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 |
|---|---|---|---|---|
| 2026-06-26 | WARRICK NEWCO LLC — high-priority violation on file | NEWBURGH, Warrick, IN | Fail | State |
| 2026-06-26 | WARRICK NEWCO LLC — high-priority violation on file | NEWBURGH, Warrick, IN | Pass | State |
| 2026-06-26 | WARRICK NEWCO LLC — high-priority violation on file | NEWBURGH, Warrick, IN | Fail | State |
| 2026-06-26 | BIO TOWN BIOGAS LLC & BIO TOWN AG INCORPORATED — high-priority violation on file | REYNOLDS, White, IN | Pass | State |
| 2026-06-26 | BIO TOWN BIOGAS LLC & BIO TOWN AG INCORPORATED — high-priority violation on file | REYNOLDS, White, IN | Pass | State |
| 2026-06-26 | BIO TOWN BIOGAS LLC & BIO TOWN AG INCORPORATED — high-priority violation on file | REYNOLDS, White, IN | Pass | State |
| 2026-06-26 | EASTERN MI UNIVERSITY — high-priority violation on file | YPSILANTI, Washtenaw, MI | Pass | State |
| 2026-06-26 | SUMPTER GENERATING PLANT | BELLEVILLE, Wayne, MI | Pass | State |
| 2026-06-26 | WILLIAMS - SALEM COMPRESSOR STATION | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-06-26 | WILLIAMS - SALEM COMPRESSOR STATION | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-06-26 | WILLIAMS - SALEM COMPRESSOR STATION | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-06-26 | WILLIAMS - SALEM COMPRESSOR STATION | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-06-26 | WILLIAMS - SALEM COMPRESSOR STATION | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-06-26 | WILLIAMS - SALEM COMPRESSOR STATION | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-06-26 | WILLIAMS - SALEM COMPRESSOR STATION | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-06-26 | WILLIAMS - SALEM COMPRESSOR STATION | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-06-26 | WILLIAMS - SALEM COMPRESSOR STATION | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-06-26 | WILLIAMS - SALEM COMPRESSOR STATION | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-06-26 | WILLIAMS - SALEM COMPRESSOR STATION | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-06-26 | WILLIAMS - SALEM COMPRESSOR STATION | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-06-26 | WILLIAMS - SALEM COMPRESSOR STATION | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-06-26 | WILLIAMS - SALEM COMPRESSOR STATION | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-06-26 | WILLIAMS - SALEM COMPRESSOR STATION | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-06-26 | WILLIAMS - SALEM COMPRESSOR STATION | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-06-26 | WILLIAMS - SALEM COMPRESSOR STATION | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-06-26 | WILLIAMS - SALEM COMPRESSOR STATION | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-06-26 | COMMERCIAL ASPHALT SUPPLY/FENELTON | FENELTON, Butler, PA | Fail | State |
| 2026-06-26 | EXPAND OPERATING LLC/ADAMS WYO PAD | LACEYVILLE, Wyoming, PA | Pass | State |
| 2026-06-26 | RU-05 DRANN PAD | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2026-06-26 | ADVANSIX (FORMERLY HONEYWELL/FRANKFORD PLT) — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Pending | Local |
| 2026-06-26 | MIDLOTHIAN FACILITY | MIDLOTHIAN, Ellis, TX | N/A | State |
| 2026-06-26 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | Pass | State |
