EPA Air · stack tests by county and year
Air-emissions stack tests in Lewis County, Washington, 2025
- 17Stack 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 Lewis 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 Lewis County facility page.
Lewis County, Washington, 2025
Air-emissions stack tests in Lewis County, other years
What stands out
- Stack tests in Lewis County, Washington, rose from 13 in 2024, the previous year on file, to 17 in 2025.
- The county’s file for stack tests holds 10 years of events, from 2017 through 2026.
- Its 17 stack tests rank 6th of the 12 county cells in Washington for 2025.
- Its 17 stack tests are 6.5% of the 263 the state’s file holds for 2025.
Every line is computed by formula from the state’s stored file; nothing is estimated.
Air-emissions stack tests recorded in Lewis County, Washington, 2025
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 Lewis county, WA, for 2025. It lists 17 stack tests recorded in 2025.