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 |
|---|---|---|---|---|
| 2026-02-24 | AMERICAN CRYSTAL SUGAR - EAST GRAND FORKS | EAST GRAND FORKS, Polk, MN | Fail | State |
| 2026-02-24 | ALPEK POLYESTER MISSISSIPPI INC — high-priority violation on file | BAY ST. LOUI, Hancock, MS | Pass | State |
| 2026-02-24 | ALPEK POLYESTER MISSISSIPPI INC — high-priority violation on file | BAY ST. LOUI, Hancock, MS | Pass | State |
| 2026-02-24 | ALPEK POLYESTER MISSISSIPPI INC — high-priority violation on file | BAY ST. LOUI, Hancock, MS | Pass | State |
| 2026-02-24 | ALPEK POLYESTER MISSISSIPPI INC — high-priority violation on file | BAY ST. LOUI, Hancock, MS | Pass | State |
| 2026-02-24 | GEORGIA PACIFIC MONTICELLO LLC | MONTICELLO, Lawrence, MS | Pass | State |
| 2026-02-24 | BLUE MOUNTAIN PRODUCTION COMPANY, TAYLOR AND PLANT PROPERTY MINE | BLUE MOUNTAI, Tippah, MS | Pass | State |
| 2026-02-24 | BLUE MOUNTAIN PRODUCTION COMPANY, TAYLOR AND PLANT PROPERTY MINE | BLUE MOUNTAI, Tippah, MS | Pass | State |
| 2026-02-24 | BLUE MOUNTAIN PRODUCTION COMPANY, TAYLOR AND PLANT PROPERTY MINE | BLUE MOUNTAI, Tippah, MS | Pass | State |
| 2026-02-24 | BLUE MOUNTAIN PRODUCTION COMPANY, TAYLOR AND PLANT PROPERTY MINE | BLUE MOUNTAI, Tippah, MS | Pass | State |
| 2026-02-24 | BLUE MOUNTAIN PRODUCTION COMPANY, TAYLOR AND PLANT PROPERTY MINE | BLUE MOUNTAI, Tippah, MS | Pass | State |
| 2026-02-24 | BLUE MOUNTAIN PRODUCTION COMPANY, TAYLOR AND PLANT PROPERTY MINE | BLUE MOUNTAI, Tippah, MS | Pass | State |
| 2026-02-24 | BLUE MOUNTAIN PRODUCTION COMPANY, TAYLOR AND PLANT PROPERTY MINE | BLUE MOUNTAI, Tippah, MS | Pass | State |
| 2026-02-24 | BLUE MOUNTAIN PRODUCTION COMPANY, TAYLOR AND PLANT PROPERTY MINE | BLUE MOUNTAI, Tippah, MS | Pass | State |
| 2026-02-24 | BLUE MOUNTAIN PRODUCTION COMPANY, TAYLOR AND PLANT PROPERTY MINE | BLUE MOUNTAI, Tippah, MS | Pass | State |
| 2026-02-24 | BLUE MOUNTAIN PRODUCTION COMPANY, TAYLOR AND PLANT PROPERTY MINE | BLUE MOUNTAI, Tippah, MS | Pass | State |
| 2026-02-24 | BLUE MOUNTAIN PRODUCTION COMPANY, TAYLOR AND PLANT PROPERTY MINE | BLUE MOUNTAI, Tippah, MS | Pass | State |
| 2026-02-24 | TRANSCONTINENTAL GAS PIPELINE COMPANY LLC, STATION 70 | TYLERTOWN, Walthall, MS | Pass | State |
| 2026-02-24 | TRANSCONTINENTAL GAS PIPELINE COMPANY LLC, STATION 70 | TYLERTOWN, Walthall, MS | Pass | State |
| 2026-02-24 | TRANSCONTINENTAL GAS PIPELINE COMPANY LLC, STATION 70 | TYLERTOWN, Walthall, MS | Pass | State |
| 2026-02-24 | DUKE ENERGY CORPORATION LCTS | STANLEY, Lincoln, NC | Pass | State |
| 2026-02-24 | MCIEAST-MARINE CORPS BASE CAMP LEJEUNE | CAMP LEJEUNE (ONSLOW,NC), Onslow, NC | Pass | State |
| 2026-02-24 | XTO - LOS DOS MEDANOS TANK BATTERY | MALAGA, Eddy, NM | Pass | State |
| 2026-02-24 | XTO - LOS DOS MEDANOS TANK BATTERY | MALAGA, Eddy, NM | Pass | State |
| 2026-02-24 | ZIA HILLS CENTRAL FACILITY | MALAGA, Lea, NM | Pass | State |
| 2026-02-24 | ZIA HILLS CENTRAL FACILITY | MALAGA, Lea, NM | Pass | State |
| 2026-02-24 | DOS EQUIS COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-02-24 | DOS EQUIS COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-02-24 | SALADO DRAW 10 W0NC FED COM NO3H BATTERY | JAL, Lea, NM | Pass | State |
