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 |
|---|---|---|---|---|
| 2026-02-25 | VENTURE GLOBAL PLAQUEMINES LNG LLC - PLAQUEMINES LNG TERMINAL | PORT SULPHUR, Plaquemines, LA | Pass | State |
| 2026-02-25 | RAVEN POWER FORT SMALLWOOD LLC | CURTIS BAY, Anne Arundel, MD | Pass | State |
| 2026-02-25 | UNIVERSITY OF MARYLAND CAPITAL REGION MEDICAL CENTER | LARGO, Prince George's, MD | Pass | State |
| 2026-02-25 | EASTON UTILITIES - WASHINGTON STREET | EASTON, Talbot, MD | Pass | State |
| 2026-02-25 | ND PAPER INC. | RUMFORD, Oxford, ME | Fail | State |
| 2026-02-25 | AXALTA COATING SYSTEMS USA LLC | MOUNT CLEMENS, Macomb, MI | Pass | State |
| 2026-02-25 | ALPEK POLYESTER MISSISSIPPI INC — high-priority violation on file | BAY ST. LOUI, Hancock, MS | Pass | State |
| 2026-02-25 | ALPEK POLYESTER MISSISSIPPI INC — high-priority violation on file | BAY ST. LOUI, Hancock, MS | Pass | State |
| 2026-02-25 | TRANSCONTINENTAL GAS PIPE LINE COMPANY LLC, COMPRESSOR STATION 80 | HEIDELBERG, Jones, MS | Pass | State |
| 2026-02-25 | GEORGIA PACIFIC MONTICELLO LLC | MONTICELLO, Lawrence, MS | Pass | State |
| 2026-02-25 | PCS PHOSPHATE COMPANY, INC. - AURORA | AURORA, Beaufort, NC | Pending | State |
| 2026-02-25 | CITY OF HIGH POINT - EASTSIDE WASTEWATER TREATMENT PLANT | JAMESTOWN, Guilford, NC | Pass | State |
| 2026-02-25 | ONEOK ROCKIES MIDSTREAM, L.L.C. - TREE TOP COMPRESSOR STATION | MEDORA, Billings, ND | Pass | State |
| 2026-02-25 | ACEC - AURORA COOPERATIVE WEST | AURORA, Hamilton, NE | Pass | State |
| 2026-02-25 | OPPD NEBRASKA CITY STATION | NEBRASKA CITY, Otoe, NE | Pass | State |
| 2026-02-25 | NPPD SHELDON STATION | HALLAM, Lancaster, NE | Pass | Local |
| 2026-02-25 | UNIVERSITY OF NEW HAMPSHIRE | DURHAM, Strafford, NH | Pass | State |
| 2026-02-25 | HF SINCLAIR NAVAJO REFINING LLC (ARTESIA) — high-priority violation on file | ARTESIA, Eddy, NM | Pass | State |
| 2026-02-25 | XTO - LOS DOS MEDANOS TANK BATTERY | MALAGA, Eddy, NM | Pass | State |
| 2026-02-25 | ZIA HILLS CENTRAL FACILITY | MALAGA, Lea, NM | Pass | State |
| 2026-02-25 | ZIA HILLS CENTRAL FACILITY | MALAGA, Lea, NM | Pass | State |
| 2026-02-25 | BLUEHOUND COMPRESSOR STATION | EUNICE, Lea, NM | Pass | State |
| 2026-02-25 | BLUEHOUND COMPRESSOR STATION | EUNICE, Lea, NM | Pass | State |
| 2026-02-25 | CORNING INCORPORATED - CANTON PLANT | DEKALB, St. Lawrence, NY | Pass | State |
| 2026-02-25 | WCAA MIDSTREAM LLC/WEITZ SOUTH 20 COMP STA | ADAMSBURG, Westmoreland, PA | Pass | State |
| 2026-02-25 | WILLIAMS FIELD SVC CO/MACNEW COMP STA | HOP BOTTOM, Susquehanna, PA | Pass | State |
| 2026-02-25 | JKLM ENERGY LLC/SWEDEN VALLEY 101 PAD | COUDERSPORT, Potter, PA | Pass | State |
| 2026-02-25 | EQT ARO LLC/ELBOW PAD B COMP STA — high-priority violation on file | COGAN HOUSE, Lycoming, PA | Pass | State |
| 2026-02-25 | JKLM ENERGY/SWEDEN VALLEY 105 WELL PAD | COUDERSPORT, Potter, PA | Pass | State |
| 2026-02-25 | EXPAND OPERATING LLC/RU-46 DROPP WELLPAD | SUSQUEHANNA, Susquehanna, PA | Pass | State |
