EPA Air · stack tests by year
Air-emissions stack tests in 2026
- 15,218Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
States, 2026
- Ohio 1,887
- California 1,849
- Indiana 1,315
- New Mexico 1,112
- Florida 1,099
- Wyoming 903
- Georgia 693
- Pennsylvania 636
- Arkansas 481
- Alabama 445
- Missouri 433
- Texas 337
- Mississippi 332
- Michigan 270
- Colorado 255
- Iowa 250
- North Carolina 239
- Illinois 224
- Wisconsin 190
- South Carolina 165
- Kansas 151
- West Virginia 140
- Virginia 119
- Montana 115
- Idaho 114
- Utah 109
- Minnesota 108
- Delaware 107
- Tennessee 106
- Kentucky 97
- Connecticut 92
- Washington 87
- Arizona 83
- Massachusetts 78
- Nebraska 74
- North Dakota 72
- New York 67
- Nevada 61
- Alaska 47
- New Hampshire 38
- South Dakota 36
- Louisiana 35
- District of Columbia 30
- Maryland 29
- Oregon 28
- Hawaii 24
- Rhode Island 19
- Maine 16
- Oklahoma 15
- Puerto Rico 6
Other years
Air-emissions stack tests recorded in 2026
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2026-11-05 | NAVY YARD PEAKER STATION — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Pending | Local |
| 2026-11-05 | NAVY YARD PEAKER STATION — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Pending | Local |
| 2026-11-05 | MERSEN USA GSTN CORP. | COLUMBIA, Maury, TN | Pending | State |
| 2026-11-04 | HARTFORD WATER POLLUTION CONTROL FACILITY — high-priority violation on file | HARTFORD, Hartford, CT | Pending | U.S. EPA |
| 2026-11-04 | NAVY YARD PEAKER STATION — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Pending | Local |
| 2026-11-03 | NAVY YARD PEAKER STATION — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Pending | Local |
| 2026-10-29 | UNITED ABRASIVES, INC — high-priority violation on file | WILLIMANTIC, Windham, CT | Pending | State |
| 2026-10-29 | UNITED ABRASIVES, INC — high-priority violation on file | WILLIMANTIC, Windham, CT | Pending | State |
| 2026-10-29 | GASTON COUNTY LANDFILL - HARDIN SITE | DALLAS, Gaston, NC | Pending | State |
| 2026-10-29 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | Pass | State |
| 2026-10-29 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | Pass | State |
| 2026-10-29 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | Pass | State |
| 2026-10-29 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | Pass | State |
| 2026-10-29 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | Pass | State |
| 2026-10-29 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | Pass | State |
| 2026-10-29 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | Pass | State |
| 2026-10-28 | UNITED ABRASIVES, INC — high-priority violation on file | WILLIMANTIC, Windham, CT | Pending | State |
| 2026-10-28 | UNITED ABRASIVES, INC — high-priority violation on file | WILLIMANTIC, Windham, CT | Pending | State |
| 2026-10-28 | PUROLITE INC/MFG CHEM — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Pending | Local |
| 2026-10-27 | KING ASPHALT, INC. - GASTONIA ASPHALT PLANT | GASTONIA, Gaston, NC | Pending | State |
| 2026-10-27 | MAYMEAD, INC. - MT AIRY PLANT — high-priority violation on file | MOUNT AIRY, Surry, NC | Pending | State |
| 2026-10-27 | PUROLITE INC/MFG CHEM — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Pending | Local |
| 2026-10-27 | MUELLER CO. LLC — high-priority violation on file | CHATTANOOGA, Hamilton, TN | Pass | Local |
| 2026-10-26 | C & H NORRIS CONSTRUCTION COMPANY, INC. | TABOR CITY, Columbus, NC | Pending | State |
| 2026-10-26 | ECOLAB, INC. | WILMINGTON, New Hanover, NC | Pending | State |
| 2026-10-26 | MUELLER CO. LLC — high-priority violation on file | CHATTANOOGA, Hamilton, TN | Pass | Local |
| 2026-10-23 | HOLCIM SOLUTIONS AND PRODUCTS US, LLC | BRISTOL, Hartford, CT | Pending | State |
