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 |
|---|---|---|---|---|
| 2025-11-17 | DESOTO GATHERING COMPANY, LLC. - PUMA CPF-1 | HEBER SPRINGS, Cleburne, AR | Pass | State |
| 2025-11-17 | DESOTO GATHERING COMPANY, LLC. - PUMA CPF-1 | HEBER SPRINGS, Cleburne, AR | Pass | State |
| 2025-11-17 | MOSS LANDING POWER COMPANY LLC (FRMLY DYNEGY MOSS LANDING LLC) | MOSS LANDING, Monterey, CA | Pass | Local |
| 2025-11-17 | MOSS LANDING POWER COMPANY LLC (FRMLY DYNEGY MOSS LANDING LLC) | MOSS LANDING, Monterey, CA | Pass | Local |
| 2025-11-17 | LADW&P-HAYNES STEAM | LONG BEACH, Los Angeles, CA | Pass | Local |
| 2025-11-17 | HIGHPOINT - ANSCHUTZ EQUUS FARMS 4-62-15 | KERSEY 12.6 MI. E OF, Weld, CO | Pass | State |
| 2025-11-17 | HALIFAX PAVING, INC. | ORMOND BEACH, Volusia, FL | Pass | State |
| 2025-11-17 | ITAFOS CONDA LLC - TV FACILITY | SODA SPRINGS, Caribou, ID | Pass | State |
| 2025-11-17 | BLUE MOUND COMPRESSOR STATION | BLUE MOUND, Christian, IL | Pass | State |
| 2025-11-17 | BLUE MOUND COMPRESSOR STATION | BLUE MOUND, Christian, IL | Pass | State |
| 2025-11-17 | US ARMY GARRISON FORT KNOX | FORT KNOX, Hardin, KY | Pass | State |
| 2025-11-17 | PORTSMOUTH NAVAL SHIPYARD | KITTERY, York, ME | Pass | State |
| 2025-11-17 | PORTSMOUTH NAVAL SHIPYARD | KITTERY, York, ME | Pass | State |
| 2025-11-17 | AMRIZE CEMENT INC. — high-priority violation on file | ALPENA, Alpena, MI | Pass | State |
| 2025-11-17 | MINNESOTA POWER - HIBBARD RENEWABLE ENERGY CENTER | DULUTH, St. Louis, MN | Pass | State |
| 2025-11-17 | RAIDER COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2025-11-17 | BARNEY CTB | LIVINGSTON WHEELER, Eddy, NM | Pass | State |
| 2025-11-17 | ZIA HILLS CENTRAL FACILITY | MALAGA, Lea, NM | Pass | State |
| 2025-11-17 | ZIA HILLS CENTRAL FACILITY | MALAGA, Lea, NM | Pass | State |
| 2025-11-17 | ASCENT RESOURCES - UTICA LLC - JENNINGS WLS GR | LORE CITY, Guernsey, OH | Pass | State |
| 2025-11-17 | ASCENT RESOURCES - UTICA LLC - JENNINGS WLS GR | LORE CITY, Guernsey, OH | Pass | State |
| 2025-11-17 | ASCENT RESOURCES - UTICA LLC - JENNINGS WLS GR | LORE CITY, Guernsey, OH | Pass | State |
| 2025-11-17 | ASCENT RESOURCES - UTICA LLC - SLABAUGH RCH GR | SALESVILLE, Guernsey, OH | Pass | State |
| 2025-11-17 | ASCENT RESOURCES - UTICA LLC - SLABAUGH RCH GR | SALESVILLE, Guernsey, OH | Pass | State |
| 2025-11-17 | ASCENT RESOURCES - UTICA LLC - SLABAUGH RCH GR | SALESVILLE, Guernsey, OH | Pass | State |
| 2025-11-17 | EQT ARTEMIS MIDSTREAM LLC/ROGERS COMP STA — high-priority violation on file | NEW KENSINGTON, Westmoreland, PA | Pass | State |
| 2025-11-17 | PACIFICORP LAKESIDE (SUMMIT VINEYARD) | VINEYARD, Utah, UT | Pass | State |
| 2025-11-17 | PRCC COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-11-17 | PRCC COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-11-17 | PRCC COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-11-17 | PRCC COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-11-16 | GOLDEN PASS PIPELINE LLC - STARKS COMPRESSOR STATION | STARKS, Calcasieu, LA | Pass | State |
| 2025-11-16 | CLEAN HARBORS ARAGONITE/SAFETY KLEEN | ARAGONITE, Tooele, UT | Pass | State |
| 2025-11-15 | GOLDEN PASS PIPELINE LLC - STARKS COMPRESSOR STATION | STARKS, Calcasieu, LA | Pass | State |
