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 |
|---|---|---|---|---|
| 2025-06-19 | SAN JOAQUIN VALLEY CONCENTRATES | FRESNO, Fresno, CA | Pass | Local |
| 2025-06-19 | SAN JOAQUIN VALLEY CONCENTRATES | FRESNO, Fresno, CA | Pass | Local |
| 2025-06-19 | SAN JOAQUIN VALLEY CONCENTRATES | FRESNO, Fresno, CA | Pass | Local |
| 2025-06-19 | SAN JOAQUIN VALLEY CONCENTRATES | FRESNO, Fresno, CA | Pass | Local |
| 2025-06-19 | SAN JOAQUIN VALLEY CONCENTRATES | FRESNO, Fresno, CA | Pass | Local |
| 2025-06-19 | SAN JOAQUIN VALLEY CONCENTRATES | FRESNO, Fresno, CA | Pass | Local |
| 2025-06-19 | SAN JOAQUIN VALLEY CONCENTRATES | FRESNO, Fresno, CA | Pass | Local |
| 2025-06-19 | SAN JOAQUIN VALLEY CONCENTRATES | FRESNO, Fresno, CA | Pass | Local |
| 2025-06-19 | SAN JOAQUIN VALLEY CONCENTRATES | FRESNO, Fresno, CA | Pass | Local |
| 2025-06-19 | SAN JOAQUIN VALLEY CONCENTRATES | FRESNO, Fresno, CA | Pass | Local |
| 2025-06-19 | SAN JOAQUIN VALLEY CONCENTRATES | FRESNO, Fresno, CA | Pass | Local |
| 2025-06-19 | SAN JOAQUIN VALLEY CONCENTRATES | FRESNO, Fresno, CA | Pass | Local |
| 2025-06-19 | SAN JOAQUIN VALLEY CONCENTRATES | FRESNO, Fresno, CA | Pass | Local |
| 2025-06-19 | SAN JOAQUIN VALLEY CONCENTRATES | FRESNO, Fresno, CA | Pass | Local |
| 2025-06-19 | SAN JOAQUIN VALLEY CONCENTRATES | FRESNO, Fresno, CA | Pass | Local |
| 2025-06-19 | SAN JOAQUIN VALLEY CONCENTRATES | FRESNO, Fresno, CA | Pass | Local |
| 2025-06-19 | SAN JOAQUIN VALLEY CONCENTRATES | FRESNO, Fresno, CA | Pass | Local |
| 2025-06-19 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-19 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-19 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-19 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-19 | CA DEPT CORRECTIONS STATE PRISON-AVENAL | AVENAL, Kings, CA | Pass | Local |
| 2025-06-19 | CA DEPT CORRECTIONS STATE PRISON-AVENAL | AVENAL, Kings, CA | Pass | Local |
| 2025-06-19 | CA DEPT CORRECTIONS STATE PRISON-AVENAL | AVENAL, Kings, CA | Pass | Local |
| 2025-06-19 | CA DEPT CORRECTIONS STATE PRISON-AVENAL | AVENAL, Kings, CA | Pass | Local |
| 2025-06-19 | CA DEPT CORRECTIONS STATE PRISON-AVENAL | AVENAL, Kings, CA | Pass | Local |
| 2025-06-19 | CA DEPT CORRECTIONS STATE PRISON-AVENAL | AVENAL, Kings, CA | Pass | Local |
| 2025-06-19 | CA DEPT CORRECTIONS STATE PRISON-AVENAL | AVENAL, Kings, CA | Pass | Local |
| 2025-06-19 | CA DEPT CORRECTIONS STATE PRISON-AVENAL | AVENAL, Kings, CA | Pass | Local |
| 2025-06-19 | CA DEPT CORRECTIONS STATE PRISON-AVENAL | AVENAL, Kings, CA | Pass | Local |
| 2025-06-19 | CA DEPT CORRECTIONS STATE PRISON-AVENAL | AVENAL, Kings, CA | Pass | Local |
| 2025-06-19 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-19 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-19 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-19 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-19 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-19 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-19 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-19 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-19 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-19 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-19 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-19 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-19 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-19 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-19 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-19 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-19 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-19 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-19 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-19 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-19 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-19 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-19 