EPA Air · stack tests by county and year
Air-emissions stack tests in Cowlitz County, Washington, 2026
- 15Stack 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 Cowlitz 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 Cowlitz County facility page.
Cowlitz County, Washington, 2026
Air-emissions stack tests in Cowlitz County, other years
Air-emissions stack tests recorded in Cowlitz County, Washington, 2026
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2026-06-03 | LANXESS CORPORATION — high-priority violation on file | Pass | Local |
| 2026-05-12 | NIPPON DYNAWAVE PACKAGING COMPANY LLC — high-priority violation on file | Pass | State |
| 2026-03-24 | NIPPON DYNAWAVE PACKAGING COMPANY LLC — high-priority violation on file | Pass | State |
| 2026-03-04 | WESTROCK LONGVIEW LLC — high-priority violation on file | Pass | State |
| 2026-03-03 | WESTROCK LONGVIEW LLC — high-priority violation on file | Pass | State |
| 2026-02-18 | WESTROCK LONGVIEW LLC — high-priority violation on file | Pass | State |
| 2026-02-17 | WESTROCK LONGVIEW LLC — high-priority violation on file | Pass | State |
| 2026-02-17 | WESTROCK LONGVIEW LLC — high-priority violation on file | Pass | State |
| 2026-02-13 | WESTROCK LONGVIEW LLC — high-priority violation on file | Pass | State |
| 2026-02-12 | WESTROCK LONGVIEW LLC — high-priority violation on file | Pass | State |
| 2026-02-11 | WESTROCK LONGVIEW LLC — high-priority violation on file | Pass | State |
| 2026-02-10 | WESTROCK LONGVIEW LLC — high-priority violation on file | Pass | State |
| 2026-01-28 | MINT FARM GENERATION, LLC. | Pass | Local |
| 2026-01-21 | WESTROCK LONGVIEW LLC — high-priority violation on file | Pass | State |
| 2026-01-20 | WESTROCK LONGVIEW LLC — high-priority violation on file | Pass | State |
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 Cowlitz county, WA, for 2026. It lists 15 stack tests recorded in 2026.