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 |
|---|---|---|---|---|
| 2025-12-16 | PACKAGING CORPORATION OF AMERICA — high-priority violation on file | WALLULA, Walla Walla, WA | Fail | State |
| 2025-12-11 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-12-10 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-12-10 | HARDEL MUTUAL PLYWOOD CORPORATION — high-priority violation on file | CHEHALIS, Lewis, WA | Pass | Local |
| 2025-12-09 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-12-09 | HARDEL MUTUAL PLYWOOD CORPORATION — high-priority violation on file | CHEHALIS, Lewis, WA | Pass | Local |
| 2025-12-04 | D&L FOUNDRY & SUPPLY INC | MOSES LAKE, Grant, WA | Pass | State |
| 2025-12-04 | LANXESS CORPORATION — high-priority violation on file | KALAMA, Cowlitz, WA | Pass | Local |
| 2025-11-25 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-11-19 | US ENERGY DEPT - HANFORD — high-priority violation on file | RICHLAND, Benton, WA | Pending | State |
| 2025-11-19 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-11-18 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-11-14 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-11-13 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-11-13 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-11-13 | PACKAGING CORPORATION OF AMERICA — high-priority violation on file | WALLULA, Walla Walla, WA | Pending | State |
| 2025-11-12 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-11-11 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-11-11 | NIPPON DYNAWAVE PACKAGING COMPANY LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-11-06 | KAISER ALUMINUM WASHINGTON, LLC | SPOKANE, Spokane, WA | Pass | Local |
| 2025-11-05 | CEDAR GROVE COMPOSTING, INC | EVERETT, Snohomish, WA | Pass | Local |
| 2025-11-05 | BOEING DEVELOPMENTAL CENTER | TUKWILA, King, WA | Pass | Local |
| 2025-11-04 | BOEING DEVELOPMENTAL CENTER | TUKWILA, King, WA | Pass | Local |
| 2025-11-04 | BOEING DEVELOPMENTAL CENTER | TUKWILA, King, WA | Pass | Local |
| 2025-11-04 | BOEING DEVELOPMENTAL CENTER | TUKWILA, King, WA | Pass | Local |
| 2025-11-04 | TRANSALTA CENTRALIA GENERATION, LLC — high-priority violation on file | CENTRALIA, Lewis, WA | Pass | Local |
| 2025-11-03 | FRANZ SEATTLE DIVISION - WELLER ST. | SEATTLE, King, WA | Pass | Local |
| 2025-10-31 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-10-31 | LANXESS CORPORATION — high-priority violation on file | KALAMA, Cowlitz, WA | Pass | Local |
| 2025-10-30 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-10-30 | KAISER ALUMINUM WASHINGTON, LLC | SPOKANE, Spokane, WA | Fail | Local |
| 2025-10-29 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Fail | State |
| 2025-10-29 | TESORO REFINING AND MARKETING COMPANY | ANACORTES, Skagit, WA | Pass | Local |
| 2025-10-28 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-10-23 | CAPITAL POWER CORPORATION | TACOMA, Pierce, WA | Pass | Local |
| 2025-10-22 | PORT TOWNSEND PAPER CORPORATION — high-priority violation on file | PORT TOWNSEND, Jefferson, WA | Pass | State |
| 2025-10-22 | PUGET SOUND ENERGY (WA NATURAL GAS) | CHEHALIS, Lewis, WA | Pass | Local |
| 2025-10-21 | SIERRA PACIFIC IND.- SKAGIT LUMBER | MOUNT VERNON, Skagit, WA | Pass | Local |
| 2025-10-21 | PUGET SOUND ENERGY (WA NATURAL GAS) | CHEHALIS, Lewis, WA | Pass | Local |
| 2025-10-21 | PUGET SOUND ENERGY (WA NATURAL GAS) | CHEHALIS, Lewis, WA | Pass | Local |
| 2025-10-20 | PUGET SOUND ENERGY (WA NATURAL GAS) | CHEHALIS, Lewis, WA | Pass | Local |
| 2025-10-16 | SIERRA PACIFIC IND.- SKAGIT LUMBER | MOUNT VERNON, Skagit, WA | Pass | Local |
| 2025-10-15 | GUY BENNETT LUMBER | CLARKSTON, Asotin, WA | Pass | State |
| 2025-10-15 | SIERRA PACIFIC IND.- SKAGIT LUMBER | MOUNT VERNON, Skagit, WA | Pass | Local |
| 2025-10-15 | BP WEST COAST PRODUCTS LLC — high-priority violation on file | BLAINE, Whatcom, WA | Pass | Local |
| 2025-10-15 | SIERRA PACIFIC INDUSTRIES - SHELTON | SHELTON, Mason, WA | Pending | Local |
| 2025-10-13 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Pass | Local |
| 2025-10-13 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Pass | Local |
| 2025-10-13 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Fail | Local |