| 2026-10-23 | INGENCO - CHESTER PLANT | CHESTER, Chesterfield, VA | Pending | State |
| 2026-10-23 | AMAZON DATA SERVICES INC - IAD-165/166/167/168/613 | HERNDON, Fairfax, VA | Pending | State |
| 2026-10-23 | PORT TOWNSEND PAPER CORPORATION — high-priority violation on file | PORT TOWNSEND, Jefferson, WA | Pending | State |
| 2026-10-22 | CITY OF LAURINBURG - YARD WASTE BURN SITE | LAURINBURG, Scotland, NC | Pending | State |
| 2026-10-22 | WESTROCK CP LLC - HOPEWELL | HOPEWELL, Hopewell (city), VA | Pending | State |
| 2026-10-21 | ARCHER DANIELS MIDLAND DM SOYBEAN PLANT | DES MOINES, Polk, IA | Pending | Local |
| 2026-10-21 | BILL BELLAMY & SONS, INC | CALABASH, Brunswick, NC | Pending | State |
| 2026-10-21 | C R JACKSON INC COLUMBIA PLANT #410 — high-priority violation on file | COLUMBIA, Richland, SC | Pending | State |
| 2026-10-20 | ALGONQUIN GAS TRANSMISSION LLC - OXFORD COMPRESSOR STATION | OXFORD, New Haven, CT | Pending | State |
| 2026-10-20 | WEYERHAEUSER-CFALLS — high-priority violation on file | COLUMBIA FALLS, Flathead, MT | Pass | State |
| 2026-10-20 | WEYERHAEUSER-CFALLS — high-priority violation on file | COLUMBIA FALLS, Flathead, MT | Fail | State |
| 2026-10-20 | WEYERHAEUSER-CFALLS — high-priority violation on file | COLUMBIA FALLS, Flathead, MT | Fail | State |
| 2026-10-20 | FSC II, LLC - WESTGATE ASPHALT PLANT | RALEIGH, Wake, NC | Pending | State |
| 2026-10-20 | CLARIOS LLC — high-priority violation on file | WEST UNION, Oconee, SC | Pending | State |
| 2026-10-20 | NAVY FEDERAL CREDIT UNION - FOLLIN LANE | VIENNA, Fairfax, VA | Pending | State |
| 2026-10-20 | AMAZON DATA SERVICES INC., IAD 550 LOUISA REB | MINERAL, Louisa, VA | Pending | State |
| 2026-10-20 | PORT TOWNSEND PAPER CORPORATION — high-priority violation on file | PORT TOWNSEND, Jefferson, WA | Pending | State |
| 2026-10-19 | BONANZA CREEK - STATE PRONGHORN CPF 41-3 | WIGGINS 11.6 MI. NW OF, Weld, CO | Pass | State |
| 2026-10-16 | CALAVERAS MATERIALS — high-priority violation on file | MERCED, Merced, CA | Pass | Local |
| 2026-10-16 | CALAVERAS MATERIALS — high-priority violation on file | MERCED, Merced, CA | Pass | Local |
| 2026-10-16 | VULCAN CONSTRUCTION MATERIALS, LLC - GOLD HILL QUARRY | GOLD HILL, Cabarrus, NC | Pending | State |
| 2026-10-16 | VULCAN CONSTRUCTION MATERIALS, LLC - ROCKINGHAM QUARRY | ROCKINGHAM, Richmond, NC | Pending | State |
| 2026-10-16 | CORPUS CHRISTI LIQUEFACTION — high-priority violation on file | GREGORY, San Patricio, TX | N/A | State |
| 2026-10-16 | CORPUS CHRISTI LIQUEFACTION — high-priority violation on file | GREGORY, San Patricio, TX | N/A | State |
| 2026-10-16 | INGENCO - BRUNSWICK PLANT | LAWRENCEVILLE, Brunswick, VA | Pending | State |
| 2026-10-15 | DCP OPERATING CO - ENTERPRISE C.S. — high-priority violation on file | KEENESBURG 5.2 MI. N OF, Weld, CO | Pass | State |
| 2026-10-15 | IKE WILLIAMSON SAND PIT, ACB | SHALLOTTE, Brunswick, NC | Pending | State |
| 2026-10-15 | BULLFROG BELLA DEBRIS SITE, LLC | LAKE WACCAMAW, Columbus, NC | Pending | State |
| 2026-10-15 | ORLA GAS PLANT | ORLA, Reeves, TX | Pass | State |
| 2026-10-15 | ORLA GAS PLANT | ORLA, Reeves, TX | Pass | State |
| 2026-10-15 | ORLA GAS PLANT | ORLA, Reeves, TX | Pass | State |
| 2026-10-15 | ORLA GAS PLANT | ORLA, Reeves, TX | Pass | State |
| 2026-10-15 | STACK INFRASTRUCTURE - SI NVA06A LLC | LEESBURG, Loudoun, VA | Pending | State |
| 2026-10-14 | GLOBAL NEW HAVEN TERMINALS, LLC — high-priority violation on file | NEW HAVEN, New Haven, CT | Pending | State |
| 2026-10-14 | WILSONART LLC | FLETCHER, Henderson, NC | Pending | State |
| 2026-10-14 | AMERICAN WOOD FIBERS - LAURINBURG — high-priority violation on file | LAURINBURG, Scotland, NC | Pending | State |
| 2026-10-14 | INGREDION INCORPORATED NORTH CHARLESTON PLANT | NORTH CHARLESTN, Charleston, SC | Pending | State |
