EPA Air · stack tests by county and year
Air-emissions stack tests in Skagit County, Washington, 2026
- 3Stack 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 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 Skagit County facility page.
Skagit County, Washington, 2026
- Inspections 21
Air-emissions stack tests in Skagit County, other years
Air-emissions stack tests recorded in Skagit County, Washington, 2026
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2026-02-26 | TESORO REFINING AND MARKETING COMPANY | Pass | Local |
| 2026-02-25 | TESORO REFINING AND MARKETING COMPANY | Pass | Local |
| 2026-02-24 | TESORO REFINING AND MARKETING COMPANY | Pass | Local |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.
What this page shows
This page covers Clean Air Act facilities in the EPA air register with stack tests in Skagit county, WA, in 2026. Stack tests recorded in 2026: 3.