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 |
|---|---|---|---|---|
| 2025-09-26 | LA CITY, DWP HARBOR GENERATING STATION | WILMINGTON, Los Angeles, CA | Pass | Local |
| 2025-09-26 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pass | State |
| 2025-09-26 | THE KEEP CAMPUS | LITHIA SPRINGS, Douglas, GA | Pass | State |
| 2025-09-26 | ROCHESTER METAL PRODUCTS CORPORATION — high-priority violation on file | ROCHESTER, Fulton, IN | Pass | State |
| 2025-09-26 | ROCHESTER METAL PRODUCTS CORPORATION — high-priority violation on file | ROCHESTER, Fulton, IN | Pass | State |
| 2025-09-26 | ROCHESTER METAL PRODUCTS CORPORATION — high-priority violation on file | ROCHESTER, Fulton, IN | Pass | State |
| 2025-09-26 | ROCHESTER METAL PRODUCTS CORPORATION — high-priority violation on file | ROCHESTER, Fulton, IN | Pass | State |
| 2025-09-26 | DAVE OMARA CONTRACTOR INC PLANT 6 | LEXINGTON, Scott, IN | Pass | State |
| 2025-09-26 | DAVE OMARA CONTRACTOR INC PLANT 6 | LEXINGTON, Scott, IN | Pass | State |
| 2025-09-26 | DAVE OMARA CONTRACTOR INC PLANT 6 | LEXINGTON, Scott, IN | Pass | State |
| 2025-09-26 | DAVE OMARA CONTRACTOR INC PLANT 6 | LEXINGTON, Scott, IN | Pass | State |
| 2025-09-26 | JERRY DAVID ENTERPRISES DBA DAVID ENTERPRISES INCORPORATED — high-priority violation on file | EVANSVILLE, Vanderburgh, IN | Pass | State |
| 2025-09-26 | JERRY DAVID ENTERPRISES DBA DAVID ENTERPRISES INCORPORATED — high-priority violation on file | EVANSVILLE, Vanderburgh, IN | Pass | State |
| 2025-09-26 | JERRY DAVID ENTERPRISES DBA DAVID ENTERPRISES INCORPORATED — high-priority violation on file | EVANSVILLE, Vanderburgh, IN | Pass | State |
| 2025-09-26 | JERRY DAVID ENTERPRISES DBA DAVID ENTERPRISES INCORPORATED — high-priority violation on file | EVANSVILLE, Vanderburgh, IN | Pass | State |
| 2025-09-26 | CADILAC ASPHALT PRODUCTS - DIX | DETROIT, Wayne, MI | Pass | State |
| 2025-09-26 | GERDAU MACSTEEL MONROE MILL — high-priority violation on file | MONROE, Monroe, MI | Pass | State |
| 2025-09-26 | LONGWOOD - STEBBINS COMPRESSOR STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2025-09-26 | NITRO COMPRESSOR STATION | EUNICE, Lea, NM | Pass | State |
| 2025-09-26 | RHEA LGL STATION | MALAGA, Lea, NM | Pass | State |
| 2025-09-26 | RJ BOOSTER GCP4-3808 | SANTA FE, Santa Fe, NM | Pass | State |
| 2025-09-26 | KINGS PLAZA ENERGY LLC | BROOKLYN, Kings, NY | Pass | State |
| 2025-09-26 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2025-09-26 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2025-09-26 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2025-09-26 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2025-09-26 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2025-09-26 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2025-09-26 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2025-09-26 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2025-09-26 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2025-09-26 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2025-09-26 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2025-09-26 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2025-09-26 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2025-09-26 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2025-09-26 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2025-09-26 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2025-09-26 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2025-09-26 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2025-09-26 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2025-09-26 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2025-09-26 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2025-09-26 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2025-09-26 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2025-09-26 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2025-09-26 | NEXPERA FORT HILL PLANT | NORTH BEND, Hamilton, OH | Pass | State |
| 2025-09-26 | GREYLOCK MIDSTREAM LLC/CUMBERLAND HENDERSON COMP STA | CARMICHAELS, Greene, PA | Pass | State |
| 2025-09-26 | CEMEX CONSTRUCTION MATERIALS ATLANTIC, LLC - KNOXVILLE CEMENT PLANT | KNOXVILLE, Knox, TN | Pass | Local |
| 2025-09-26 | EXXONMOBIL OIL CORP. (EMOC) | MEMPHIS, Shelby, TN | Pass | Local |
| 2025-09-26 | INTERMOUNTAIN POWER SERVICE CORPORATION | DELTA, Millard, UT | Pass | State |
| 2025-09-25 | KRONOSPAN USA — high-priority violation on file | EASTABOGA, Calhoun, AL | Pass | State |
| 2025-09-25 | WELLBORN CABINETS INC | ASHLAND, Clay, AL | Pass | State |
