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
Air-emissions stack tests recorded in Lewis County, Washington, 2025
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2025-12-10 | HARDEL MUTUAL PLYWOOD CORPORATION — high-priority violation on file | Pass | Local |
| 2025-12-09 | HARDEL MUTUAL PLYWOOD CORPORATION — high-priority violation on file | Pass | Local |
| 2025-11-04 | TRANSALTA CENTRALIA GENERATION, LLC — high-priority violation on file | Pass | Local |
| 2025-10-22 | PUGET SOUND ENERGY (WA NATURAL GAS) | Pass | Local |
| 2025-10-21 | PUGET SOUND ENERGY (WA NATURAL GAS) | Pass | Local |
| 2025-10-21 | PUGET SOUND ENERGY (WA NATURAL GAS) | Pass | Local |
| 2025-10-20 | PUGET SOUND ENERGY (WA NATURAL GAS) | Pass | Local |
| 2025-09-16 | TRANSALTA CENTRALIA GENERATION, LLC — high-priority violation on file | Pass | Local |
| 2025-07-30 | TRANSALTA CENTRALIA GENERATION, LLC — high-priority violation on file | Pass | Local |
| 2025-05-08 | ROCKY MOUNTAIN POWER - CHEHALIS POWER GENERATING, L.P. | Pass | Local |
| 2025-05-07 | ROCKY MOUNTAIN POWER - CHEHALIS POWER GENERATING, L.P. | Pass | Local |
| 2025-05-06 | ROCKY MOUNTAIN POWER - CHEHALIS POWER GENERATING, L.P. | Pass | Local |
| 2025-05-06 | PUGET SOUND ENERGY (WA NATURAL GAS) | Pass | Local |
| 2025-03-25 | TRANSALTA CENTRALIA GENERATION, LLC — high-priority violation on file | Pass | Local |
| 2025-02-18 | HAMPTON LUMBER MILLS - MORTON | Pass | Local |
| 2025-01-30 | HARDEL MUTUAL PLYWOOD CORPORATION — high-priority violation on file | Pass | Local |
| 2025-01-15 | TRANSALTA CENTRALIA GENERATION, LLC — high-priority violation on file | Pass | Local |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.