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 |
|---|---|---|---|---|
| 2025-03-19 | HAMPTON LUMBER MILLS-WASHINGTON INC | DARRINGTON, Snohomish, WA | Pass | Local |
| 2025-03-19 | HAMPTON LUMBER MILLS-WASHINGTON INC | DARRINGTON, Snohomish, WA | Pass | Local |
| 2025-03-19 | HAMPTON LUMBER MILLS-WASHINGTON INC | DARRINGTON, Snohomish, WA | Pass | Local |
| 2025-03-19 | HAMPTON LUMBER MILLS-WASHINGTON INC | DARRINGTON, Snohomish, WA | Pass | Local |
| 2025-03-18 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Pass | Local |
| 2025-03-18 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Fail | Local |
| 2025-03-18 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Pass | Local |
| 2025-03-18 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Pass | Local |
| 2025-03-13 | PHILLIPS 66 | FERNDALE, Whatcom, WA | Pass | Local |
| 2025-03-12 | SGL COMPOSITES LLC | MOSES LAKE, Grant, WA | Pass | State |
| 2025-03-12 | AQUATIC CO | YELM, Thurston, WA | Fail | Local |
| 2025-03-11 | PHILLIPS 66 | FERNDALE, Whatcom, WA | Pass | Local |
| 2025-03-11 | FRANZ SEATTLE DIVISION - WELLER ST. | SEATTLE, King, WA | Pass | Local |
| 2025-03-06 | TESORO REFINING AND MARKETING COMPANY | ANACORTES, Skagit, WA | Pass | Local |
| 2025-03-06 | BP WEST COAST PRODUCTS LLC — high-priority violation on file | BLAINE, Whatcom, WA | Pass | Local |
| 2025-03-03 | PHILLIPS 66 | FERNDALE, Whatcom, WA | Pass | Local |
| 2025-02-28 | TESORO REFINING AND MARKETING COMPANY | ANACORTES, Skagit, WA | Pass | Local |
| 2025-02-21 | PORT TOWNSEND PAPER CORPORATION — high-priority violation on file | PORT TOWNSEND, Jefferson, WA | Pass | State |
| 2025-02-20 | BP WEST COAST PRODUCTS LLC — high-priority violation on file | BLAINE, Whatcom, WA | Pass | Local |
| 2025-02-19 | BP WEST COAST PRODUCTS LLC — high-priority violation on file | BLAINE, Whatcom, WA | Pass | Local |
| 2025-02-18 | HAMPTON LUMBER MILLS - MORTON | MORTON, Lewis, WA | Pass | Local |
| 2025-02-13 | BP WEST COAST PRODUCTS LLC — high-priority violation on file | BLAINE, Whatcom, WA | Pass | Local |
| 2025-02-12 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-02-12 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-02-12 | PORT TOWNSEND PAPER CORPORATION — high-priority violation on file | PORT TOWNSEND, Jefferson, WA | Pass | State |
| 2025-02-11 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-02-11 | PORT TOWNSEND PAPER CORPORATION — high-priority violation on file | PORT TOWNSEND, Jefferson, WA | Pass | State |
| 2025-02-10 | PORT TOWNSEND PAPER CORPORATION — high-priority violation on file | PORT TOWNSEND, Jefferson, WA | Pass | State |
| 2025-02-07 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-02-07 | TESORO REFINING AND MARKETING COMPANY | ANACORTES, Skagit, WA | Pass | Local |
| 2025-02-06 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-02-06 | DYNO BATTERY INC. | SEATTLE, King, WA | Pass | Local |
| 2025-02-06 | DYNO BATTERY INC. | SEATTLE, King, WA | Pass | Local |
| 2025-02-05 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-02-04 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-02-03 | CEDAR GROVE COMPOST CO | MAPLE VALLEY, King, WA | Fail | Local |
| 2025-02-03 | CEDAR GROVE COMPOST CO | MAPLE VALLEY, King, WA | Fail | Local |
| 2025-01-30 | HARDEL MUTUAL PLYWOOD CORPORATION — high-priority violation on file | CHEHALIS, Lewis, WA | Pass | Local |
| 2025-01-22 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-01-22 | TESORO REFINING AND MARKETING COMPANY | ANACORTES, Skagit, WA | Pass | Local |
| 2025-01-22 | KING COUNTY WASTEWATER TREATMENT DIVISION WEST POINT TREATMENT PLANT | SEATTLE, King, WA | Pass | Local |
| 2025-01-22 | MINT FARM GENERATION, LLC. | LONGVIEW, Cowlitz, WA | Pass | Local |
| 2025-01-21 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-01-21 | GAS TRANSMISSION NORTHWEST #7 | WASHINGTON, Undetermined, WA | Pass | State |
| 2025-01-20 | KING COUNTY WASTEWATER TREATMENT DIVISION WEST POINT TREATMENT PLANT | SEATTLE, King, WA | Pass | Local |
| 2025-01-20 | KING COUNTY WASTEWATER TREATMENT DIVISION WEST POINT TREATMENT PLANT | SEATTLE, King, WA | Pass | Local |
| 2025-01-16 | PUGET SOUND ENERGY-FREDONIA | MOUNT VERNON, Skagit, WA | Pass | Local |
| 2025-01-15 | D&L FOUNDRY & SUPPLY INC | MOSES LAKE, Grant, WA | Pending | State |
| 2025-01-15 | TRANSALTA CENTRALIA GENERATION, LLC — high-priority violation on file | CENTRALIA, Lewis, WA | Pass | Local |
| 2025-01-14 | PUGET SOUND ENERGY-FREDONIA | MOUNT VERNON, Skagit, WA | Pass | Local |
| 2025-01-07 | CPM DEVELOPMENT CORPORATION (DBA ICON MATERIALS) #2604 | SEATTLE, King, WA | Pass | Local |
PreviousPage 2Page 3 of 3
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.