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 |
|---|---|---|---|---|
| 2025-09-25 | STEEL DYNAMICS, INC. FLAT ROLL GROUP, BUTLER DIVISION — high-priority violation on file | BUTLER, DeKalb, IN | Pass | State |
| 2025-09-25 | STEEL DYNAMICS, INC. FLAT ROLL GROUP, BUTLER DIVISION — high-priority violation on file | BUTLER, DeKalb, IN | Pass | State |
| 2025-09-25 | STEEL DYNAMICS, INC. FLAT ROLL GROUP, BUTLER DIVISION — high-priority violation on file | BUTLER, DeKalb, IN | Pass | State |
| 2025-09-25 | STEEL DYNAMICS, INC. FLAT ROLL GROUP, BUTLER DIVISION — high-priority violation on file | BUTLER, DeKalb, IN | Pass | State |
| 2025-09-25 | ROCHESTER METAL PRODUCTS CORPORATION — high-priority violation on file | ROCHESTER, Fulton, IN | Pass | State |
| 2025-09-25 | ROCHESTER METAL PRODUCTS CORPORATION — high-priority violation on file | ROCHESTER, Fulton, IN | Pass | State |
| 2025-09-25 | ROCHESTER METAL PRODUCTS CORPORATION — high-priority violation on file | ROCHESTER, Fulton, IN | Pass | State |
| 2025-09-25 | VALERO RENEWABLE FUELS COMPANY LLC DBA VALERO BLUFFTON PLANT | BLUFFTON, Wells, IN | Pass | State |
| 2025-09-25 | VALERO RENEWABLE FUELS COMPANY LLC DBA VALERO BLUFFTON PLANT | BLUFFTON, Wells, IN | Pass | State |
| 2025-09-25 | VALERO RENEWABLE FUELS COMPANY LLC DBA VALERO BLUFFTON PLANT | BLUFFTON, Wells, IN | Pass | State |
| 2025-09-25 | VALERO RENEWABLE FUELS COMPANY LLC DBA VALERO BLUFFTON PLANT | BLUFFTON, Wells, IN | Pass | State |
| 2025-09-25 | DOMTAR PAPER CO LLC - HAWESVILLE OPERATIONS | HAWESVILLE, Hancock, KY | Pass | State |
| 2025-09-25 | MONTGOMERY COUNTY RRF — high-priority violation on file | DICKERSON, Montgomery, MD | Fail | State |
| 2025-09-25 | MONTGOMERY COUNTY RRF — high-priority violation on file | DICKERSON, Montgomery, MD | Pass | State |
| 2025-09-25 | HURON CASTING, INC (BLUE DIAMOND STEEL CASTING) | PIGEON, Huron, MI | Pass | State |
| 2025-09-25 | LIGHTNING RENEWABLES - LEMONS EAST | DEXTER, Stoddard, MO | Pass | State |
| 2025-09-25 | LIGHTNING RENEWABLES - LEMONS EAST | DEXTER, Stoddard, MO | Pass | State |
| 2025-09-25 | LIGHTNING RENEWABLES - LEMONS EAST | DEXTER, Stoddard, MO | Pass | State |
| 2025-09-25 | LIGHTNING RENEWABLES - LEMONS EAST | DEXTER, Stoddard, MO | Fail | State |
| 2025-09-25 | CII METHANE MANAGEMENT IV, LLC | SMITHFIELD, Johnston, NC | Pending | State |
| 2025-09-25 | GREAT RIVER ENERGY (GRE) - SPIRITWOOD STATION - AQ | SPIRITWOOD, Stutsman, ND | Pass | State |
| 2025-09-25 | NEBRASKA CORN PROCESSING LLC — high-priority violation on file | CAMBRIDGE, Furnas, NE | N/A | State |
| 2025-09-25 | NEBRASKA CORN PROCESSING LLC — high-priority violation on file | CAMBRIDGE, Furnas, NE | Pass | State |
