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.
What this page shows
This page covers Clean Air Act facilities in the EPA air register with stack tests in Maricopa county, AZ, in 2026. It lists 31 stack tests recorded in 2026.