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 |
|---|---|---|---|---|
| 2026-04-21 | OLMSTED COUNTY WASTE-TO-ENERGY FACILITY | ROCHESTER, Olmsted, MN | Pass | State |
| 2026-04-21 | METROPOLITAN ST. LOUIS SEWER DISTRICT | SAINT LOUIS COUNTY, St. Louis, MO | Pass | State |
| 2026-04-21 | GULF SOUTH PIPELINE COMPANY LLC, KILN COMPRESSOR STATION | KILN, Hancock, MS | Pass | State |
| 2026-04-21 | GULF SOUTH PIPELINE COMPANY LLC, KILN COMPRESSOR STATION | KILN, Hancock, MS | Pass | State |
| 2026-04-21 | DUKE ENERGY PROGRESS, LLC - RICHMOND COUNTY TURBINES | HAMLET, Richmond, NC | Pending | State |
| 2026-04-21 | HILAND PARTNERS HOLDINGS LLC - EPPING COMPRESSOR STATION | EPPING, Williams, ND | Pass | State |
| 2026-04-21 | KAAPA ETHANOL RAVENNA LLC — high-priority violation on file | RAVENNA, Buffalo, NE | Pass | State |
| 2026-04-21 | BIG LIZARD COMPRESSOR STATION | EUNICE, Lea, NM | Pass | State |
| 2026-04-21 | BANDIT COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-04-21 | BANDIT COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-04-21 | DARK HORSE TREATING FACILITY — high-priority violation on file | JAL, Lea, NM | Pass | State |
| 2026-04-21 | DARK HORSE TREATING FACILITY — high-priority violation on file | JAL, Lea, NM | Pass | State |
| 2026-04-21 | DARK HORSE TREATING FACILITY — high-priority violation on file | JAL, Lea, NM | Pass | State |
| 2026-04-21 | PEARL RIVER CAMPUS LLC | PEARL RIVER, Rockland, NY | Pass | State |
| 2026-04-21 | CHEMTRADE SOLUTIONS SYRACUSE | GEDDES, Onondaga, NY | Pass | State |
| 2026-04-21 | HILCORP ENERGY - ELK RUN WERTZ PRODUCTION FACILITY | LISBON, Columbiana, OH | Pass | State |
| 2026-04-21 | HILCORP ENERGY - ELK RUN WERTZ PRODUCTION FACILITY | LISBON, Columbiana, OH | Pass | State |
| 2026-04-21 | HILCORP ENERGY - ELK RUN WERTZ PRODUCTION FACILITY | LISBON, Columbiana, OH | Pass | State |
| 2026-04-21 | ASCENT RESOURCES - UTICA LLC - TARPLEY OXF GR | QUAKER CITY, Guernsey, OH | Pass | State |
| 2026-04-21 | ASCENT RESOURCES - UTICA LLC - TARPLEY OXF GR | QUAKER CITY, Guernsey, OH | Pass | State |
| 2026-04-21 | ASCENT RESOURCES - UTICA LLC - TARPLEY OXF GR | QUAKER CITY, Guernsey, OH | Pass | State |
| 2026-04-21 | EQM OLYMPUS MIDSTREAM, LLC - RIFLE COMPRESSOR STATION | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-04-21 | EQM OLYMPUS MIDSTREAM, LLC - RIFLE COMPRESSOR STATION | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-04-21 | EQM OLYMPUS MIDSTREAM, LLC - RIFLE COMPRESSOR STATION | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-04-21 | EQM OLYMPUS MIDSTREAM, LLC - RIFLE COMPRESSOR STATION | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-04-21 | EQM OLYMPUS MIDSTREAM, LLC - RIFLE COMPRESSOR STATION | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-04-21 | EQM OLYMPUS MIDSTREAM, LLC - RIFLE COMPRESSOR STATION | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-04-21 | NEATON AUTO PRODUCTS MANUFACTURING, INC. | EATON, Preble, OH | Pass | State |
| 2026-04-21 | NEATON AUTO PRODUCTS MANUFACTURING, INC. | EATON, Preble, OH | Pass | State |
| 2026-04-21 | CARGILL, INCORPORATED - SALT DIVISION | AKRON, Summit, OH | Pass | State |
| 2026-04-21 | PEOPLES NATURAL GAS CO LLC/GIRTY STA | SHELOCTA, Armstrong, PA | Pass | State |
