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 |
|---|---|---|---|---|
| 2026-06-09 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-09 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-09 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-09 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-09 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-09 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-09 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-09 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-08 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-08 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-08 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-08 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-03 | FINK ROAD LANDFILL — high-priority violation on file | CROWS LANDING, Stanislaus, CA | Pass | Local |
| 2026-06-03 | FINK ROAD LANDFILL — high-priority violation on file | CROWS LANDING, Stanislaus, CA | Pass | Local |
| 2026-06-03 | FINK ROAD LANDFILL — high-priority violation on file | CROWS LANDING, Stanislaus, CA | Pass | Local |
| 2026-06-03 | FINK ROAD LANDFILL — high-priority violation on file | CROWS LANDING, Stanislaus, CA | Pass | Local |
| 2026-06-03 | FINK ROAD LANDFILL — high-priority violation on file | CROWS LANDING, Stanislaus, CA | Pass | Local |
| 2026-06-03 | FINK ROAD LANDFILL — high-priority violation on file | CROWS LANDING, Stanislaus, CA | Pass | Local |
| 2026-06-03 | FINK ROAD LANDFILL — high-priority violation on file | CROWS LANDING, Stanislaus, CA | Pass | Local |
| 2026-06-03 | FINK ROAD LANDFILL — high-priority violation on file | CROWS LANDING, Stanislaus, CA | Pass | Local |
| 2026-05-28 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | CARSON, Los Angeles, CA | Pass | Local |
| 2026-05-28 | CALIFORNIA RESOURCES PRODUCTION CORP | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-05-28 | CALIFORNIA RESOURCES PRODUCTION CORP | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-05-28 | U S INTEC, INC | STOCKTON, San Joaquin, CA | Pass | Local |
| 2026-05-28 | U S INTEC, INC | STOCKTON, San Joaquin, CA | Pass | Local |
| 2026-05-28 | U S INTEC, INC | STOCKTON, San Joaquin, CA | Pass | Local |
| 2026-05-28 | U S INTEC, INC | STOCKTON, San Joaquin, CA | Pass | Local |
| 2026-05-28 | U S INTEC, INC | STOCKTON, San Joaquin, CA | Pass | Local |
| 2026-05-28 | U S INTEC, INC | STOCKTON, San Joaquin, CA | Pass | Local |
| 2026-05-28 | PROCTER & GAMBLE PAPER PRODUCTS — high-priority violation on file | OXNARD, Ventura, CA | Pass | Local |
| 2026-05-26 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | CARSON, Los Angeles, CA | Pass | Local |
| 2026-05-26 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | CARSON, Los Angeles, CA | Pass | Local |
| 2026-05-26 | CA DEPT CORRECTIONS STATE PRISON-AVENAL | AVENAL, Kings, CA | Pass | Local |
| 2026-05-26 | CA DEPT CORRECTIONS STATE PRISON-AVENAL | AVENAL, Kings, CA | Pass | Local |
| 2026-05-26 | CA DEPT CORRECTIONS STATE PRISON-AVENAL | AVENAL, Kings, CA | Pass | Local |
| 2026-05-26 | CA DEPT CORRECTIONS STATE PRISON-AVENAL | AVENAL, Kings, CA | Pass | Local |
| 2026-05-26 | CA DEPT CORRECTIONS STATE PRISON-AVENAL | AVENAL, Kings, CA | Pass | Local |
| 2026-05-26 | CA DEPT CORRECTIONS STATE PRISON-AVENAL | AVENAL, Kings, CA | Pass | Local |
| 2026-05-26 | CA DEPT CORRECTIONS STATE PRISON-AVENAL | AVENAL, Kings, CA | Pass | Local |
| 2026-05-26 | CA DEPT CORRECTIONS STATE PRISON-AVENAL | AVENAL, Kings, CA | Pass | Local |
| 2026-05-26 | CA DEPT CORRECTIONS STATE PRISON-AVENAL | AVENAL, Kings, CA | Pass | Local |
| 2026-05-26 | CA DEPT CORRECTIONS STATE PRISON-AVENAL | AVENAL, Kings, CA | Pass | Local |
| 2026-05-21 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | CARSON, Los Angeles, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-21 | ALTAGAS SAN JOAQUIN ENERGY INC | LEMOORE, Kings, CA | Pass | Local |
| 2026-05-20 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | CARSON, Los Angeles, CA | Pass | Local |
| 2026-05-20 | LA CO. SANITATION DIST | CARSON, Los Angeles, CA | Pass | Local |
| 2026-05-19 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | CARSON, Los Angeles, CA | Pass | Local |
| 2026-05-19 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-05-19 | ARCOSA LIGHTWEIGHT, FRAZIER PARK (1603) — high-priority violation on file | FRAZIER PARK, Ventura, CA | Pass | Local |
| 2026-05-18 | INTERNATIONAL PAPER COMPANY | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-05-18 | INTERNATIONAL PAPER COMPANY | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-05-15 | RECONSERVE OF CALIFORNIA - STOCKTON INC | STOCKTON, San Joaquin, CA | Pass | Local |
| 2026-05-14 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-05-13 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | CARSON, Los Angeles, CA | Pass | Local |
| 2026-05-13 | E&B NATIONAL RESOURCES MANAGEMENT | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-05-13 | E&B NATIONAL RESOURCES MANAGEMENT | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-05-13 | E&B NATIONAL RESOURCES MANAGEMENT | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-05-13 | E&B NATIONAL RESOURCES MANAGEMENT | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-05-13 | E&B NATIONAL RESOURCES MANAGEMENT | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-05-13 | E&B NATIONAL RESOURCES MANAGEMENT | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-05-13 | E&B NATIONAL RESOURCES MANAGEMENT | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-05-13 | E&B NATIONAL RESOURCES MANAGEMENT | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-05-13 | E&B NATIONAL RESOURCES MANAGEMENT | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-05-13 | E&B NATIONAL RESOURCES MANAGEMENT | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-05-13 | E&B NATIONAL RESOURCES MANAGEMENT | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-05-13 | E&B NATIONAL RESOURCES MANAGEMENT | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-05-13 | COTTAGE BAKERY, INC. | LODI, San Joaquin, CA | Pass | Local |
| 2026-05-13 | COTTAGE BAKERY, INC. | LODI, San Joaquin, CA | Pass | Local |
| 2026-05-13 | COTTAGE BAKERY, INC. | LODI, San Joaquin, CA | Pass | Local |
| 2026-05-13 | COTTAGE BAKERY, INC. | LODI, San Joaquin, CA | Pass | Local |
| 2026-05-13 | SOUTHERN CALIFORNIA GAS CO | VENTURA, Ventura, CA | Pass | Local |
| 2026-05-12 | MONTEREY REGIONAL WASTE MGMT DIST | MARINA, Monterey, CA | Pass | Local |
| 2026-05-12 | MONTEREY REGIONAL WASTE MGMT DIST | MARINA, Monterey, CA | Pass | Local |
| 2026-05-12 | MONTEREY REGIONAL WASTE MGMT DIST | MARINA, Monterey, CA | Pass | Local |
| 2026-05-12 | SANTA CRUZ COUNTY PUBLIC WORKS-BUENA VISTA | WATSONVILLE, Santa Cruz, CA | Pass | Local |
| 2026-05-12 | SANTA CRUZ COUNTY PUBLIC WORKS-BUENA VISTA | WATSONVILLE, Santa Cruz, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.