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 |
|---|---|---|---|---|
| 2025-09-24 | MODESTO IRRIGATION DISTRICT | RIPON, San Joaquin, CA | Pass | Local |
| 2025-09-24 | MODESTO IRRIGATION DISTRICT | RIPON, San Joaquin, CA | Pass | Local |
| 2025-09-24 | MODESTO IRRIGATION DISTRICT | RIPON, San Joaquin, CA | Pass | Local |
| 2025-09-24 | MODESTO IRRIGATION DISTRICT | RIPON, San Joaquin, CA | Pass | Local |
| 2025-09-24 | MODESTO IRRIGATION DISTRICT | RIPON, San Joaquin, CA | Pass | Local |
| 2025-09-24 | MODESTO IRRIGATION DISTRICT | RIPON, San Joaquin, CA | Pass | Local |
| 2025-09-24 | HIGHPOINT - PAPPENHEIM 6-62-23 | KERSEY 14.2 MI. NE OF, Weld, CO | Pass | State |
| 2025-09-24 | PDC ENERGY - POSTLE IC WEST | MEAD AREA, Weld, CO | Pass | State |
| 2025-09-24 | CITY OF WATERBURY WPCF | WATERBURY, New Haven, CT | Pass | State |
| 2025-09-24 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pass | State |
| 2025-09-24 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pass | State |
| 2025-09-24 | CEMEX CONSTRUCTION MATERIALS FL. LLC. | MIAMI, Miami-Dade, FL | Pass | State |
| 2025-09-24 | CEMEX CONSTRUCTION MATERIALS FL. LLC. | MIAMI, Miami-Dade, FL | Pass | State |
| 2025-09-24 | KRAFT HEINZ FOODS COMPANY | JACKSONVILLE, Duval, FL | Pass | State |
| 2025-09-24 | DART CONTAINER CORPORATION OF FLORIDA | PLANT CITY, Hillsborough, FL | Pass | State |
| 2025-09-24 | INTERNATIONAL PAPER COMPANY - PORT WENTWORTH MILL | PORT WENTWORTH, Chatham, GA | Pass | State |
| 2025-09-24 | INTERNATIONAL PAPER COMPANY - PORT WENTWORTH MILL | PORT WENTWORTH, Chatham, GA | Pass | State |
| 2025-09-24 | LJR FOREST PRODUCTS | SWAINSBORO, Emanuel, GA | Pass | State |
| 2025-09-24 | LJR FOREST PRODUCTS | SWAINSBORO, Emanuel, GA | Pass | State |
| 2025-09-24 | LJR FOREST PRODUCTS | SWAINSBORO, Emanuel, GA | Pass | State |
| 2025-09-24 | LJR FOREST PRODUCTS | SWAINSBORO, Emanuel, GA | Pass | State |
| 2025-09-24 | LJR FOREST PRODUCTS | SWAINSBORO, Emanuel, GA | Pass | State |
| 2025-09-24 | LJR FOREST PRODUCTS | SWAINSBORO, Emanuel, GA | N/A | State |
| 2025-09-24 | LJR FOREST PRODUCTS | SWAINSBORO, Emanuel, GA | Pass | State |
| 2025-09-24 | LJR FOREST PRODUCTS | SWAINSBORO, Emanuel, GA | N/A | State |
| 2025-09-24 | LJR FOREST PRODUCTS | SWAINSBORO, Emanuel, GA | N/A | State |
| 2025-09-24 | GA POWER CO. - PLANT SCHERER | JULIETTE, Monroe, GA | Pass | State |
| 2025-09-24 | GA POWER CO. - PLANT SCHERER | JULIETTE, Monroe, GA | Pass | State |
| 2025-09-24 | GA POWER CO. - PLANT SCHERER | JULIETTE, Monroe, GA | Pass | State |
| 2025-09-24 | GA POWER CO. - PLANT SCHERER | JULIETTE, Monroe, GA | Pass | State |
| 2025-09-24 | GA POWER CO. - PLANT SCHERER | JULIETTE, Monroe, GA | Pass | State |
| 2025-09-24 | INGREDION INCORPORATED | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-09-24 | KOOTENAI RENEWABLE ENERGY LLC - FIGHTING CREEK | COEUR D'ALENE, Kootenai, ID | Pass | State |
| 2025-09-24 | BENNETT LUMBER PRODUCTS PRINCETON | PRINCETON, Latah, ID | Pass | State |
| 2025-09-24 | CEA DAIRY RNG IDAHO LLC - MURTAUGH | MURTAUGH, Twin Falls, ID | Pass | State |
| 2025-09-24 | HARRISON STEEL CASTINGS COMPANY — high-priority violation on file | ATTICA, Fountain, IN | Pass | State |
