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 |
|---|---|---|---|---|
| 2025-09-11 | UNITED ABRASIVES, INC — high-priority violation on file | WILLIMANTIC, Windham, CT | Fail | State |
| 2025-09-11 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pass | State |
| 2025-09-11 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pass | State |
| 2025-09-11 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pass | State |
| 2025-09-11 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pass | State |
| 2025-09-11 | SEMINOLE ELECTRIC COOPERATIVE, INC. | PALATKA, Putnam, FL | Pass | State |
| 2025-09-11 | SUWANNEE AMERICAN CEMENT COMPANY, LLC. | SUMTERVILLE, Sumter, FL | Pass | State |
| 2025-09-11 | SUWANNEE AMERICAN CEMENT COMPANY, LLC. | SUMTERVILLE, Sumter, FL | Pass | State |
| 2025-09-11 | SUWANNEE AMERICAN CEMENT COMPANY, LLC. | SUMTERVILLE, Sumter, FL | Pass | State |
| 2025-09-11 | JOHNSON MATTHEY PROCESS TECHNOLOGIES, INC | SAVANNAH, Chatham, GA | Pass | State |
| 2025-09-11 | JOHNSON MATTHEY PROCESS TECHNOLOGIES, INC | SAVANNAH, Chatham, GA | Pass | State |
| 2025-09-11 | JOHNSON MATTHEY PROCESS TECHNOLOGIES, INC | SAVANNAH, Chatham, GA | Pass | State |
| 2025-09-11 | INTERNATIONAL PAPER COMPANY - ROME MILL | ROME, Floyd, GA | Pass | State |
| 2025-09-11 | INTERNATIONAL PAPER COMPANY - ROME MILL | ROME, Floyd, GA | Pass | State |
| 2025-09-11 | INTERNATIONAL PAPER COMPANY - ROME MILL | ROME, Floyd, GA | Pass | State |
| 2025-09-11 | BRUNSWICK CELLULOSE LLC | BRUNSWICK, Glynn, GA | Pass | State |
| 2025-09-11 | BRUNSWICK CELLULOSE LLC | BRUNSWICK, Glynn, GA | Pass | State |
| 2025-09-11 | BRUNSWICK CELLULOSE LLC | BRUNSWICK, Glynn, GA | Pass | State |
| 2025-09-11 | J R SIMPLOT COMPANY-DON SIDING POCATELLO — high-priority violation on file | POCATELLO, Power, ID | Pass | State |
| 2025-09-11 | CHARTER MANUFACTURING CO INC | WOODSTOCK, McHenry, IL | Pass | State |
| 2025-09-11 | NLMK INDIANA — high-priority violation on file | PORTAGE, Porter, IN | Pass | State |
| 2025-09-11 | NLMK INDIANA — high-priority violation on file | PORTAGE, Porter, IN | Pass | State |
| 2025-09-11 | NLMK INDIANA — high-priority violation on file | PORTAGE, Porter, IN | Pass | State |
| 2025-09-11 | NLMK INDIANA — high-priority violation on file | PORTAGE, Porter, IN | Fail | State |
| 2025-09-11 | NLMK INDIANA — high-priority violation on file | PORTAGE, Porter, IN | Pass | State |
| 2025-09-11 | NLMK INDIANA — high-priority violation on file | PORTAGE, Porter, IN | Fail | State |
| 2025-09-11 | MGPI PROCESSING (AIR) | ATCHISON, Atchison, KS | Pass | State |
| 2025-09-11 | CRRM REFINERY (AIR) | COFFEYVILLE, Montgomery, KS | Pass | State |
| 2025-09-11 | VANDERBILT CHEMICALS LLC | MURRAY, Calloway, KY | Pass | State |
| 2025-09-11 | VENTURE GLOBAL PLAQUEMINES LNG LLC - PLAQUEMINES LNG TERMINAL | PORT SULPHUR, Plaquemines, LA | Pass | State |
| 2025-09-11 | PITTSFIELD GENERATING COMPANY LP — high-priority violation on file | PITTSFIELD, TOWN OF, Berkshire, MA | Pass | State |
| 2025-09-11 | CONSTELLATION POWER - PERRYMAN POWER PLANT | ABERDEEN, Harford, MD | Pass | State |
| 2025-09-11 | CARBON GREEN BIOENERGY | LAKE ODESSA, Barry, MI | Pass | State |
| 2025-09-11 | CHEVRON USA INC, CHEVRON PRODUCTS COMPANY, PASCAGOULA REFINERY | PASCAGOULA, Jackson, MS | Pass | State |
