EPA Air · stack tests by state and year
Air-emissions stack tests in Arizona, 2025
- 116Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit. Every stack test below was recorded against a source in Arizona during 2025; one facility can appear more than once, because this is a record of what happened rather than a list of places.
Counties in Arizona, 2025
- Maricopa County 53
- Mohave County 9
- Yavapai County 8
- Greenlee County 8
- Cochise County 7
- Apache County 6
- Graham County 6
- Gila County 6
- La Paz County 3
- Pima County 3
- Navajo County 3
Arizona, other years
Air-emissions stack tests recorded in Arizona, 2025
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2025-12-18 | CALPORTLAND - RILLITO CEMENT PLANT | MARANA, Pima, AZ | Pass | State |
| 2025-12-17 | APACHE GENERATING STATION | COCHISE, Cochise, AZ | Pass | State |
| 2025-12-17 | PINTO VALLEY MINE | MIAMI, Gila, AZ | Pass | State |
| 2025-12-17 | FREEPORT-MCMORAN - MORENCI | MORENCI, Greenlee, AZ | Pass | State |
| 2025-12-17 | INTEL CORP - OCOTILLO CAMPUS — high-priority violation on file | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-12-12 | INTEL CORP - OCOTILLO CAMPUS — high-priority violation on file | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-12-12 | INTEL CORP - OCOTILLO CAMPUS — high-priority violation on file | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-12-10 | NATURESWEET USA, LLC - WILLCOX FACILITY | WILLCOX, Graham, AZ | Pass | State |
| 2025-12-10 | NUCOR STEEL KINGMAN | KINGMAN, Mohave, AZ | Pass | State |
| 2025-12-08 | INTEL CORP - OCOTILLO CAMPUS — high-priority violation on file | MARICOPA COUNTY, Maricopa, AZ | Fail | Local |
| 2025-12-05 | QTS GLENDALE I | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-12-04 | INTEL CORP - OCOTILLO CAMPUS — high-priority violation on file | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-11-24 | FREEPORT MCMORAN - MIAMI SMELTER | MIAMI, Gila, AZ | Pass | State |
| 2025-11-21 | FREEPORT-MCMORAN - MORENCI | MORENCI, Greenlee, AZ | Pass | State |
| 2025-11-14 | NORTHWEST REGIONAL LANDFILL | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-11-10 | ASARCO - HAYDEN SMELTER — high-priority violation on file | HAYDEN, Gila, AZ | Pass | State |
| 2025-11-10 | ASARCO - HAYDEN SMELTER — high-priority violation on file | HAYDEN, Gila, AZ | Pass | State |
| 2025-11-06 | TOPOCK LNG PLANT 1 COOLING WATER BLOWDOWN POND | TOPOCK, Mohave, AZ | Pass | State |
| 2025-10-31 | HENRY PRODUCTS — high-priority violation on file | MARICOPA COUNTY, Maricopa, AZ | Fail | Local |
| 2025-10-24 | CMC STEEL FABRICATORS | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-10-22 | FREEPORT MCMORAN - MIAMI SMELTER | MIAMI, Gila, AZ | Pass | State |
| 2025-10-22 | DRAKE CEMENT- DRAKE ROAD SITE — high-priority violation on file | PAULDEN, Yavapai, AZ | Pass | State |
| 2025-10-15 | REAL ALLOY ARIZONA | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-10-11 | SOLANA GENERATING STATION | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-10-07 | SUMCO SOUTHWEST CORPORATION — high-priority violation on file | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-10-06 | FREEPORT-MCMORAN - MORENCI | MORENCI, Greenlee, AZ | Fail | State |
| 2025-09-25 | EL PASO NATURAL GAS CO - SELIGMAN COMPRESSOR STATION | SELIGMAN, Yavapai, AZ | Pass | State |
| 2025-09-24 | EL PASO NATURAL GAS CO - WILLIAMS COMPRESSOR STATION | WILLIAMS, Coconino, AZ | Pass | State |
