King CountyFor more information about this layer please see the GIS Data Catalog . Inventory of all stormwater flow control, water quality, and regional stormwater facilities that are inspected or maintained by King County. The layer displays the boundary of the facility based on assets that are included within the facility.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/2ec439a62f6f461d880fa734e747c10b_0engKing County GIS Open DataPublicStormwater Facilities [Washington (State)--King County]Web servicesWashington (State)--King CountyWashington (State)Last Modified: 2026-01-08