Environmental (SEPA) Documents

SEPA environmental documents for non-project actions in 2015, 2016, 2017,2018 , 2019, 2020, 2021, and 2022.


Environmental Impact Statement for the 2024 Comprehensive Plan Update 

Supplemental Environmental Impact Statement for the 2015 Comprehensive Plan

Addenda to the Final Environmental Impact Statement for the Critical Area Regulations

  • Addendum 1 (PDF) - Final Environmental Impact Statement of the Critical Area Regulations (Issue date:7/07)
  • Addendum 2 (PDF) - Final Environmental Impact Statement of the Critical Area Regulations (Issue date: 7/2/15)
  • Addendum 3 (PDF) - Final Environmental Impact Statement of the Critical Area Regulations (Issue date: 6/27/17)

Addenda to the Final Environmental Impact Statement  for the 2015 Comprehensive Plan

  • Addendum 1 (PDF) - Amendments to General Policy Plan Related to the Future Land Use Map (Issue date: 12/30/15)
  • Addendum 2 (PDF) - Amendments to General Policy Plan Related to Technical Corrections and Map 6 (Issue date: 4/22/16)
  • Addendum 3 (PDF) - Amendments to General Policy Plan Related to Maps 4 and 5 (Issue date: 4/22/16)
  • Addendum 4 (PDF) - Amendments to General Policy Plan Related to Housing Policies (Issue date: 5/20/16)
  • Addendum 5 (PDF) - Amendments to General Policy Plan Related to Innovative Water Supply (Issue date: 5/20/16)
  • Addendum 6 (PDF) - Amendments to General Policy Plan Related to Rural Urban Transition Area - Future Land Use Map and Policies (Issue date: 5/20/16)
  • Addendum 7 (PDF) - Amendments to Appendix D - Growth Targets, Map 3 - Municipal Urban Growth Area Boundaries, and UGA Land Capacity Analysis (Issue date: 6/24/16)
  • Addendum 8 (PDF) - Creation of a new General Policy Plan Chapter Providing for Tribal Coordination (Issue date: 6/24/16)
  • Addendum 9 (PDF) - 2017-2022 Capital Improvement Program (Issue date: 9/1/16)
  • Addendum 10 (PDF) - Amendments to the General Policy Plan Related to Transportation (Issue date: 5/10/17)
  • Addendum 11 (PDF) - Amendments to the General Policy Plan Related to Final Docket XVIII (Issue date: 5/10/17)
  • Addendum 12 (PDF) - 2018-2023 Capital Improvement Program (Issue date: 9/7/17)
  • Addendum 13 (PDF) - Amendments to the General Policy Plan Related to Final Docket XIX (Issue date: 7/13/18)
  • Addendum 14 (PDF) - Amendments to County Arterial Circulation and Countywide Bicycle Facility System maps (Issue date: 7/13/18)
  • Addendum 15 (PDF) - Amendments to the General Policy Plan Related to Final Docket XIX: Northshore School District (SW4) (Issue date: 7/13/18)
  • Addendum 16 (PDF) - 2019-2024 Capital Improvement Program (Issue Date: 9/7/18)
  • Addendum 17 (PDF) - Adopting Map Correction Amendments to the GPP (Issue Date: 4/5/19)
  • Addendum 18 (PDF) - 2019 County-initiated Amendments to the General Policy Plan (Issue Date: 7/30/19)
  • Addendum 19 (PDF) - 2020-2025 Capital Improvement Program (Issue Date: 09/09/19)
  • Addendum 20 (PDF) - 2020 County-Initiated Amendments to the Snohomish County Growth Management Act (GMA) Comprehensive Plan and Implementing Development Regulations (Issue Date: July 28, 2020) 
  • Addendum 21 (PDF) - 2021-2026 Capital Improvement Program (Issue Date: 09/09/20)
  • Addendum 22 (PDF) - Amendments to the General Policy Plan and Capital Facilities Plan related to Final Docket XX and 2021 county-Initiated Technical Corrections (Issue Date: 06/07/2021) 
  • Addendum 23 (PDF) - Addendum 23 to the Final Environment Impact statement for the Snohomish County Comprehensive Plan 2015 Update Regarding the County’s 2022-2027 Capital Improvement Program (Issue Date: 08/04/2021)
  • Addendum 24 (PDF) -  Amendments to the Snohomish County Comprehensive Plan related to the 2022 County-Initiated Technical Corrections (GPP22-3) (Issue Date: 4/8/2022)
  • Addendum 25 (PDF) - Addendum 25 to the Final Environment Impact statement for the Snohomish County Comprehensive Plan 2015 Update Regarding the County’s 2023-2028 Capital Improvement Program (Issue Date: 07/21/2022)

Environmental Impact Statement for the 2015 Comprehensive Plan

Addenda to the Final Supplemental Environment Impact Statement for VISION 2050

  • Addendum 1 (PDF) - Addendum 1 to the Final Supplemental Environmental Impact Statement for VISION 2050 regarding the 2021 update of the Countywide Planning Policies (Issue Date: 9/13/2021)
  • Addendum 2 (PDF) - Addendum 2 to the Final Supplemental Environmental Impact Statement for VISION 2050 regarding amendments to the Countywide Planning Policies to include the 2044 Initial Population and Employment Growth Targets (Issue Date: 2/14/2022)

Determinations of Nonsignificance (DNS) for Code Projects

To access older environmental documents contact Planning and Development Services at 425-388-3311.