| 2025-09-23 | MECP1 MESA INTERMEDIATE 1 | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-09-23 | SALT RIVER PROJECT - KYRENE GENERATING STATION — high-priority violation on file | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-09-16 | APACHE GENERATING STATION | COCHISE, Cochise, AZ | Pass | State |
| 2025-09-12 | CORONADO GENERATING PLANT | SAINT JOHNS, Apache, AZ | Pass | State |
| 2025-09-10 | NOVO BIOPOWER, LLC | SNOWFLAKE, Navajo, AZ | Pass | State |
| 2025-09-04 | MOSS MINE | BULLHEAD CITY, Mohave, AZ | Pass | State |
| 2025-08-27 | APACHE GENERATING STATION | COCHISE, Cochise, AZ | Pass | State |
| 2025-08-21 | ARLINGTON VALLEY — high-priority violation on file | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-08-20 | PHOENIX CEMENT | CLARKDALE, Yavapai, AZ | Pass | State |
| 2025-08-14 | EHRENBERG COMPRESSOR STATION | EHRENBERG, La Paz, AZ | Pass | State |
| 2025-08-14 | DRAKE CEMENT- DRAKE ROAD SITE — high-priority violation on file | PAULDEN, Yavapai, AZ | Pass | State |
| 2025-08-14 | DRAKE CEMENT- DRAKE ROAD SITE — high-priority violation on file | PAULDEN, Yavapai, AZ | Pass | State |
| 2025-08-14 | APS REDHAWK GENERATING FACILITY | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-08-08 | APS WEST PHX POWER PLANT | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-08-01 | NEW WINCUP HOLDINGS — high-priority violation on file | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-07-30 | SOLANA GENERATING STATION | MARICOPA COUNTY, Maricopa, AZ | Incomplete | Local |
| 2025-07-28 | FREEPORT-MCMORAN - SAFFORD OPERATIONS | SAFFORD, Graham, AZ | Pass | State |
| 2025-07-18 | FREEPORT-MCMORAN - MORENCI | MORENCI, Greenlee, AZ | Pass | State |
| 2025-07-16 | APS WEST PHX POWER PLANT | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-07-15 | INTEL CORP - OCOTILLO CAMPUS — high-priority violation on file | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-07-08 | CMC STEEL FABRICATORS | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-07-01 | SOLANA GENERATING STATION | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-06-29 | SALT RIVER PROJECT - KYRENE GENERATING STATION — high-priority violation on file | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-06-27 | TUCSON ELECTRIC POWER - SPRINGERVILLE GENERATING STATION | SPRINGERVILLE, Apache, AZ | Pass | State |
| 2025-06-26 | FREEPORT-MCMORAN - MORENCI | MORENCI, Greenlee, AZ | Fail | State |
| 2025-06-26 | NEW HARQUAHALA GENERATING | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-06-25 | UNS ELECTRIC INC - BLACK MOUNTAIN GENERATING STATION | GRIFFITH, Mohave, AZ | Pass | State |
| 2025-06-25 | APS - YUCCA POWER PLANT | YUMA, Yuma, AZ | Pass | State |
| 2025-06-25 | SALT RIVER PROJECT - SANTAN GENERATING STATION | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-06-20 | CALPORTLAND - RILLITO CEMENT PLANT | MARANA, Pima, AZ | Pass | State |
| 2025-06-18 | HYDRO EXTRUSION USA | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-06-17 | GRIFFITH POWER PLANT | GRIFFITH, Mohave, AZ | Pass | State |
| 2025-06-16 | TUCSON ELECTRIC POWER - SPRINGERVILLE GENERATING STATION | SPRINGERVILLE, Apache, AZ | Pass | State |
| 2025-06-12 | QUIKJET - MONROE I & II TERMINALS — high-priority violation on file | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-06-11 | TUCSON ELECTRIC POWER - SPRINGERVILLE GENERATING STATION | SPRINGERVILLE, Apache, AZ | Pass | State |
| 2025-06-11 | FREEPORT-MCMORAN - MORENCI | MORENCI, Greenlee, AZ | Pass | State |
| 2025-06-10 | QUIKJET - MONROE I & II TERMINALS — high-priority violation on file | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-06-07 | TUCSON ELECTRIC POWER - SPRINGERVILLE GENERATING STATION | SPRINGERVILLE, Apache, AZ | Pass | State |