| 2025-09-24 | HARRISON STEEL CASTINGS COMPANY — high-priority violation on file | ATTICA, Fountain, IN | Pass | State |
| 2025-09-24 | HARRISON STEEL CASTINGS COMPANY — high-priority violation on file | ATTICA, Fountain, IN | Pass | State |
| 2025-09-24 | CWA AUTHORITY INC BELMONT ADV WASTEWATER TREATMENT PLANT | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-09-24 | CWA AUTHORITY INC BELMONT ADV WASTEWATER TREATMENT PLANT | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-09-24 | CWA AUTHORITY INC BELMONT ADV WASTEWATER TREATMENT PLANT | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-09-24 | INDIANA MICHIGAN POWER COMPANY DBA AEP ROCKPORT PLANT | ROCKPORT, Spencer, IN | Pass | State |
| 2025-09-24 | INDIANA MICHIGAN POWER COMPANY DBA AEP ROCKPORT PLANT | ROCKPORT, Spencer, IN | Pass | State |
| 2025-09-24 | INDIANA MICHIGAN POWER COMPANY DBA AEP ROCKPORT PLANT | ROCKPORT, Spencer, IN | Pass | State |
| 2025-09-24 | VALERO RENEWABLE FUELS COMPANY LLC DBA VALERO BLUFFTON PLANT | BLUFFTON, Wells, IN | Pass | State |
| 2025-09-24 | VALERO RENEWABLE FUELS COMPANY LLC DBA VALERO BLUFFTON PLANT | BLUFFTON, Wells, IN | Pass | State |
| 2025-09-24 | VALERO RENEWABLE FUELS COMPANY LLC DBA VALERO BLUFFTON PLANT | BLUFFTON, Wells, IN | Pass | State |
| 2025-09-24 | VALERO RENEWABLE FUELS COMPANY LLC DBA VALERO BLUFFTON PLANT | BLUFFTON, Wells, IN | Pass | State |
| 2025-09-24 | TOYOTA MOTOR MANUFACTURING, KENTUCKY | GEORGETOWN (SCOTT), Scott, KY | Pending | State |
| 2025-09-24 | AMRIZE — high-priority violation on file | HAGERSTOWN, Washington, MD | Pass | State |
| 2025-09-24 | DTE ELECTRIC COMPANY - GREENWOOD ENERGY CENTER | KENOCKEE, St. Clair, MI | Pass | State |
| 2025-09-24 | BREMBO NORTH AMERICA, INC. — high-priority violation on file | HOMER, Calhoun, MI | Pass | State |
| 2025-09-24 | DTE ELECTRIC COMPANY - RENAISSANCE POWER PLANT | CARSON CITY, Montcalm, MI | Pass | State |
| 2025-09-24 | USG INTERIORS LLC | RED WING, Goodhue, MN | Pass | State |
| 2025-09-24 | RICHMOND COUNTY TRANSFER FACILITY (ACI) | ROCKINGHAM, Richmond, NC | Pending | State |
| 2025-09-24 | SIOUXLAND ETHANOL LLC — high-priority violation on file | JACKSON, Dakota, NE | N/A | State |
| 2025-09-24 | CARGILL INC — high-priority violation on file | BLAIR, Washington, NE | Pass | State |
| 2025-09-24 | LONGWOOD - STATELINE COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-09-24 | LONGWOOD - STATELINE COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-09-24 | RIVERBEND 11-14 CTB 1 | MALAGA, Eddy, NM | Pass | State |
| 2025-09-24 | FRAC CAT COMPRESSOR STATION | LOVING, Lea, NM | Pass | State |
| 2025-09-24 | ALAMO COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-09-24 | ARENA ROJA 28 CTB 2 | JAL, Lea, NM | Pass | State |
| 2025-09-24 | S ESCAVADA UT NO 345H | NAGEEZI, Sandoval, NM | Pass | State |
| 2025-09-24 | W LYBROOK REMOTE FACILITY NO1 — high-priority violation on file | NAGEEZI, San Juan, NM | Pass | State |
| 2025-09-24 | W LYBROOK REMOTE FACILITY NO1 — high-priority violation on file | NAGEEZI, San Juan, NM | Pass | State |
| 2025-09-24 | COMPRESSOR STATION 254 | RIDERS MILLS, Columbia, NY | Pass | State |
| 2025-09-24 | BUCKEYE TERMINALS LLC - COLUMBUS SOUTH TERMINAL | COLUMBUS, Franklin, OH | Pass | State |