| 2025-09-25 | KAAPA ETHANOL LLC | MINDEN, Kearney, NE | Pass | State |
| 2025-09-25 | CARGILL INC POLYOL SWEETENERS | BLAIR, Washington, NE | Pass | State |
| 2025-09-25 | NE RENEWABLE POWER SPRINGFIELD | SPRINGFIELD, Sullivan, NH | Pass | State |
| 2025-09-25 | NE RENEWABLE POWER SPRINGFIELD | SPRINGFIELD, Sullivan, NH | Pass | State |
| 2025-09-25 | RED ROCK COMPRESSOR STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2025-09-25 | RED ROCK COMPRESSOR STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2025-09-25 | GAVILON TB | MONUMENT, Lea, NM | Pass | State |
| 2025-09-25 | CORIANDER COMPRESSOR STATION | EUNICE, Lea, NM | Pass | State |
| 2025-09-25 | CORIANDER COMPRESSOR STATION | EUNICE, Lea, NM | Pass | State |
| 2025-09-25 | IMPALA COMPRESSOR STATION | MONUMENT, Lea, NM | Pass | State |
| 2025-09-25 | IMPALA COMPRESSOR STATION | MONUMENT, Lea, NM | Pass | State |
| 2025-09-25 | RODEO UT NO508/509/510 | NAGEEZI, San Juan, NM | Pass | State |
| 2025-09-25 | CERTAINTEED GYPSUM MANUFACTURING, INC. | LAS VEGAS, Clark, NV | Pass | Local |
| 2025-09-25 | CERTAINTEED GYPSUM MANUFACTURING, INC. | LAS VEGAS, Clark, NV | Fail | Local |
| 2025-09-25 | THE CYRIL-SCOTT COMPANY | LANCASTER, Fairfield, OH | Pass | State |
| 2025-09-25 | THE CYRIL-SCOTT COMPANY | LANCASTER, Fairfield, OH | Pass | State |
| 2025-09-25 | THE CYRIL-SCOTT COMPANY | LANCASTER, Fairfield, OH | Pass | State |
| 2025-09-25 | THE CYRIL-SCOTT COMPANY | LANCASTER, Fairfield, OH | Pass | State |
| 2025-09-25 | THE CYRIL-SCOTT COMPANY | LANCASTER, Fairfield, OH | Pass | State |
| 2025-09-25 | THE CYRIL-SCOTT COMPANY | LANCASTER, Fairfield, OH | Pass | State |
| 2025-09-25 | THE CYRIL-SCOTT COMPANY | LANCASTER, Fairfield, OH | Pass | State |
| 2025-09-25 | THE CYRIL-SCOTT COMPANY | LANCASTER, Fairfield, OH | Pass | State |
| 2025-09-25 | AMERICAN NITRILE GROVE CITY — high-priority violation on file | GROVE CITY, Franklin, OH | Fail | State |
| 2025-09-25 | RECYCLE SERVICES LLC | SYLVANIA, Lucas, OH | Pass | State |
| 2025-09-25 | RECYCLE SERVICES LLC | SYLVANIA, Lucas, OH | Pass | State |
| 2025-09-25 | RECYCLE SERVICES LLC | SYLVANIA, Lucas, OH | Pass | State |
| 2025-09-25 | ASCENT RESOURCES - UTICA LLC - VINCENT MTP JF | ADENA, Jefferson, OH | Pass | State |
| 2025-09-25 | ASCENT RESOURCES - UTICA LLC - VINCENT MTP JF | ADENA, Jefferson, OH | Pass | State |
| 2025-09-25 | ASCENT RESOURCES - UTICA LLC - VINCENT MTP JF | ADENA, Jefferson, OH | Pass | State |
| 2025-09-25 | ASCENT RESOURCES - UTICA LLC - KRINKE MTP JF | MOUNT PLEASANT, Jefferson, OH | Pass | State |
| 2025-09-25 | ASCENT RESOURCES - UTICA LLC - KRINKE MTP JF | MOUNT PLEASANT, Jefferson, OH | Pass | State |
