EPA Air · stack tests by county and year
Air-emissions stack tests in Maricopa County, Arizona, 2026
- 31Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit. Each row below is one stack test recorded against a source in Maricopa County, Arizona during 2026. A facility can appear several times: this is the year’s record of what happened, not a list of places. The sources themselves are on the Maricopa County facility page.
Maricopa County, Arizona, 2026
Air-emissions stack tests in Maricopa County, other years
Air-emissions stack tests recorded in Maricopa County, Arizona, 2026
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2026-08-19 | HENRY PRODUCTS — high-priority violation on file | Pending | Local |
| 2026-08-13 | APS REDHAWK GENERATING FACILITY | Pending | Local |
| 2026-08-13 | ARLINGTON VALLEY — high-priority violation on file | Pending | Local |
| 2026-08-07 | APS WEST PHX POWER PLANT | Pending | Local |
| 2026-07-21 | MESQUITE GENERATING STATION | Pass | Local |
| 2026-07-15 | APS WEST PHX POWER PLANT | Pending | Local |
| 2026-07-14 | CMC STEEL FABRICATORS | Pending | Local |
| 2026-07-09 | INTEL CORP - OCOTILLO CAMPUS — high-priority violation on file | Pending | Local |
| 2026-07-07 | GILA RIVER POWER STATION — high-priority violation on file | Pending | Local |
| 2026-06-30 | INTEL CORP - OCOTILLO CAMPUS — high-priority violation on file | Pending | Local |
| 2026-05-27 | QUIKJET - MONROE I & II TERMINALS — high-priority violation on file | Pending | Local |
| 2026-05-27 | SALT RIVER PROJECT - KYRENE GENERATING STATION — high-priority violation on file | Pending | Local |
| 2026-05-16 | SALT RIVER PROJECT - SANTAN GENERATING STATION | Pending | Local |
| 2026-05-14 | APS OCOTILLO POWER PLANT | Pending | Local |
| 2026-05-08 | MESQUITE GENERATING STATION | Pass | Local |
| 2026-05-07 | TSMC PHOENIX PROJECT | Pending | Local |
| 2026-05-06 | NEW HARQUAHALA GENERATING | Pending | Local |
| 2026-04-27 | TSMC PHOENIX PROJECT | Pass | Local |
| 2026-04-25 | SALT RIVER PROJECT - AGUA FRIA GENERATING STATION | Pass | Local |
| 2026-04-22 | TSMC PHOENIX PROJECT | Pass | Local |
| 2026-04-21 | CMC STEEL FABRICATORS | Pass | Local |
| 2026-04-16 | BALL METAL BEVERAGE CONTAINER CORPORATION — high-priority violation on file | Pass | Local |
| 2026-04-16 | BALL METAL BEVERAGE CONTAINER CORPORATION — high-priority violation on file | Pending | Local |
| 2026-04-02 | SALT RIVER PROJECT - SANTAN GENERATING STATION | Pass | Local |
| 2026-04-01 | APS WEST PHX POWER PLANT | Pass | Local |
| 2026-02-06 | INTEL CORP - OCOTILLO CAMPUS — high-priority violation on file | Pass | Local |
| 2026-02-04 | CIRCLE K TERMINAL | Pass | Local |
| 2026-02-03 | SFPP-PHOENIX TERMINAL | Pass | Local |
| 2026-01-28 | VULCAN MATERIALS — high-priority violation on file | Pass | Local |
| 2026-01-22 | CMC STEEL FABRICATORS | Pass | Local |
| 2026-01-14 | ROGERS CORPORATION - ROOSEVELT AVE FACILITY — high-priority violation on file | Pass | Local |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.