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 |
|---|---|---|---|---|
| 2026-03-26 | MIAMI-DADE WATER AND SEWER DEPARTMENT | MIAMI, Miami-Dade, FL | Pass | State |
| 2026-03-26 | MIAMI-DADE WATER AND SEWER DEPARTMENT | MIAMI, Miami-Dade, FL | Pass | State |
| 2026-03-26 | FLORIDA POWER & LIGHT (PRV) | RIVIERA BEACH, Palm Beach, FL | Pass | State |
| 2026-03-26 | PLCP, L.P. | STEAMBOAT ROCK, Hardin, IA | Pass | State |
| 2026-03-26 | PLCP, L.P. | STEAMBOAT ROCK, Hardin, IA | Pass | State |
| 2026-03-26 | PRESTAGE FOODS OF IOWA, LLC | EAGLE GROVE, Wright, IA | Pass | State |
| 2026-03-26 | ID CASTINGS OF ILLINOIS LLC — high-priority violation on file | MARTINSVILLE, Clark, IL | Pass | State |
| 2026-03-26 | DALTON CORPORATION WARSAW MANUFACTURING FACILITY — high-priority violation on file | WARSAW, Kosciusko, IN | Fail | State |
| 2026-03-26 | DALTON CORPORATION WARSAW MANUFACTURING FACILITY — high-priority violation on file | WARSAW, Kosciusko, IN | Pass | State |
| 2026-03-26 | DALTON CORPORATION WARSAW MANUFACTURING FACILITY — high-priority violation on file | WARSAW, Kosciusko, IN | Pass | State |
| 2026-03-26 | DALTON CORPORATION WARSAW MANUFACTURING FACILITY — high-priority violation on file | WARSAW, Kosciusko, IN | Pass | State |
| 2026-03-26 | DALTON CORPORATION WARSAW MANUFACTURING FACILITY — high-priority violation on file | WARSAW, Kosciusko, IN | Pass | State |
| 2026-03-26 | DALTON CORPORATION WARSAW MANUFACTURING FACILITY — high-priority violation on file | WARSAW, Kosciusko, IN | Pass | State |
| 2026-03-26 | OWENS CORNING (AIR) — high-priority violation on file | KANSAS CITY, Wyandotte, KS | Pass | State |
| 2026-03-26 | HARSHMAN CONST (MASTER EQUIP LIST) (AIR) | CEDAR POINT, Marion, KS | Pass | State |
| 2026-03-26 | GENERAL MOTORS LLC - PONTIAC NORTH CAMPUS | PONTIAC, Oakland, MI | Pass | State |
| 2026-03-26 | GM TECHNICAL CENTER | WARREN, Macomb, MI | Pass | State |
| 2026-03-26 | ARAUCO NORTH AMERICA | GRAYLING, Crawford, MI | Pass | State |
| 2026-03-26 | NOBLE HILL SANITARY LANDFILL | WILLARD, Greene, MO | Pass | State |
| 2026-03-26 | GREEN PLAINS YORK LLC — high-priority violation on file | YORK, York, NE | N/A | State |
| 2026-03-26 | AQUEDUCT COMPRESSOR STATION | WHITES CITY, Eddy, NM | Pass | State |
| 2026-03-26 | AQUEDUCT COMPRESSOR STATION | WHITES CITY, Eddy, NM | Pass | State |
| 2026-03-26 | NORTH CORRIDOR EAST CENTRAL GAS LIFT | MALAGA, Eddy, NM | Pass | State |
| 2026-03-26 | NORTH PEN COMPRESSOR STATION | ARTESIA, Eddy, NM | Pass | State |
| 2026-03-26 | HERRADURA COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2026-03-26 | HERRADURA COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2026-03-26 | RIO GRANDE 2-1 BATTERY 1 | LOCO HILLS, Eddy, NM | Pass | State |
| 2026-03-26 | PONY EXPRESS FED WEST TB | MONUMENT, Lea, NM | Pass | State |
| 2026-03-26 | ROBERNE COMPRESSOR STATION | MALAGA, Lea, NM | Pass | State |
| 2026-03-26 | DEPARTMENT OF PUBLIC UTILITIES, CITY OF ORRVILLE, OHIO | ORRVILLE, Wayne, OH | Pass | State |
| 2026-03-26 | COLUMBIA GAS TRANSMISSION -D74 SOUTH MUDDY CREEK COMPRESSION | OAK HARBOR, Ottawa, OH | Pass | State |
| 2026-03-26 | COLUMBIA GAS TRANSMISSION -D74 SOUTH MUDDY CREEK COMPRESSION | OAK HARBOR, Ottawa, OH | Pass | State |
