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 |
|---|---|---|---|---|
| 2025-10-29 | WELLHEAD POWER PANOCHE, LLC — high-priority violation on file | FIREBAUGH, Fresno, CA | Pass | Local |
| 2025-10-28 | LA CITY DWP- VALLEY GENERATING STN | SUN VALLEY, Los Angeles, CA | Pass | Local |
| 2025-10-28 | PHILLIPS 66 COMPANY/LA REFINERY | CARSON, Los Angeles, CA | Pass | Local |
| 2025-10-28 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-10-28 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-10-28 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-10-28 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-10-28 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-10-28 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-10-28 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-10-28 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-10-28 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-10-28 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-10-28 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-10-28 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-10-28 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-10-28 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-10-28 | E & J GALLO WINERY | FRESNO, Fresno, CA | Pass | Local |
| 2025-10-28 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-10-28 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-10-28 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-10-28 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-10-28 | CALIFORNIA RESOURCES PRODUCTION CORP — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-10-28 | NORTH COUNTY SANITARY LANDFILL | LODI, San Joaquin, CA | Pass | Local |
| 2025-10-28 | NORTH COUNTY SANITARY LANDFILL | LODI, San Joaquin, CA | Pass | Local |
| 2025-10-28 | NORTH COUNTY SANITARY LANDFILL | LODI, San Joaquin, CA | Pass | Local |
| 2025-10-28 | NORTH COUNTY SANITARY LANDFILL | LODI, San Joaquin, CA | Pass | Local |
| 2025-10-28 | NORTH COUNTY SANITARY LANDFILL | LODI, San Joaquin, CA | Pass | Local |
| 2025-10-28 | NORTH COUNTY SANITARY LANDFILL | LODI, San Joaquin, CA | Pass | Local |
| 2025-10-28 | NORTH COUNTY SANITARY LANDFILL | LODI, San Joaquin, CA | Pass | Local |
| 2025-10-28 | NORTH COUNTY SANITARY LANDFILL | LODI, San Joaquin, CA | Pass | Local |
| 2025-10-28 | NORTH COUNTY SANITARY LANDFILL | LODI, San Joaquin, CA | Pass | Local |
| 2025-10-28 | NORTH COUNTY SANITARY LANDFILL | LODI, San Joaquin, CA | Pass | Local |
| 2025-10-27 | LADW&P-HAYNES STEAM | LONG BEACH, Los Angeles, CA | Pass | Local |
| 2025-10-27 | SAN JOAQUIN REFINING CO — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-10-27 | SAN JOAQUIN REFINING CO — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-10-25 | LA CITY DWP- VALLEY GENERATING STN | SUN VALLEY, Los Angeles, CA | Pass | Local |
| 2025-10-24 | LADW&P-HAYNES STEAM | LONG BEACH, Los Angeles, CA | Pass | Local |
| 2025-10-24 | CRESTWOOD WEST COAST LLC | BAKERSFIELD, Kern, CA | Fail | Local |
| 2025-10-24 | CRESTWOOD WEST COAST LLC | BAKERSFIELD, Kern, CA | Fail | Local |
| 2025-10-24 | CRESTWOOD WEST COAST LLC | BAKERSFIELD, Kern, CA | Fail | Local |
| 2025-10-24 | CRESTWOOD WEST COAST LLC | BAKERSFIELD, Kern, CA | Fail | Local |
| 2025-10-23 | SACRAMENTO AREA SEWER DISTRICT | ELK GROVE, Sacramento, CA | Pending | Local |
| 2025-10-23 | PHILLIPS 66 CO/LA REFINERY WILMINGTON — high-priority violation on file | WILMINGTON, Los Angeles, CA | Pass | Local |
| 2025-10-23 | PHILLIPS 66 CO/LA REFINERY WILMINGTON — high-priority violation on file | WILMINGTON, Los Angeles, CA | Pass | Local |
| 2025-10-23 | PHILLIPS 66 CO/LA REFINERY WILMINGTON — high-priority violation on file | WILMINGTON, Los Angeles, CA | Pass | Local |
| 2025-10-23 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2025-10-23 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2025-10-23 | KRAFT HEINZ FOODS CO | TULARE, Tulare, CA | Pass | Local |
| 2025-10-23 | KRAFT HEINZ FOODS CO | TULARE, Tulare, CA | Pass | Local |
| 2025-10-23 | KRAFT HEINZ FOODS CO | TULARE, Tulare, CA | Pass | Local |
| 2025-10-22 | LADW&P-HAYNES STEAM | LONG BEACH, Los Angeles, CA | Pass | Local |
| 2025-10-21 | PG&E- HINKLEY | HINKLEY, San Bernardino, CA | Pass | Local |
| 2025-10-21 | CHEVRON MINING INC | MOUNTAIN PASS, San Bernardino, CA | Pass | Local |
| 2025-10-21 | OLS ENERGY CHINO | CHINO, San Bernardino, CA | Pass | Local |
| 2025-10-21 | SIMI VALLEY LANDFILL & RECYCLING CENTER — high-priority violation on file | SIMI VALLEY, Ventura, CA | Fail | Local |
| 2025-10-20 | PHILLIPS 66 COMPANY/LA REFINERY | CARSON, Los Angeles, CA | Pass | Local |
| 2025-10-20 | OLS ENERGY CHINO | CHINO, San Bernardino, CA | Pass | Local |
| 2025-10-20 | OLS ENERGY CHINO | CHINO, San Bernardino, CA | Pass | Local |
| 2025-10-17 | QG PRINTING CORP — high-priority violation on file | RIVERSIDE, Riverside, CA | Pass | Local |
| 2025-10-16 | IMPERIAL IRRIGATION DISTRICT/COACHELLA | COACHELLA, Riverside, CA | Pass | Local |
| 2025-10-16 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-10-15 | IMPERIAL IRRIGATION DISTRICT/COACHELLA | COACHELLA, Riverside, CA | Pass | Local |
| 2025-10-14 | MONTEREY REGIONAL WASTE MGMT DIST | MARINA, Monterey, CA | Pass | Local |
| 2025-10-09 | AERA ENERGY LLC | SAN ARDO, Monterey, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-07 | PROCTER & GAMBLE | SACRAMENTO, Sacramento, CA | Pass | Local |
| 2025-10-07 | INLAND EMPIRE UTILITY AGENCY, A MUN WATER DIS | ONTARIO, San Bernardino, CA | Pass | Local |
| 2025-10-07 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-07 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-07 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-07 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-07 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.