| 2025-06-06 | SALT RIVER PROJECT - AGUA FRIA GENERATING STATION | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-06-04 | NOVO BIOPOWER, LLC | SNOWFLAKE, Navajo, AZ | Pass | State |
| 2025-06-03 | APACHE GENERATING STATION | COCHISE, Cochise, AZ | Pass | State |
| 2025-06-03 | CALJET | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-06-03 | QUIKJET - MONROE I & II TERMINALS — high-priority violation on file | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-05-22 | PHOENIX CEMENT | CLARKDALE, Yavapai, AZ | Pass | State |
| 2025-05-22 | GILA RIVER POWER STATION — high-priority violation on file | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-05-21 | DRAKE CEMENT- DRAKE ROAD SITE — high-priority violation on file | PAULDEN, Yavapai, AZ | Pass | State |
| 2025-05-16 | APS OCOTILLO POWER PLANT | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-05-13 | PHOENIX FACILITY | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-05-09 | MESQUITE GENERATING STATION | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-05-01 | VALENCIA POWER PLANT | NOGALES, Santa Cruz, AZ | Pass | State |
| 2025-04-24 | FREEPORT-MCMORAN - MORENCI | MORENCI, Greenlee, AZ | Pass | State |
| 2025-04-23 | FREEPORT MCMORAN - MIAMI SMELTER | MIAMI, Gila, AZ | Pass | State |
| 2025-04-16 | MICROSOFT CORP - BROADWAY RD | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-04-15 | INTEL CORP - OCOTILLO CAMPUS — high-priority violation on file | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-04-11 | CMC STEEL FABRICATORS | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-04-10 | LINDE GAS & EQUIPMENT, INC. | KINGMAN, Mohave, AZ | Pass | State |
| 2025-04-10 | INTEL CORP CHANDLER CAMPUS (FAB 6) | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-04-03 | FREEPORT-MCMORAN - MORENCI | MORENCI, Greenlee, AZ | Pass | State |
| 2025-03-26 | APACHE GENERATING STATION | COCHISE, Cochise, AZ | Pass | State |
| 2025-03-25 | TRANSWESTERN PIPELINE - KINGMAN COMPRESSOR STATION | FORT ROCK ROAD, Mohave, AZ | Pass | State |
| 2025-03-21 | APACHE NITROGEN PRODUCTS INC — high-priority violation on file | SAINT DAVID, Cochise, AZ | Pass | State |
| 2025-03-20 | FREEPORT-MCMORAN - SAFFORD OPERATIONS | SAFFORD, Graham, AZ | Pass | State |
| 2025-03-20 | FREEPORT-MCMORAN - SAFFORD OPERATIONS | SAFFORD, Graham, AZ | Pass | State |
| 2025-03-13 | EL PASO NATURAL GAS CO - WENDEN COMPRESSOR STATION | CENTENNIAL, La Paz, AZ | Pass | State |
| 2025-03-12 | EL PASO NATURAL GAS CO - ALAMO LAKE COMPRESSOR STATION | ALAMO CROSSING (HISTORICAL), La Paz, AZ | Pass | State |
| 2025-03-11 | EL PASO NATURAL GAS CO - DUTCH FLAT COMPRESSOR STATION | FRANCONIA, Mohave, AZ | Pass | State |
| 2025-03-05 | NATURESWEET USA, LLC - WILLCOX FACILITY | WILLCOX, Graham, AZ | Pass | State |
| 2025-03-05 | EL PASO NATURAL GAS CO - MOJAVE TOPOCK COMPRESSOR STATION | TOPOCK, Mohave, AZ | Pass | State |
| 2025-03-04 | CORONADO GENERATING PLANT | SAINT JOHNS, Apache, AZ | Pass | State |
| 2025-02-24 | INTEL CORP - OCOTILLO CAMPUS — high-priority violation on file | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-02-04 | SFPP-PHOENIX TERMINAL | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-01-31 | CIRCLE K TERMINAL | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
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Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.
What this page shows
This page covers Clean Air Act facilities in the EPA air register with stack tests in AZ for 2025. It lists 116 stack tests recorded in 2025.