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  2. Permitting Under the Clean Air Act

Clean Air Act Permitting in Washington

Clean Air Act permitting in Washington is the shared responsibility of EPA Region 10 and the agencies listed below.

Indian Country

Permitting Agency Types of Permits Issued
EPA Region 10
  • Prevention of Significant Deterioration (PSD) construction permits
  • Minor New Source Review (mNSR) construction permits
  • Nonattainment New Source Review (nNSR) construction permits
  • Title V operating permits
  • Non-Title V operating permits

Outer Continental Shelf (more than 3 miles off Washington coastline)

Permitting Agency Types of Permits Issued
EPA Region 10
  • Prevention of Significant Deterioration (PSD) construction permits
  • Minor New Source Review (mNSR) construction permits
  • Nonattainment New Source Review (nNSR) construction permits
  • Title V operating permits

Note: mNSR and nNSR do not apply more than 28 miles off of the coast line.


All Other Areas in Washington

Permitting Agency Types of Permits Issued
Washington Energy Facility Site Evaluation Council (EFSEC)

For energy projects greater than 350 megawatts:

  • Prevention of Significant Deterioration (PSD) construction permits
  • Minor New Source Review (mNSR) construction permits
  • Nonattainment New Source Review (nNSR) construction permits
  • Title V operating permits
Washington Department of Ecology
  • Prevention of Significant Deterioration (PSD) construction permits not under EFSEC jurisdiction (see above)
  • For pulp mills, aluminum mills, and Hanford:
    • Minor New Source Review (mNSR) construction permits
    • Nonattainment New Source Review (nNSR) construction permits
    • Title V operating permits
  • For Adams, Asotin, Chelan, Columbia, Douglas, Ferry, Franklin, Garfield, Grant, Kittitas, Lincoln, Okanogan, Pend Oreille, San Juan, Stevens, Walla Walla and Whitman Counties:
    • Minor New Source Review (mNSR) construction permits
    • Nonattainment New Source Review (nNSR) construction permits
    • Title V operating permits
Benton Clean Air Agency(serving Benton County)
  • Minor New Source Review (mNSR) construction permits
  • Nonattainment New Source Review (nNSR) construction permits
  • Title V operating permits
Olympic Region Clean Air Agency(serving Clallam, Grays Harbor, Jefferson, Mason, Pacific and Thurston Counties)
  • Minor New Source Review (mNSR) construction permits
  • Nonattainment New Source Review (nNSR) construction permits
  • Title V operating permits
Southwest Clean Air Agency (serving Clark, Cowlitz, Lewis, Skamania and Wahkiakum Counties)
  • Minor New Source Review (mNSR) construction permits
  • Nonattainment New Source Review (nNSR) construction permits
  • Title V operating permits
Puget Sound Clean Air Agency (serving King, Kitsap, Pierce and Snohomish Counties)
  • Minor New Source Review (mNSR) construction permits
  • Nonattainment New Source Review (nNSR) construction permits
  • Title V operating permits
Northwest Clean Air Agency (serving Island, Skagit and Whatcom Counties)
  • Minor New Source Review (mNSR) construction permits
  • Nonattainment New Source Review (nNSR) construction permits
  • Title V operating permits
Spokane Regional Clean Air Agency(serving Spokane County)
  • Minor New Source Review (mNSR) construction permits
  • Nonattainment New Source Review (nNSR) construction permits
  • Title V operating permits
Yakima Regional Clean Air Agency (serving Yakima County)
  • Minor New Source Review (mNSR) construction permits
  • Nonattainment New Source Review (nNSR) construction permits
  • Title V operating permits
Washington

Other Region 10 Air Permitting Resources

  • Air permitting in the Pacific Northwest
  • EPA-issued permits
  • Delegations & approvals
  • Permit program reviews
  • Permitting authorities:
    • Alaska
    • Idaho
    • Oregon
    • Washington

National Supporting Resources

  • CAA Permitting Home
  • New Source Review (NSR) Program
  • Title V Program
  • Tribal Permit Program
  • Outer Continental ​Shelf Permit Program
  • CAA Permitting Tools & ​Related Resources
  • Air Permitting Terms
  • Where You Live

Air Permitting Policy & Guidance

  • Search Documents
  • NSR Policy & Guidance
  • Title V Policy & Guidance
  • Title V Petition Database

Permitting Under the Clean Air Act

  • Clean Air Act Permitting Around the Nation
    • New England Region (R1)
    • New York, New Jersey, Puerto Rico and U.S. Virgin Islands (R2)
    • Mid-Atlantic Region (R3)
    • Southeastern Region (R4)
    • Great Lakes Region (R5)
    • South Central Region (R6)
    • Midwest Region (R7)
    • Mountains and Plains Region (R8)
    • Pacific Southwest Region (R9)
      • About PSD Permitting in Region 9
      • Air Permit Delegation and PSD SIP Approval Status in Region 9
      • About NSR Permitting in Region 9
      • About Title V Permitting in Region 9
      • Electronic Permit System and Dashboards
      • Pending and Completed Permit Actions
      • Clean Air Act Permitting in Arizona
      • Clean Air Act Permitting in California
      • Clean Air Act Permitting in Hawai'i and Pacific Islands
      • Clean Air Act Permitting in Nevada
    • Pacific Northwest Region (R10)
  • CAA Permitting Tools & ​Related Resources
  • Outer Continental Shelf Air Permits
Contact Us About Permitting Under the Clean Air Act
Contact Us to ask a question, provide feedback, or report a problem.
Last updated on February 18, 2025
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