Stormwater Management Plan
Federally required plans are part of our work to protect stormwater quality. The City of Seattle Stormwater Management Plan complies with the Washington State Department of Ecology issued 2019 National Pollutant Discharge Elimination System (NPDES) Phase I Municipal Stormwater Permit. The Plan:
- Protect water quality
- Reduces the discharge of pollutants
- Satisfies requirements of the Clean Water Act
- Meets state requirements
Our current annual report and attachments, including the current Stormwater Management Plan, all documents in PDF format:
- City of Seattle 2022 NPDES Phase I Annual Report Form
- 2023 Stormwater Management Plan
- Question #5a - Known Stormwater Outfalls
- Question #43a - Appendix 12, Structural Stormwater Controls Table
- Question #46 - Summary of Source Control Program Actions
- Question #47 - Source Control Business Inspection List
- Question #58 - WQIDDE Illicit Discharge Data
- Question #78 - Education & Outreach, General Awareness Programs
- Question #83a - Education & Outreach, Stewardship Report
- Question #102a - Actions Taken Pursuant to S4F
If you would like to comment or have questions about the 2022 Annual Report or 2023 Stormwater Management Plan, please email SWMP@seattle.gov.
Archived Reports
The additional documents below contain the City of Seattle's Annual Report and attachments, as well as the Stormwater Management Plan, since 2007. All documents in PDF format.
2021 Report
- City of Seattle 2021 NPDES Phase I Annual Report Form
- 2022 Stormwater Management Plan
- Question #5a - Known Stormwater Outfalls
- Question #29 - Stormwater Capital Projects
- Question #43a - Appendix 12, Structural Stormwater Controls Table
- Question #46 - Summary of Source Control Program Actions
- Question #47 - Source Control Business Inspection List
- Question #58 - WQIDDE Illicit Discharge Data
- Question #78 - Education & Outreach, General Awareness Programs
- Question #80 - Education & Outreach, Behavior Change Campaign Strategy
- Question #83a - Education & Outreach, Stewardship Report
- Question #102a - Actions Taken Pursuant to S4F
2020 Report
- City of Seattle 2020 NPDES Phase I Annual Report Form
- 2021 Stormwater Management Plan
- Question #5a - Known Stormwater Outfalls
- Question #29 - Stormwater Capital Projects
- Question #43a - Appendix 12, Structural Stormwater Controls Table
- Question #46 - Summary of Source Control Program Actions
- Question #47 - Source Control Business Inspection List
- Question #58 - WQIDDE Illicit Discharge Data
- Question #78 - Education & Outreach, General Awareness Programs
- Question #80 - Education & Outreach, Behavior Change Campaign Strategy
- Question #83a - Education & Outreach, Stewardship Report
- Question #102a - Actions Taken Pursuant to S4F
2019 Report
- City of Seattle 2019 NPDES Phase I Annual Report Form
- 2020 Stormwater Management Plan
- Question #43a - Appendix 12, Structural Stormwater Controls Table
- Question #46 - Summary of Source Control Program Actions
- Question #47 - Source Control Business Inspection List
- Question #58 - WQIDDE Illicit Discharge Data
- Question #77 and #83 - Education and Outreach
- Question #102a - Actions Taken Pursuant to S4F_2019
2018 Report
- City of Seattle 2018 NPDES Phase I Annual Report Form
- 2019 Stormwater Management Plan
- Question #13 Attachment – Public Participation
- Question #34b Attachment – Appendix 11
- Question #36 Attachment – Summary of Source Control Program Actions
- Question #40b Attachment – Citation of field screening methodology
- Question #48 Attachment – IDDE Actions
- Question #67 Attachment – Public Education & Outreach
- Question #72 Attachment – Stormwater Monitoring or Stormwater-related Studies
- Question #90b Attachment – Actions Taken Pursuant to S4F.3.D
2017 Report
- City of Seattle 2017 NPDES Phase I Annual Report Form
