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 |
|---|---|---|---|---|
| 2026-04-08 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-04-08 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-04-08 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-04-08 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-04-08 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-04-07 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | CARSON, Los Angeles, CA | Pass | Local |
| 2026-04-02 | PLAINS MARKETING, LP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-04-02 | PLAINS MARKETING, LP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-04-02 | PLAINS MARKETING, LP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-04-02 | PLAINS MARKETING, LP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-04-02 | PLAINS MARKETING, LP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-04-02 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-04-02 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-04-02 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-04-02 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-04-02 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-04-02 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-04-02 | AERA ENERGY — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-04-02 | NEW-INDY OXNARD, LLC | OXNARD, Ventura, CA | Pass | Local |
| 2026-04-01 | IVANPAH I, II, III | IVANPAH, San Bernardino, CA | Pass | Local |
| 2026-04-01 | IVANPAH I, II, III | IVANPAH, San Bernardino, CA | Pass | Local |
| 2026-04-01 | IVANPAH I, II, III | IVANPAH, San Bernardino, CA | Pass | Local |
| 2026-03-31 | ALON BAKERSFIELD REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-03-31 | ALON BAKERSFIELD REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-03-31 | ALON BAKERSFIELD REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-03-31 | ALON BAKERSFIELD REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-03-31 | ALON BAKERSFIELD REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-03-31 | SAN JOAQUIN REFINING CO — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-03-31 | SAN JOAQUIN REFINING CO — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-03-31 | SAN JOAQUIN REFINING CO — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-03-31 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-03-31 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-03-31 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-03-31 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-03-31 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-03-31 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-03-31 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-03-31 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-03-31 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-03-31 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-03-31 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-03-31 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-03-30 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-03-30 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-03-27 | LA CO. SANITATION DIST | CARSON, Los Angeles, CA | Pass | Local |
| 2026-03-26 | CENTRAL VALLEY MEAT CO | HANFORD, Kings, CA | Pass | Local |
| 2026-03-26 | CENTRAL VALLEY MEAT CO | HANFORD, Kings, CA | Pass | Local |
| 2026-03-26 | CENTRAL VALLEY MEAT CO | HANFORD, Kings, CA | Pass | Local |
| 2026-03-26 | CENTRAL VALLEY MEAT CO | HANFORD, Kings, CA | Pass | Local |
| 2026-03-25 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-03-25 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-03-25 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-03-25 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-03-25 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-03-25 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-03-25 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-03-24 | SO CAL GAS - NO. NEEDLES | NEEDLES, San Bernardino, CA | Pass | Local |
| 2026-03-24 | SO CAL GAS - NO. NEEDLES | NEEDLES, San Bernardino, CA | Pass | Local |
| 2026-03-20 | TESORO REFINING AND MARKETING CO, LLC | CARSON, Los Angeles, CA | Pass | Local |
| 2026-03-19 | USMC - AGCC 29 PALMS | TWENTYNINE PALMS, San Bernardino, CA | Pass | Local |
| 2026-03-19 | USMC - AGCC 29 PALMS | TWENTYNINE PALMS, San Bernardino, CA | Pass | Local |
| 2026-03-19 | USMC - AGCC 29 PALMS | TWENTYNINE PALMS, San Bernardino, CA | Pass | Local |
| 2026-03-19 | GLASS HOUSE CAMARILLO CULTIVATION LLC | CAMARILLO, Ventura, CA | Pass | Local |
| 2026-03-18 | USMC - AGCC 29 PALMS | TWENTYNINE PALMS, San Bernardino, CA | Pass | Local |
| 2026-03-18 | USMC - AGCC 29 PALMS | TWENTYNINE PALMS, San Bernardino, CA | Pass | Local |
| 2026-03-18 | TESORO REFINING AND MARKETING CO — high-priority violation on file | WILMINGTON, Los Angeles, CA | Pass | Local |
| 2026-03-18 | LA CITY, SANITATION BUREAU (HTP) | PLAYA DEL REY, Los Angeles, CA | Pass | Local |
| 2026-03-17 | PROCTER & GAMBLE PAPER PRODUCTS — high-priority violation on file | OXNARD, Ventura, CA | Pass | Local |
| 2026-03-16 | TESORO REFINING AND MARKETING CO — high-priority violation on file | WILMINGTON, Los Angeles, CA | Pass | Local |
| 2026-03-16 | TESORO REFINING AND MARKETING CO, LLC | CARSON, Los Angeles, CA | Pass | Local |
| 2026-03-12 | COSUMNES POWER PLANT / SMUD | HERALD, Sacramento, CA | Pass | Local |
| 2026-03-11 | SANTA FE PACIFIC PIPELINES LP | SACRAMENTO, Sacramento, CA | Pending | Local |
| 2026-03-11 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-03-11 | GALLO GLASS CO — high-priority violation on file | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-03-11 | GALLO GLASS CO — high-priority violation on file | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-03-11 | GALLO GLASS CO — high-priority violation on file | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-03-11 | GALLO GLASS CO — high-priority violation on file | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.