| 2026-06-26 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | Pass | State |
| 2026-06-26 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | Pass | State |
| 2026-06-26 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | Pass | State |
| 2026-06-26 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | Pass | State |
| 2026-06-26 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | Pass | State |
| 2026-06-26 | AMRIZE CEMENT/FORMERLY HOLCIM (US), INC. — high-priority violation on file | MORGAN, Morgan, UT | Pass | State |
| 2026-06-26 | MONONGAHELA POWER COMPANY, HARRISON STATION | HAYWOOD, Harrison, WV | Pass | State |
| 2026-06-26 | NEIL SIMPSON COMPLEX (BLACK HILLS CORPORATION) | GILLETTE, Campbell, WY | Pass | State |
| 2026-06-26 | NEIL SIMPSON COMPLEX (BLACK HILLS CORPORATION) | GILLETTE, Campbell, WY | Pass | State |
| 2026-06-25 | PETRO STAR, INC. / PORT OF ALASKA TERMINAL (FORMERLY ANCHO | ANCHORAGE, Anchorage Municipality, AK | Pass | State |
| 2026-06-25 | KNAUF INSULATION | LANETT, Chambers, AL | Pass | State |
| 2026-06-25 | KNAUF INSULATION | LANETT, Chambers, AL | Pass | State |
| 2026-06-25 | KNAUF INSULATION | LANETT, Chambers, AL | Pass | State |
| 2026-06-25 | KNAUF INSULATION | LANETT, Chambers, AL | Pass | State |
| 2026-06-25 | CONSTELLIUM — high-priority violation on file | MUSCLE SHOALS, Colbert, AL | Pass | State |
| 2026-06-25 | PLUM POINT SERVICES COMPANY, LLC - PLUM POINT ENERGY STATION | OSCEOLA, Mississippi, AR | Pass | State |
| 2026-06-25 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-25 | ROCKIES EXPRESS PIPELINE - BIG HOLE CS | CRAIG 30.5 MI. NW OF, Moffat, CO | Pass | State |
| 2026-06-25 | U S NAVAL SUBMARINE BASE — high-priority violation on file | GROTON (HISTORICAL), New London, CT | Pass | State |
| 2026-06-25 | U S NAVAL SUBMARINE BASE — high-priority violation on file | GROTON (HISTORICAL), New London, CT | Pass | State |
| 2026-06-25 | SOUTH FLORIDA WATER MANAGEMENT DISTRICT | PALM BEACH COUNTY, Palm Beach, FL | Pass | State |
| 2026-06-25 | SOUTH FLORIDA WATER MANAGEMENT DISTRICT | PALM BEACH COUNTY, Palm Beach, FL | Pass | State |
| 2026-06-25 | SOUTH FLORIDA WATER MANAGEMENT DISTRICT | PALM BEACH COUNTY, Palm Beach, FL | Pass | State |
| 2026-06-25 | SOUTH FLORIDA WATER MANAGEMENT DISTRICT | PALM BEACH COUNTY, Palm Beach, FL | Pass | State |
| 2026-06-25 | TALBOT ENERGY FACILITY | BOX SPRINGS, Talbot, GA | Pass | State |
| 2026-06-25 | STAKER AND PARSON COMPANIES DBA IDAHO MATERIALS AND CONSTRUCTION 00407 | MERIDIAN, Ada, ID | Pass | State |
| 2026-06-25 | MARSHALL MUNICIPAL UTILITIES | MARSHALL, Clark, IL | Pass | State |
| 2026-06-25 | ARCHER DANIELS MIDLAND CO — high-priority violation on file | DECATUR, Macon, IL | Pass | State |
| 2026-06-25 | ARCHER DANIELS MIDLAND CO — high-priority violation on file | DECATUR, Macon, IL | Pass | State |
| 2026-06-25 | ARCHER DANIELS MIDLAND CO — high-priority violation on file | DECATUR, Macon, IL | Pass | State |
| 2026-06-25 | BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file | WHITING, Lake, IN | Pass | State |
| 2026-06-25 | BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file | WHITING, Lake, IN | Pass | State |
| 2026-06-25 | BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file | WHITING, Lake, IN | Pass | State |
| 2026-06-25 | ALCOA POWER GENERATING INC WARRICK POWER PLANT — high-priority violation on file | NEWBURGH, Warrick, IN | Fail | State |
