EPA Air · stack tests by county and year
Air-emissions stack tests in Skagit County, Washington, 2025
- 20Stack 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 Skagit County, Washington during 2025. 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 Skagit County facility page.
Skagit County, Washington, 2025
- Inspections 21
Air-emissions stack tests in Skagit County, other years
Air-emissions stack tests recorded in Skagit County, Washington, 2025
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2025-10-29 | TESORO REFINING AND MARKETING COMPANY | Pass | Local |
| 2025-10-21 | SIERRA PACIFIC IND.- SKAGIT LUMBER | Pass | Local |
| 2025-10-16 | SIERRA PACIFIC IND.- SKAGIT LUMBER | Pass | Local |
| 2025-10-15 | SIERRA PACIFIC IND.- SKAGIT LUMBER | Pass | Local |
| 2025-09-18 | CHEMTRADE SOLUTIONS LLC | Pass | Local |
| 2025-09-17 | CHEMTRADE SOLUTIONS LLC | Pass | Local |
| 2025-08-21 | HOLLYFRONTIER PUGET SOUND REFINERY | Pass | Local |
| 2025-08-20 | HOLLYFRONTIER PUGET SOUND REFINERY | Fail | Local |
| 2025-08-19 | HOLLYFRONTIER PUGET SOUND REFINERY | Pass | Local |
| 2025-08-18 | TESORO REFINING AND MARKETING COMPANY | Pass | Local |
| 2025-07-10 | HOLLYFRONTIER PUGET SOUND REFINERY | Pass | Local |
| 2025-07-10 | HOLLYFRONTIER PUGET SOUND REFINERY | Pass | Local |
| 2025-07-08 | HOLLYFRONTIER PUGET SOUND REFINERY | Pass | Local |
| 2025-05-30 | TESORO REFINING AND MARKETING COMPANY | Pass | Local |
| 2025-03-06 | TESORO REFINING AND MARKETING COMPANY | Pass | Local |
| 2025-02-28 | TESORO REFINING AND MARKETING COMPANY | Pass | Local |
| 2025-02-07 | TESORO REFINING AND MARKETING COMPANY | Pass | Local |
| 2025-01-22 | TESORO REFINING AND MARKETING COMPANY | Pass | Local |
| 2025-01-16 | PUGET SOUND ENERGY-FREDONIA | Pass | Local |
| 2025-01-14 | PUGET SOUND ENERGY-FREDONIA | Pass | Local |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.