King CountyFor more information about this layer please see the GIS Data Catalog . King County Wastewater Treatment Service Area - areas contributing flow to King County treatment plantsArcGIS DynamicMapLayerhttps://hub.arcgis.com/datasets/7da451dd786c4e05a75f568483f87880_2478engPublicWastewater Service Area: Includes All Water Bodies / wtdserv all area [Washington (State)--King County]Web servicesWashington (State)--King CountyWashington (State)Last Modified: 2025-11-21