EPA Air · stack tests by state and year
Air-emissions stack tests in California, 2025
- 5,390Stack 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 2025; one facility can appear more than once, because this is a record of what happened rather than a list of places.
Counties in California, 2025
- Kern County 3,380
- Stanislaus County 579
- San Joaquin County 413
- Fresno County 211
- Merced County 170
- Tulare County 157
- Los Angeles County 139
- Madera County 91
- San Bernardino County 74
- Monterey County 49
- Riverside County 29
- Kings County 23
- Sacramento County 17
- Ventura County 17
- San Diego County 11
- Orange County 10
- Santa Cruz County 7
- Undetermined County 6
- Humboldt County 6
California, other years
Air-emissions stack tests recorded in California, 2025
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2025-09-24 | MODESTO IRRIGATION DISTRICT | RIPON, San Joaquin, CA | Pass | Local |
| 2025-09-23 | CHEVRON USA | SACRAMENTO, Sacramento, CA | Pending | Local |
| 2025-09-23 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-23 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-23 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-23 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-23 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-23 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-23 | SENECA RESOURCES — high-priority violation on file | MCKITTRICK, Kern, CA | Pass | Local |
| 2025-09-23 | SENECA RESOURCES — high-priority violation on file | MCKITTRICK, Kern, CA | Pass | Local |
| 2025-09-23 | SENECA RESOURCES — high-priority violation on file | MCKITTRICK, Kern, CA | Pass | Local |
| 2025-09-23 | SENECA RESOURCES — high-priority violation on file | MCKITTRICK, Kern, CA | Pass | Local |
| 2025-09-23 | SENECA RESOURCES — high-priority violation on file | MCKITTRICK, Kern, CA | Pass | Local |
| 2025-09-23 | SENECA RESOURCES — high-priority violation on file | MCKITTRICK, Kern, CA | Pass | Local |
| 2025-09-23 | SENECA RESOURCES — high-priority violation on file | MCKITTRICK, Kern, CA | Pass | Local |
| 2025-09-23 | SENECA RESOURCES — high-priority violation on file | MCKITTRICK, Kern, CA | Pass | Local |
| 2025-09-23 | SENECA RESOURCES — high-priority violation on file | MCKITTRICK, Kern, CA | Pass | Local |
| 2025-09-23 | SENECA RESOURCES — high-priority violation on file | MCKITTRICK, Kern, CA | Pass | Local |
| 2025-09-23 | SENECA RESOURCES — high-priority violation on file | MCKITTRICK, Kern, CA | Pass | Local |
| 2025-09-23 | SENECA RESOURCES — high-priority violation on file | MCKITTRICK, Kern, CA | Pass | Local |
| 2025-09-23 | SENECA RESOURCES — high-priority violation on file | MCKITTRICK, Kern, CA | Pass | Local |
| 2025-09-23 | SENECA RESOURCES — high-priority violation on file | MCKITTRICK, Kern, CA | Pass | Local |
| 2025-09-23 | SENECA RESOURCES — high-priority violation on file | MCKITTRICK, Kern, CA | Pass | Local |
| 2025-09-23 | SENECA RESOURCES — high-priority violation on file | MCKITTRICK, Kern, CA | Pass | Local |
| 2025-09-23 | SENECA RESOURCES — high-priority violation on file | MCKITTRICK, Kern, CA | Pass | Local |
| 2025-09-23 | SENECA RESOURCES — high-priority violation on file | MCKITTRICK, Kern, CA | Pass | Local |
| 2025-09-23 | SENECA RESOURCES — high-priority violation on file | MCKITTRICK, Kern, CA | Pass | Local |
| 2025-09-23 | SENECA RESOURCES — high-priority violation on file | MCKITTRICK, Kern, CA | Pass | Local |
| 2025-09-23 | SENECA RESOURCES — high-priority violation on file | MCKITTRICK, Kern, CA | Pass | Local |
| 2025-09-22 | LADW&P-HAYNES STEAM | LONG BEACH, Los Angeles, CA | Pass | Local |
| 2025-09-22 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-22 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-22 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-22 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-22 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-22 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-19 | LADW&P-HAYNES STEAM | LONG BEACH, Los Angeles, CA | Pass | Local |
| 2025-09-19 | LA CITY, DWP HARBOR GENERATING STATION | WILMINGTON, Los Angeles, CA | Pass | Local |
| 2025-09-18 | EQUILON ENTER. LLC, SHELL OIL PROD. US | CARSON, Los Angeles, CA | Pass | Local |
| 2025-09-18 | CALIFORNIA DAIRIES, INC. | FRESNO, Fresno, CA | Pass | Local |
| 2025-09-18 | CALIFORNIA DAIRIES, INC. | FRESNO, Fresno, CA | Pass | Local |
| 2025-09-18 | CALIFORNIA DAIRIES, INC. | FRESNO, Fresno, CA | Pass | Local |
| 2025-09-18 | CALIFORNIA DAIRIES, INC. | FRESNO, Fresno, CA | Pass | Local |
| 2025-09-18 | CALIFORNIA DAIRIES, INC. | FRESNO, Fresno, CA | Pass | Local |
| 2025-09-18 | CALIFORNIA DAIRIES, INC. | FRESNO, Fresno, CA | Pass | Local |
| 2025-09-18 | CALIFORNIA DAIRIES, INC. | FRESNO, Fresno, CA | Pass | Local |
| 2025-09-18 | CALIFORNIA DAIRIES, INC. | FRESNO, Fresno, CA | Pass | Local |
| 2025-09-18 | CALIFORNIA DAIRIES, INC. | FRESNO, Fresno, CA | Pass | Local |
| 2025-09-18 | CALIFORNIA DAIRIES, INC. | FRESNO, Fresno, CA | Pass | Local |
| 2025-09-18 | CALIFORNIA DAIRIES, INC. | FRESNO, Fresno, CA | Pass | Local |
| 2025-09-18 | CALIFORNIA DAIRIES, INC. | FRESNO, Fresno, CA | Pass | Local |
| 2025-09-18 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-18 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-18 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-18 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-18 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-18 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-18 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-18 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-18 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-17 | PHILLIPS 66 CO/LA REFINERY WILMINGTON — high-priority violation on file | WILMINGTON, Los Angeles, CA | Pass | Local |
| 2025-09-17 | BUCKEYE TERMINALS LLC | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-09-17 | BUCKEYE TERMINALS LLC | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-09-17 | BUCKEYE TERMINALS LLC | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-09-17 | BUCKEYE TERMINALS LLC | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | LAND O' LAKES, INC — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-09-17 | LAND O' LAKES, INC — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-09-17 | LAND O' LAKES, INC — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-09-17 | LAND O' LAKES, INC — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-09-17 | LAND O' LAKES, INC — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-09-16 | LA CITY, DWP HARBOR GENERATING STATION | WILMINGTON, Los Angeles, CA | Pass | Local |
| 2025-09-16 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-16 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-16 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-16 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.