EPA Air · stack tests by state and year
Air-emissions stack tests in Washington, 2025
- 251Stack 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 2025; one facility can appear more than once, because this is a record of what happened rather than a list of places.
Counties in Washington, 2025
- Cowlitz County 79
- Snohomish County 42
- King County 25
- Skagit County 20
- Lewis County 17
- Pierce County 15
- Whatcom County 12
- Jefferson County 12
- Spokane County 6
- Walla Walla County 5
- Grays Harbor County 4
- Grant County 3
Washington, other years
Air-emissions stack tests recorded in Washington, 2025
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2025-08-21 | LANXESS CORPORATION — high-priority violation on file | KALAMA, Cowlitz, WA | Pass | Local |
| 2025-08-20 | PORT TOWNSEND PAPER CORPORATION — high-priority violation on file | PORT TOWNSEND, Jefferson, WA | Pass | State |
| 2025-08-20 | HOLLYFRONTIER PUGET SOUND REFINERY | ANACORTES, Skagit, WA | Fail | Local |
| 2025-08-20 | LANXESS CORPORATION — high-priority violation on file | KALAMA, Cowlitz, WA | Pass | Local |
| 2025-08-19 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-08-19 | PORT TOWNSEND PAPER CORPORATION — high-priority violation on file | PORT TOWNSEND, Jefferson, WA | Pass | State |
| 2025-08-19 | HOLLYFRONTIER PUGET SOUND REFINERY | ANACORTES, Skagit, WA | Pass | Local |
| 2025-08-18 | TESORO REFINING AND MARKETING COMPANY | ANACORTES, Skagit, WA | Pass | Local |
| 2025-08-14 | PUGET SOUND ENERGY FERNDALE | FERNDALE, Whatcom, WA | Pass | Local |
| 2025-08-14 | PUGET SOUND ENERGY FERNDALE | FERNDALE, Whatcom, WA | Pass | Local |
| 2025-08-13 | PACKAGING CORPORATION OF AMERICA — high-priority violation on file | WALLULA, Walla Walla, WA | Fail | State |
| 2025-08-13 | CLARK PUBLIC UTILITIES / RIVER ROAD GENERATING PROJECT | VANCOUVER, Clark, WA | Pass | Local |
| 2025-08-12 | PACKAGING CORPORATION OF AMERICA — high-priority violation on file | WALLULA, Walla Walla, WA | Pass | State |
| 2025-08-05 | CEDAR GROVE COMPOSTING, INC | EVERETT, Snohomish, WA | Fail | Local |
| 2025-07-31 | BP WEST COAST PRODUCTS LLC — high-priority violation on file | BLAINE, Whatcom, WA | Pass | Local |
| 2025-07-30 | TRANSALTA CENTRALIA GENERATION, LLC — high-priority violation on file | CENTRALIA, Lewis, WA | Pass | Local |
| 2025-07-29 | DSHS SPECIAL COMMITMENT CENTER | MCNEIL ISLAND, Pierce, WA | Fail | Local |
| 2025-07-24 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-07-23 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-07-22 | CADMAN INC | GOLD BAR, Snohomish, WA | Pass | Local |
| 2025-07-19 | NUCOR STEEL SEATTLE INC | SEATTLE, King, WA | Pass | Local |
| 2025-07-19 | NUCOR STEEL SEATTLE INC | SEATTLE, King, WA | Pass | Local |
| 2025-07-19 | NUCOR STEEL SEATTLE INC | SEATTLE, King, WA | Pass | Local |
| 2025-07-19 | NUCOR STEEL SEATTLE INC | SEATTLE, King, WA | Pass | Local |
| 2025-07-19 | NUCOR STEEL SEATTLE INC | SEATTLE, King, WA | Pass | Local |
| 2025-07-17 | PORT TOWNSEND PAPER CORPORATION — high-priority violation on file | PORT TOWNSEND, Jefferson, WA | Pass | State |
| 2025-07-15 | PORT TOWNSEND PAPER CORPORATION — high-priority violation on file | PORT TOWNSEND, Jefferson, WA | Pass | State |
| 2025-07-15 | PORT TOWNSEND PAPER CORPORATION — high-priority violation on file | PORT TOWNSEND, Jefferson, WA | Pass | State |
| 2025-07-14 | PORT TOWNSEND PAPER CORPORATION — high-priority violation on file | PORT TOWNSEND, Jefferson, WA | Pass | State |
| 2025-07-11 | NIPPON DYNAWAVE PACKAGING COMPANY LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-07-10 | NIPPON DYNAWAVE PACKAGING COMPANY LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-07-10 | HOLLYFRONTIER PUGET SOUND REFINERY | ANACORTES, Skagit, WA | Pass | Local |
| 2025-07-10 | HOLLYFRONTIER PUGET SOUND REFINERY | ANACORTES, Skagit, WA | Pass | Local |
| 2025-07-09 | NIPPON DYNAWAVE PACKAGING COMPANY LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-07-08 | NIPPON DYNAWAVE PACKAGING COMPANY LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-07-08 | HOLLYFRONTIER PUGET SOUND REFINERY | ANACORTES, Skagit, WA | Pass | Local |
| 2025-06-26 | ARCHAEA ENERGY INC DBA. EMERALD CITY RENEWABLES LLC | GRAHAM, Pierce, WA | Pass | Local |
| 2025-06-25 | LANXESS CORPORATION — high-priority violation on file | KALAMA, Cowlitz, WA | Fail | Local |
| 2025-06-17 | SIERRA PACIFIC INDUSTRIES - SHELTON | SHELTON, Mason, WA | Pending | Local |
| 2025-06-12 | WASTE TO ENERGY | SPOKANE, Spokane, WA | Pass | Local |
| 2025-06-11 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-06-11 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Pass | Local |
| 2025-06-11 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Pass | Local |