| 2025-11-15 | GOLDEN PASS PIPELINE LLC - STARKS COMPRESSOR STATION | STARKS, Calcasieu, LA | Pass | State |
| 2025-11-15 | GOLDEN PASS PIPELINE LLC - STARKS COMPRESSOR STATION | STARKS, Calcasieu, LA | Pass | State |
| 2025-11-15 | RAGIN CAJUN 12 CTB 2 | JAL, Lea, NM | Pass | State |
| 2025-11-15 | ASCENT RESOURCES - BEACON CDZ HR | CADIZ, Harrison, OH | Pass | State |
| 2025-11-15 | ASCENT RESOURCES - BEACON CDZ HR | CADIZ, Harrison, OH | Pass | State |
| 2025-11-15 | ASCENT RESOURCES - BEACON CDZ HR | CADIZ, Harrison, OH | Pass | State |
| 2025-11-14 | NORTHWEST REGIONAL LANDFILL | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-11-14 | FLORIDA POWER & LIGHT COMPANY | CANTONMENT, Escambia, FL | Pass | State |
| 2025-11-14 | FLORIDA POWER & LIGHT COMPANY | CANTONMENT, Escambia, FL | Pass | State |
| 2025-11-14 | FLORIDA POWER & LIGHT COMPANY | CANTONMENT, Escambia, FL | Pass | State |
| 2025-11-14 | FLORIDA POWER & LIGHT COMPANY | CANTONMENT, Escambia, FL | Pass | State |
| 2025-11-14 | FLORIDA POWER & LIGHT COMPANY | CANTONMENT, Escambia, FL | Pass | State |
| 2025-11-14 | FLORIDA POWER & LIGHT COMPANY | CANTONMENT, Escambia, FL | Pass | State |
| 2025-11-14 | CENTERS FOR DISEASE CONTROL AND PREVENTION (CDC) | ATLANTA, DeKalb, GA | Pass | State |
| 2025-11-14 | SUNIVA, INC. | NORCROSS, Gwinnett, GA | Pass | State |
| 2025-11-14 | SUNIVA, INC. | NORCROSS, Gwinnett, GA | Pass | State |
| 2025-11-14 | ALOHA PETROLEUM - HONOLULU | HONOLULU, Honolulu, HI | Pass | State |
| 2025-11-14 | CITY OF EMPORIA - TRANSFER STATION (AIR) | EMPORIA, Lyon, KS | Pass | State |
| 2025-11-14 | GOLDEN PASS PIPELINE LLC - STARKS COMPRESSOR STATION | STARKS, Calcasieu, LA | Pass | State |
| 2025-11-14 | GOLDEN PASS PIPELINE LLC - STARKS COMPRESSOR STATION | STARKS, Calcasieu, LA | Pass | State |
| 2025-11-14 | SPRAGUE OPERATING RESOURCES LLC | SEARSPORT, Waldo, ME | Pass | State |
| 2025-11-14 | DTE ELECTRIC COMPANY - DEARBORN ENERGY CENTER | DEARBORN, Wayne, MI | Pass | State |
| 2025-11-14 | HANKINS LUMBER COMPANY INC, ELLIOTT — high-priority violation on file | ELLIOTT, Grenada, MS | Pass | State |
| 2025-11-14 | HANKINS LUMBER COMPANY INC, ELLIOTT — high-priority violation on file | ELLIOTT, Grenada, MS | Pass | State |
| 2025-11-14 | ENTERPRISE - OXY SAND DUNES NORTH COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2025-11-14 | ENTERPRISE - OXY SAND DUNES NORTH COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2025-11-14 | BULLDOG COMPRESSOR STATION | LOCO HILLS, Eddy, NM | Pass | State |
| 2025-11-14 | WALKER COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2025-11-14 | CABO WABO COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-11-14 | CABO WABO COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-11-14 | EOG - VALOR COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-11-14 | EOG - VIPER LOCALIZED GAS LIFT STATION | JAL, Lea, NM | Pass | State |
| 2025-11-14 | ASCENT RESOURCES - BEACON CDZ HR | CADIZ, Harrison, OH | Pass | State |
| 2025-11-14 | ASCENT RESOURCES - BEACON CDZ HR | CADIZ, Harrison, OH | Pass | State |
| 2025-11-14 | ASCENT RESOURCES - BEACON CDZ HR | CADIZ, Harrison, OH | Pass | State |