| 2026-06-25 | ALCOA POWER GENERATING INC WARRICK POWER PLANT — high-priority violation on file | NEWBURGH, Warrick, IN | Pass | State |
| 2026-06-25 | BIO TOWN BIOGAS LLC & BIO TOWN AG INCORPORATED — high-priority violation on file | REYNOLDS, White, IN | Pass | State |
| 2026-06-25 | BIO TOWN BIOGAS LLC & BIO TOWN AG INCORPORATED — high-priority violation on file | REYNOLDS, White, IN | Pass | State |
| 2026-06-25 | BIO TOWN BIOGAS LLC & BIO TOWN AG INCORPORATED — high-priority violation on file | REYNOLDS, White, IN | Pass | State |
| 2026-06-25 | BIO TOWN BIOGAS LLC & BIO TOWN AG INCORPORATED — high-priority violation on file | REYNOLDS, White, IN | Pass | State |
| 2026-06-25 | BIO TOWN BIOGAS LLC & BIO TOWN AG INCORPORATED — high-priority violation on file | REYNOLDS, White, IN | Pass | State |
| 2026-06-25 | BIO TOWN BIOGAS LLC & BIO TOWN AG INCORPORATED — high-priority violation on file | REYNOLDS, White, IN | Pass | State |
| 2026-06-25 | OSAGE CITY MUN. POWER PLANT (AIR) | OSAGE CITY, Osage, KS | Pass | State |
| 2026-06-25 | DTE ST. CLAIR / BELLE RIVER POWER PLANT — high-priority violation on file | CHINA, St. Clair, MI | Pass | State |
| 2026-06-25 | DTE ELECTRIC COMPANY - MONROE POWER PLANT | MONROE, Monroe, MI | Pass | State |
| 2026-06-25 | PACKAGING CORPORATION OF AMERICA - FILER CITY MILL | FILER CITY, Manistee, MI | Pass | State |
| 2026-06-25 | ANR PIPELINE - CENTRAL CHARLTON COMPRESSOR STATION | JOHANNESBURG, Otsego, MI | Pass | State |
| 2026-06-25 | PIONEER METAL FINISHING INDUSTRIAL HWY | WARREN, Macomb, MI | Pass | State |
| 2026-06-25 | XCEL ENERGY - ALLEN S KING GENERATING PLANT | BAYPORT, Washington, MN | Pass | State |
| 2026-06-25 | WILLISTON BASIN - FORT PECK STATION | NASHUA, Valley, MT | Pass | State |
| 2026-06-25 | 3M PITTSBORO - INDUSTRIAL MINERAL PRODUCTS | MONCURE, Chatham, NC | Pass | State |
| 2026-06-25 | 3M PITTSBORO - INDUSTRIAL MINERAL PRODUCTS | MONCURE, Chatham, NC | Pass | State |
| 2026-06-25 | LUCK STONE CORPORATION - MOUNT AIRY PLANT | MOUNT AIRY, Surry, NC | Pending | State |
| 2026-06-25 | FSC II, LLC - KNIGHTDALE ASPHALT PLANT | KNIGHTDALE, Wake, NC | Fail | State |
| 2026-06-25 | WHEELABRATOR CONCORD COMPANY, L.P. | CONCORD, Merrimack, NH | Pending | State |
| 2026-06-25 | CLEVELAND-CLIFFS WARREN | WARREN, Trumbull, OH | Pass | State |
| 2026-06-25 | LRBG CHEMICALS (USA) INC. | TOLEDO, Lucas, OH | Pass | State |
| 2026-06-25 | LRBG CHEMICALS (USA) INC. | TOLEDO, Lucas, OH | Pass | State |
| 2026-06-25 | LRBG CHEMICALS (USA) INC. | TOLEDO, Lucas, OH | Pass | State |
| 2026-06-25 | ENBRIDGE - SUMMERFIELD COMPRESSOR STATION | CALDWELL, Noble, OH | Pass | State |
| 2026-06-25 | ENBRIDGE - SUMMERFIELD COMPRESSOR STATION | CALDWELL, Noble, OH | Pass | State |
| 2026-06-25 | ENBRIDGE - SUMMERFIELD COMPRESSOR STATION | CALDWELL, Noble, OH | Pass | State |
| 2026-06-25 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2026-06-25 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2026-06-25 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2026-06-25 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2026-06-25 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2026-06-25 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2026-06-25 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.