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
What stands out
- Stack tests in Skagit County, Washington, fell from 23 in 2025, the previous year on file, to 3 in 2026.
- The county’s file for stack tests holds 10 years of events, from 2017 through 2026.
- Its 3 stack tests rank 6th of the 8 county cells in Washington for 2026.
- Its 3 stack tests are 3.4% of the 87 the state’s file holds for 2026.
Every line is computed by formula from the state’s stored file; nothing is estimated.
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.