- View 2018 Stormwater Management Plan
- View Question #13 Attachment – Public Participation
- View Question #34b Attachment – Appendix 11
- View Question #36 Attachment – Summary of Source Control Program Actions
- View Question #40b Attachment – Citation of field screening methodology
- View Question #48 Attachment – IDDE Actions
- View Question #67 Attachment – Public Education & Outreach
- View Question #72 Attachment – Stormwater Monitoring or Stormwater-related Studies
- View Question #84 Attachment – Street Sweeping Effectiveness Final Report
- View Question #90b Attachment – Actions Taken Pursuant to S4F_2017
- View Question #92b Attachment – G20 Notification
2016 Report
- City of Seattle 2016 NPDES Phase I Annual Report Form
- View 2017 Stormwater Management Plan
- View Question #13 Attachment – Public Participation
- View Question #34b Attachment – Appendix 11
- View Question #36 Attachment – Summary of Source Control Program Actions
- View Question #40b Attachment – Citation of field screening methodology
- View Question #48 Attachment – IDDE Actions
- View Question #55 Attachment – New Frequency for Stormwater Facilities
- View Question #67 Attachment – Public Education & Outreach
- View Question #69b Attachment – T4N Behavior Survey
- View Question #72 Attachment – Stormwater Monitoring or Stormwater-related Studies
- View Question #84 Attachment – Street Sweep Effectiveness Report
- View Question #90b Attachment – Actions Taken Pursuant to S4F_2016
2015 Report
- City of Seattle 2015 NPDES Phase I Annual Report Form
- View 2016 Stormwater Management Plan
- View Question #13 Attachment - Public Participation
- View Question #30 Attachment - LID Review
- View Question #34b Attachment - Appendix 11
- View Question #36 Attachment - Summary of Source Control Program Actions
- View Question #40b Attachment - 2014 IDDE QAPP
- View Question #48 Attachment - IDDE Actions
- View Question #67 Attachment – Public Education and Outreach Efforts
- View Question #72 Attachment – Stormwater Monitoring or Stormwater-related Studies
- View Question #84 Attachment – 2014 Stormwater Monitoring Report
- View Question # 90b Attachment – Actions Taken Pursuant to S4F
2014 Report
- City of Seattle 2014 NPDES Phase I Annual Report Form
- View 2015 Stormwater Management Plan
- View Attachments
2013 Report
2012 Report
- City of Seattle 2012 NPDES Phase I Annual Report Form
- View 2012 Stormwater Management Plan
- 2012 Attachment B, Program Evaluation and Other Activities Narrative
- 2012 Attachment C, WY2012 Monitoring Report
2011 Reports
- City of Seattle 2011 NPDES Phase I Annual Report Form
- View 2011 Stormwater Management Plan
- 2011 Attachment B, Program Evaluation and Other Activities Narrative
- 2011 Attachment C, WY2011 Monitoring Report
- Street Sweeping for Water Quality Program Effectiveness Report (S8.E)
- Catch Basin StormFilter BMP Monitoring (S8.F) Report
2010 Reports
- City of Seattle 2010 NPDES Phase I Annual Report Form
- View 2010 Stormwater Management Plan
- 2010 Attachment B, Program Evaluation and Other Activities Narrative
- 2010 Attachment C, WY2010 Monitoring Report
2009 Reports
- City of Seattle 2009 NPDES Phase I Annual Report Form
- View 2009 Stormwater Management Plan
- 2009 Attachment B, Program Evaluation and Other Activities Narrative
- 2009 Attachment C, WY2009 Monitoring Report
2008 Reports
- City of Seattle 2008 NPDES Phase I Annual Report Form
- View 2008 Stormwater Management Plan
- 2008 Attachment B, Program Evaluation and Other Activities Narrative
2007 Reports
- City of Seattle 2007 NPDES Phase I Annual Report Form
- View 2007 Stormwater Management Plan
- 2007 Attachment B, Program Evaluation and Other Activities Narrative
Additional Resources
- Washington Department of Ecology (Copy of Phase I Municipal Stormwater Permit)
- Environmental Protection Agency (Information on the NPDES Stormwater Program)