| 2026-02-24 | EASTERN GAS TRANSMISSION AND STORAGE, INC. - NEWARK | HANOVER, TOWNSHIP OF, Licking, OH | Pass | State |
| 2026-02-24 | EASTERN GAS TRANSMISSION AND STORAGE, INC. - NEWARK | HANOVER, TOWNSHIP OF, Licking, OH | Pass | State |
| 2026-02-24 | PAVONIA COMPRESSOR STATION | MANSFIELD, Richland, OH | Pass | State |
| 2026-02-24 | PAVONIA COMPRESSOR STATION | MANSFIELD, Richland, OH | Pass | State |
| 2026-02-24 | PAVONIA COMPRESSOR STATION | MANSFIELD, Richland, OH | Pass | State |
| 2026-02-24 | PAVONIA COMPRESSOR STATION | MANSFIELD, Richland, OH | Pass | State |
| 2026-02-24 | ENBRIDGE GAS OHIO - PIKE COMPRESSOR STATION | CANTON, Stark, OH | Pass | State |
| 2026-02-24 | ENBRIDGE GAS OHIO - PIKE COMPRESSOR STATION | CANTON, Stark, OH | Pass | State |
| 2026-02-24 | ENBRIDGE GAS OHIO - PIKE COMPRESSOR STATION | CANTON, Stark, OH | Pass | State |
| 2026-02-24 | ENBRIDGE GAS OHIO - PIKE COMPRESSOR STATION | CANTON, Stark, OH | Pass | State |
| 2026-02-24 | ENBRIDGE GAS OHIO - PIKE COMPRESSOR STATION | CANTON, Stark, OH | Pass | State |
| 2026-02-24 | ENBRIDGE GAS OHIO - PIKE COMPRESSOR STATION | CANTON, Stark, OH | Pass | State |
| 2026-02-24 | GLAXO SMITHKLINE/UPPER PROVIDENCE — high-priority violation on file | COLLEGEVILLE, Montgomery, PA | Pass | State |
| 2026-02-24 | EASTERN GAS TRANSMISSION & STORAGE INC/NORTH SUMMIT | HOPWOOD, Fayette, PA | Pass | State |
| 2026-02-24 | MARKWEST LIBERTY MIDSTREAM/WELLING COMP STA | CLAYSVILLE, Washington, PA | Pass | State |
| 2026-02-24 | EXPAND OPERATING LLC/ALVAREZ BRA WELL PAD | LACEYVILLE, Bradford, PA | Pass | State |
| 2026-02-24 | SANTEE COOPER WINYAH GENERATING STATION | GEORGETOWN, Georgetown, SC | Pass | State |
| 2026-02-24 | NISSAN NORTH AMERICA, INC.- SMYRNA | SMYRNA, Rutherford, TN | Pass | State |
| 2026-02-24 | NORTH LONGHORN CENTRAL TANK BATTERY | KARNES CITY, Karnes, TX | Pass | State |
| 2026-02-24 | NORTH LONGHORN CENTRAL TANK BATTERY | KARNES CITY, Karnes, TX | Pass | State |
| 2026-02-24 | NORTH LONGHORN CENTRAL TANK BATTERY | KARNES CITY, Karnes, TX | Pass | State |
| 2026-02-24 | NORTH LONGHORN CENTRAL TANK BATTERY | KARNES CITY, Karnes, TX | Pass | State |
| 2026-02-24 | NORTH LONGHORN CENTRAL TANK BATTERY | KARNES CITY, Karnes, TX | Pass | State |
| 2026-02-24 | WAPITI OPERATING LLC | UTAH, Undetermined, UT | Pass | State |
| 2026-02-24 | WAPITI OPERATING LLC | UTAH, Undetermined, UT | Pass | State |
| 2026-02-24 | WAPITI OPERATING LLC | UTAH, Undetermined, UT | Pass | State |
| 2026-02-24 | TESORO REFINING AND MARKETING COMPANY | ANACORTES, Skagit, WA | Pass | Local |
| 2026-02-24 | CARDINAL FG COMPANY | WINLOCK, Lewis, WA | Pass | Local |
| 2026-02-24 | ANR PIPELINE CO - KEWASKUM COMPRESSOR ST | ADELL, Taylor, WI | Pass | State |
| 2026-02-24 | COLUMBIA GAS TRANSMISSION, LLC, GLENVILLE | TRUEBADA, Gilmer, WV | Pass | State |
| 2026-02-24 | WESTLAKE NATRIUM LLC, WESTLAKE NATRIUM | PROCTOR, Marshall, WV | Pass | State |
| 2026-02-24 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-24 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-24 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-24 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-24 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-24 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-24 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-24 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-24 | NEWCASTLE REFINERY (WYOMING REFINING CO) | NEWCASTLE, Weston, WY | Pass | State |
