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.