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 |
|---|---|---|---|---|
| 2025-03-20 | CALIFORNIA DAIRIES, INC | TIPTON, Tulare, CA | Pass | Local |
| 2025-03-20 | CALIFORNIA DAIRIES, INC | TIPTON, Tulare, CA | Pass | Local |
| 2025-03-20 | CALIFORNIA DAIRIES, INC | TIPTON, Tulare, CA | Pass | Local |
| 2025-03-20 | CALIFORNIA DAIRIES, INC | TIPTON, Tulare, CA | Pass | Local |
| 2025-03-20 | CALIFORNIA DAIRIES, INC | TIPTON, Tulare, CA | Pass | Local |
| 2025-03-20 | CALIFORNIA DAIRIES, INC | TIPTON, Tulare, CA | Pass | Local |
| 2025-03-19 | SEARLES VALLEY MINERALS (IMC CHEMICALS) — high-priority violation on file | TRONA, San Bernardino, CA | Fail | Local |
| 2025-03-19 | SEARLES VALLEY MINERALS (IMC CHEMICALS) — high-priority violation on file | TRONA, San Bernardino, CA | Fail | Local |
| 2025-03-19 | COSUMNES POWER PLANT / SMUD | HERALD, Sacramento, CA | Pass | Local |
| 2025-03-19 | TESORO REFINING AND MARKETING CO — high-priority violation on file | WILMINGTON, Los Angeles, CA | Pass | Local |
| 2025-03-19 | SENTINEL ENERGY CENTER LLC | NORTH PALM SPRINGS, Riverside, CA | Pass | Local |
| 2025-03-19 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-03-19 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-03-19 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-03-19 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-03-19 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-03-18 | AERA ENERGY LLC | SAN ARDO, Monterey, CA | Pass | Local |
| 2025-03-18 | AERA ENERGY LLC | SAN ARDO, Monterey, CA | Pass | Local |
| 2025-03-18 | SAN DIEGO GAS & ELECTRIC | MORENO VALLEY, Riverside, CA | Fail | Local |
| 2025-03-18 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-03-18 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-03-18 | BUILDING MATERIALS MFG. CORP | SHAFTER, Kern, CA | Pass | Local |
| 2025-03-18 | BUILDING MATERIALS MFG. CORP | SHAFTER, Kern, CA | Pass | Local |
| 2025-03-18 | BUILDING MATERIALS MFG. CORP | SHAFTER, Kern, CA | Pass | Local |
| 2025-03-18 | BUILDING MATERIALS MFG. CORP | SHAFTER, Kern, CA | Pass | Local |
| 2025-03-18 | BUILDING MATERIALS MFG. CORP | SHAFTER, Kern, CA | Pass | Local |
| 2025-03-18 | BUILDING MATERIALS MFG. CORP | SHAFTER, Kern, CA | Pass | Local |
| 2025-03-18 | BUILDING MATERIALS MFG. CORP | SHAFTER, Kern, CA | Pass | Local |
| 2025-03-18 | BUILDING MATERIALS MFG. CORP | SHAFTER, Kern, CA | Pass | Local |
| 2025-03-18 | BUILDING MATERIALS MFG. CORP | SHAFTER, Kern, CA | Pass | Local |
| 2025-03-18 | LAND O' LAKES, INC — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-03-18 | LAND O' LAKES, INC — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-03-18 | LAND O' LAKES, INC — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-03-18 | LAND O' LAKES, INC — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-03-18 | LAND O' LAKES, INC — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-03-18 | LAND O' LAKES, INC — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-03-18 | LAND O' LAKES, INC — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-03-18 | LAND O' LAKES, INC — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-03-18 | LAND O' LAKES, INC — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-03-18 | LAND O' LAKES, INC — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-03-18 | CALIFORNIA DAIRIES, INC | TIPTON, Tulare, CA | Pass | Local |
| 2025-03-18 | CALIFORNIA DAIRIES, INC | TIPTON, Tulare, CA | Pass | Local |
| 2025-03-18 | CALIFORNIA DAIRIES, INC | TIPTON, Tulare, CA | Pass | Local |
| 2025-03-18 | CALIFORNIA DAIRIES, INC | TIPTON, Tulare, CA | Pass | Local |
| 2025-03-18 | CALIFORNIA DAIRIES, INC | TIPTON, Tulare, CA | Pass | Local |
| 2025-03-18 | CALIFORNIA DAIRIES, INC | TIPTON, Tulare, CA | Pass | Local |
| 2025-03-18 | CALIFORNIA DAIRIES, INC | TIPTON, Tulare, CA | Pass | Local |
