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 |
|---|---|---|---|---|
| 2025-11-05 | SEVERUS COMPRESSOR STATION | MONUMENT, Lea, NM | Pass | State |
| 2025-11-05 | EIDER COMPRESSOR STATION | MALAGA, Lea, NM | Pass | State |
| 2025-11-05 | NITRO COMPRESSOR STATION | EUNICE, Lea, NM | Pass | State |
| 2025-11-05 | NITRO COMPRESSOR STATION | EUNICE, Lea, NM | Pass | State |
| 2025-11-05 | TITAN COMPRESSOR STATION | MALAGA, Lea, NM | Pass | State |
| 2025-11-05 | RED TANK 10-3 CTB | MALAGA, Lea, NM | Pass | State |
| 2025-11-05 | TRISTE DRAW 36-25 CTB | MALAGA, Lea, NM | Incomplete | State |
| 2025-11-05 | BROADWAY HMA PLANT | ALBUQUERQUE, Bernalillo, NM | Pass | Local |
| 2025-11-05 | AMRIZE RAVENA FACILITY | COEYMANS, Albany, NY | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | INR MIDSTREAM, LLC - LONG COMPRESSOR STATION | OHIO, Undetermined, OH | Pass | State |
| 2025-11-05 | CHARLES F. JERGENS CONSTRUCTION INC. PORTABLE | DAYTON, Montgomery, OH | Pass | State |
| 2025-11-05 | CHROME DEPOSIT CORP. | AKRON, Summit, OH | Pass | State |
| 2025-11-05 | ONEOK FIELD SERVICES CO LLC / GEARY BASE SALES COMPRESSOR STATION | GEARY, Blaine, OK | Pass | State |
| 2025-11-05 | GRAFTECH USA LLC/ST MARYS | SAINT MARYS, Elk, PA | Pass | State |
| 2025-11-05 | ENERGY DEVS HONEY BROOK LLC/CAERNARVON TWP | NARVON, Lancaster, PA | Pass | State |
| 2025-11-05 | SENECA RESOURCES CO LLC/SRC COMP STA | MT. JEWETT, McKean, PA | Pass | State |
| 2025-11-05 | MARKWEST LIBERTY MIDST & RESOURCES/THREE BROTHERS COMP STA | BURGETTSTOWN, Washington, PA | Pass | State |
| 2025-11-05 | UGI AUBURN GATHERING LLC/ MANNING COMPRESSOR LNG STA | MESHOPPEN, Wyoming, PA | Pass | State |
| 2025-11-05 | PA GEN ENERGY CO LLC/COP TRACT 596 PAD B | ROARING BRANCH, Tioga, PA | Pass | State |
| 2025-11-05 | BASF METALS LLC | SENECA, Oconee, SC | Pending | State |
| 2025-11-05 | ROGERS GROUP INC - LYMAN ASPHALT PLANT | INMAN, Spartanburg, SC | Pass | State |
| 2025-11-05 | ABERDEEN ENERGY, LLC — high-priority violation on file | MINA, Edmunds, SD | Pass | State |
| 2025-11-05 | TENNESSEE OPERATIONS OF EASTMAN CHEMICAL COMPANY — high-priority violation on file | KINGSPORT, Sullivan, TN | Pass | State |
| 2025-11-05 | COMPASS MINERALS | UTAH, Undetermined, UT | Pass | State |
| 2025-11-05 | NAVAL SUPPORT FACILITY, DAHLGREN | DAHLGREN, King George, VA | Pass | State |
| 2025-11-05 | CEDAR GROVE COMPOSTING, INC | EVERETT, Snohomish, WA | Pass | Local |
| 2025-11-05 | BOEING DEVELOPMENTAL CENTER | TUKWILA, King, WA | Pass | Local |
| 2025-11-05 | MASTERMOLD LLC PLT 3 MAUSTON | MAUSTON, Juneau, WI | Pass | State |
| 2025-11-05 | WAUPACA FOUNDRY INC - PLANT 1 | WAUPACA, Waushara, WI | Pass | State |
| 2025-11-05 | COLUMBIA GAS TRANSMISSION, LLC, LOST RIVER | MATHIAS, Hardy, WV | Pass | State |
| 2025-11-05 | KINGSFORD MANUFACTURING COMPANY, PARSONS | PARSONS, Tucker, WV | Pass | State |
| 2025-11-05 | LARAMIE RIVER STATION (BASIN ELECTRIC POWER COOPERATIVE) — high-priority violation on file | WHEATLAND, Platte, WY | Pass | State |
| 2025-11-05 | LARAMIE RIVER STATION (BASIN ELECTRIC POWER COOPERATIVE) — high-priority violation on file | WHEATLAND, Platte, WY | Pass | State |
| 2025-11-04 | OUTOKUMPU STAINLESS USA, LLC | CALVERT, Mobile, AL | Pass | State |
| 2025-11-04 | SOUTHERN NATURAL GAS | REFORM, Pickens, AL | Pass | State |
