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 |
|---|---|---|---|---|
| 2026-05-29 | REWORLD INDIANAPOLIS INCORPORATED | INDIANAPOLIS, Marion, IN | Pass | State |
| 2026-05-29 | REWORLD INDIANAPOLIS INCORPORATED | INDIANAPOLIS, Marion, IN | Pass | State |
| 2026-05-29 | REWORLD INDIANAPOLIS INCORPORATED | INDIANAPOLIS, Marion, IN | Pass | State |
| 2026-05-29 | REWORLD INDIANAPOLIS INCORPORATED | INDIANAPOLIS, Marion, IN | Pass | State |
| 2026-05-29 | REWORLD INDIANAPOLIS INCORPORATED | INDIANAPOLIS, Marion, IN | Pass | State |
| 2026-05-29 | CLEVELAND CLIFFS NEW CARLISLE LLC — high-priority violation on file | NEW CARLISLE, St. Joseph, IN | Pass | State |
| 2026-05-29 | CLEVELAND CLIFFS NEW CARLISLE LLC — high-priority violation on file | NEW CARLISLE, St. Joseph, IN | Pass | State |
| 2026-05-29 | LIFE TECHNOLOGIES CORPORATION | DETROIT, Wayne, MI | Pass | State |
| 2026-05-29 | OREGON CLEAN ENERGY CENTER | OREGON, Lucas, OH | Pass | State |
| 2026-05-29 | MIAMI FORT POWER COMPANY LLC | NORTH BEND, Hamilton, OH | Pass | State |
| 2026-05-29 | EXPAND OPERATING LLC/N-24 BUCKHORN WELL PAD | MONTROSE, Susquehanna, PA | Pass | State |
| 2026-05-29 | EXPAND OPERATING LLC/NR-23 FOUR BUCKS PAD | SUSQUEHANNA, Susquehanna, PA | Pass | State |
| 2026-05-29 | PILGRIMS PRIDE CORPORATION | SUMTER, Sumter, SC | Pending | State |
| 2026-05-29 | RING NECK ENERGY & FEED LLC — high-priority violation on file | ONIDA, Sully, SD | Pass | State |
| 2026-05-29 | WESTLAKE NATRIUM LLC, WESTLAKE NATRIUM | PROCTOR, Marshall, WV | Pass | State |
| 2026-05-29 | ANTERO MIDSTREAM LLC, TORREYS PEAK COMP STATION | SISTERSVILLE, Tyler, WV | Pass | State |
| 2026-05-29 | ECHO SPRINGS GAS PLANT (WILLIAMS FIELD SERVICES) | CARBON COUNTY, Carbon, WY | Pass | State |
| 2026-05-29 | ECHO SPRINGS GAS PLANT (WILLIAMS FIELD SERVICES) | CARBON COUNTY, Carbon, WY | Pass | State |
| 2026-05-29 | ECHO SPRINGS GAS PLANT (WILLIAMS FIELD SERVICES) | CARBON COUNTY, Carbon, WY | Pass | State |
| 2026-05-29 | ECHO SPRINGS GAS PLANT (WILLIAMS FIELD SERVICES) | CARBON COUNTY, Carbon, WY | Pass | State |
| 2026-05-28 | MID CONTINENT COAL & COKE COMPANY | BLYTHEVILLE, Mississippi, AR | Pass | State |
| 2026-05-28 | MID CONTINENT COAL & COKE COMPANY | BLYTHEVILLE, Mississippi, AR | Pass | State |
| 2026-05-28 | MID CONTINENT COAL & COKE COMPANY | BLYTHEVILLE, Mississippi, AR | Pass | State |
| 2026-05-28 | MID CONTINENT COAL & COKE COMPANY | BLYTHEVILLE, Mississippi, AR | Pass | State |
| 2026-05-28 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | CARSON, Los Angeles, CA | Pass | Local |
| 2026-05-28 | CALIFORNIA RESOURCES PRODUCTION CORP | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-05-28 | CALIFORNIA RESOURCES PRODUCTION CORP | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-05-28 | U S INTEC, INC | STOCKTON, San Joaquin, CA | Pass | Local |
| 2026-05-28 | U S INTEC, INC | STOCKTON, San Joaquin, CA | Pass | Local |
| 2026-05-28 | U S INTEC, INC | STOCKTON, San Joaquin, CA | Pass | Local |
| 2026-05-28 | U S INTEC, INC | STOCKTON, San Joaquin, CA | Pass | Local |
| 2026-05-28 | U S INTEC, INC | STOCKTON, San Joaquin, CA | Pass | Local |
| 2026-05-28 | U S INTEC, INC | STOCKTON, San Joaquin, CA | Pass | Local |
