02 | SUGAR CANE GROWERS CO-OP | BELLE GLADE, Palm Beach, FL | Pass | State |
| 2025-12-02 | SUGAR CANE GROWERS CO-OP | BELLE GLADE, Palm Beach, FL | Pass | State |
| 2025-12-02 | SUGAR CANE GROWERS CO-OP | BELLE GLADE, Palm Beach, FL | Pass | State |
| 2025-12-02 | SUGAR CANE GROWERS CO-OP | BELLE GLADE, Palm Beach, FL | Pass | State |
| 2025-12-02 | SUGAR CANE GROWERS CO-OP | BELLE GLADE, Palm Beach, FL | Pass | State |
| 2025-12-02 | SUGAR CANE GROWERS CO-OP | BELLE GLADE, Palm Beach, FL | Pass | State |
| 2025-12-02 | BREITBURN OPERATING LP — high-priority violation on file | JAY, Santa Rosa, FL | Pass | State |
| 2025-12-02 | SOUTHERN LNG CO., LLC - ELBA ISLAND LNG TERMINAL - (KINDER MORGAN, INC.) — high-priority violation on file | SAVANNAH, Chatham, GA | Pass | State |
| 2025-12-02 | SOUTHERN LNG CO., LLC - ELBA ISLAND LNG TERMINAL - (KINDER MORGAN, INC.) — high-priority violation on file | SAVANNAH, Chatham, GA | Pass | State |
| 2025-12-02 | PIEDMONT GREEN POWER, LLC | BARNESVILLE, Lamar, GA | Pass | State |
| 2025-12-02 | PIEDMONT GREEN POWER, LLC | BARNESVILLE, Lamar, GA | Pass | State |
| 2025-12-02 | PIEDMONT GREEN POWER, LLC | BARNESVILLE, Lamar, GA | Pass | State |
| 2025-12-02 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | IOWA FALLS, Hardin, IA | Pass | State |
| 2025-12-02 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | IOWA FALLS, Hardin, IA | Pass | State |
| 2025-12-02 | NORTH SHORE GAS CO | LIBERTYVILLE, Lake, IL | Pass | State |
| 2025-12-02 | NORTH SHORE GAS CO | LIBERTYVILLE, Lake, IL | Pass | State |
| 2025-12-02 | NORTH SHORE GAS CO | LIBERTYVILLE, Lake, IL | Pass | State |
| 2025-12-02 | NORTH SHORE GAS CO | LIBERTYVILLE, Lake, IL | Pass | State |
| 2025-12-02 | NORTH SHORE GAS CO | LIBERTYVILLE, Lake, IL | Pass | State |
| 2025-12-02 | US MINERALS | COFFEEN, Montgomery, IL | Fail | State |
| 2025-12-02 | AUGUSTA MUN. POWER PLANT #2 (AIR) — high-priority violation on file | AUGUSTA, Butler, KS | Pass | State |
| 2025-12-02 | CRNF - COFFEYVILLE (AIR) | COFFEYVILLE, Montgomery, KS | Pass | State |
| 2025-12-02 | DAVIESS CO FISCAL COURT | OWENSBORO, Daviess, KY | Pass | State |
| 2025-12-02 | HARBISONWALKER INTERNATIONAL, INC. | SOUTH SHORE, Greenup, KY | Pass | State |
| 2025-12-02 | HARDIN CO CONTAINED LANDFILL-AUDUBON TRACE | ELIZABETHTOWN, Hardin, KY | Pass | State |
| 2025-12-02 | TENNESSEE VALLEY AUTHORITY (TVA) - SHAWNEE FOSSIL PLANT | WEST PADUCAH, McCracken, KY | Pass | State |
| 2025-12-02 | LOUISVILLE MEDICAL CENTER STEAM PLANT | LOUISVILLE, Jefferson, KY | Pass | Local |
| 2025-12-02 | LOUISVILLE MEDICAL CENTER STEAM PLANT | LOUISVILLE, Jefferson, KY | Pass | Local |
| 2025-12-02 | HOLLY COMMON POINT #3 COMPRESSOR STATION | GRAND CANE, De Soto, LA | Pass | State |
| 2025-12-02 | UNIVERSITY OF MARYLAND MEDICAL CENTER | BALTIMORE, Baltimore (city), MD | Pass | State |
| 2025-12-02 | DOW SILICONES CORPORATION | MIDLAND, Midland, MI | Pass | State |
| 2025-12-02 | MICHIGAN SUGAR COMPANY - BAY CITY — high-priority violation on file | BAY CITY, Bay, MI | Pass | State |
| 2025-12-02 | QUESTSPECIALTY LLC - MYRTLE | WAYNE, Wayne, MI | Pass | State |
| 2025-12-02 | CANTON RENEWABLES LLC | CANTON, Wayne, MI | Pass | State |
| 2025-12-02 | SAPPI CLOQUET LLC | CLOQUET, Carlton, MN | Pass | State |
| 2025-12-02 | GOPHER RESOURCE LLC | EAGAN, Dakota, MN | Pass | State |
| 2025-12-02 | LOUISIANA-PACIFIC CORP - TWO HARBORS | TWO HARBORS, Lake, MN | Pass | State |
| 2025-12-02 | AMERICAN CRYSTAL SUGAR - CROOKSTON | CROOKSTON, Polk, MN | Pass | State |
| 2025-12-02 | MET COUNCIL METROPOLITAN WATER RESOURCE RECOVERY FACILITY | SAINT PAUL, Ramsey, MN | Pass | State |
| 2025-12-02 | XCEL ENERGY - ALLEN S KING GENERATING PLANT | BAYPORT, Washington, MN | Pass | State |
| 2025-12-02 | SOUTHERN STAR CENTRAL PIPELINE-PECULIAR | PECULIAR, Cass, MO | Pass | State |
| 2025-12-02 | SUNSHINE MILLS INC — high-priority violation on file | TUPELO, Lee, MS | Pass | State |
| 2025-12-02 | SAND DUNES SOUTH CORRIDOR CGL STATION NO1 | MALAGA, Eddy, NM | Pass | State |
| 2025-12-02 | CATALINA COMPRESSOR STATION | LA HUERTA, Eddy, NM | Pass | State |
| 2025-12-02 | CATALINA COMPRESSOR STATION | LA HUERTA, Eddy, NM | Pass | State |
| 2025-12-02 | CATALINA COMPRESSOR STATION | LA HUERTA, Eddy, NM | Pass | State |
| 2025-12-02 | CATALINA COMPRESSOR STATION | LA HUERTA, Eddy, NM | Pass | State |
| 2025-12-02 | APOLLO A CTB | JAL, Lea, NM | Pass | State |
| 2025-12-02 | APOLLO C CTB | JAL, Lea, NM | Pass | State |
| 2025-12-02 | LOVELOCK COMPRESSOR STATION #6 | LOVELOCK, Pershing, NV | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.