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 |
|---|---|---|---|---|
| 2025-07-02 | U S INTEC, INC | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-07-02 | U S INTEC, INC | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-07-02 | U S INTEC, INC | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-07-01 | SENECA RESOURCES — high-priority violation on file | MCKITTRICK, Kern, CA | Pass | Local |
| 2025-07-01 | SENECA RESOURCES — high-priority violation on file | MCKITTRICK, Kern, CA | Pass | Local |
| 2025-07-01 | SENECA RESOURCES — high-priority violation on file | MCKITTRICK, Kern, CA | Pass | Local |
| 2025-06-30 | CRIMSON RESOURCE MANAGEMENT | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-30 | CRIMSON RESOURCE MANAGEMENT | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-30 | BRONCO WINE COMPANY | CERES, Stanislaus, CA | Pass | Local |
| 2025-06-30 | BRONCO WINE COMPANY | CERES, Stanislaus, CA | Pass | Local |
| 2025-06-30 | BRONCO WINE COMPANY | CERES, Stanislaus, CA | Pass | Local |
| 2025-06-30 | BRONCO WINE COMPANY | CERES, Stanislaus, CA | Pass | Local |
| 2025-06-30 | BRONCO WINE COMPANY | CERES, Stanislaus, CA | Pass | Local |
| 2025-06-30 | BRONCO WINE COMPANY | CERES, Stanislaus, CA | Pass | Local |
| 2025-06-26 | WALNUT CREEK ENERGY, LLC | CITY OF INDUSTRY, Los Angeles, CA | Pass | Local |
| 2025-06-26 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-26 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-26 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-26 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-26 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-26 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-26 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-26 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-26 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-26 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-26 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-26 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-26 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-26 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-26 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-26 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-26 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-26 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-26 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-26 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-26 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-26 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-26 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-26 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-26 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-26 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-26 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-26 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-26 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-26 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-26 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-26 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-26 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-25 | AMERESCO SANTA CRUZ ENERGY LLC | WATSONVILLE, Santa Cruz, CA | Fail | Local |
| 2025-06-25 | AMERESCO SANTA CRUZ ENERGY LLC | WATSONVILLE, Santa Cruz, CA | Pass | Local |
| 2025-06-25 | PROCTER & GAMBLE | SACRAMENTO, Sacramento, CA | Incomplete | Local |
| 2025-06-25 | SD CITY PT LOMA WASTEWATER TREATMENT | SAN DIEGO, San Diego, CA | Pass | Local |
| 2025-06-24 | SO CAL GAS CO | VALENCIA, Los Angeles, CA | Pass | Local |
| 2025-06-24 | SO CAL GAS CO | VALENCIA, Los Angeles, CA | Pass | Local |
| 2025-06-24 | SO CAL GAS CO | VALENCIA, Los Angeles, CA | Pass | Local |
| 2025-06-24 | AES HUNTINGTON BEACH LLC | HUNTINGTON BEACH, Orange, CA | Pass | Local |
| 2025-06-24 | ALLIED WASTE-SYCAMORE LANDFILL | SAN DIEGO, San Diego, CA | Pass | Local |
| 2025-06-24 | CALIFORNIA RESOURCES PRODUCTION CORP | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-24 | CALIFORNIA RESOURCES PRODUCTION CORP | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-24 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-24 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-24 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-24 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-24 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-24 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-24 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-24 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-24 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-24 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-24 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-24 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-24 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-24 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-24 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-24 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-24 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-24 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-24 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-24 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-24 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-23 | LA CITY DWP- VALLEY GENERATING STN | SUN VALLEY, Los Angeles, CA | Pass | Local |
| 2025-06-23 | AMERESCO FORWARD, LLC | MANTECA, San Joaquin, CA | Pass | Local |
| 2025-06-23 | AMERESCO FORWARD, LLC | MANTECA, San Joaquin, CA | Pass | Local |
| 2025-06-23 | AMERESCO FORWARD, LLC | MANTECA, San Joaquin, CA | Pass | Local |
| 2025-06-23 | AMERESCO FORWARD, LLC | MANTECA, San Joaquin, CA | Pass | Local |
| 2025-06-23 | AMERESCO FORWARD, LLC | MANTECA, San Joaquin, CA | Pass | Local |
| 2025-06-23 | AMERESCO FORWARD, LLC | MANTECA, San Joaquin, CA | Pass | Local |
| 2025-06-23 | AMERESCO FORWARD, LLC | MANTECA, San Joaquin, CA | Pass | Local |
| 2025-06-23 | AMERESCO FORWARD, LLC | MANTECA, San Joaquin, CA | Pass | Local |
| 2025-06-23 | AMERESCO FORWARD, LLC | MANTECA, San Joaquin, CA | Pass | Local |
| 2025-06-23 | AMERESCO FORWARD, LLC | MANTECA, San Joaquin, CA | Pass | Local |
| 2025-06-23 | AMERESCO FORWARD, LLC | MANTECA, San Joaquin, CA | Pass | Local |
| 2025-06-23 | AMERESCO FORWARD, LLC | MANTECA, San Joaquin, CA | Pass | Local |
| 2025-06-23 | AMERESCO FORWARD, LLC | MANTECA, San Joaquin, CA | Pass | Local |
| 2025-06-23 | AMERESCO FORWARD, LLC | MANTECA, San Joaquin, CA | Pass | Local |
| 2025-06-23 | AMERESCO FORWARD, LLC | MANTECA, San Joaquin, CA | Pass | Local |
| 2025-06-23 | AMERESCO FORWARD, LLC | MANTECA, San Joaquin, CA | Pass | Local |
| 2025-06-23 | AMERESCO FORWARD, LLC | MANTECA, San Joaquin, CA | Pass | Local |
| 2025-06-23 | AMERESCO FORWARD, LLC | MANTECA, San Joaquin, CA | Pass | Local |
| 2025-06-19 | SAN JOAQUIN VALLEY CONCENTRATES | FRESNO, Fresno, CA | Pass | Local |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.