| 2025-09-11 | WESTLAKE CHEMICALS AND VINYLS LLC | ABERDEEN, Monroe, MS | Pass | State |
| 2025-09-11 | WESTLAKE CHEMICALS AND VINYLS LLC | ABERDEEN, Monroe, MS | Pass | State |
| 2025-09-11 | WESTLAKE CHEMICALS AND VINYLS LLC | ABERDEEN, Monroe, MS | Pass | State |
| 2025-09-11 | WESTLAKE CHEMICALS AND VINYLS LLC | ABERDEEN, Monroe, MS | Pass | State |
| 2025-09-11 | GULF SOUTH PIPELINE COMPANY LLC, HARRISVILLE COMPRESSOR STATION | HARRISVILLE, Simpson, MS | Pass | State |
| 2025-09-11 | GULF SOUTH PIPELINE COMPANY LLC, HARRISVILLE COMPRESSOR STATION | HARRISVILLE, Simpson, MS | Pass | State |
| 2025-09-11 | GLOBAL COMPANIES - FAYETTEVILLE TERMINAL | FAYETTEVILLE, Cumberland, NC | Pending | State |
| 2025-09-11 | MERCK SHARP & DOHME LLC | DURHAM, Durham, NC | Pass | State |
| 2025-09-11 | WILBARA, LLC | WILMINGTON, New Hanover, NC | Pass | State |
| 2025-09-11 | WBI ENERGY TRANSMISSION, INC. - CHARBONNEAU COMPRESSOR STATION - AQ | CARTWRIGHT, McKenzie, ND | N/A | State |
| 2025-09-11 | VALDEZ BOOSTER STATION | LOVING, Eddy, NM | Pass | State |
| 2025-09-11 | EOG - EL JEFE LGL STATION | JAL, Lea, NM | Pass | State |
| 2025-09-11 | STRAWSER MATERIALS - HARMON PLANT — high-priority violation on file | COLUMBUS, Franklin, OH | Pass | State |
| 2025-09-11 | KOKOSING MATERIALS, INC. PLANT 504 | PITT, TOWNSHIP OF, Wyandot, OH | Pass | State |
| 2025-09-11 | EOG RESOURCES, INC. - LANDMAN GY CEN PAD | CAMBRIDGE, Guernsey, OH | Pass | State |
| 2025-09-11 | EOG RESOURCES, INC. - LANDMAN GY CEN PAD | CAMBRIDGE, Guernsey, OH | Pass | State |
| 2025-09-11 | EOG RESOURCES, INC. - LANDMAN GY CEN PAD | CAMBRIDGE, Guernsey, OH | Pass | State |
| 2025-09-11 | MARKWEST ARROWHEAD COMPRESSOR STATION | ATHENS, TOWNSHIP OF, Harrison, OH | Pass | State |
| 2025-09-11 | MARKWEST ARROWHEAD COMPRESSOR STATION | ATHENS, TOWNSHIP OF, Harrison, OH | Pass | State |
| 2025-09-11 | MARKWEST ARROWHEAD COMPRESSOR STATION | ATHENS, TOWNSHIP OF, Harrison, OH | Pass | State |
| 2025-09-11 | MARKWEST ARROWHEAD COMPRESSOR STATION | ATHENS, TOWNSHIP OF, Harrison, OH | Pass | State |
| 2025-09-11 | MARKWEST ARROWHEAD COMPRESSOR STATION | ATHENS, TOWNSHIP OF, Harrison, OH | Pass | State |
| 2025-09-11 | MARKWEST ARROWHEAD COMPRESSOR STATION | ATHENS, TOWNSHIP OF, Harrison, OH | Pass | State |
| 2025-09-11 | MARKWEST ARROWHEAD COMPRESSOR STATION | ATHENS, TOWNSHIP OF, Harrison, OH | Pass | State |
| 2025-09-11 | MARKWEST ARROWHEAD COMPRESSOR STATION | ATHENS, TOWNSHIP OF, Harrison, OH | Pass | State |
| 2025-09-11 | MARKWEST ARROWHEAD COMPRESSOR STATION | ATHENS, TOWNSHIP OF, Harrison, OH | Pass | State |
| 2025-09-11 | MARKWEST ARROWHEAD COMPRESSOR STATION | ATHENS, TOWNSHIP OF, Harrison, OH | Pass | State |
| 2025-09-11 | MARKWEST ARROWHEAD COMPRESSOR STATION | ATHENS, TOWNSHIP OF, Harrison, OH | Pass | State |
| 2025-09-11 | MARKWEST ARROWHEAD COMPRESSOR STATION | ATHENS, TOWNSHIP OF, Harrison, OH | Pass | State |
| 2025-09-11 | EOG RESOURCES, INC. - DEERSVILLE HN FRA PAD | DEERSVILLE, Harrison, OH | Pass | State |
| 2025-09-11 | EOG RESOURCES, INC. - DEERSVILLE HN FRA PAD | DEERSVILLE, Harrison, OH | Pass | State |
| 2025-09-11 | MPLX TERMINALS LLC - STEUBENVILLE TERMINAL | STEUBENVILLE, Jefferson, OH | Pass | State |