| 2025-03-18 | CALIFORNIA DAIRIES, INC | TIPTON, Tulare, CA | Pass | Local |
| 2025-03-18 | CALIFORNIA DAIRIES, INC | TIPTON, Tulare, CA | Pass | Local |
| 2025-03-18 | CALIFORNIA DAIRIES, INC | TIPTON, Tulare, CA | Pass | Local |
| 2025-03-18 | CALIFORNIA DAIRIES, INC | TIPTON, Tulare, CA | Pass | Local |
| 2025-03-18 | CALIFORNIA DAIRIES, INC | TIPTON, Tulare, CA | Pass | Local |
| 2025-03-18 | CALIFORNIA DAIRIES, INC | TIPTON, Tulare, CA | Pass | Local |
| 2025-03-18 | CALIFORNIA DAIRIES, INC | TIPTON, Tulare, CA | Pass | Local |
| 2025-03-17 | USMC - AGCC 29 PALMS | TWENTYNINE PALMS, San Bernardino, CA | Pass | Local |
| 2025-03-17 | USMC - AGCC 29 PALMS | TWENTYNINE PALMS, San Bernardino, CA | Pass | Local |
| 2025-03-14 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-03-14 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-03-14 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-03-14 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-03-14 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-03-14 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-03-14 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-03-14 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-03-14 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-03-14 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-03-14 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-03-14 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-03-14 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-03-14 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-03-14 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-03-14 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-03-14 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-03-14 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-03-14 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-03-14 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-03-13 | SO CAL GAS - NEWBERRY SPRINGS | NEWBERRY SPRINGS, San Bernardino, CA | Pass | Local |
| 2025-03-13 | PG&E- HINKLEY | HINKLEY, San Bernardino, CA | Pass | Local |
| 2025-03-13 | PG&E- HINKLEY | HINKLEY, San Bernardino, CA | Pending | Local |
| 2025-03-13 | PG&E- HINKLEY | HINKLEY, San Bernardino, CA | Pass | Local |
| 2025-03-13 | PG&E- HINKLEY | HINKLEY, San Bernardino, CA | Pass | Local |
| 2025-03-13 | PG&E- HINKLEY | HINKLEY, San Bernardino, CA | Pass | Local |
| 2025-03-13 | PG&E- HINKLEY | HINKLEY, San Bernardino, CA | Pass | Local |
| 2025-03-13 | PG&E- HINKLEY | HINKLEY, San Bernardino, CA | Pass | Local |
| 2025-03-13 | 3M COMPANY | CORONA, Riverside, CA | Pass | Local |
| 2025-03-13 | 3M COMPANY | CORONA, Riverside, CA | Pass | Local |
| 2025-03-13 | 3M COMPANY | CORONA, Riverside, CA | Pass | Local |
| 2025-03-13 | 3M COMPANY | CORONA, Riverside, CA | Pass | Local |
| 2025-03-13 | SDG&E CUYAMACA PEAK ENERGY PLANT | EL CAJON, San Diego, CA | Fail | Local |
| 2025-03-12 | FRITO-LAY NORTH AMERICA, INC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-03-12 | FRITO-LAY NORTH AMERICA, INC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-03-12 | FRITO-LAY NORTH AMERICA, INC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-03-12 | FRITO-LAY NORTH AMERICA, INC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-03-12 | FRITO-LAY NORTH AMERICA, INC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-03-12 | FRITO-LAY NORTH AMERICA, INC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-03-12 | FRITO-LAY NORTH AMERICA, INC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-03-11 | SANTA FE PACIFIC PIPELINES LP | SACRAMENTO, Sacramento, CA | Pass | Local |
| 2025-03-11 | 3M COMPANY | CORONA, Riverside, CA | Pass | Local |
| 2025-03-11 | 3M COMPANY | CORONA, Riverside, CA | Pass | Local |
| 2025-03-11 | AERA ENERGY LLC — 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.