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 |
|---|---|---|---|---|
| 2025-10-14 | HILLS PET NUTRITION — high-priority violation on file | RICHMOND, Wayne, IN | Fail | State |
| 2025-10-14 | HILLS PET NUTRITION — high-priority violation on file | RICHMOND, Wayne, IN | Fail | State |
| 2025-10-14 | HILLS PET NUTRITION — high-priority violation on file | RICHMOND, Wayne, IN | Pass | State |
| 2025-10-14 | HILLS PET NUTRITION — high-priority violation on file | RICHMOND, Wayne, IN | Pass | State |
| 2025-10-14 | ROBBINS LUMBER, INC. | SEARSMONT, Waldo, ME | Pass | State |
| 2025-10-14 | GRAYLING GENERATING STATION LTD PARTNER | GRAYLING, Crawford, MI | Pass | State |
| 2025-10-14 | HYUNDAI AMERICA TECHNICAL CENTER INC. (HATCI) | YPSILANTI, Washtenaw, MI | Pass | State |
| 2025-10-14 | SAPPI CLOQUET LLC | CLOQUET, Carlton, MN | Pass | State |
| 2025-10-14 | EGA SPECTRO ALLOYS | ROSEMOUNT, Dakota, MN | Pass | State |
| 2025-10-14 | HEARTLAND CORN PRODUCTS | WINTHROP, Sibley, MN | Pass | State |
| 2025-10-14 | SPECIALTY GRANULES | ANNAPOLIS, Iron, MO | Pass | State |
| 2025-10-14 | SPECIALTY GRANULES | ANNAPOLIS, Iron, MO | Pass | State |
| 2025-10-14 | SPECIALTY GRANULES | ANNAPOLIS, Iron, MO | Pass | State |
| 2025-10-14 | SPECIALTY GRANULES | ANNAPOLIS, Iron, MO | Pass | State |
| 2025-10-14 | SPECIALTY GRANULES | ANNAPOLIS, Iron, MO | Pass | State |
| 2025-10-14 | SPECIALTY GRANULES | ANNAPOLIS, Iron, MO | Pass | State |
| 2025-10-14 | SPECIALTY GRANULES | ANNAPOLIS, Iron, MO | Pass | State |
| 2025-10-14 | SPECIALTY GRANULES | ANNAPOLIS, Iron, MO | Pass | State |
| 2025-10-14 | SPECIALTY GRANULES | ANNAPOLIS, Iron, MO | Pass | State |
| 2025-10-14 | SPECIALTY GRANULES | ANNAPOLIS, Iron, MO | Pass | State |
| 2025-10-14 | SPECIALTY GRANULES | ANNAPOLIS, Iron, MO | Pass | State |
| 2025-10-14 | SPECIALTY GRANULES | ANNAPOLIS, Iron, MO | Pass | State |
| 2025-10-14 | SPECIALTY GRANULES | ANNAPOLIS, Iron, MO | Pass | State |
| 2025-10-14 | SPECIALTY GRANULES | ANNAPOLIS, Iron, MO | Pass | State |
| 2025-10-14 | SPECIALTY GRANULES | ANNAPOLIS, Iron, MO | Pass | State |
| 2025-10-14 | SPECIALTY GRANULES | ANNAPOLIS, Iron, MO | Pass | State |
| 2025-10-14 | SPECIALTY GRANULES | ANNAPOLIS, Iron, MO | Pass | State |
| 2025-10-14 | SPECIALTY GRANULES | ANNAPOLIS, Iron, MO | Pass | State |
| 2025-10-14 | SPECIALTY GRANULES | ANNAPOLIS, Iron, MO | Pass | State |
| 2025-10-14 | SPECIALTY GRANULES | ANNAPOLIS, Iron, MO | Pass | State |
| 2025-10-14 | COOPERATIVE ENERGY, A MISSISSIPPI ELECTRIC COOPERATIVE, BENNDALE PEAKING STATION — high-priority violation on file | BENNDALE, George, MS | Pass | State |
| 2025-10-14 | COOPERATIVE ENERGY, A MISSISSIPPI ELECTRIC COOPERATIVE, BENNDALE PEAKING STATION — high-priority violation on file | BENNDALE, George, MS | Pass | State |
| 2025-10-14 | COOPERATIVE ENERGY, A MISSISSIPPI ELECTRIC COOPERATIVE, BENNDALE PEAKING STATION — high-priority violation on file | BENNDALE, George, MS | Pass | State |
| 2025-10-14 | INTERNATIONAL BROADCASTING BUREAU - TRANSMITTER SITE B | GRIMESLAND, Pitt, NC | Pass | State |
