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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

Areas that Seattle Public Utilities has identified as having problem drainage are also regulated by our floodplain development ordinance.

If you are considering construction on property located in any of these areas, you should consult our regulations before starting the permit process.

Read the Code

Proposed Changes

None

What Do You Want To Do?


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