| 2026-02-25 | EXPAND OPERATING LLC/RU-71 BLUE BECK WELLPAD | MILFORD, Susquehanna, PA | Pass | State |
| 2026-02-25 | JONES HAMILTON CO RICHBURG FACILITY | RICHBURG, Chester, SC | Pass | State |
| 2026-02-25 | EASLEY COMBINED UTILITIES | EASLEY, Pickens, SC | Incomplete | State |
| 2026-02-25 | KEMIRA WATER SOLUTIONS INC | EASTOVER, Richland, SC | Pass | State |
| 2026-02-25 | PRIMARY PRODUCTS INGREDIENTS AMERICAS LLC — high-priority violation on file | LOUDON, Loudon, TN | Pass | State |
| 2026-02-25 | WAPITI OPERATING LLC | UTAH, Undetermined, UT | Pass | State |
| 2026-02-25 | WAPITI OPERATING LLC | UTAH, Undetermined, UT | Pass | State |
| 2026-02-25 | WAPITI OPERATING LLC | UTAH, Undetermined, UT | Pass | State |
| 2026-02-25 | DOMINION ENERGY - VIRGINIA CITY HYBRID ENERGY CENTER | ST PAUL, Wise, VA | Pass | State |
| 2026-02-25 | TESORO REFINING AND MARKETING COMPANY | ANACORTES, Skagit, WA | Pass | Local |
| 2026-02-25 | ALTIVIA SERVICES, LLC, INSTITUTE PLANT | DUNBAR, Kanawha, WV | Pass | State |
| 2026-02-25 | WESTLAKE NATRIUM LLC, WESTLAKE NATRIUM | PROCTOR, Marshall, WV | Pass | State |
| 2026-02-25 | WESTLAKE NATRIUM LLC, WESTLAKE NATRIUM | PROCTOR, Marshall, WV | Pass | State |
| 2026-02-25 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-25 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-25 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-25 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-25 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-25 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-25 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2026-02-25 | BLACKS FORK GAS PLANT (HARVEST MIDSTREAM COMPANY) | GRANGER, Sweetwater, WY | Pass | State |
| 2026-02-25 | BLACKS FORK GAS PLANT (HARVEST MIDSTREAM COMPANY) | GRANGER, Sweetwater, WY | Pass | State |
| 2026-02-25 | BLACKS FORK GAS PLANT (HARVEST MIDSTREAM COMPANY) | GRANGER, Sweetwater, WY | Pass | State |
| 2026-02-24 | HIGH-PURITY SILICON AMERICA CORPORATION | THEODORE, Mobile, AL | Pass | State |
| 2026-02-24 | HIGH-PURITY SILICON AMERICA CORPORATION | THEODORE, Mobile, AL | Pass | State |
| 2026-02-24 | HIGH-PURITY SILICON AMERICA CORPORATION | THEODORE, Mobile, AL | Pass | State |
| 2026-02-24 | SANDERS LEAD CO | TROY, Pike, AL | Pass | State |
| 2026-02-24 | SANDERS LEAD CO | TROY, Pike, AL | Pass | State |
| 2026-02-24 | SANDERS LEAD CO | TROY, Pike, AL | Pass | State |
| 2026-02-24 | HARRELL'S COATING SOLUTIONS, LLC | SYLACAUGA, Talladega, AL | Pass | State |
| 2026-02-24 | DESOTO GATHERING COMPANY, LLC - CHARLEY CPF-4 | HEBER SPRINGS, Cleburne, AR | Pass | State |
| 2026-02-24 | DESOTO GATHERING COMPANY, LLC - COVE CREEK CPF-4 | DAMASCUS, Van Buren, AR | Pass | State |
| 2026-02-24 | PROCTER & GAMBLE PAPER PRODUCTS — high-priority violation on file | OXNARD, Ventura, CA | Fail | Local |
| 2026-02-24 | WASHINGTON DC CONVENTION CENTER — high-priority violation on file | WASHINGTON, District of Columbia, DC | Incomplete | State |
| 2026-02-24 | THE QUIKRETE COMPANIES, LLC | MIAMI, Miami-Dade, FL | Pass | State |
| 2026-02-24 | ANHEUSER-BUSCH, LLC | JACKSONVILLE, Duval, FL | Pass | State |