| 2026-05-28 | PROCTER & GAMBLE PAPER PRODUCTS — high-priority violation on file | OXNARD, Ventura, CA | Pass | Local |
| 2026-05-28 | PDC ENERGY, INC. - GOLDEN EAGLE HZ | SEVERANCE AREA, Weld, CO | Pass | State |
| 2026-05-28 | ORLANDO UTILITIES COMMISSION | ORLANDO, Orange, FL | Pass | State |
| 2026-05-28 | ORLANDO UTILITIES COMMISSION | ORLANDO, Orange, FL | Pass | State |
| 2026-05-28 | DUKE ENERGY FLORIDA, LLC | BARTOW, Polk, FL | Pass | State |
| 2026-05-28 | GA POWER CO. - PLANT BOWEN | CARTERSVILLE, Bartow, GA | Pass | State |
| 2026-05-28 | VECENERGY | MACON, Bibb, GA | Pass | State |
| 2026-05-28 | CEMEX SOUTHEAST, LLC | CLINCHFIELD, Houston, GA | Pass | State |
| 2026-05-28 | CLEARWATER PAPER CORPORATION - AUGUSTA MILL — high-priority violation on file | AUGUSTA, Richmond, GA | Pass | State |
| 2026-05-28 | CLEARWATER PAPER CORPORATION - AUGUSTA MILL — high-priority violation on file | AUGUSTA, Richmond, GA | Pass | State |
| 2026-05-28 | CLEARWATER PAPER CORPORATION - AUGUSTA MILL — high-priority violation on file | AUGUSTA, Richmond, GA | Pass | State |
| 2026-05-28 | CLEARWATER PAPER CORPORATION - AUGUSTA MILL — high-priority violation on file | AUGUSTA, Richmond, GA | Pass | State |
| 2026-05-28 | WALTON COUNTY POWER LLC | MONROE, Walton, GA | Pass | State |
| 2026-05-28 | KAMIN - EDGAR PLANT | MCINTYRE, Wilkinson, GA | Pass | State |
| 2026-05-28 | MID AMERICAN ENERGY CO-COUNCIL BLUFFS | COUNCIL BLUFFS, Pottawattamie, IA | Pass | State |
| 2026-05-28 | GRAIN PROCESSING CORPORATION — high-priority violation on file | WASHINGTON, Daviess, IN | Pass | State |
| 2026-05-28 | ZIMMERMAN ENERGY LLC — high-priority violation on file | ARGOS, Marshall, IN | Pass | State |
| 2026-05-28 | ZIMMERMAN ENERGY LLC — high-priority violation on file | ARGOS, Marshall, IN | Pass | State |
| 2026-05-28 | ZIMMERMAN ENERGY LLC — high-priority violation on file | ARGOS, Marshall, IN | Pass | State |
| 2026-05-28 | REWORLD INDIANAPOLIS INCORPORATED | INDIANAPOLIS, Marion, IN | Pass | State |
| 2026-05-28 | REWORLD INDIANAPOLIS INCORPORATED | INDIANAPOLIS, Marion, IN | Pass | State |
| 2026-05-28 | REWORLD INDIANAPOLIS INCORPORATED | INDIANAPOLIS, Marion, IN | Pass | State |
| 2026-05-28 | REWORLD INDIANAPOLIS INCORPORATED | INDIANAPOLIS, Marion, IN | Pass | State |
| 2026-05-28 | REWORLD INDIANAPOLIS INCORPORATED | INDIANAPOLIS, Marion, IN | Pass | State |
| 2026-05-28 | REWORLD INDIANAPOLIS INCORPORATED | INDIANAPOLIS, Marion, IN | Pass | State |
| 2026-05-28 | REWORLD INDIANAPOLIS INCORPORATED | INDIANAPOLIS, Marion, IN | Pass | State |
| 2026-05-28 | NLMK INDIANA — high-priority violation on file | PORTAGE, Porter, IN | Pass | State |
| 2026-05-28 | NLMK INDIANA — high-priority violation on file | PORTAGE, Porter, IN | Pass | State |
| 2026-05-28 | NLMK INDIANA — high-priority violation on file | PORTAGE, Porter, IN | Pass | State |
| 2026-05-28 | NUCOR STEEL GALLATIN LLC | GHENT, Gallatin, KY | Pass | State |
| 2026-05-28 | NOVELIS CORPORATION | GUTHRIE, Todd, KY | Pass | State |
| 2026-05-28 | ROHM & HAAS - LOUISVILLE PLANT | LOUISVILLE, Jefferson, KY | Pass | Local |
| 2026-05-28 | BAYSTATE MEDICAL CENTER | SPRINGFIELD, CITY OF, Hampden, MA | Pending | State |