| 2026-04-21 | WILLIAMS FIELD SVC CO LLC/SNAKE CREEK COMP STA | CLARKS SUMMIT, Susquehanna, PA | Pass | State |
| 2026-04-21 | HILCORP ENERGY CO/JEFFERSON MONTGOMERY STA | JEFFERSON TOWNSHIP, Mercer, PA | Pass | State |
| 2026-04-21 | MOGRIDGE, C. PAD 1 — high-priority violation on file | SPRINGVILLE, Susquehanna, PA | Pending | State |
| 2026-04-21 | LOCKHART POWER COMPANY | WELLFORD, Spartanburg, SC | Pass | State |
| 2026-04-21 | GREEN BAY METRO SEWERAGE DIST | GREEN BAY, Brown, WI | Pass | State |
| 2026-04-21 | VIRESCO TURTLE LAKE — high-priority violation on file | TURTLE LAKE, Barron, WI | Pass | State |
| 2026-04-21 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2026-04-21 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2026-04-21 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2026-04-21 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2026-04-21 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2026-04-20 | THUMS LONG BEACH CO — high-priority violation on file | LONG BEACH, Los Angeles, CA | Pass | Local |
| 2026-04-20 | PACIFIC ETHANOL STOCKTON — high-priority violation on file | STOCKTON, San Joaquin, CA | Pass | Local |
| 2026-04-20 | PACIFIC ETHANOL STOCKTON — high-priority violation on file | STOCKTON, San Joaquin, CA | Pass | Local |
| 2026-04-20 | WES DJ GATHERING - FREDERICK CS — high-priority violation on file | DACONO AREA, Weld, CO | Pass | State |
| 2026-04-20 | DCP OPERATING CO - ENTERPRISE C.S. — high-priority violation on file | KEENESBURG 5.2 MI. N OF, Weld, CO | Fail | State |
| 2026-04-20 | U.S. NAVY - PEARL HARBOR — high-priority violation on file | PEARL HARBOR, Honolulu, HI | Pass | State |
| 2026-04-20 | NORTHWEST PIPELINE GP OWYHEE | RIDDLE, Owyhee, ID | Pass | State |
| 2026-04-20 | WAUKEGAN ELECTRIC GENERATING STATION | WAUKEGAN, Lake, IL | Pass | State |
| 2026-04-20 | WAUKEGAN ELECTRIC GENERATING STATION | WAUKEGAN, Lake, IL | Pass | State |
| 2026-04-20 | WAUKEGAN ELECTRIC GENERATING STATION | WAUKEGAN, Lake, IL | Pass | State |
| 2026-04-20 | WEST END DISPOSAL FACILITY | THOMPSONVILLE, Saline, IL | Pass | State |
| 2026-04-20 | THE ANDERSONS RENEWABLES LLC — high-priority violation on file | LOGANSPORT, Cass, IN | Pass | State |
| 2026-04-20 | THE ANDERSONS RENEWABLES LLC — high-priority violation on file | LOGANSPORT, Cass, IN | Pass | State |
| 2026-04-20 | THE ANDERSONS RENEWABLES LLC — high-priority violation on file | LOGANSPORT, Cass, IN | Pass | State |
| 2026-04-20 | ATLAS FOUNDRY COMPANY INC | MARION, Grant, IN | Pass | State |
| 2026-04-20 | MID-STATES MATERIALS - EDGERTON QUARRY | EDGERTON, Johnson, KS | Pass | State |
| 2026-04-20 | HARSHMAN CONST (MASTER EQUIP LIST) (AIR) | CEDAR POINT, Marion, KS | Pass | State |
| 2026-04-20 | CENTURY ALUMINUM SEBREE LLC | ROBARDS, Henderson, KY | Pass | State |
| 2026-04-20 | GRANGER GRAND RIVER AVENUE LANDFILL | GRAND LEDGE, Clinton, MI | Pass | State |
| 2026-04-20 | JBS WORTHINGTON MN | WORTHINGTON, Nobles, MN | Pass | State |
| 2026-04-20 | CHEMOURS COMPANY FC LLC THE, DELISLE PLANT | PASS CHRISTI, Harrison, MS | Pass | State |
| 2026-04-20 | CHEMOURS COMPANY FC LLC THE, DELISLE PLANT | PASS CHRISTI, Harrison, MS | Pass | State |
