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.