| 2026-05-28 | DTE ST. CLAIR / BELLE RIVER POWER PLANT — high-priority violation on file | CHINA, St. Clair, MI | Pass | State |
| 2026-05-28 | EATON RAPIDS GAS STORAGE SYSTEM | EATON RAPIDS, Ingham, MI | Pass | State |
| 2026-05-28 | ARAUCO NORTH AMERICA | GRAYLING, Crawford, MI | Pass | State |
| 2026-05-28 | UPPER MICHIGAN ENERGY RESOURCES -A.J. MIHM G.S. | PELKIE, Baraga, MI | Pass | State |
| 2026-05-28 | NEW FRONTIER MATERIALS - BEDROCK QUARRY | TROY, Lincoln, MO | Pass | State |
| 2026-05-28 | NEW FRONTIER MATERIALS - BEDROCK QUARRY | TROY, Lincoln, MO | Pass | State |
| 2026-05-28 | NEW FRONTIER MATERIALS - BEDROCK QUARRY | TROY, Lincoln, MO | Pass | State |
| 2026-05-28 | NEW FRONTIER MATERIALS - BEDROCK QUARRY | TROY, Lincoln, MO | Pass | State |
| 2026-05-28 | NEW FRONTIER MATERIALS - BEDROCK QUARRY | TROY, Lincoln, MO | Pass | State |
| 2026-05-28 | NEW FRONTIER MATERIALS - BEDROCK QUARRY | TROY, Lincoln, MO | Pass | State |
| 2026-05-28 | NEW FRONTIER MATERIALS - BEDROCK QUARRY | TROY, Lincoln, MO | Pass | State |
| 2026-05-28 | NEW FRONTIER MATERIALS - BEDROCK QUARRY | TROY, Lincoln, MO | Pass | State |
| 2026-05-28 | NEW FRONTIER MATERIALS - BEDROCK QUARRY | TROY, Lincoln, MO | Pass | State |
| 2026-05-28 | NEW FRONTIER MATERIALS - BEDROCK QUARRY | TROY, Lincoln, MO | Pass | State |
| 2026-05-28 | NEW FRONTIER MATERIALS - BEDROCK QUARRY | TROY, Lincoln, MO | Fail | State |
| 2026-05-28 | GCF US HOLDINGS, LLC - COLUMBUS MILL — high-priority violation on file | COLUMBUS, Lowndes, MS | Pass | State |
| 2026-05-28 | GCF US HOLDINGS, LLC - COLUMBUS MILL — high-priority violation on file | COLUMBUS, Lowndes, MS | Pass | State |
| 2026-05-28 | SELEE CORPORATION | HENDERSONVILLE, Henderson, NC | Pending | State |
| 2026-05-28 | GRANITE RIDGE ENERGY, LLC | LONDONDERRY, Rockingham, NH | Incomplete | State |
| 2026-05-28 | CERTAINTEED GYPSUM MANUFACTURING, INC. | LAS VEGAS, Clark, NV | Pass | Local |
| 2026-05-28 | CERTAINTEED GYPSUM MANUFACTURING, INC. | LAS VEGAS, Clark, NV | Pass | Local |
| 2026-05-28 | MILLER-MASON PAVING CO., INC. | HILLSBORO, Highland, OH | Pass | State |
| 2026-05-28 | MAR ZANE PLANT NO 3 | GNADENHUTTEN, Tuscarawas, OH | Pass | State |
| 2026-05-28 | EOG RESOURCES, INC. - MCMILLEN TC RSH PAD | UHRICHSVILLE, Tuscarawas, OH | Pass | State |
| 2026-05-28 | EOG RESOURCES, INC. - MCMILLEN TC RSH PAD | UHRICHSVILLE, Tuscarawas, OH | Pass | State |
| 2026-05-28 | EOG RESOURCES, INC. - MCMILLEN TC RSH PAD | UHRICHSVILLE, Tuscarawas, OH | Pass | State |
| 2026-05-28 | MIAMI FORT POWER COMPANY LLC | NORTH BEND, Hamilton, OH | Pass | State |
| 2026-05-28 | MIAMI FORT POWER COMPANY LLC | NORTH BEND, Hamilton, OH | Pass | State |
| 2026-05-28 | RSI METAL LITHO/GREENVILLE | GREENVILLE, Mercer, PA | Pass | State |
| 2026-05-28 | PIN OAK MIDSTREAM LLC/TOWNVILLE COMP STA — high-priority violation on file | TOWNVILLE, Crawford, PA | Pass | State |
| 2026-05-28 | RU-64 BOMAN WELL PAD | SUSQUEHANNA, Susquehanna, PA | Pass | State |
| 2026-05-28 | RU-55 CONKLIN PAD | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2026-05-28 | HAILE GOLD MINE INC | KERSHAW, Lancaster, SC | Pending | State |
| 2026-05-28 | CLARIOS LLC — high-priority violation on file | WEST UNION, Oconee, SC | Fail | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.