| 2025-10-14 | TOYOTA BATTERY MFG. INC. DBA TOYOTA BATTERY MANUFACTURING NC | LIBERTY, Randolph, NC | Pass | State |
| 2025-10-14 | CAROLINA STALITE COMPANY | GOLD HILL, Rowan, NC | Pending | State |
| 2025-10-14 | SCOTT TECHNOLOGIES, INC. - SCOTT SAFETY | MONROE, Union, NC | Pass | State |
| 2025-10-14 | BASIN ELECTRIC POWER COOPERATIVE - PIONEER GENERATION STATION - AQ | WILLISTON, Williams, ND | Pass | State |
| 2025-10-14 | CABO WABO COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-10-14 | EOG - ALADDIN COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-10-14 | EOG - ALADDIN COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-10-14 | EOG - ALADDIN COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-10-14 | MILKY WAY COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-10-14 | MILKY WAY COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-10-14 | COMANCHE PEAK COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-10-14 | COMANCHE PEAK COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-10-14 | TITAN COMPRESSOR STATION | MALAGA, Lea, NM | Pass | State |
| 2025-10-14 | THE DUDE PROCESSING PLANT — high-priority violation on file | MONUMENT, Lea, NM | Pass | State |
| 2025-10-14 | THE DUDE PROCESSING PLANT — high-priority violation on file | MONUMENT, Lea, NM | Pass | State |
| 2025-10-14 | INNOVATIVE / FULTON | JOHNSTOWN(T), Fulton, NY | Pass | State |
| 2025-10-14 | LIBERTY CASTING INC. — high-priority violation on file | DELAWARE, Delaware, OH | Fail | State |
| 2025-10-14 | ASCENT RESOURCES - BEACON CDZ HR | CADIZ, Harrison, OH | Pass | State |
| 2025-10-14 | ASCENT RESOURCES - BEACON CDZ HR | CADIZ, Harrison, OH | Pass | State |
| 2025-10-14 | ASCENT RESOURCES - BEACON CDZ HR | CADIZ, Harrison, OH | Pass | State |
| 2025-10-14 | ASCENT RESOURCES - BEACON CDZ HR | CADIZ, Harrison, OH | Pass | State |
| 2025-10-14 | ASCENT RESOURCES - BEACON CDZ HR | CADIZ, Harrison, OH | Pass | State |
| 2025-10-14 | ASCENT RESOURCES - BEACON CDZ HR | CADIZ, Harrison, OH | Pass | State |
| 2025-10-14 | ASCENT RESOURCES - DOMINO CDZ HR | CADIZ, Harrison, OH | Pass | State |
| 2025-10-14 | ASCENT RESOURCES - DOMINO CDZ HR | CADIZ, Harrison, OH | Pass | State |
| 2025-10-14 | ASCENT RESOURCES - DOMINO CDZ HR | CADIZ, Harrison, OH | Pass | State |
| 2025-10-14 | TOM STACK LLC / COOP COMPRESSOR FACILITY | OKARCHE, Kingfisher, OK | Pass | State |
| 2025-10-14 | FRES-CO SYSTEM USA INC/TELFORD PLT — high-priority violation on file | TELFORD, Bucks, PA | Pass | State |
| 2025-10-14 | MONROE ENERGY LLC/TRAINER — high-priority violation on file | TRAINER, Delaware, PA | Pass | State |
| 2025-10-14 | WILLIAMS FIELD SVC CO LLC/WILCOX COMP STA | TUNKHANNOCK, Wyoming, PA | Pass | State |
| 2025-10-14 | NFG MIDSTREAM CLERMONT LLC/CLERMONT EAST COMP STA | WILCOX, McKean, PA | Pass | State |
| 2025-10-14 | EQM GATHERING OPCO LLC/MCINTOSH COMP STA | FINLEYVILLE, Washington, PA | Pass | State |
| 2025-10-14 | EQM GATHERING OPCO LLC/MCINTOSH COMP STA | FINLEYVILLE, Washington, PA | Pass | State |
| 2025-10-14 | WCAA UPSTREAM LLC/GRAHAM WELLPAD | DARRAGH, Westmoreland, PA | Pass | State |