| 2026-10-14 | PORT ARTHUR REFINERY — high-priority violation on file | PORT ARTHUR, Jefferson, TX | Pass | State |
| 2026-10-14 | HOWMET CASTINGS & SERVICES INC | HAMPTON, Hampton (city), VA | Pending | State |
| 2026-10-13 | MERIT ENERGY COMPANY, LLC - PRICE COMPRESSOR | RUSSELLVILLE, Pope, AR | Pass | State |
| 2026-10-13 | URBAN MINING CT LLC | BEACON FALLS, New Haven, CT | Pending | State |
| 2026-10-13 | HITCHINER MANUFACTURING CO., INC. | MILFORD, Hillsborough, NH | Pending | State |
| 2026-10-13 | COLUMBIA GAS TRANSMISSION CORPORATION | LOUISA, Louisa, VA | Pending | State |
| 2026-10-12 | SUNCORE CONSTRUCTION & MATERIALS 00734 | BOISE, Ada, ID | Pending | State |
| 2026-10-12 | UGI GIBRALTAR GATHERING LLC/GIBRALTAR COMP STA | CLAYSVILLE, Washington, PA | Pass | State |
| 2026-10-10 | MMGK ARKOMA, LLC. - KIBLER COMPRESSOR | KIBLER, Crawford, AR | Pass | State |
| 2026-10-09 | CMC STEEL FABRICATORS | MARICOPA COUNTY, Maricopa, AZ | Pending | Local |
| 2026-10-09 | NAUGATUCK WPCA/POTW | NAUGATUCK (HISTORICAL), New Haven, CT | Pending | State |
| 2026-10-09 | CITY OF WATERBURY WPCF | WATERBURY, New Haven, CT | Pending | State |
| 2026-10-09 | CAROLINA TREE AND LANDSCAPING | SUPPLY, Brunswick, NC | Pending | State |
| 2026-10-09 | EQM GATHERING OPCO LLC/MCINTOSH COMP STA | FINLEYVILLE, Washington, PA | Pass | State |
| 2026-10-09 | AMAZON DATA SERVICES INC IAD-169/179 | ASHBURN, Loudoun, VA | Pending | State |
| 2026-10-08 | ALABAMA POWER COMPANY (MILLER POWER PLANT) | QUINTON, Jefferson, AL | Pass | Local |
| 2026-10-08 | DESOTO GATHERING COMPANY, LLC - CHARLEY CPF-4 | HEBER SPRINGS, Cleburne, AR | Pass | State |
| 2026-10-08 | DESOTO GATHERING COMPANY, LLC - NEW QUITMAN CPF-2 | QUITMAN, Faulkner, AR | Pass | State |
| 2026-10-08 | GEORGIA-PACIFIC WOOD PRODUCTS LLC - DUDLEY PLYWOOD/CNS | DUDLEY, Wayne, NC | Pending | State |
| 2026-10-08 | TURNKEY RECYCLING & ENVIRONMENTAL ENTERPRISES | ROCHESTER, Strafford, NH | Pending | State |
| 2026-10-08 | TURNKEY RECYCLING & ENVIRONMENTAL ENTERPRISES | ROCHESTER, Strafford, NH | Pending | State |
| 2026-10-08 | BASF METALS LLC | SENECA, Oconee, SC | Pending | State |
| 2026-10-08 | DIGITAL REALTY (DIGITAL LOUDOUN 3 & 4, LLC) | ASHBURN, Loudoun, VA | Pending | State |
| 2026-10-07 | ALABAMA POWER COMPANY (MILLER POWER PLANT) | QUINTON, Jefferson, AL | Pass | Local |
| 2026-10-07 | DESOTO GATHERING COMPANY, LLC - COVE CREEK CPF-4 | DAMASCUS, Van Buren, AR | Pass | State |
| 2026-10-07 | DESOTO GATHERING COMPANY, LLC - COVE CREEK CPF-4 | DAMASCUS, Van Buren, AR | Pass | State |
| 2026-10-07 | INSULFOAM — high-priority violation on file | MARICOPA COUNTY, Maricopa, AZ | Pending | Local |
| 2026-10-07 | BUTTERFIELD STATION FACILITY | MARICOPA COUNTY, Maricopa, AZ | Pending | Local |
| 2026-10-07 | MARTIN MARIETTA MATERIALS, INC. - SIX MILE QUARRY | ROME, Floyd, GA | Pass | State |
| 2026-10-07 | CLEARWATER PAPER CORP-PPD | LEWISTON, Nez Perce, ID | Pending | State |
| 2026-10-07 | ARCONIC US LLC | ALCOA, Blount, TN | Pending | State |
| 2026-10-07 | ZAYO GROUP, LLC | ASHBURN, Loudoun, VA | Pending | State |
| 2026-10-07 | WESTROCK VIRGINIA LLC - COVINGTON | COVINGTON, Covington (city), VA | Pending | State |
| 2026-10-06 | DESOTO GATHERING COMPANY, LLC - SOUTH RAINBOW CPF-4 | CENTER RIDGE, Conway, AR | Pass | State |
| 2026-10-06 | DESOTO GATHERING COMPANY, LLC - STURGEON CPF-3 | CENTER RIDGE, Conway, AR | Pass | State |
| 2026-10-06 | STELLA-JONES CORPORATION | DELIGHT, Pike, AR | Pass | State |
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Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.
What this page shows
This page covers Clean Air Act facilities in the EPA air register with stack tests in 2026. It lists 11,110 stack tests recorded nationwide in 2026.