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-19 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-19 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-19 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-19 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-19 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-19 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-19 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-19 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-19 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-19 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-19 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-19 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-19 | TURLOCK IRRIGATION DISTRICT | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-18 | HUMBOLDT SAWMILL COMPANY — high-priority violation on file | SCOTIA, Humboldt, CA | Pass | Local |
| 2025-06-18 | LADW&P-HAYNES STEAM | LONG BEACH, Los Angeles, CA | Pass | Local |
| 2025-06-18 | HILMAR CHEESE COMPANY — high-priority violation on file | HILMAR, Merced, CA | Pass | Local |
| 2025-06-18 | HILMAR CHEESE COMPANY — high-priority violation on file | HILMAR, Merced, CA | Pass | Local |
| 2025-06-18 | HILMAR CHEESE COMPANY — high-priority violation on file | HILMAR, Merced, CA | Pass | Local |
| 2025-06-18 | NUSTAR TERMINALS OPS PARTNERSHIP LP | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-06-18 | NUSTAR TERMINALS OPS PARTNERSHIP LP | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-06-18 | NUSTAR TERMINALS OPS PARTNERSHIP LP | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-06-18 | NUSTAR TERMINALS OPS PARTNERSHIP LP | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-06-18 | NUSTAR TERMINALS OPS PARTNERSHIP LP | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-06-18 | NUSTAR TERMINALS OPS PARTNERSHIP LP | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-06-18 | NUSTAR TERMINALS OPS PARTNERSHIP LP | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-06-18 | NUSTAR TERMINALS OPS PARTNERSHIP LP | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-06-17 | MOSS LANDING POWER COMPANY LLC (FRMLY DYNEGY MOSS LANDING LLC) | MOSS LANDING, Monterey, CA | Pass | Local |
| 2025-06-17 | MOSS LANDING POWER COMPANY LLC (FRMLY DYNEGY MOSS LANDING LLC) | MOSS LANDING, Monterey, CA | Pass | Local |
| 2025-06-17 | MOSS LANDING POWER COMPANY LLC (FRMLY DYNEGY MOSS LANDING LLC) | MOSS LANDING, Monterey, CA | Pass | Local |
| 2025-06-17 | MOSS LANDING POWER COMPANY LLC (FRMLY DYNEGY MOSS LANDING LLC) | MOSS LANDING, Monterey, CA | Pass | Local |
| 2025-06-17 | SB CO LANDFILL - VICTORVILLE | VICTORVILLE, San Bernardino, CA | Pass | Local |
| 2025-06-17 | HUMBOLDT SAWMILL COMPANY — high-priority violation on file | SCOTIA, Humboldt, CA | Pass | Local |
| 2025-06-17 | CITY OF CLOVIS - LANDFILL | CLOVIS, Fresno, CA | Pass | Local |
| 2025-06-17 | CITY OF CLOVIS - LANDFILL | CLOVIS, Fresno, CA | Pass | Local |
| 2025-06-17 | CITY OF CLOVIS - LANDFILL | CLOVIS, Fresno, CA | Pass | Local |
| 2025-06-17 | CITY OF CLOVIS - LANDFILL | CLOVIS, Fresno, CA | Pass | Local |
| 2025-06-17 | CITY OF CLOVIS - LANDFILL | CLOVIS, Fresno, CA | Pass | Local |
| 2025-06-17 | CITY OF CLOVIS - LANDFILL | CLOVIS, Fresno, CA | Pass | Local |
| 2025-06-17 | CITY OF CLOVIS - LANDFILL | CLOVIS, Fresno, CA | Pass | Local |
| 2025-06-17 | CITY OF CLOVIS - LANDFILL | CLOVIS, Fresno, CA | Pass | Local |
| 2025-06-17 | CITY OF CLOVIS - LANDFILL | CLOVIS, Fresno, CA | Pass | Local |
| 2025-06-17 | CITY OF CLOVIS - LANDFILL | CLOVIS, Fresno, CA | Pass | Local |
| 2025-06-17 | CITY OF CLOVIS - LANDFILL | CLOVIS, Fresno, CA | Pass | Local |
| 2025-06-17 | CITY OF CLOVIS - LANDFILL | CLOVIS, Fresno, CA | Pass | Local |
| 2025-06-17 | CITY OF CLOVIS - LANDFILL | CLOVIS, Fresno, CA | Pass | Local |
| 2025-06-17 | CITY OF CLOVIS - LANDFILL | CLOVIS, Fresno, CA | Pass | Local |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.