| 2025-06-11 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Pass | Local |
| 2025-06-11 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Pass | Local |
| 2025-06-11 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Pass | Local |
| 2025-06-11 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Pass | Local |
| 2025-06-11 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Pass | Local |
| 2025-06-11 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Pass | Local |
| 2025-06-10 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-06-06 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-06-04 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-06-03 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-06-03 | PANELTECH — high-priority violation on file | HOQUIAM, Grays Harbor, WA | Incomplete | Local |
| 2025-06-02 | STONEWAY ROCK & RECYCLING, BLACK RIVER, G MERLINO | RENTON, King, WA | Pass | Local |
| 2025-05-30 | NIPPON DYNAWAVE PACKAGING COMPANY LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-05-30 | TESORO REFINING AND MARKETING COMPANY | ANACORTES, Skagit, WA | Pass | Local |
| 2025-05-29 | NIPPON DYNAWAVE PACKAGING COMPANY LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-05-29 | NIPPON DYNAWAVE PACKAGING COMPANY LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-05-28 | NIPPON DYNAWAVE PACKAGING COMPANY LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-05-22 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-05-21 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-05-20 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-05-08 | ROCKY MOUNTAIN POWER - CHEHALIS POWER GENERATING, L.P. | CHEHALIS, Lewis, WA | Pass | Local |
| 2025-05-07 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-05-07 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-05-07 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-05-07 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-05-07 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-05-07 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-05-07 | ROCKY MOUNTAIN POWER - CHEHALIS POWER GENERATING, L.P. | CHEHALIS, Lewis, WA | Pass | Local |
| 2025-05-06 | PORT TOWNSEND PAPER CORPORATION — high-priority violation on file | PORT TOWNSEND, Jefferson, WA | Pass | State |
| 2025-05-06 | ROCKY MOUNTAIN POWER - CHEHALIS POWER GENERATING, L.P. | CHEHALIS, Lewis, WA | Pass | Local |
| 2025-05-06 | PUGET SOUND ENERGY (WA NATURAL GAS) | CHEHALIS, Lewis, WA | Pass | Local |
| 2025-04-29 | PANELTECH — high-priority violation on file | HOQUIAM, Grays Harbor, WA | Pending | Local |
| 2025-04-23 | GAS TRANSMISSION NORTHWEST #8 | WALLULA, Walla Walla, WA | Pass | State |
| 2025-04-23 | HM PACIFIC NORTHWEST - WOODINVILLE RCM | WOODINVILLE, King, WA | Pass | Local |
| 2025-04-17 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-04-17 | STEELSCAPE, LC | WASHINGTON, Undetermined, WA | Pass | Local |
| 2025-04-16 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-04-16 | PUGET PAVING | PUYALLUP, Pierce, WA | Pass | Local |
| 2025-04-16 | LANXESS CORPORATION — high-priority violation on file | KALAMA, Cowlitz, WA | Pass | Local |
| 2025-04-16 | LANXESS CORPORATION — high-priority violation on file | KALAMA, Cowlitz, WA | Pass | Local |
| 2025-04-04 | VULCAN METALS CORP | TACOMA, Pierce, WA | Pass | Local |
| 2025-04-04 | VULCAN METALS CORP | TACOMA, Pierce, WA | Pass | Local |
| 2025-04-01 | NAVAL BASE KITSAP AT BREMERTON | BREMERTON, Kitsap, WA | Pass | Local |
| 2025-04-01 | BOEING COMMERCIAL AIRPLANE, FREDERICKSON | PUYALLUP, Pierce, WA | Pass | Local |
| 2025-03-31 | NAVAL BASE KITSAP AT BREMERTON | BREMERTON, Kitsap, WA | Pass | Local |
| 2025-03-28 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-03-28 | NIPPON DYNAWAVE PACKAGING COMPANY LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-03-26 | NIPPON DYNAWAVE PACKAGING COMPANY LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-03-25 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-03-25 | NIPPON DYNAWAVE PACKAGING COMPANY LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-03-25 | TRANSALTA CENTRALIA GENERATION, LLC — high-priority violation on file | CENTRALIA, Lewis, WA | Pass | Local |
| 2025-03-20 | HAMPTON LUMBER MILLS-WASHINGTON INC | DARRINGTON, Snohomish, WA | Pass | Local |
| 2025-03-20 | HAMPTON LUMBER MILLS-WASHINGTON INC | DARRINGTON, Snohomish, WA | Pass | Local |
| 2025-03-20 | KAISER ALUMINUM WASHINGTON, LLC | SPOKANE, Spokane, WA | Pass | Local |
| 2025-03-19 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Fail | Local |
| 2025-03-19 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Fail | Local |
| 2025-03-19 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Pass | Local |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.