Updating Stormwater Regulations - Project Documents
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What & Why
We're working on our 2021 Stormwater Code and Manual Update.
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Get Involved
We're working on our 2021 Stormwater Code and Manual Update.
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Project Documents
We're working on our 2021 Stormwater Code and Manual Update.
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Background
We're working on our 2021 Stormwater Code and Manual Update.
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Timeline
We're working on our 2021 Stormwater Code and Manual Update.
Project Documents
Draft Documents for Public Review #3 - January 11 through February 19, 2021
- Summary of Changes
- Draft 2021 Stormwater Code
- Seattle Municipal Code (Chapters 22.800 - 22.808)
- Related Code and Director's Rules
- New Draft SPU Public Drainage System Director's Rule (includes Storm Mainline Extension rules and the Public Drainage System design requirements that are currently in SPU CAM 1180)
- New Draft Grading Code Revisions (SMC Subtitle IB Chapter 22.170)
- New Draft Land Use Code Revisions
- Draft 2021 Stormwater Manual (Joint SPU/SDCI Director's Rule)
- Volume 1- Project Minimum Requirements
- Volume 2- Construction Stormwater Control
- Volume 3- Project Stormwater Control
- Volume 4- Source Control
- Volume 5- Enforcement (no change at this time)
- Appendix A- Definitions (no change at this time)
- Appendix B- Additional Submittal Requirements
- Appendix C- On-site Stormwater Management BMP Infeasibility Criteria
- Appendix D- Subsurface Characterization and Infiltration Testing for Infiltration BMPs
- Appendix E- Additional Design Requirements and Plant Lists
- Appendix F- Hydrologic Analysis and Design
- Appendix G- Stormwater Control Operations and Maintenance Requirements
- Appendix H- Financial Infeasibility Documentation for Vegetated Roofs and Rainwater Harvesting
- Appendix I- Integrated Pest Management Plan
If you wish to submit a comment, please complete the comment template and email it to SPUStormwaterCodeRev@seattle.gov or mail your comments to:
Sherell Ehlers
Seattle Public Utilities
700 Fifth Ave, Suite 4400
PO Box 34018
Seattle, WA 98124-4018
Email correspondence is preferred.
Note: The actual Stormwater Code and Manual changes are still to be determined. However, our regulations must be equivalent to Ecology's NPDES 2019 Stormwater Permit (Ecology Permit).
SEPA Determination of Non-Significance December 10-24, 2020
We have conducted a State Environmental Protection Act (SEPA) environmental review of the City of Seattle's proposed 2021 Stormwater Code and Rule Update. The lead agency, Seattle Public Utilities (SPU), has issued a Determination of Non-Significance (DNS). This proposal involves the adoption of ordinances amending the City of Seattle's Stormwater Code and associated Directors' Rule.
- SEPA Environmental Checklist for the City of Seattle 2021 Stormwater Code and Rule Update
- Determination of Non-Significance (DNS)
You can see all of the documents related to the SEPA review and DNS listed under the headings below.
Draft Documents for Public Review #2 - November 2 - November 20, 2020
- Summary of Changes
- Draft Stormwater Code
- Seattle Municipal Code(Chapters 22.800 - 22.808)
- Draft Stormwater Manual (Joint SPU/SDCI Director's Rule)
- Volume 1 - Project Minimum Requirements
- Appendix B - Additional Submittal Requirements
- Appendix I - Landscape Management Plan and Integrated Pest Management
Draft Documents for Public Review #1 - April 1 through May 16 20, 2020
These documents were posted for the review period of April 1 through May 16 2020.
- Summary of Changes
- Draft Stormwater Code
- Seattle Municipal Code(Chapters 22.800 - 22.808)
- Draft Stormwater Manual (Joint SPU/SDCI Director's Rule)
- Volume 1 - Project Minimum Requirements
- Volume 2 - Construction Stormwater Control
- Volume 3 - Project Stormwater Control
- Volume 4 - Source Control
- Volume 5 - Enforcement (no change at this time)
- Appendix A - Definitions (no change at this time)
- Appendix B +- Chemical Treatment (to be retired)
- Appendix C - On-site Stormwater Management BMP Infeasibility Criteria
- Appendix D - Subsurface Characterization and Infiltration Testing for Infiltration BMPs
- Appendix E - Additional Design Requirements and Plant Lists
- Appendix F - Hydrologic Analysis and Design
- Appendix G - Stormwater Control Operations and Maintenance Requirements
- Appendix H - Financial Infeasibility Documentation for Vegetated Roofs and Rainwater Harvesting
- Appendix I - Integrated Pest Management Plan
- Draft Stormwater Manual Figures