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 |
|---|---|---|---|---|
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | PG&E | HOLT, San Joaquin, CA | Pass | Local |
| 2026-03-10 | G-3 ENTERPRISES LABEL DIVISION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-03-10 | G-3 ENTERPRISES LABEL DIVISION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-03-10 | G-3 ENTERPRISES LABEL DIVISION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-03-10 | G-3 ENTERPRISES LABEL DIVISION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-03-10 | G-3 ENTERPRISES LABEL DIVISION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-03-10 | G-3 ENTERPRISES LABEL DIVISION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-03-10 | G-3 ENTERPRISES LABEL DIVISION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-03-10 | G-3 ENTERPRISES LABEL DIVISION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-03-09 | AERA ENERGY LLC | SAN ARDO, Monterey, CA | Pass | Local |
| 2026-03-05 | AIR LIQUID LARGE INDUSTRIES US, LP | EL SEGUNDO, Los Angeles, CA | Pass | Local |
| 2026-03-05 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-03-04 | LUNDAY-THAGARD CO DBA WORLD OIL REFINING — high-priority violation on file | SOUTH GATE, Los Angeles, CA | Pass | Local |
| 2026-03-04 | SUNSHINE GAS PRODUCERS LLC | SYLMAR, Los Angeles, CA | Pass | Local |
| 2026-03-04 | SUNSHINE GAS PRODUCERS LLC | SYLMAR, Los Angeles, CA | Pass | Local |
| 2026-03-04 | SUNSHINE GAS PRODUCERS LLC | SYLMAR, Los Angeles, CA | Pass | Local |
| 2026-03-04 | SUNSHINE GAS PRODUCERS LLC | SYLMAR, Los Angeles, CA | Pass | Local |
| 2026-03-04 | SUNSHINE GAS PRODUCERS LLC | SYLMAR, Los Angeles, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-04 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-03 | LA CNTY SANITATION DISTRICT-PUENTE HILLS | CITY OF INDUSTRY, Los Angeles, CA | Pass | Local |
| 2026-03-03 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-03 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-03 | ALTAGAS RIPON ENERGY INC | RIPON, San Joaquin, CA | Pass | Local |
| 2026-03-03 | ALTAGAS RIPON ENERGY INC | RIPON, San Joaquin, CA | Pass | Local |
| 2026-03-03 | ALTAGAS RIPON ENERGY INC | RIPON, San Joaquin, CA | Pass | Local |
| 2026-03-03 | ALTAGAS RIPON ENERGY INC | RIPON, San Joaquin, CA | Pass | Local |
| 2026-03-03 | ALTAGAS RIPON ENERGY INC | RIPON, San Joaquin, CA | Pass | Local |
| 2026-03-03 | ALTAGAS RIPON ENERGY INC | RIPON, San Joaquin, CA | Pass | Local |
| 2026-03-03 | ALTAGAS RIPON ENERGY INC | RIPON, San Joaquin, CA | Pass | Local |
| 2026-03-03 | ALTAGAS RIPON ENERGY INC | RIPON, San Joaquin, CA | Pass | Local |
| 2026-03-03 | ALTAGAS RIPON ENERGY INC | RIPON, San Joaquin, CA | Pass | Local |
| 2026-03-03 | ALTAGAS RIPON ENERGY INC | RIPON, San Joaquin, CA | Pass | Local |
| 2026-03-03 | ALTAGAS RIPON ENERGY INC | RIPON, San Joaquin, CA | Pass | Local |
| 2026-03-03 | ALTAGAS RIPON ENERGY INC | RIPON, San Joaquin, CA | Pass | Local |
| 2026-03-03 | ALTAGAS RIPON ENERGY INC | RIPON, San Joaquin, CA | Pass | Local |
| 2026-03-03 | ALTAGAS RIPON ENERGY INC | RIPON, San Joaquin, CA | Pass | Local |
| 2026-02-26 | SACRAMENTO MUNICIPAL UTILITY DIST. FINANCING AUTHORITY DBA PROCTER GAMBLE POWER — high-priority violation on file | SACRAMENTO, Sacramento, CA | Fail | Local |
| 2026-02-24 | PROCTER & GAMBLE PAPER PRODUCTS — high-priority violation on file | OXNARD, Ventura, CA | Fail | Local |
| 2026-02-19 | AIR LIQUID LARGE INDUSTRIES US, LP | EL SEGUNDO, Los Angeles, CA | Pass | Local |
| 2026-02-19 | CALIFORNIA DAIRIES, INC. — high-priority violation on file | TURLOCK, Stanislaus, CA | Pass | Local |
| 2026-02-19 | CALIFORNIA DAIRIES, INC. — high-priority violation on file | TURLOCK, Stanislaus, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.