| 2026-02-24 | FLORIDA POWER & LIGHT (PMT) | PARRISH, Manatee, FL | Pass | State |
| 2026-02-24 | FLORIDA POWER & LIGHT COMPANY | PACE, Santa Rosa, FL | Pass | State |
| 2026-02-24 | DUVAL ASPHALT PRODUCTS, INC | GREEN COVE SPRINGS, Clay, FL | Pass | State |
| 2026-02-24 | CENTERS FOR DISEASE CONTROL AND PREVENTION (CDC) | ATLANTA, DeKalb, GA | Pass | State |
| 2026-02-24 | GEORGIA-PACIFIC SAVANNAH RIVER LLC | RINCON, Effingham, GA | Pass | State |
| 2026-02-24 | GEORGIA-PACIFIC SAVANNAH RIVER LLC | RINCON, Effingham, GA | Pass | State |
| 2026-02-24 | GEORGIA-PACIFIC SAVANNAH RIVER LLC | RINCON, Effingham, GA | Pass | State |
| 2026-02-24 | GEORGIA-PACIFIC SAVANNAH RIVER LLC | RINCON, Effingham, GA | Pass | State |
| 2026-02-24 | GEORGIA-PACIFIC SAVANNAH RIVER LLC | RINCON, Effingham, GA | Pass | State |
| 2026-02-24 | GEORGIA-PACIFIC SAVANNAH RIVER LLC | RINCON, Effingham, GA | Pass | State |
| 2026-02-24 | SOUTHERN POWER - WANSLEY COMBINED CYCLE | FRANKLIN, Heard, GA | Pass | State |
| 2026-02-24 | SOUTHERN POWER - WANSLEY COMBINED CYCLE | FRANKLIN, Heard, GA | Pass | State |
| 2026-02-24 | JEFFERSON COUNTY COMPRESSOR STATION | WRENS, Jefferson, GA | Pass | State |
| 2026-02-24 | SOUTHERN FLAVOR FARMS | FORT VALLEY, Peach, GA | Pass | State |
| 2026-02-24 | PAR - REFINERY — high-priority violation on file | KAPOLEI, Honolulu, HI | Fail | State |
| 2026-02-24 | SSAB IOWA INC — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2026-02-24 | SSAB IOWA INC — high-priority violation on file | MUSCATINE, Muscatine, IA | Fail | State |
| 2026-02-24 | SSAB IOWA INC — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2026-02-24 | FORT HALL MINE ROAD LANDFILL | POCATELLO, Bannock, ID | Pass | State |
| 2026-02-24 | ADM QUINCY — high-priority violation on file | QUINCY, Adams, IL | Pass | State |
| 2026-02-24 | ADM QUINCY — high-priority violation on file | QUINCY, Adams, IL | Pass | State |
| 2026-02-24 | GRAIN PROCESSING CORPORATION — high-priority violation on file | WASHINGTON, Daviess, IN | Pass | State |
| 2026-02-24 | GENERAL MOTORS LLC | BEDFORD, Lawrence, IN | Pass | State |
| 2026-02-24 | GENERAL MOTORS LLC | BEDFORD, Lawrence, IN | Pass | State |
| 2026-02-24 | GENERAL MOTORS LLC | BEDFORD, Lawrence, IN | Pass | State |
| 2026-02-24 | GENERAL MOTORS LLC | BEDFORD, Lawrence, IN | Pass | State |
| 2026-02-24 | GENERAL MOTORS LLC | BEDFORD, Lawrence, IN | Pass | State |
| 2026-02-24 | NATURAL GAS PIPELINE OF AMERICA - GLASCO STATION 105 (AIR) | GLASCO, Cloud, KS | Pass | State |
| 2026-02-24 | NORTH AMERICAN STAINLESS | GHENT, Carroll, KY | Pass | State |
| 2026-02-24 | DUNAWAY TIMBER CO PLANT 2 | FORDSVILLE, Ohio, KY | Pass | State |
| 2026-02-24 | SHADY GROVE ADVENTIST HOSPITAL | ROCKVILLE, Montgomery, MD | Pass | State |
| 2026-02-24 | PINE TREE ACRES, INC. | LENOX TOWNSHIP, Macomb, MI | Pass | State |
| 2026-02-24 | QUALA | CHESTERFIELD, Macomb, MI | Pass | State |
| 2026-02-24 | ENERGY DEVELOPMENTS GRAND BLANC, LLC | GRAND BLANC, Genesee, MI | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.