| 2026-03-26 | COLUMBIA GAS TRANSMISSION -D74 SOUTH MUDDY CREEK COMPRESSION | OAK HARBOR, Ottawa, OH | Pass | State |
| 2026-03-26 | ASCENT RESOURCES - GRAND WRN BL | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-26 | ASCENT RESOURCES - GRAND WRN BL | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-26 | ASCENT RESOURCES - GRAND WRN BL | BARNESVILLE, Belmont, OH | Pass | State |
| 2026-03-26 | ASCENT RESOURCES -UTICA LLC - KUNGLE B N YRK BL WELLPAD | POWHATAN POINT, Belmont, OH | Pass | State |
| 2026-03-26 | ASCENT RESOURCES -UTICA LLC - KUNGLE B N YRK BL WELLPAD | POWHATAN POINT, Belmont, OH | Pass | State |
| 2026-03-26 | ASCENT RESOURCES -UTICA LLC - KUNGLE B N YRK BL WELLPAD | POWHATAN POINT, Belmont, OH | Pass | State |
| 2026-03-26 | ASCENT RESOURCES - UTICA LLC - LAVADA RCH GR | SALESVILLE, Guernsey, OH | Pass | State |
| 2026-03-26 | ASCENT RESOURCES - UTICA LLC - LAVADA RCH GR | SALESVILLE, Guernsey, OH | Pass | State |
| 2026-03-26 | ASCENT RESOURCES - UTICA LLC - LAVADA RCH GR | SALESVILLE, Guernsey, OH | Pass | State |
| 2026-03-26 | WILLIAMS FIELD SVC CO LLC/TEEL COMP STA | SPRINGVILLE, Susquehanna, PA | Pass | State |
| 2026-03-26 | EQM GATHERING OPCO LLC/COLE FARM COMPRESSOR STATION | HOLBROOK, Greene, PA | Pass | State |
| 2026-03-26 | RI DEPT.OF ADMINISTRATION,PASTORE CENTER | CRANSTON, Providence, RI | Pass | State |
| 2026-03-26 | CRANSTON WPCF | CRANSTON, Providence, RI | Pass | State |
| 2026-03-26 | EVERRIS NA INC CHARLESTON | N CHARLESTON, Charleston, SC | Pass | State |
| 2026-03-26 | NOMAN M. COLE JR. WATER RECYCLING FACILITY | LORTON, Fairfax, VA | Pass | State |
| 2026-03-26 | HRSD - VIRGINIA INITIATIVE WASTEWATER TREATMENT PLANT | NORFOLK, Norfolk (city), VA | Pass | State |
| 2026-03-26 | CHARTER STEEL | SAUKVILLE, Ozaukee, WI | Pass | State |
| 2026-03-26 | APPALACHIA MIDSTREAM SERVICES, L.L.C., RIDGELINE STATION | CAMERON, Marshall, WV | Pass | State |
| 2026-03-26 | NEIL SIMPSON COMPLEX (BLACK HILLS CORPORATION) | GILLETTE, Campbell, WY | Pass | State |
| 2026-03-26 | NEIL SIMPSON COMPLEX (BLACK HILLS CORPORATION) | GILLETTE, Campbell, WY | Pass | State |
| 2026-03-25 | KRONOSPAN USA — high-priority violation on file | EASTABOGA, Calhoun, AL | Pass | State |
| 2026-03-25 | KRONOSPAN USA — high-priority violation on file | EASTABOGA, Calhoun, AL | Pass | State |
| 2026-03-25 | GULFSTREAM NATURAL GAS SYSTEM LLC | CODEN, Mobile, AL | Pass | State |
| 2026-03-25 | TORAY COMPOSITE MATERIALS AMERICA, INC | DECATUR, Morgan, AL | Pass | State |
| 2026-03-25 | WESTROCK COATED BOARD LLC-MAHRT MILL | PHENIX CITY, Russell, AL | Pass | State |
| 2026-03-25 | EL PASO NATURAL GAS CO - ALAMO LAKE COMPRESSOR STATION | ALAMO CROSSING (HISTORICAL), La Paz, AZ | Pass | State |
| 2026-03-25 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-03-25 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-03-25 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-03-25 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-03-25 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-03-25 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-03-25 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-03-25 | EXTRACTION- MILKSHAKE 31-W / PAVISTMA-N | WINDSOR AREA, Weld, CO | Pass | State |
| 2026-03-25 | MILLIKEN & CO. DBA SIVANCE, LLC | GAINESVILLE, Alachua, FL | Pass | State |
