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 |
|---|---|---|---|---|
| 2026-08-25 | SAN JOAQUIN REFINING CO — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-25 | SAN JOAQUIN REFINING CO — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-25 | SAN JOAQUIN REFINING CO — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-05 | SACRAMENTO MUNICIPAL UTILITY DIST. FINANCING AUTHORITY DBA CAMPBELL POWER PLANT | SACRAMENTO, Sacramento, CA | Pending | Local |
| 2026-07-29 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-29 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-29 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-29 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-28 | AERA ENERGY LLC | VENTURA, Ventura, CA | Pass | Local |
| 2026-07-23 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-23 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-23 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-23 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-23 | HILMAR CHEESE COMPANY — high-priority violation on file | HILMAR, Merced, CA | Pass | Local |
| 2026-07-23 | HILMAR CHEESE COMPANY — high-priority violation on file | HILMAR, Merced, CA | Pass | Local |
| 2026-07-23 | HILMAR CHEESE COMPANY — high-priority violation on file | HILMAR, Merced, CA | Pass | Local |
| 2026-07-09 | CEMEX LLC - BLACK MT. QUARRY | APPLE VALLEY, San Bernardino, CA | Pass | Local |
| 2026-07-09 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-09 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-09 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-09 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-09 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-09 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-09 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-09 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-09 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-09 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-09 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-09 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-09 | CHEVRON USA INC- HEAVY OIL — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-07 | BRONCO WINE COMPANY | CERES, Stanislaus, CA | Pass | Local |
| 2026-07-07 | BRONCO WINE COMPANY | CERES, Stanislaus, CA | Pass | Local |
| 2026-07-07 | BRONCO WINE COMPANY | CERES, Stanislaus, CA | Pass | Local |
| 2026-07-07 | BRONCO WINE COMPANY | CERES, Stanislaus, CA | Pass | Local |
| 2026-07-07 | BRONCO WINE COMPANY | CERES, Stanislaus, CA | Pass | Local |
| 2026-07-07 | BRONCO WINE COMPANY | CERES, Stanislaus, CA | Pass | Local |
| 2026-07-01 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-01 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-01 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-01 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-01 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-01 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-01 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-01 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-01 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-01 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-01 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-01 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-01 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-01 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-30 | FOOTHILL SANITARY LANDFILL — high-priority violation on file | LINDEN, San Joaquin, CA | Pass | Local |
| 2026-06-30 | FOOTHILL SANITARY LANDFILL — high-priority violation on file | LINDEN, San Joaquin, CA | Pass | Local |
| 2026-06-30 | FOOTHILL SANITARY LANDFILL — high-priority violation on file | LINDEN, San Joaquin, CA | Pass | Local |
| 2026-06-30 | FOOTHILL SANITARY LANDFILL — high-priority violation on file | LINDEN, San Joaquin, CA | Pass | Local |
| 2026-06-30 | FOOTHILL SANITARY LANDFILL — high-priority violation on file | LINDEN, San Joaquin, CA | Pass | Local |
| 2026-06-30 | FOOTHILL SANITARY LANDFILL — high-priority violation on file | LINDEN, San Joaquin, CA | Pass | Local |
| 2026-06-25 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-24 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-24 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-24 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-24 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-24 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-23 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-23 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-23 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-23 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-23 | HILMAR CHEESE COMPANY — high-priority violation on file | HILMAR, Merced, CA | Pass | Local |
| 2026-06-23 | HILMAR CHEESE COMPANY — high-priority violation on file | HILMAR, Merced, CA | Pass | Local |
| 2026-06-23 | HILMAR CHEESE COMPANY — high-priority violation on file | HILMAR, Merced, CA | Pass | Local |
| 2026-06-23 | HILMAR CHEESE COMPANY — high-priority violation on file | HILMAR, Merced, CA | Pass | Local |
| 2026-06-16 | CALIFORNIA RESOURCES PRODUCTION CORP | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-16 | CALIFORNIA RESOURCES PRODUCTION CORP | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-16 | CALIFORNIA RESOURCES PRODUCTION CORP | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-11 | THE WINE GROUP, INC | RIPON, San Joaquin, CA | Pass | Local |
| 2026-06-11 | THE WINE GROUP, INC | RIPON, San Joaquin, CA | Pass | Local |
| 2026-06-11 | THE WINE GROUP, INC | RIPON, San Joaquin, CA | Pass | Local |
| 2026-06-11 | THE WINE GROUP, INC | RIPON, San Joaquin, CA | Pass | Local |
| 2026-06-11 | THE WINE GROUP, INC | RIPON, San Joaquin, CA | Pass | Local |
| 2026-06-09 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
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Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.