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FEMA is updating flood maps throughout King County based on new data about flood hazards. This is the first update in many years and is an important opportunity for our region to get a better and more accurate assessment of the flood hazards we face.

If you have questions about the flood map updates, please contact the River and Floodplain Management Section at 206-477-4727. If you’d like to view an interactive map of the preliminary flood maps, you can view that here.

If you would like to have a flood map of your specific property to bring to the meetings, please email and it will be emailed to you. Please include your full name, full property address, parcel number (if available), contact information (including mailing address, email address, and phone number), and questions or specific requests.

Staff from the River and Floodplain Management Section can assist with the following flood map information by calling 206-477-4727.

  • Confirming if a property is located within a FEMA mapped Special Flood Hazard Area (SFHA), or flood prone area identified by King County.
  • Provide flood insurance rating information such as FIRM zone, panel number, suffix, panel date and index date.
  • Provide FEMA elevation certificates if available. King County has elevation certificates for many properties within the SFHA.
  • Determine what regulatory provisions may apply to a specific property.
  • If available, provide information on past flood damage to a property.

King County Code >> Critical Areas (Acrobat PDF format) 
County definitions and rules on development standards, restrictions, and requirements as well as permitted uses in King County floodplains and other sensitive areas. Codes pertaining specifically to floodplains can be found under sections 21A.24.230 to 21A.24.275 of this document.

Flood map information for realtors, lenders and insurance agents

iMap floodplain boundaries
Navigate, view and print custom maps using King County data including parcels, floodway and floodplain boundaries.

FEMA Flood Map Service Center (external link)
The official online location to find all flood hazard mapping products created under the National Flood Insurance Program (NFIP).

For questions about the floodplain mapping, please contact Ken Zweig, Project Manager, River and Floodplain Management Section.