EPA Air · stack tests by state and year
Air-emissions stack tests in Washington, 2026
- 46Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit. Every stack test below was recorded against a source in Washington during 2026; one facility can appear more than once, because this is a record of what happened rather than a list of places.
Counties in Washington, 2026
Washington, other years
Air-emissions stack tests recorded in Washington, 2026
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2026-07-29 | SIERRA PACIFIC INDUSTRIES - COGENERATION — high-priority violation on file | ABERDEEN, Grays Harbor, WA | Pending | Local |
| 2026-07-08 | PANELTECH — high-priority violation on file | HOQUIAM, Grays Harbor, WA | Pending | Local |
| 2026-06-03 | LANXESS CORPORATION — high-priority violation on file | KALAMA, Cowlitz, WA | Pass | Local |
| 2026-05-27 | CENTRIO (WESTERN) | SEATTLE, King, WA | Pass | Local |
| 2026-05-12 | NIPPON DYNAWAVE PACKAGING COMPANY LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2026-03-24 | NIPPON DYNAWAVE PACKAGING COMPANY LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2026-03-18 | HAMPTON LUMBER MILLS-WASHINGTON INC | DARRINGTON, Snohomish, WA | Pass | Local |
| 2026-03-18 | HAMPTON LUMBER MILLS-WASHINGTON INC | DARRINGTON, Snohomish, WA | Pass | Local |
| 2026-03-18 | HAMPTON LUMBER MILLS-WASHINGTON INC | DARRINGTON, Snohomish, WA | Pass | Local |
| 2026-03-18 | HAMPTON LUMBER MILLS-WASHINGTON INC | DARRINGTON, Snohomish, WA | Pass | Local |
| 2026-03-12 | VULCAN METALS CORP | TACOMA, Pierce, WA | Pass | Local |
| 2026-03-06 | PORT TOWNSEND PAPER CORPORATION — high-priority violation on file | PORT TOWNSEND, Jefferson, WA | Pass | State |
| 2026-03-05 | PORT TOWNSEND PAPER CORPORATION — high-priority violation on file | PORT TOWNSEND, Jefferson, WA | Pass | State |
| 2026-03-05 | PORT TOWNSEND PAPER CORPORATION — high-priority violation on file | PORT TOWNSEND, Jefferson, WA | Pass | State |
| 2026-03-04 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2026-03-03 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2026-03-03 | PHILLIPS 66 | FERNDALE, Whatcom, WA | Pass | Local |
| 2026-03-03 | BP WEST COAST PRODUCTS LLC — high-priority violation on file | BLAINE, Whatcom, WA | Pass | Local |
| 2026-03-02 | PORT TOWNSEND PAPER CORPORATION — high-priority violation on file | PORT TOWNSEND, Jefferson, WA | Pass | State |
| 2026-02-26 | TESORO REFINING AND MARKETING COMPANY | ANACORTES, Skagit, WA | Pass | Local |
| 2026-02-25 | TESORO REFINING AND MARKETING COMPANY | ANACORTES, Skagit, WA | Pass | Local |
| 2026-02-24 | TESORO REFINING AND MARKETING COMPANY | ANACORTES, Skagit, WA | Pass | Local |
| 2026-02-24 | CARDINAL FG COMPANY | WINLOCK, Lewis, WA | Pass | Local |
| 2026-02-20 | CEDAR GROVE COMPOST CO | MAPLE VALLEY, King, WA | Pass | Local |
| 2026-02-20 | CEDAR GROVE COMPOST CO | MAPLE VALLEY, King, WA | Pass | Local |
| 2026-02-18 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2026-02-18 | BOISE CASCADE PLYWD | KETTLE FALLS, Stevens, WA | Pass | State |
| 2026-02-17 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2026-02-17 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2026-02-17 | STEELSCAPE, LC | WASHINGTON, Undetermined, WA | Pass | Local |
| 2026-02-13 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2026-02-12 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2026-02-12 | PUGET SOUND ENERGY (WA NATURAL GAS) | CHEHALIS, Lewis, WA | Pass | Local |
| 2026-02-11 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2026-02-11 | PUGET SOUND ENERGY (WA NATURAL GAS) | CHEHALIS, Lewis, WA | Pass | Local |
| 2026-02-10 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2026-02-10 | DYNO BATTERY INC. | SEATTLE, King, WA | Pass | Local |
| 2026-02-10 | DYNO BATTERY INC. | SEATTLE, King, WA | Pass | Local |
| 2026-02-09 | CEDAR GROVE COMPOSTING, INC | EVERETT, Snohomish, WA | Fail | Local |
| 2026-01-28 | AQUATIC CO | YELM, Thurston, WA | Pass | Local |
| 2026-01-28 | GAS TRANSMISSION NORTHWEST, LLC | WASHINGTON, Undetermined, WA | Pass | Local |
| 2026-01-28 | MINT FARM GENERATION, LLC. | LONGVIEW, Cowlitz, WA | Pass | Local |
| 2026-01-21 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2026-01-20 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2026-01-15 | CITY OF VANCOUVER / WESTSIDE WASTEWATER TREATMENT PLANT — high-priority violation on file | VANCOUVER, Clark, WA | Pass | Local |
| 2026-01-14 | PACKAGING CORPORATION OF AMERICA — high-priority violation on file | WALLULA, Walla Walla, WA | Pending | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.