| 2025-10-13 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Pass | Local |
| 2025-10-13 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Pass | Local |
| 2025-10-13 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Fail | Local |
| 2025-10-13 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Fail | Local |
| 2025-10-13 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Fail | Local |
| 2025-10-10 | NORTHWEST PIPELINE GP SUMNER | SUMNER, Pierce, WA | Pass | Local |
| 2025-10-10 | NORTHWEST PIPELINE GP SUMNER | SUMNER, Pierce, WA | Pass | Local |
| 2025-10-08 | NORTHWEST PIPELINE LLC SNOHOMISH | SNOHOMISH, Snohomish, WA | Pass | Local |
| 2025-10-08 | NORTHWEST PIPELINE LLC SNOHOMISH | SNOHOMISH, Snohomish, WA | Pass | Local |
| 2025-10-06 | CEDAR GROVE COMPOST CO | MAPLE VALLEY, King, WA | Pass | Local |
| 2025-10-06 | CEDAR GROVE COMPOST CO | MAPLE VALLEY, King, WA | Pass | Local |
| 2025-10-06 | NORTHSIDE LANDFILL | SPOKANE, Spokane, WA | Pass | Local |
| 2025-10-03 | SIERRA PACIFIC INDUSTRIES - COGENERATION — high-priority violation on file | ABERDEEN, Grays Harbor, WA | Pending | Local |
| 2025-09-23 | CAPITAL POWER CORPORATION | TACOMA, Pierce, WA | Pass | Local |
| 2025-09-23 | CAPITAL POWER CORPORATION | TACOMA, Pierce, WA | Pass | Local |
| 2025-09-23 | CAPITAL POWER CORPORATION | TACOMA, Pierce, WA | Pass | Local |
| 2025-09-23 | CAPITAL POWER CORPORATION | TACOMA, Pierce, WA | Pass | Local |
| 2025-09-18 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-09-18 | CHEMTRADE SOLUTIONS LLC | ANACORTES, Skagit, WA | Pass | Local |
| 2025-09-17 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-09-17 | CHEMTRADE SOLUTIONS LLC | ANACORTES, Skagit, WA | Pass | Local |
| 2025-09-16 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-09-16 | LANXESS CORPORATION — high-priority violation on file | KALAMA, Cowlitz, WA | Pass | Local |
| 2025-09-16 | TRANSALTA CENTRALIA GENERATION, LLC — high-priority violation on file | CENTRALIA, Lewis, WA | Pass | Local |
| 2025-09-11 | KAISER ALUMINUM WASHINGTON, LLC | SPOKANE, Spokane, WA | Pass | Local |
| 2025-09-09 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Pass | Local |
| 2025-09-09 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Pass | Local |
| 2025-09-09 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Pass | Local |
| 2025-09-09 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Pass | Local |
| 2025-09-09 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Pass | Local |
| 2025-09-09 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Pass | Local |
| 2025-09-09 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Pass | Local |
| 2025-09-09 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Pass | Local |
| 2025-09-09 | CARLISLE CONSTRUCTION MATERIALS INCORPORATED | PUYALLUP, Pierce, WA | Pass | Local |
| 2025-09-09 | CARLISLE CONSTRUCTION MATERIALS INCORPORATED | PUYALLUP, Pierce, WA | Pass | Local |
| 2025-09-05 | GRAYS HARBOR ENERGY LLC | ELMA, Grays Harbor, WA | Pending | Local |
| 2025-09-03 | BP WEST COAST PRODUCTS LLC — high-priority violation on file | BLAINE, Whatcom, WA | Pass | Local |
| 2025-09-03 | AEROJET ROCKETDYNE, INC. | REDMOND, King, WA | Pass | Local |
| 2025-09-03 | AEROJET ROCKETDYNE, INC. | REDMOND, King, WA | Pass | Local |
| 2025-08-29 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Incomplete | State |
| 2025-08-28 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Incomplete | State |
| 2025-08-27 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-08-26 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-08-26 | WEYERHAEUSER NR RAYMOND LUMBERMILL | RAYMOND, Pacific, WA | Pass | Local |
| 2025-08-22 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-08-21 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-08-21 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-08-21 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-08-21 | HOLLYFRONTIER PUGET SOUND REFINERY | ANACORTES, Skagit, WA | Pass | Local |
| 2025-08-21 | LANXESS CORPORATION — high-priority violation on file | KALAMA, Cowlitz, WA | Pass | Local |
| 2025-08-21 | LANXESS CORPORATION — high-priority violation on file | KALAMA, Cowlitz, WA | Pass | Local |
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Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.