EPA Air · stack tests by state and year
Air-emissions stack tests in California, 2026
- 979Stack 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 California during 2026; one facility can appear more than once, because this is a record of what happened rather than a list of places.
Counties in California, 2026
- Kern County 320
- Stanislaus County 246
- San Joaquin County 187
- Kings County 54
- Los Angeles County 39
- Merced County 32
- Madera County 20
- San Bernardino County 19
- Monterey County 19
- Tulare County 14
- Ventura County 13
- Sacramento County 5
- Orange County 4
- Riverside County 4
California, other years
Air-emissions stack tests recorded in California, 2026
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2026-01-28 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-28 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-28 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-28 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-28 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-28 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-28 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-28 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-28 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-28 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-28 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-28 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-28 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-28 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-28 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-28 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-28 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | MONTEREY REGIONAL WASTE MGMT DIST | MARINA, Monterey, CA | Pass | Local |
| 2026-01-27 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | CARSON, Los Angeles, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.