| 2025-11-04 | SOUTHERN NATURAL GAS | REFORM, Pickens, AL | Pass | State |
| 2025-11-04 | SOUTHERN NATURAL GAS | REFORM, Pickens, AL | Pass | State |
| 2025-11-04 | SANDERS LEAD CO | TROY, Pike, AL | Pass | State |
| 2025-11-04 | SANDERS LEAD CO | TROY, Pike, AL | Pass | State |
| 2025-11-04 | SANDERS LEAD CO | TROY, Pike, AL | Pass | State |
| 2025-11-04 | DRUMMOND COMPANY, INC. (ABC COKE) | BIRMINGHAM, Jefferson, AL | Pending | Local |
| 2025-11-04 | DESOTO GATHERING COMPANY, LLC - SOUTH RAINBOW CPF-4 | CENTER RIDGE, Conway, AR | Pass | State |
| 2025-11-04 | DESOTO GATHERING COMPANY, LLC - STURGEON CPF-3 | CENTER RIDGE, Conway, AR | Pass | State |
| 2025-11-04 | ET GATHERING & PROCESSING LLC. - EAST CHISMVILLE COMPRESSOR STATION | BOONEVILLE, Logan, AR | Pass | State |
| 2025-11-04 | ET GATHERING & PROCESSING LLC. - MAGAZINE COMPRESSOR STATION | BOONEVILLE, Logan, AR | Pass | State |
| 2025-11-04 | BLYTHE ENERGY LLC (FPL FLORIDA POWER) | BLYTHE, Riverside, CA | Pass | Local |
| 2025-11-04 | ALON BAKERSFIELD REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-04 | ALON BAKERSFIELD REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-04 | ALON BAKERSFIELD REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-04 | ALON BAKERSFIELD REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-04 | ALON BAKERSFIELD REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-04 | DELICATO VINEYARDS | MANTECA, San Joaquin, CA | Pass | Local |
| 2025-11-04 | DELICATO VINEYARDS | MANTECA, San Joaquin, CA | Pass | Local |
| 2025-11-04 | DELICATO VINEYARDS | MANTECA, San Joaquin, CA | Pass | Local |
| 2025-11-04 | DELICATO VINEYARDS | MANTECA, San Joaquin, CA | Pass | Local |
| 2025-11-04 | DELICATO VINEYARDS | MANTECA, San Joaquin, CA | Pass | Local |
| 2025-11-04 | DELICATO VINEYARDS | MANTECA, San Joaquin, CA | Pass | Local |
| 2025-11-04 | LARAMIE ENERGY - CONN CREEK GAS — high-priority violation on file | PARACHUTE 10.1 MI. W OF, Garfield, CO | Pass | State |
| 2025-11-04 | WYOMING INTERSTATE - SNAKE RIVER C.S. | CRAIG 37.2 MI. NW OF, Moffat, CO | Pass | State |
| 2025-11-04 | WYOMING INTERSTATE - SNAKE RIVER C.S. | CRAIG 37.2 MI. NW OF, Moffat, CO | Pass | State |
| 2025-11-04 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pass | State |
| 2025-11-04 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pass | State |
| 2025-11-04 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pass | State |
| 2025-11-04 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pass | State |
| 2025-11-04 | OLEANDER POWER PROJECT, LP | COCOA, Brevard, FL | Pass | State |
| 2025-11-04 | OLEANDER POWER PROJECT, LP | COCOA, Brevard, FL | Pass | State |
| 2025-11-04 | CENTER POINT TERMINAL J&W, LLC | JACKSONVILLE, Duval, FL | Pass | State |
| 2025-11-04 | CITY OF TAMPA | TAMPA, Hillsborough, FL | Pass | State |
| 2025-11-04 | CITY OF TAMPA | TAMPA, Hillsborough, FL | Pass | State |
| 2025-11-04 | CITY OF TAMPA | TAMPA, Hillsborough, FL | Pass | State |
| 2025-11-04 | CITY OF TAMPA | TAMPA, Hillsborough, FL | Pass | State |
| 2025-11-04 | CITY OF TAMPA | TAMPA, Hillsborough, FL | Pass | State |
| 2025-11-04 | CITY OF TAMPA | TAMPA, Hillsborough, FL | Pass | State |
| 2025-11-04 | CITY OF TAMPA | TAMPA, Hillsborough, FL | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.