| 2025-09-25 | WELLBORN CABINETS INC | ASHLAND, Clay, AL | Pass | State |
| 2025-09-25 | GEORGIA-PACIFIC BREWTON LLC | BREWTON, Escambia, AL | Pass | State |
| 2025-09-25 | AMERICAN KRAFT PAPER INDUSTRIES, LLC. | WHITE HALL, Jefferson, AR | Pass | State |
| 2025-09-25 | RAZORBACK GATHERING COMPANY, LLC. - ROSE BUD COMPRESSOR STATION | SEARCY, White, AR | Pass | State |
| 2025-09-25 | RAZORBACK GATHERING COMPANY, LLC. - ROSE BUD COMPRESSOR STATION | SEARCY, White, AR | Pass | State |
| 2025-09-25 | EL PASO NATURAL GAS CO - SELIGMAN COMPRESSOR STATION | SELIGMAN, Yavapai, AZ | Pass | State |
| 2025-09-25 | PHILLIPS 66 CO/LA REFINERY WILMINGTON — high-priority violation on file | WILMINGTON, Los Angeles, CA | Pass | Local |
| 2025-09-25 | OC WASTE & RECYCLING, FRB | IRVINE, Orange, CA | Fail | Local |
| 2025-09-25 | CALPEAK POWER BORDER LLC | SAN DIEGO, San Diego, CA | Pending | Local |
| 2025-09-25 | E&B NATIONAL RESOURCES MANAGEMENT | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-25 | E&B NATIONAL RESOURCES MANAGEMENT | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-25 | E&B NATIONAL RESOURCES MANAGEMENT | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-25 | E&B NATIONAL RESOURCES MANAGEMENT | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-25 | E&B NATIONAL RESOURCES MANAGEMENT | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-25 | E&B NATIONAL RESOURCES MANAGEMENT | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-25 | HILMAR CHEESE COMPANY — high-priority violation on file | HILMAR, Merced, CA | Pass | Local |
| 2025-09-25 | HILMAR CHEESE COMPANY — high-priority violation on file | HILMAR, Merced, CA | Pass | Local |
| 2025-09-25 | HILMAR CHEESE COMPANY — high-priority violation on file | HILMAR, Merced, CA | Pass | Local |
| 2025-09-25 | HILMAR CHEESE COMPANY — high-priority violation on file | HILMAR, Merced, CA | Pass | Local |
| 2025-09-25 | ROCKY MOUNTAIN MIDSTREAM - WATKINS C.S. | BENNETT AREA, Adams, CO | Pass | State |
| 2025-09-25 | ROCKY MOUNTAIN MIDSTREAM - WATKINS C.S. | BENNETT AREA, Adams, CO | Pass | State |
| 2025-09-25 | LEPRINO FOODS COMPANY - GREELEY PLANT | GREELEY, Weld, CO | N/A | State |
| 2025-09-25 | PRAIRIE OPERATING CO - HESTER FARMS II | SEVERANCE AREA, Weld, CO | Pass | State |
| 2025-09-25 | NAUGATUCK WPCA/POTW | NAUGATUCK (HISTORICAL), New Haven, CT | Pass | State |
| 2025-09-25 | FIRST STATE GENERATION, LLC | WILMINGTON, New Castle, DE | Pass | State |
| 2025-09-25 | OMI, INC./CITY OF WILMINGTON (REBF) | WILMINGTON, New Castle, DE | Pass | State |
| 2025-09-25 | OMI, INC./CITY OF WILMINGTON (REBF) | WILMINGTON, New Castle, DE | Pass | State |
| 2025-09-25 | OMI, INC./CITY OF WILMINGTON (REBF) | WILMINGTON, New Castle, DE | Pass | State |
| 2025-09-25 | OMI, INC./CITY OF WILMINGTON (REBF) | WILMINGTON, New Castle, DE | Pass | State |
| 2025-09-25 | INTERNATIONAL PAPER COMPANY - PORT WENTWORTH MILL | PORT WENTWORTH, Chatham, GA | Pass | State |
| 2025-09-25 | INTERNATIONAL PAPER COMPANY - PORT WENTWORTH MILL | PORT WENTWORTH, Chatham, GA | Pass | State |
| 2025-09-25 | INTERNATIONAL PAPER COMPANY - PORT WENTWORTH MILL | PORT WENTWORTH, Chatham, GA | Pass | State |
| 2025-09-25 | INTERNATIONAL PAPER COMPANY - PORT WENTWORTH MILL | PORT WENTWORTH, Chatham, GA | Pass | State |
| 2025-09-25 | INTERNATIONAL PAPER COMPANY - PORT WENTWORTH MILL | PORT WENTWORTH, Chatham, GA | Pass | State |
| 2025-09-25 | LJR FOREST PRODUCTS | SWAINSBORO, Emanuel, GA | Pass | State |
| 2025-09-25 | LJR FOREST PRODUCTS | SWAINSBORO, Emanuel, GA | Pass | State |
| 2025-09-25 | HPOWER | KAPOLEI, Honolulu, HI | Pass | State |
| 2025-09-25 | HK CONTRACTORS INC 00079 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2025-09-25 | HK CONTRACTORS INC 00121 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2025-09-25 | HK CONTRACTORS INC 00168 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2025-09-25 | INLAND ASPHALT CO 00303 | BOISE, Ada, ID | Pass | State |
| 2025-09-25 | HK CONTRACTORS 00413 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2025-09-25 | HK CONTRACTORS INC 00463 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2025-09-25 | HK CONTRACTORS INC 00480 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2025-09-25 | HK CONTRACTORS 00495 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2025-09-25 | CLINTON COUNTY LANDFILL WALNUT CREEK LANDFILL | FRANKFORT, Clinton, IN | Pass | State |
| 2025-09-25 | STEEL DYNAMICS, INC. FLAT ROLL GROUP, BUTLER DIVISION — high-priority violation on file | BUTLER, DeKalb, IN | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.