EPA Air · by county
Air-emissions sources in King County, Washington
- 119Facilities
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Every stationary source in King County, Washington that holds a Clean Air Act permit or is otherwise tracked by an air agency — planned, under construction, operating, seasonal or temporarily closed. Sources EPA records as permanently closed are not listed.
Every source’s record in King County
Each of the 117 operating major, synthetic minor and minor sources in King County, Washington has a record page: every source in King County, A to Z.
By emissions classification in King County
A source’s classification is the size band its potential emissions put it in: a major source is large enough to need a Title V operating permit, a synthetic minor has accepted limits to stay below that line, and a minor source sits below it outright.
Inspections in King County, by year
A compliance evaluation is the on-site or file review a state, local or federal air agency records against a permitted source.
- 2026 inspections 266
- 2025 inspections 756
- 2024 inspections 593
- 2023 inspections 659
- 2022 inspections 423
- 2021 inspections 265
- 2020 inspections 366
- 2019 inspections 336
- 2018 inspections 339
- 2017 inspections 350
Stack tests in King County, by year
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
- 2026 stack tests 5
- 2025 stack tests 25
- 2024 stack tests 60
- 2023 stack tests 49
- 2022 stack tests 31
- 2021 stack tests 42
- 2020 stack tests 42
- 2019 stack tests 89
- 2018 stack tests 65
- 2017 stack tests 74
Inspections in King County, year by year · Stack tests in King County, year by year
Other counties in Washington
Every county in the state with at least three sources on file.
- Benton County 9
- Clallam County 8
- Clark County 25
- Cowlitz County 17
- Franklin County 6
- Grant County 12
- Grays Harbor County 19
- Kitsap County 37
- Klickitat County 5
- Lewis County 15
- Mason County 5
- Okanogan County 19
- Pierce County 75
- Skagit County 16
- Snohomish County 65
- Spokane County 25
- Stevens County 5
- Thurston County 5
- Undetermined County 29
Facilities
County as filed on the facility record. Figures from EPA’s ICIS-AIR download.
What this page shows
This page covers Clean Air Act facilities in the EPA air register for King county, WA. It lists 119 facilities and 15 major sources.