| 2026-03-25 | MILLIKEN & CO. DBA SIVANCE, LLC | GAINESVILLE, Alachua, FL | Pass | State |
| 2026-03-25 | MIAMI-DADE WATER AND SEWER DEPARTMENT | MIAMI, Miami-Dade, FL | Pass | State |
| 2026-03-25 | MIAMI-DADE WATER AND SEWER DEPARTMENT | MIAMI, Miami-Dade, FL | Pass | State |
| 2026-03-25 | WHITE SPRINGS AGRICULTURAL CHEMICALS,INC | WHITE SPRINGS, Hamilton, FL | Pass | State |
| 2026-03-25 | WHITE SPRINGS AGRICULTURAL CHEMICALS,INC | WHITE SPRINGS, Hamilton, FL | Pass | State |
| 2026-03-25 | CITY OF TALLAHASSEE | TALLAHASSEE, Leon, FL | Pass | State |
| 2026-03-25 | CITY OF TALLAHASSEE | TALLAHASSEE, Leon, FL | Pass | State |
| 2026-03-25 | CITY OF TALLAHASSEE | TALLAHASSEE, Leon, FL | Pass | State |
| 2026-03-25 | CITY OF TALLAHASSEE | TALLAHASSEE, Leon, FL | Pass | State |
| 2026-03-25 | CITY OF TALLAHASSEE | TALLAHASSEE, Leon, FL | Pass | State |
| 2026-03-25 | FLORIDA POWER & LIGHT (PRV) | RIVIERA BEACH, Palm Beach, FL | Pass | State |
| 2026-03-25 | SARASOTA COUNTY BOARD OF COUNTY COMMISSI | NOKOMIS, Sarasota, FL | Pass | State |
| 2026-03-25 | SARASOTA COUNTY BOARD OF COUNTY COMMISSI | NOKOMIS, Sarasota, FL | Pass | State |
| 2026-03-25 | SARASOTA COUNTY BOARD OF COUNTY COMMISSI | NOKOMIS, Sarasota, FL | Pass | State |
| 2026-03-25 | SARASOTA COUNTY BOARD OF COUNTY COMMISSI | NOKOMIS, Sarasota, FL | Pass | State |
| 2026-03-25 | SARASOTA COUNTY BOARD OF COUNTY COMMISSI | NOKOMIS, Sarasota, FL | Pass | State |
| 2026-03-25 | SARASOTA COUNTY BOARD OF COUNTY COMMISSI | NOKOMIS, Sarasota, FL | Pass | State |
| 2026-03-25 | SARASOTA COUNTY BOARD OF COUNTY COMMISSI | NOKOMIS, Sarasota, FL | Pass | State |
| 2026-03-25 | SARASOTA COUNTY BOARD OF COUNTY COMMISSI | NOKOMIS, Sarasota, FL | Pass | State |
| 2026-03-25 | HAZLEHURST WOOD PELLETS, LLC — high-priority violation on file | HAZLEHURST, Jeff Davis, GA | Pass | State |
| 2026-03-25 | HAZLEHURST WOOD PELLETS, LLC — high-priority violation on file | HAZLEHURST, Jeff Davis, GA | Pass | State |
| 2026-03-25 | HAZLEHURST WOOD PELLETS, LLC — high-priority violation on file | HAZLEHURST, Jeff Davis, GA | Pass | State |
| 2026-03-25 | HAZLEHURST WOOD PELLETS, LLC — high-priority violation on file | HAZLEHURST, Jeff Davis, GA | Pass | State |
| 2026-03-25 | HAZLEHURST WOOD PELLETS, LLC — high-priority violation on file | HAZLEHURST, Jeff Davis, GA | Pass | State |
| 2026-03-25 | HAZLEHURST WOOD PELLETS, LLC — high-priority violation on file | HAZLEHURST, Jeff Davis, GA | Pass | State |
| 2026-03-25 | HAZLEHURST WOOD PELLETS, LLC — high-priority violation on file | HAZLEHURST, Jeff Davis, GA | Pass | State |
| 2026-03-25 | HAZLEHURST WOOD PELLETS, LLC — high-priority violation on file | HAZLEHURST, Jeff Davis, GA | Pass | State |
| 2026-03-25 | HAZLEHURST WOOD PELLETS, LLC — high-priority violation on file | HAZLEHURST, Jeff Davis, GA | Pass | State |
| 2026-03-25 | HAZLEHURST WOOD PELLETS, LLC — high-priority violation on file | HAZLEHURST, Jeff Davis, GA | Pass | State |
| 2026-03-25 | HAZLEHURST WOOD PELLETS, LLC — high-priority violation on file | HAZLEHURST, Jeff Davis, GA | Pass | State |
| 2026-03-25 | SUMNER MUNICIPAL LIGHT PLANT | SUMNER (HISTORICAL), Bremer, IA | Pass | State |
| 2026-03-25 | SUMNER MUNICIPAL LIGHT PLANT | SUMNER (HISTORICAL), Bremer, IA | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.