| 2025-09-25 | ASCENT RESOURCES - UTICA LLC - KRINKE MTP JF | MOUNT PLEASANT, Jefferson, OH | Pass | State |
| 2025-09-25 | BIMBO QSR OHIO,LLC.- EASTPOINTE FACILITY | ZANESVILLE, Muskingum, OH | Pass | State |
| 2025-09-25 | VITRO FLAT GLASS LLC/CARLISLE — high-priority violation on file | CARLISLE, Cumberland, PA | Pass | State |
| 2025-09-25 | ERIE SEWER AUTHORITY/ERIE WWTP — high-priority violation on file | ERIE, Erie, PA | Pass | State |
| 2025-09-25 | PA GEN ENERGY CO LLC/POTATO CREEK 2H COMP STA | SMETHPORT, McKean, PA | Pass | State |
| 2025-09-25 | EXPAND OPERATING LLC/HOOKER SUS PAD | MESHOPPEN, Susquehanna, PA | Pass | State |
| 2025-09-25 | A M WILLIAMS STATION | GOOSE CREEK, Berkeley, SC | Pass | State |
| 2025-09-25 | EXXONMOBIL OIL CORP. (EMOC) | MEMPHIS, Shelby, TN | Pass | Local |
| 2025-09-25 | URBAN OIL & GAS HELPER | PRICE, Carbon, UT | Pass | State |
| 2025-09-25 | URBAN OIL & GAS HELPER | PRICE, Carbon, UT | Pass | State |
| 2025-09-25 | URBAN OIL & GAS HELPER | PRICE, Carbon, UT | Pass | State |
| 2025-09-25 | URBAN OIL & GAS HELPER | PRICE, Carbon, UT | Pass | State |
| 2025-09-25 | PACIFICORP LAKESIDE (SUMMIT VINEYARD) | VINEYARD, Utah, UT | Pass | State |
| 2025-09-25 | PACIFICORP LAKESIDE (SUMMIT VINEYARD) | VINEYARD, Utah, UT | Pass | State |
| 2025-09-25 | HRSD - WILLIAMSBURG WASTEWATER TREATMENT PLANT | WILLIAMSBURG, James City, VA | Pass | State |
| 2025-09-25 | ERGON - WEST VIRGINIA, INC., NEWELL | NEWELL, Hancock, WV | Pass | State |
| 2025-09-25 | WEYERHAEUSER COMPANY, BUCKHANNON | BUCKHANNON, Upshur, WV | Pass | State |
| 2025-09-25 | WESTVACO FACILITY (WE SODA WYOMING LP) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-09-25 | WESTVACO FACILITY (WE SODA WYOMING LP) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-09-24 | KRONOSPAN USA — high-priority violation on file | EASTABOGA, Calhoun, AL | Pass | State |
| 2025-09-24 | AMERICAN KRAFT PAPER INDUSTRIES, LLC. | WHITE HALL, Jefferson, AR | Pass | State |
| 2025-09-24 | DESOTO GATHEIRNG COMPANY, LLC - GRAVEL HILL CPF-2 | CLEVELAND (HISTORICAL), TOWNSHIP OF, Van Buren, AR | Pass | State |
| 2025-09-24 | DESOTO GATHERING COMPANY, LLC - GRAVEL HILL CPF-4 | SCOTLAND, Van Buren, AR | Pass | State |
| 2025-09-24 | EL PASO NATURAL GAS CO - WILLIAMS COMPRESSOR STATION | WILLIAMS, Coconino, AZ | Pass | State |
| 2025-09-24 | LA CITY, DWP HARBOR GENERATING STATION | WILMINGTON, Los Angeles, 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 | 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 | 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 | 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 |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.