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Floodplain Development Code

What Is It?

Our floodplain development ordinance has standards and restrictions for construction and development in designated flood hazard areas in the city. Areas affected by the regulations are located within the designated 100-year floodplain along the:

  • Thornton, Pipers, and Longfellow Creeks
  • Duwamish Waterway in the South Park area
  • Puget Sound coastline

If you are considering construction on property located in the designated areas, you should consult our regulations, found in the Seattle Municipal Code (SMC),  before starting the permit process.

Read the Code

Proposed Changes


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  • Call us at (206) 684-8850