EPA Air · stack tests by county and year
Air-emissions stack tests in Los Angeles County, California, 2026
- 39Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit. Each row below is one stack test recorded against a source in Los Angeles County, California during 2026. A facility can appear several times: this is the year’s record of what happened, not a list of places. The sources themselves are on the Los Angeles County facility page.
Los Angeles County, California, 2026
- Inspections 146
Air-emissions stack tests in Los Angeles County, other years
Air-emissions stack tests recorded in Los Angeles County, California, 2026
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2026-05-28 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | Pass | Local |
| 2026-05-26 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | Pass | Local |
| 2026-05-26 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | Pass | Local |
| 2026-05-21 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | Pass | Local |
| 2026-05-20 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | Pass | Local |
| 2026-05-20 | LA CO. SANITATION DIST | Pass | Local |
| 2026-05-19 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | Pass | Local |
| 2026-05-13 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | Pass | Local |
| 2026-05-07 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | Pass | Local |
| 2026-05-04 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | Pass | Local |
| 2026-04-28 | SUNSHINE CYN LANDFILL REPUBLIC SERV INC | Pass | Local |
| 2026-04-27 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | Pass | Local |
| 2026-04-20 | THUMS LONG BEACH CO — high-priority violation on file | Pass | Local |
| 2026-04-16 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | Pass | Local |
| 2026-04-15 | LA CO. SANITATION DIST | Pass | Local |
| 2026-04-07 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | Pass | Local |
| 2026-03-27 | LA CO. SANITATION DIST | Pass | Local |
| 2026-03-20 | TESORO REFINING AND MARKETING CO, LLC | Pass | Local |
| 2026-03-18 | TESORO REFINING AND MARKETING CO — high-priority violation on file | Pass | Local |
| 2026-03-18 | LA CITY, SANITATION BUREAU (HTP) | Pass | Local |
| 2026-03-16 | TESORO REFINING AND MARKETING CO — high-priority violation on file | Pass | Local |
| 2026-03-16 | TESORO REFINING AND MARKETING CO, LLC | Pass | Local |
| 2026-03-05 | AIR LIQUID LARGE INDUSTRIES US, LP | Pass | Local |
| 2026-03-04 | LUNDAY-THAGARD CO DBA WORLD OIL REFINING — high-priority violation on file | Pass | Local |
| 2026-03-04 | SUNSHINE GAS PRODUCERS LLC | Pass | Local |
| 2026-03-04 | SUNSHINE GAS PRODUCERS LLC | Pass | Local |
| 2026-03-04 | SUNSHINE GAS PRODUCERS LLC | Pass | Local |
| 2026-03-04 | SUNSHINE GAS PRODUCERS LLC | Pass | Local |
| 2026-03-04 | SUNSHINE GAS PRODUCERS LLC | Pass | Local |
| 2026-03-03 | LA CNTY SANITATION DISTRICT-PUENTE HILLS | Pass | Local |
| 2026-02-19 | AIR LIQUID LARGE INDUSTRIES US, LP | Pass | Local |
| 2026-02-12 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | Pass | Local |
| 2026-02-03 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | Pass | Local |
| 2026-01-27 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | Pass | Local |
| 2026-01-26 | VALERO WILMINGTON ASPHALT PLANT | Pass | Local |
| 2026-01-23 | OLYMPUS TERMINALS LLC | Pass | Local |
| 2026-01-22 | AIR LIQUID LARGE INDUSTRIES US, LP | Pass | Local |
| 2026-01-08 | SO CAL EDISON CO | Pass | Local |
| 2026-01-05 | SO CAL EDISON CO | Pass | Local |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.