| 2026-04-20 | CHEMOURS COMPANY FC LLC THE, DELISLE PLANT | PASS CHRISTI, Harrison, MS | Pass | State |
| 2026-04-20 | CHEMOURS COMPANY FC LLC THE, DELISLE PLANT | PASS CHRISTI, Harrison, MS | Pass | State |
| 2026-04-20 | SALT FLATS GAS SALES COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-04-20 | SALT FLATS GAS SALES COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-04-20 | RED RAIDER COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2026-04-20 | RED RAIDER COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2026-04-20 | BIG LIZARD COMPRESSOR STATION | EUNICE, Lea, NM | Pass | State |
| 2026-04-20 | BIG LIZARD COMPRESSOR STATION | EUNICE, Lea, NM | Pass | State |
| 2026-04-20 | RANGER PEAK COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-04-20 | MIDDLETOWN COKE COMPANY, LLC — high-priority violation on file | MIDDLETOWN, Butler, OH | Pass | State |
| 2026-04-20 | LAUREL MTN MIDSTREAM OPR LLC/BROWN COMP STA | GREENSBORO, Greene, PA | Pass | State |
| 2026-04-20 | HILCORP ENERGY CO/MAHONING SIEGEL FACILITY — high-priority violation on file | EDINBURG, Lawrence, PA | Pass | State |
| 2026-04-20 | EMPIRE PIPELINE INC/JACKSON COMP STA | LAWRENCEVILLE, Tioga, PA | Pass | State |
| 2026-04-20 | HILCORP ENERGY CO/NORTH BEAVER KEPHART PROD FAC | ENON VALLEY, Lawrence, PA | Pass | State |
| 2026-04-20 | PENNAY, G PAD 1 | KINGSLEY, Susquehanna, PA | Pass | State |
| 2026-04-20 | TSOUROUS, A. PAD 1 | MONTROSE, Susquehanna, PA | Pass | State |
| 2026-04-20 | TRANSCO COMPRESSOR STATIONS 165 AND 166 | CHATHAM, Pittsylvania, VA | Pass | State |
| 2026-04-20 | PROAMPAC MENASHA — high-priority violation on file | MENASHA, Wood, WI | Pass | State |
| 2026-04-20 | COLUMBIA GAS TRANSMISSION, LLC, SHERWOOD STATION | SHERWOOD, Doddridge, WV | Pass | State |
| 2026-04-19 | INTERNATIONAL PAPER COMPANY - ROME MILL | ROME, Floyd, GA | Pass | State |
| 2026-04-18 | SECTION 9 COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-04-17 | MAS GEORGIA LFG, LLC (PINE RIDGE) | GRIFFIN, Butts, GA | Pass | State |
| 2026-04-17 | MAS GEORGIA LFG, LLC (PINE RIDGE) | GRIFFIN, Butts, GA | Pass | State |
| 2026-04-17 | MAS GEORGIA LFG, LLC (PINE RIDGE) | GRIFFIN, Butts, GA | Pass | State |
| 2026-04-17 | TROJAN BATTERY COMPANY, LLC | LITHONIA, DeKalb, GA | Pass | State |
| 2026-04-17 | GREEN POWER SOLUTIONS OF GEORGIA | DUBLIN, Laurens, GA | Pass | State |
| 2026-04-17 | GREEN POWER SOLUTIONS OF GEORGIA | DUBLIN, Laurens, GA | Pass | State |
| 2026-04-17 | GREEN POWER SOLUTIONS OF GEORGIA | DUBLIN, Laurens, GA | Pass | State |
| 2026-04-17 | GREEN POWER SOLUTIONS OF GEORGIA | DUBLIN, Laurens, GA | Pass | State |
| 2026-04-17 | NORTHWEST PIPELINE LLC LAVA HOT SPRINGS | TOPAZ (HISTORICAL), Bannock, ID | Pass | State |
| 2026-04-17 | CLARIOS LLC | GENEVA, Kane, IL | Pass | State |
| 2026-04-17 | CLARIOS LLC | GENEVA, Kane, IL | Pass | State |
| 2026-04-17 | HEARTLAND RURAL ELECTRIC - COLUMBUS SUBSTATION | COLUMBUS, Cherokee, KS | Pass | State |
| 2026-04-17 | HEARTLAND RURAL ELECTRIC - WEIR | WEIR, Cherokee, KS | Pass | State |
| 2026-04-17 | HEARTLAND RURAL ELECTRIC - GREENBUSH | GIRARD, Crawford, KS | Pass | State |
| 2026-04-17 | HEARTLAND RURAL ELECTRIC - WALNUT | WALNUT, Crawford, KS | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.