| 2026-02-23 | RAZORBACK GATHERING COMPANY, LLC - HILLTOP COMPRESSOR STATION | CLINTON, Van Buren, AR | Pass | State |
| 2026-02-23 | RAZORBACK GATHERING COMPANY, LLC - HILLTOP COMPRESSOR STATION | CLINTON, Van Buren, AR | Pass | State |
| 2026-02-23 | WES WATTENBURG - CENTRAL OIL STABIL | HUDSON 6.1 MI. N OF, Weld, CO | Pass | State |
| 2026-02-23 | MIAMI-DADE WATER AND SEWER DEPARTMENT | HIALEAH, Miami-Dade, FL | Pass | State |
| 2026-02-23 | MIAMI-DADE WATER AND SEWER DEPARTMENT | HIALEAH, Miami-Dade, FL | Pass | State |
| 2026-02-23 | MIAMI-DADE WATER AND SEWER DEPARTMENT | HIALEAH, Miami-Dade, FL | Pass | State |
| 2026-02-23 | MIAMI-DADE WATER AND SEWER DEPARTMENT | HIALEAH, Miami-Dade, FL | Pass | State |
| 2026-02-23 | MIAMI-DADE WATER AND SEWER DEPARTMENT | HIALEAH, Miami-Dade, FL | Pass | State |
| 2026-02-23 | MIAMI-DADE WATER AND SEWER DEPARTMENT | HIALEAH, Miami-Dade, FL | Pass | State |
| 2026-02-23 | MIAMI-DADE WATER AND SEWER DEPARTMENT | HIALEAH, Miami-Dade, FL | Pass | State |
| 2026-02-23 | MIAMI-DADE WATER AND SEWER DEPARTMENT | HIALEAH, Miami-Dade, FL | Pass | State |
| 2026-02-23 | MIAMI-DADE WATER AND SEWER DEPARTMENT | HIALEAH, Miami-Dade, FL | Pass | State |
| 2026-02-23 | MIAMI-DADE WATER AND SEWER DEPARTMENT | HIALEAH, Miami-Dade, FL | Pass | State |
| 2026-02-23 | MIAMI-DADE WATER AND SEWER DEPARTMENT | HIALEAH, Miami-Dade, FL | Pass | State |
| 2026-02-23 | MIAMI-DADE WATER AND SEWER DEPARTMENT | HIALEAH, Miami-Dade, FL | Pass | State |
| 2026-02-23 | MIAMI-DADE WATER AND SEWER DEPARTMENT | HIALEAH, Miami-Dade, FL | Pass | State |
| 2026-02-23 | MIAMI-DADE WATER AND SEWER DEPARTMENT | HIALEAH, Miami-Dade, FL | Pass | State |
| 2026-02-23 | CLARIOS, LLC | TAMPA, Hillsborough, FL | Pass | State |
| 2026-02-23 | CLARIOS, LLC | TAMPA, Hillsborough, FL | Pass | State |
| 2026-02-23 | LEE COUNTY DEPT. OF SOLID WASTE MGT. | FORT MYERS, Lee, FL | Pass | State |
| 2026-02-23 | LEE COUNTY DEPT. OF SOLID WASTE MGT. | FORT MYERS, Lee, FL | Pass | State |
| 2026-02-23 | LEE COUNTY DEPT. OF SOLID WASTE MGT. | FORT MYERS, Lee, FL | Pass | State |
| 2026-02-23 | LEE COUNTY DEPT. OF SOLID WASTE MGT. | FORT MYERS, Lee, FL | Pass | State |
| 2026-02-23 | LEE COUNTY DEPT. OF SOLID WASTE MGT. | FORT MYERS, Lee, FL | Pass | State |
| 2026-02-23 | LEE COUNTY DEPT. OF SOLID WASTE MGT. | FORT MYERS, Lee, FL | Pass | State |
| 2026-02-23 | LEE COUNTY DEPT. OF SOLID WASTE MGT. | FORT MYERS, Lee, FL | Pass | State |
| 2026-02-23 | LEE COUNTY DEPT. OF SOLID WASTE MGT. | FORT MYERS, Lee, FL | Pass | State |
| 2026-02-23 | LEE COUNTY DEPT. OF SOLID WASTE MGT. | FORT MYERS, Lee, FL | Pass | State |
| 2026-02-23 | LEE COUNTY DEPT. OF SOLID WASTE MGT. | FORT MYERS, Lee, FL | Pass | State |
| 2026-02-23 | DUKE ENERGY FLORIDA, LLC | DE BARY-ORANGE CITY DIVISION, Volusia, FL | Pass | State |
| 2026-02-23 | DUKE ENERGY FLORIDA, LLC | DE BARY-ORANGE CITY DIVISION, Volusia, FL | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.