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

Determination of Significance and Request for Comments on Scope of Environmental Impact Statement (EIS) - Snohomish County 2024 Comprehensive Plan Update (Issue Date: 11/01/2021)
Draft Environmental Impact Statement (DEIS) by chapter: (Issued Date: 09/06/2023)
- Cover and Front Matter
- Chapter 1 - Summary
- Chapter 2 - Proposal and Alternatives
- Chapter 3.1 - Natural Environment
- Chapter 3.2 - Built Environment
- Chapter 4 - References
- Chapter 5 - Appendices (Large file, approx. 650MB, may take a while to download

Download the full Draft Environmental Impact Statement (DEIS) (Large file, approx. 700MB, may take a while to download)

Supplemental Environmental Impact Statement for the 2015 Comprehensive Plan

Draft Supplemental Environment Impact Statement (PDF) - Amendments to the General Policy Plan Related to Final Docket XX (Issue date: 6/7/21)
Final Supplemental Environmental Impact Statement (PDF) - Amendments to the General Policy Plan Related to Final Docket XX - Winde (SW6) (Issue date: 9/27/2021)

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)
Addendum 26 (PDF) - Addendum 26 to the Final Environment Impact statement for the Snohomish County Comprehensive Plan 2015 Update Regarding the County’s 2024-2029 Capital Improvement Program (Issue Date: 08/03/2023)

Environmental Impact Statement for the 2015 Comprehensive Plan

Draft Environmental Impact Statement
- Volume I (PDF)
- Volume II (PDF)
Final Environmental Impact Statement (PDF)
- Volume I (PDF)
- Volume I Appendix (PDF)
- Volume II (PDF)

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)
Addendum 3 (PDF) - Addendum 3 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: 7/12/2023)

Determinations of Nonsignificance (DNS) for Code Projects /DocumentCenter/View/80815

Relating to Rural Village Housing Demonstration Program (Issue Date: 03/07/2023)
Relating to County Initiated Areawide Rezones (Issue Date: 02/07/2023)
Relating to Building Measurement and Daylight Basements (Issue Date: 12/05/2022)
Relating to Building Separation for One-Story and Two-Story Buildings (Issue Date: 12/05/2022)
Density Fringe Regulation Amendments (Issue Date 11/30/2022)
Regulations Relating to Marijuana Retail Facilities (Issue Date: 11/18/2022)
Rural Cluster Subdivision Code Amendments (Issue Date: 10/10/2022)
Regulations Related to Residential Development and SEPA Exemption Thresholds (Issue Date: 8/1/2022)
Relating to Flood Hazard Areas Code Correction (Issue Date: 6/8/2022)
Relating to Development Application and Permit Expiration Extensions (Issue Date: 6/8/2022)
Missing Middle and Housing Preservation (Issue Date: 3/31/2022)
Relating to Appeal Hearing Notice Requirements for Type 1 and Type 2 Permits (Issue Date: 2/3/2022)
Relating to Subdivisions and Short Subdivisions (Issue Date: 2/3/2022)
Urban Center Design Review Board (Issue Date: 12/13/2021)
Residential Development in the Business Park Zone (Issue Date: 11/29/2021)
Roads and Access Regulations (Issue Date: 10/6/21)
Mineral Resouce Land Use Policies and Development Regulations (Issue Date: 8/30/21)
International Code Project (I-Codes) - Building Residential Code (Issue Date: 4/9/21)
International Code Project (I-Codes) - Fire Code (Issue Date: 4/9/21)
International Code Project (I-Codes) - Plumbing Mechanical (Issue Date: 4/9/21)
NPDES Determination of Nonsignificance (Issue Date: 4/9/21)
Accessory Dwelling Units (Issue Date: 3/29/21)
- Addendum 1 - Accessory Dwelling Units (PDF) (Issue Date: 5/25/2021)
- Addendum 2 - Accessory Dwelling Units (PDF) (Issue Date: 1/13/2022)
Establishing a Definition for "Started Construction" (Issue Date: 12/3/20)
Minor Revisions to Conditional Use Permits (Issue Date: 11/9/20)
Lot Coverage (Issue Date: 10/30/20)
Revising Farm Worker Dwelling and Wedding Facility Requirements in Certain Rural and Resource Zones (Issue Date: 10/26/20)
Special Flood Hazard Areas (Issue Date: 10/8/20)
Flood Insurance Rate Map (Issue Date: 5/4/20)
Clearview Digital Signs (Issue Date: 7/17/19)
Planned Residential Development (Issue Date: 4/10/19)
Lot Size Averaging (Issue Date: 4/10/19)
Erosion Hazard Area Provisions (Issue Date: 2/14/19)
Rezone Decision Criteria (Issue Date: 2/8/19)
Ground Disturbance Provisions (Issue Date: 9/12/18)
Revising Regulation for Religious Facilities in Rural Business Zones (PDF) (Issue date: 8/27/18)
Revising Regulations Related to the Transfer of Development Rights (PDF) (Issue date: 7/18/18)
Amending policy DP-3 of the Countywide Planning Policies (PDF) (Issue date: 3/14/18)
Prohibiting Supervised Drug Consumption Facilities (PDF) (Issue date: 2/14/18)
Multifamily Residential Code Amendments (PDF) (Issue date: 2/15/18)
Commercial Vehicle Home Basing (PDF) (Issue date: 2/8/18)
Personal Wireless Service Facilities (PDF) (Issue date: 9/7/17)
NPDES Amendments 2017 (PDF) (Issue date: 8/28/17)
Pedestrian Facilities (PDF) (Issue date: 6/28/17)
Urban Residential Development Regulations (PDF) (Issue date: 5/10/17)
Revising Regulations for Retail Marijuana Businesses (PDF) (Issue date: 1/25/17)
Adopting the 2015 Edition of the International Building Code and International Residential Code (Issue date: 10/10/16)
Adopting the 2015 Edition of the International Fire Code (PDF) (Issue date: 10/10/16)
Adopting the 2015 Edition of the International Mechanical Code, Energy Code, and Plumbing Code (PDF) (Issue date: 10/10/16)
Revising Regulations for Marijuana Businesses (PDF) (Issue date: 4/21/16)
Revising Regulations for Marijuana Businesses (PDF) (Issue date: 4/1/16)
Duplexes in Urban Growth Areas (PDF)(Issue date: 2/11/16)
- Addendum 1 - Duplexes (PDF) (Issue date: 8/11/16)
Cottage Housing Regulations (PDF) (Issue date: 2/9/16)
Commercial and Industrial Development (PDF)(Issue date: 11/16/15)
- Addendum 1 - Commercial and Industrial Standards (Issue date: 10/31/16)
NPDES Reissue (PDF) (Issue date: 10/16/15)
Revision to Lot Size Averaging Requirements (PDF) (Issue date: 7/24/15)
Revision to Regulations Pertaining to State Environmental Policy Act (PDF) (Issue date: 7/21/15)
Transfer of Development Rights Interim Regulations (PDF) (Issue date: 7/21/15)
Rural Craft Breweries/Distilleries/Wineries (PDF)(Issue date: 7/14/15)
- Addendum 1 - Rural Craft Breweries/Distilleries/Wineries (PDF) (Issue date: 4/22/16)
Archaeological and Historic Resources (PDF) (Issue date: 3/13/15)
Airport Compatibility (PDF) (Issue date: 3/11/15)
Adopting Regulations for Forest Practices (PDF) (Issue date: 2/6/15)
Revising Regulations for Marijuana Businesses (PDF) (Issue date: 1/15/15)

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