| 2025-09-24 | ASCENT RESOURCES - UTICA LLC - TRUCHAN NE WHL BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-09-24 | ASCENT RESOURCES - UTICA LLC - TRUCHAN NE WHL BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-09-24 | ASCENT RESOURCES - UTICA LLC - TRUCHAN NE WHL BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-09-24 | MANE, INC. — high-priority violation on file | LEBANON, Warren, OH | Fail | State |
| 2025-09-24 | VITRO MEADVILLE FLAT GLASS MEADVILLE PLT/CRAWFORD | COCHRANTON, Crawford, PA | Pass | State |
| 2025-09-24 | ARCONIC US LLC/LANCASTER — high-priority violation on file | LANCASTER, Lancaster, PA | Pass | State |
| 2025-09-24 | EASTERN GAS TRANS & STORAGE INC/FINNEFROCK STA | RENOVO, Clinton, PA | Pass | State |
| 2025-09-24 | REWORLD DELAWARE VALLEY LP/DELAWARE VALLEY RES REC — high-priority violation on file | CHESTER, Delaware, PA | Pass | State |
| 2025-09-24 | EQM GATHERING OPCO LLC/BLUE MOON COMP STA | DAISYTOWN, Washington, PA | Pass | State |
| 2025-09-24 | HOUSENICK, J. PAD 1 | MONTROSE, Susquehanna, PA | Pass | State |
| 2025-09-24 | WARRINER, R. PAD 2 | MONTROSE, Susquehanna, PA | Pass | State |
| 2025-09-24 | AMERESCO FEDERAL SOLUTIONS | AIKEN, Aiken, SC | Pass | State |
| 2025-09-24 | NUCOR CORPORATION - DARLINGTON PLANT | DARLINGTON, Darlington, SC | Pass | State |
| 2025-09-24 | PARR COMBUSTION TURBINE FACILITY | JENKINSVILLE, Fairfield, SC | Pass | State |
| 2025-09-24 | FAIRFIELD ROAD RECYCLING | COLUMBIA, Richland, SC | Pass | State |
| 2025-09-24 | SOLVENTUM US LLC — high-priority violation on file | BROOKINGS, Brookings, SD | Pass | State |
| 2025-09-24 | PACIFICORP LAKESIDE (SUMMIT VINEYARD) | VINEYARD, Utah, UT | Pass | State |
| 2025-09-24 | PACIFICORP LAKESIDE (SUMMIT VINEYARD) | VINEYARD, Utah, UT | Pass | State |
| 2025-09-24 | WAUPACA FOUNDRY, INC.-PLANT 4 | MARINETTE, Marinette, WI | Pass | State |
| 2025-09-24 | WAUPACA FOUNDRY INC - PLANT 1 | WAUPACA, Waushara, WI | Pass | State |
| 2025-09-24 | WAUPACA FOUNDRY INC - PLANT 2 & 3 | WAUPACA, Waushara, WI | Pass | State |
| 2025-09-24 | WESTLAKE NATRIUM LLC, WESTLAKE NATRIUM | PROCTOR, Marshall, WV | Pass | State |
| 2025-09-24 | WILLIAMS OHIO VALLEY MIDSTREAM LLC, OAK GROVE | MOUNDSVILLE, Marshall, WV | Pass | State |
| 2025-09-24 | APPALACHIA MIDSTREAM SERVICES, L.L.C., PIONEER FACILITY | WHEELING, Ohio, WV | Pass | State |
| 2025-09-24 | WEYERHAEUSER COMPANY, BUCKHANNON | BUCKHANNON, Upshur, WV | Pass | State |
| 2025-09-24 | ANTELOPE HILLS COMPRESSOR STATION (EOG RESOURCES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-09-24 | ANTELOPE HILLS COMPRESSOR STATION (EOG RESOURCES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-09-24 | ANTELOPE HILLS COMPRESSOR STATION (EOG RESOURCES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-09-24 | ANTELOPE HILLS COMPRESSOR STATION (EOG RESOURCES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-09-24 | ANTELOPE HILLS COMPRESSOR STATION (EOG RESOURCES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-09-24 | ANTELOPE HILLS COMPRESSOR STATION (EOG RESOURCES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-09-24 | ANTELOPE HILLS COMPRESSOR STATION (EOG RESOURCES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.