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 |
|---|---|---|---|---|
| 2025-02-10 | HIGH SIERRA LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-02-10 | HIGH SIERRA LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-02-07 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-02-07 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-02-07 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-02-07 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-02-07 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-02-07 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-02-06 | SHADOW WOLF ENERGY, LLC | SANTA CLARITA, Los Angeles, CA | Pass | Local |
| 2025-02-06 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-02-06 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-02-06 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-02-06 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-02-06 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-02-06 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-02-06 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-02-06 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-02-06 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-02-06 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-02-06 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-02-06 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-02-06 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-02-06 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-02-06 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-02-06 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-02-06 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-02-06 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-02-06 | DELANO ENERGY CENTER LLC | SHAFTER, Kern, CA | Pass | Local |
| 2025-02-06 | DELANO ENERGY CENTER LLC | SHAFTER, Kern, CA | Pass | Local |
| 2025-02-06 | DELANO ENERGY CENTER LLC | SHAFTER, Kern, CA | Pass | Local |
| 2025-02-06 | DELANO ENERGY CENTER LLC | SHAFTER, Kern, CA | Pass | Local |
| 2025-02-06 | DELANO ENERGY CENTER LLC | SHAFTER, Kern, CA | Pass | Local |
| 2025-02-06 | DELANO ENERGY CENTER LLC | SHAFTER, Kern, CA | Pass | Local |
| 2025-02-06 | DELANO ENERGY CENTER LLC | SHAFTER, Kern, CA | Pass | Local |
| 2025-02-06 | DELANO ENERGY CENTER LLC | SHAFTER, Kern, CA | Pass | Local |
| 2025-02-06 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-02-06 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-02-06 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-02-06 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-02-06 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-02-06 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-02-06 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-02-06 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-02-06 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-02-06 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-02-06 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-02-06 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-02-05 | BURBANK CITY, BURBANK WATER & POWER | BURBANK, Los Angeles, CA | Pass | Local |
| 2025-02-05 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-02-05 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-02-05 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-02-05 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-02-05 | LAND O' LAKES, INC — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-02-05 | LAND O' LAKES, INC — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-02-05 | LAND O' LAKES, INC — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-02-05 | LAND O' LAKES, INC — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-02-05 | LAND O' LAKES, INC — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-02-05 | LAND O' LAKES, INC — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-02-05 | LAND O' LAKES, INC — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-02-05 | LAND O' LAKES, INC — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-02-05 | LAND O' LAKES, INC — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-02-05 | LAND O' LAKES, INC — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-02-04 | CHEVRON POWER HOLDINGS, INC. FOR SALINAS RIVER COGENERATION FACILITY | SAN ARDO, Monterey, CA | Pass | Local |
| 2025-02-04 | NAFTEX OPERATING CO-PORTALS PETRO LEASE — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-02-04 | NAFTEX OPERATING CO-PORTALS PETRO LEASE — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-02-04 | FOSTER FOOD PRODUCTS — high-priority violation on file | LIVINGSTON, Merced, CA | Pass | Local |
| 2025-02-03 | WASTE SOLUTION GROUP OF SAN BENITO, LLC | HOLLISTER, San Benito, CA | Pass | Local |
| 2025-02-03 | QUEMETCO INC | CITY OF INDUSTRY, Los Angeles, CA | Pass | Local |
| 2025-02-03 | BETA OFFSHORE | HUNTINGTON BEACH, Orange, CA | Pass | Local |
| 2025-02-03 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-02-03 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-02-03 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-02-03 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-01-31 | SOUTHERN CALIFORNIA EDISON | REDLANDS, San Bernardino, CA | Pass | Local |
| 2025-01-31 | SOUTHERN CALIFORNIA EDISON | REDLANDS, San Bernardino, CA | Pass | Local |
| 2025-01-31 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-01-31 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-01-31 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-01-31 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-01-31 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-01-31 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-01-31 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-01-31 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-01-31 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-01-31 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-01-31 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-01-31 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-01-31 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-01-31 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-01-31 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-01-31 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-01-31 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-01-31 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-01-31 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-01-31 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-01-31 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-01-31 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-01-31 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-01-31 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-01-30 | QUEMETCO INC | CITY OF INDUSTRY, Los Angeles, CA | Pass | Local |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.