| 2025-10-14 | AB MAURI FOOD INC | MEMPHIS, Shelby, TN | Pass | Local |
| 2025-10-14 | NYDIG DFM LLC - DUCHESNE DATA POWER STATION (FORMERLY CRUSOE ENERGY SYSTEMS) | UPALCO, Duchesne, UT | Pass | State |
| 2025-10-14 | MANITOWOC PUBLIC UTILITIES | MANITOWOC, Manitowoc, WI | Pass | State |
| 2025-10-14 | INDECK LADYSMITH LLC | LADYSMITH, Rusk, WI | Pass | State |
| 2025-10-14 | NEENAH FOUNDRY COMPANY - NEENAH OPERATIONS (W2179) — high-priority violation on file | NEENAH, Wood, WI | Pass | State |
| 2025-10-14 | WVA MANUFACTURING, LLC, ALLOY — high-priority violation on file | ALLOY, Fayette, WV | Fail | State |
| 2025-10-14 | TABLE MOUNTAIN - CHAIR COMPRESSOR STATION (PRONGHORN MIDSTREAM LLC) | JOHNSON COUNTY, Johnson, WY | Pass | State |
| 2025-10-14 | TABLE MOUNTAIN - CHAIR COMPRESSOR STATION (PRONGHORN MIDSTREAM LLC) | JOHNSON COUNTY, Johnson, WY | Pass | State |
| 2025-10-14 | TABLE MOUNTAIN - CHAIR COMPRESSOR STATION (PRONGHORN MIDSTREAM LLC) | JOHNSON COUNTY, Johnson, WY | Pass | State |
| 2025-10-13 | RAZORBACK GATHERING COMPANY, LLC. - HARMONY CPF 1 | SEARCY, White, AR | Pass | State |
| 2025-10-13 | DESOTO GATHERING COMPANY, LLC - TIGER CPF 2 | JUDSONIA, White, AR | Pass | State |
| 2025-10-13 | DUKE ENERGY FLORIDA, LLC | INTERCESSION CITY, Osceola, FL | Pass | State |
| 2025-10-13 | DUKE ENERGY FLORIDA, LLC | INTERCESSION CITY, Osceola, FL | Pass | State |
| 2025-10-13 | DUKE ENERGY FLORIDA, LLC | INTERCESSION CITY, Osceola, FL | Pass | State |
| 2025-10-13 | BROOKS CONSTRUCTION COMPANY INCORPORATED | WARSAW, Kosciusko, IN | Pass | State |
| 2025-10-13 | BROOKS CONSTRUCTION COMPANY INCORPORATED | WARSAW, Kosciusko, IN | Pass | State |
| 2025-10-13 | BROOKS CONSTRUCTION COMPANY INCORPORATED | WARSAW, Kosciusko, IN | Pass | State |
| 2025-10-13 | BROOKS CONSTRUCTION COMPANY INCORPORATED | WARSAW, Kosciusko, IN | Pass | State |
| 2025-10-13 | CENTURY ALUMINUM SEBREE LLC | ROBARDS, Henderson, KY | Pass | State |
| 2025-10-13 | MILFORD REGIONAL MEDICAL CENTER INC | MILFORD, TOWN OF, Worcester, MA | Pending | State |
| 2025-10-13 | UNITED TACONITE LLC - FAIRLANE PLANT | FORBES, St. Louis, MN | Pass | State |
| 2025-10-13 | SUPERIOR MINERALS CO | SAVAGE, Scott, MN | Pass | State |
| 2025-10-13 | W.L. MILLER COMPANY INC. | KIRKSVILLE, Adair, MO | Pass | State |
| 2025-10-13 | DESTIN PIPELINE COMPANY LLC, PASCAGOULA COMPRESSOR STATION | MOSS POINT, Jackson, MS | Pass | State |
| 2025-10-13 | DESTIN PIPELINE COMPANY LLC, PASCAGOULA COMPRESSOR STATION | MOSS POINT, Jackson, MS | Pass | State |
| 2025-10-13 | TOYOTA BATTERY MFG. INC. DBA TOYOTA BATTERY MANUFACTURING NC | LIBERTY, Randolph, NC | Pass | State |
| 2025-10-13 | PETRY BOOSTER STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-10-13 | PETRY BOOSTER STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-10-13 | PETRY BOOSTER STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-10-13 | PETRY BOOSTER STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-10-13 | EOG - ALADDIN COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-10-13 | EOG - ALADDIN COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.