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 |
|---|---|---|---|---|
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-27 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-26 | VALERO WILMINGTON ASPHALT PLANT | WILMINGTON, Los Angeles, CA | Pass | Local |
| 2026-01-23 | OLYMPUS TERMINALS LLC | CARSON, Los Angeles, CA | Pass | Local |
| 2026-01-22 | AIR LIQUID LARGE INDUSTRIES US, LP | EL SEGUNDO, Los Angeles, CA | Pass | Local |
| 2026-01-22 | BRIDGE ENERGY, LLC | BREA, Orange, CA | Pass | Local |
| 2026-01-21 | BRIDGE ENERGY, LLC | BREA, Orange, CA | Pass | Local |
| 2026-01-20 | BRIDGE ENERGY, LLC | BREA, Orange, CA | Pass | Local |
| 2026-01-20 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-01-20 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-01-20 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-01-20 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-01-20 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-01-20 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-01-20 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-01-20 | CALIFORNIA DAIRIES, INC. — high-priority violation on file | TURLOCK, Stanislaus, CA | Pass | Local |
| 2026-01-20 | CALIFORNIA DAIRIES, INC. — high-priority violation on file | TURLOCK, Stanislaus, CA | Pass | Local |
| 2026-01-20 | CALIFORNIA DAIRIES, INC. — high-priority violation on file | TURLOCK, Stanislaus, CA | Pass | Local |
| 2026-01-20 | CALIFORNIA DAIRIES, INC. — high-priority violation on file | TURLOCK, Stanislaus, CA | Pass | Local |
| 2026-01-20 | CALIFORNIA DAIRIES, INC. — high-priority violation on file | TURLOCK, Stanislaus, CA | Pass | Local |
| 2026-01-20 | CALIFORNIA DAIRIES, INC. — high-priority violation on file | TURLOCK, Stanislaus, CA | Pass | Local |
| 2026-01-19 | SAN JOAQUIN REFINING CO — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-19 | SAN JOAQUIN REFINING CO — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-19 | SAN JOAQUIN REFINING CO — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-15 | AERA ENERGY LLC | SAN ARDO, Monterey, CA | Pass | Local |
| 2026-01-15 | AERA ENERGY LLC | SAN ARDO, Monterey, CA | Pass | Local |
| 2026-01-15 | CRESTWOOD WEST COAST LLC | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-15 | CRESTWOOD WEST COAST LLC | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-15 | CRESTWOOD WEST COAST LLC | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-15 | CRESTWOOD WEST COAST LLC | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-15 | SAPUTO CHEESE USA INC | TULARE, Tulare, CA | Pass | Local |
| 2026-01-15 | SAPUTO CHEESE USA INC | TULARE, Tulare, CA | Pass | Local |
| 2026-01-15 | SAPUTO CHEESE USA INC | TULARE, Tulare, CA | Pass | Local |
| 2026-01-15 | SAPUTO CHEESE USA INC | TULARE, Tulare, CA | Pass | Local |
| 2026-01-14 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-14 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-14 | TULARE LAKE COMPOST | KETTLEMAN CITY, Kings, CA | Pass | Local |
| 2026-01-14 | TULARE LAKE COMPOST | KETTLEMAN CITY, Kings, CA | Pass | Local |
| 2026-01-14 | TULARE LAKE COMPOST | KETTLEMAN CITY, Kings, CA | Pass | Local |
| 2026-01-14 | TULARE LAKE COMPOST | KETTLEMAN CITY, Kings, CA | Pass | Local |
| 2026-01-14 | TULARE LAKE COMPOST | KETTLEMAN CITY, Kings, CA | Pass | Local |
| 2026-01-14 | TULARE LAKE COMPOST | KETTLEMAN CITY, Kings, CA | Pass | Local |
| 2026-01-13 | CRESTWOOD WEST COAST LLC | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-13 | CRESTWOOD WEST COAST LLC | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-13 | CRESTWOOD WEST COAST LLC | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-13 | CRESTWOOD WEST COAST LLC | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | HIGH DESERT POWER PROJECT, LLC | VICTORVILLE, San Bernardino, CA | Pass | Local |
| 2026-01-08 | HIGH DESERT POWER PROJECT, LLC | VICTORVILLE, San Bernardino, CA | Pass | Local |
| 2026-01-08 | HIGH DESERT POWER PROJECT, LLC | VICTORVILLE, San Bernardino, CA | Pass | Local |
| 2026-01-08 | SO CAL EDISON CO | AVALON, Los Angeles, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-08 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-07 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-07 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-07 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-07 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-07 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.