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 |
|---|---|---|---|---|
| 2025-06-09 | SYCAMORE COGEN CO — high-priority violation on file | OILDALE, Kern, CA | Pass | Local |
| 2025-06-09 | SYCAMORE COGEN CO — high-priority violation on file | OILDALE, Kern, CA | Pass | Local |
| 2025-06-09 | SYCAMORE COGEN CO — high-priority violation on file | OILDALE, Kern, CA | Pass | Local |
| 2025-06-09 | SYCAMORE COGEN CO — high-priority violation on file | OILDALE, Kern, CA | Pass | Local |
| 2025-06-09 | SYCAMORE COGEN CO — high-priority violation on file | OILDALE, Kern, CA | Pass | Local |
| 2025-06-09 | SYCAMORE COGEN CO — high-priority violation on file | OILDALE, Kern, CA | Pass | Local |
| 2025-06-09 | CHALK CLIFF LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-09 | CHALK CLIFF LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-09 | CHALK CLIFF LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-09 | CHALK CLIFF LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-09 | CHALK CLIFF LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-09 | CHALK CLIFF LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-09 | CHALK CLIFF LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-09 | CHALK CLIFF LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-09 | CHALK CLIFF LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-09 | CHALK CLIFF LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-09 | CHALK CLIFF LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-09 | CHALK CLIFF LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-09 | CHALK CLIFF LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-09 | CHALK CLIFF LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-09 | CHALK CLIFF LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-09 | CHALK CLIFF LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-09 | CHALK CLIFF LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-09 | CHALK CLIFF LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-09 | CHALK CLIFF LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-09 | CHALK CLIFF LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-09 | CHALK CLIFF LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-09 | CHALK CLIFF LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-09 | CHALK CLIFF LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-09 | CHALK CLIFF LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-09 | CHALK CLIFF LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-09 | CHALK CLIFF LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-09 | CHALK CLIFF LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-09 | CHALK CLIFF LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-09 | CHALK CLIFF LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-09 | CHALK CLIFF LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-09 | CHALK CLIFF LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-09 | CHALK CLIFF LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-09 | CHALK CLIFF LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-09 | CHALK CLIFF LIMITED | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-06 | LADW&P-HAYNES STEAM | LONG BEACH, Los Angeles, CA | Pass | Local |
| 2025-06-06 | CARBON CALIFORNIA COMPANY, LLC — high-priority violation on file | FILLMORE, Ventura, CA | Pass | Local |
| 2025-06-05 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-05 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-05 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-05 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-05 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-05 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-05 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-05 | HILMAR CHEESE COMPANY — high-priority violation on file | HILMAR, Merced, CA | Pass | Local |
| 2025-06-05 | HILMAR CHEESE COMPANY — high-priority violation on file | HILMAR, Merced, CA | Pass | Local |
| 2025-06-05 | HILMAR CHEESE COMPANY — high-priority violation on file | HILMAR, Merced, CA | Pass | Local |
| 2025-06-05 | HILMAR CHEESE COMPANY — high-priority violation on file | HILMAR, Merced, CA | Pass | Local |
| 2025-06-05 | PACIFIC SOUTHWEST CONTAINER, LLC | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-05 | PACIFIC SOUTHWEST CONTAINER, LLC | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-05 | PACIFIC SOUTHWEST CONTAINER, LLC | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-05 | PACIFIC SOUTHWEST CONTAINER, LLC | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-05 | PACIFIC SOUTHWEST CONTAINER, LLC | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-05 | PACIFIC SOUTHWEST CONTAINER, LLC | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-06-05 | LAND O' LAKES, INC — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-06-05 | LAND O' LAKES, INC — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-06-05 | LAND O' LAKES, INC — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-06-05 | LAND O' LAKES, INC — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-06-05 | LAND O' LAKES, INC — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-06-04 | WALNUT CREEK ENERGY, LLC | CITY OF INDUSTRY, Los Angeles, CA | Pass | Local |
| 2025-06-04 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-04 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-04 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-04 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-04 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-04 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-04 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-04 | HILMAR CHEESE COMPANY — high-priority violation on file | HILMAR, Merced, CA | Pass | Local |
| 2025-06-04 | HILMAR CHEESE COMPANY — high-priority violation on file | HILMAR, Merced, CA | Pass | Local |
| 2025-06-04 | HILMAR CHEESE COMPANY — high-priority violation on file | HILMAR, Merced, CA | Pass | Local |
| 2025-06-04 | HILMAR CHEESE COMPANY — high-priority violation on file | HILMAR, Merced, CA | Pass | Local |
| 2025-06-04 | HILMAR CHEESE COMPANY — high-priority violation on file | HILMAR, Merced, CA | Pass | Local |
| 2025-06-04 | HILMAR CHEESE COMPANY — high-priority violation on file | HILMAR, Merced, CA | Pass | Local |
| 2025-06-04 | HILMAR CHEESE COMPANY — high-priority violation on file | HILMAR, Merced, CA | Pass | Local |
| 2025-06-04 | HILMAR CHEESE COMPANY — high-priority violation on file | HILMAR, Merced, CA | Pass | Local |
| 2025-06-04 | HILMAR CHEESE COMPANY — high-priority violation on file | HILMAR, Merced, CA | Pass | Local |
| 2025-06-03 | LADW&P-HAYNES STEAM | LONG BEACH, Los Angeles, CA | Pass | Local |
| 2025-06-03 | WALNUT CREEK ENERGY, LLC | CITY OF INDUSTRY, Los Angeles, CA | Pass | Local |
| 2025-06-03 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-03 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-03 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-03 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-03 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-03 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-03 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-06-03 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2025-06-03 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2025-06-03 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2025-06-03 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2025-06-03 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2025-06-03 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2025-06-03 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2025-06-03 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2025-06-03 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2025-06-03 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.