King County Dept of Information Technology, GIS CenterPolygons depict time of travel estimates for active public drinking water supplies. Source location data were obtained from the Washington State Department of Health, Office of Drinking Water.ArcGIS DynamicMapLayerhttps://hub.arcgis.com/datasets/90508f78e17948d99869cfac96d9744a_3019engPublicWellhead Protection Areas - 1 Year Time of Travel / kcwhpa 1yr wadoh area [Washington (State)--King County]Web servicesWashington (State)--King CountyWashington (State)Last Modified: 2025-11-21