| 2025-09-11 | MARKWEST OKLAHOMA GAS CO LLC / BUTLER ARAPAHO GAS PLANT — high-priority violation on file | BUTLER, Custer, OK | Pass | State |
| 2025-09-11 | MARKWEST OKLAHOMA GAS CO LLC / BUTLER ARAPAHO GAS PLANT — high-priority violation on file | BUTLER, Custer, OK | Pass | State |
| 2025-09-11 | BCE MACH III LLC / LSEOU 26 2HO LSEOU 25 5HO PAD | DOVER, Kingfisher, OK | Pass | State |
| 2025-09-11 | BCE MACH III LLC / LSEOU 20 3HO LSEOU 21 2HO LSEOU 23 5HO | DOVER, Kingfisher, OK | Pass | State |
| 2025-09-11 | BOEING COMPANY (THE) — high-priority violation on file | PORTLAND, Multnomah, OR | Pass | State |
| 2025-09-11 | NLMK PENNSYLVANIA LLC/FARRELL PLT — high-priority violation on file | FARRELL, Mercer, PA | Pass | State |
| 2025-09-11 | ENERGY TRANSFER MKT & TERM LP/NORTHUMBERLAND TERM | NORTHUMBERLAND, Northumberland, PA | Pass | State |
| 2025-09-11 | WILLIAMS FIELD SVC CO LLC/LATHROP COMP STA | SPRINGVILLE, Susquehanna, PA | Pass | State |
| 2025-09-11 | REGENCY MARCELLUS GAS GATHERING LLC/ AUBURN STA | MESHOPPEN, Susquehanna, PA | Pass | State |
| 2025-09-11 | PUROLITE INC/MFG CHEM — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Pass | Local |
| 2025-09-11 | MANCHESTER STREET, LLC | PROVIDENCE, Providence, RI | Pass | State |
| 2025-09-11 | PL DEVELOPMENTS LLC — high-priority violation on file | PIEDMONT, Greenville, SC | Pass | State |
| 2025-09-11 | NUCOR STEEL | PLYMOUTH, Box Elder, UT | Pass | State |
| 2025-09-11 | INTERMOUNTAIN POWER SERVICE CORPORATION | DELTA, Millard, UT | Pass | State |
| 2025-09-11 | KAISER ALUMINUM WASHINGTON, LLC | SPOKANE, Spokane, WA | Pass | Local |
| 2025-09-11 | ROCK ROAD COMPANIES, INC. - TOWNLINE PIT | BELOIT, Rock, WI | Pass | State |
| 2025-09-11 | EUREKA MIDSTREAM, LLC, CARBIDE SITE | HASTINGS, Wetzel, WV | Pass | State |
| 2025-09-11 | LOVELL PLANT (GEORGIA-PACIFIC GYPSUM) | LOVELL, Big Horn, WY | Pass | State |
| 2025-09-11 | LOVELL PLANT (GEORGIA-PACIFIC GYPSUM) | LOVELL, Big Horn, WY | Pass | State |
| 2025-09-11 | LOVELL PLANT (GEORGIA-PACIFIC GYPSUM) | LOVELL, Big Horn, WY | Pass | State |
| 2025-09-11 | LOVELL PLANT (GEORGIA-PACIFIC GYPSUM) | LOVELL, Big Horn, WY | Pass | State |
| 2025-09-11 | LOVELL PLANT (GEORGIA-PACIFIC GYPSUM) | LOVELL, Big Horn, WY | Pass | State |
| 2025-09-11 | LOVELL PLANT (GEORGIA-PACIFIC GYPSUM) | LOVELL, Big Horn, WY | Pass | State |
| 2025-09-11 | LOVELL PLANT (GEORGIA-PACIFIC GYPSUM) | LOVELL, Big Horn, WY | Pass | State |
| 2025-09-11 | LOVELL PLANT (GEORGIA-PACIFIC GYPSUM) | LOVELL, Big Horn, WY | Pass | State |
| 2025-09-11 | LOVELL PLANT (GEORGIA-PACIFIC GYPSUM) | LOVELL, Big Horn, WY | Pass | State |
| 2025-09-11 | LOVELL PLANT (GEORGIA-PACIFIC GYPSUM) | LOVELL, Big Horn, WY | Pass | State |
| 2025-09-11 | LOVELL PLANT (GEORGIA-PACIFIC GYPSUM) | LOVELL, Big Horn, WY | Pass | State |
| 2025-09-11 | LOVELL PLANT (GEORGIA-PACIFIC GYPSUM) | LOVELL, Big Horn, WY | Pass | State |
| 2025-09-11 | LOVELL PLANT (GEORGIA-PACIFIC GYPSUM) | LOVELL, Big Horn, WY | Pass | State |
| 2025-09-11 | LOVELL PLANT (GEORGIA-PACIFIC GYPSUM) | LOVELL, Big Horn, WY | Pass | State |
| 2025-09-11 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-09-11 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-09-11 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.