| 2025-11-14 | ROCKIES EXPRESS PIPELINE - SENECA COMPRESSOR STATION — high-priority violation on file | OHIO, Undetermined, OH | Pass | State |
| 2025-11-14 | ROCKIES EXPRESS PIPELINE - SENECA COMPRESSOR STATION — high-priority violation on file | OHIO, Undetermined, OH | Pass | State |
| 2025-11-14 | ROCKIES EXPRESS PIPELINE - SENECA COMPRESSOR STATION — high-priority violation on file | OHIO, Undetermined, OH | Pass | State |
| 2025-11-14 | ROCKIES EXPRESS PIPELINE - SENECA COMPRESSOR STATION — high-priority violation on file | OHIO, Undetermined, OH | Pass | State |
| 2025-11-14 | ROCKIES EXPRESS PIPELINE - SENECA COMPRESSOR STATION — high-priority violation on file | OHIO, Undetermined, OH | Pass | State |
| 2025-11-14 | ROCKIES EXPRESS PIPELINE - SENECA COMPRESSOR STATION — high-priority violation on file | OHIO, Undetermined, OH | Pass | State |
| 2025-11-14 | BNZ MATERIALS INC/ZELIENOPLE | ZELIENOPLE, Butler, PA | Pass | State |
| 2025-11-14 | BALL METAL BEVERAGE CONTAINER CORP/PITTSTON | PITTSTON, Luzerne, PA | Pass | State |
| 2025-11-14 | US MINT/PHILA | PHILADELPHIA, Philadelphia, PA | Pass | Local |
| 2025-11-14 | TORAY PLASTICS (AMERICA), INC. | NORTH KINGSTOWN, Washington, RI | Pass | State |
| 2025-11-14 | PORT ARTHUR REFINERY — high-priority violation on file | PORT ARTHUR, Jefferson, TX | Pass | State |
| 2025-11-14 | BASF TOTAL FINA NAFTA REGION OLEFINS COMPLEX — high-priority violation on file | PORT ARTHUR, Jefferson, TX | Pass | State |
| 2025-11-14 | BAYPORT POLYMERS | PORT ARTHUR, Jefferson, TX | Pass | State |
| 2025-11-14 | VANTAGE DATA CENTER VA3 LLC — high-priority violation on file | ASHBURN, Loudoun, VA | Pass | State |
| 2025-11-14 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-11-13 | WESTROCK MILL COMPANY LLC | DEMOPOLIS, Marengo, AL | Pass | State |
| 2025-11-13 | DESOTO GATHERING COMPANY, LLC - MIDGE CPF-2 | PANGBURN, White, AR | Pass | State |
| 2025-11-13 | DESOTO GATHERING COMPANY, LLC - MIDGE CPF-2 | PANGBURN, White, AR | Pass | State |
| 2025-11-13 | AERA ENERGY LLC | SAN ARDO, Monterey, CA | Pass | Local |
| 2025-11-13 | ARROWHEAD REGIONAL MEDICAL CENTER — high-priority violation on file | COLTON, San Bernardino, CA | Pass | Local |
| 2025-11-13 | ARROWHEAD REGIONAL MEDICAL CENTER — high-priority violation on file | COLTON, San Bernardino, CA | Pass | Local |
| 2025-11-13 | ARROWHEAD REGIONAL MEDICAL CENTER — high-priority violation on file | COLTON, San Bernardino, CA | Pass | Local |
| 2025-11-13 | BONANZA CREEK ENERGY- NORTH PLATTE 14-36 | KERSEY, Weld, CO | Fail | State |
| 2025-11-13 | BONANZA CREEK ENERGY- NORTH PLATTE 14-36 | KERSEY, Weld, CO | Fail | State |
| 2025-11-13 | FLORIDA POWER & LIGHT COMPANY (PCC) | COCOA, Brevard, FL | Pass | State |
| 2025-11-13 | TAMPA ELECTRIC COMPANY (TEC) | GIBSONTON, Hillsborough, FL | Pass | State |
| 2025-11-13 | NEW HOPE POWER COMPANY | SOUTH BAY, Palm Beach, FL | Pass | State |
| 2025-11-13 | NEW HOPE POWER COMPANY | SOUTH BAY, Palm Beach, FL | Pass | State |
| 2025-11-13 | NEW HOPE POWER COMPANY | SOUTH BAY, Palm Beach, FL | Pass | State |
| 2025-11-13 | NEW HOPE POWER COMPANY | SOUTH BAY, Palm Beach, FL | Pass | State |
| 2025-11-13 | NEW HOPE POWER COMPANY | SOUTH BAY, Palm Beach, FL | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.