Washington State Department of HealthIdentifies all group a and b public water systems in WA. System status can be active, inactive, pre-active and no longer exists.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/a0d5c9ac32e2464ea2632b83a1e05351_0engState of Washington Geospatial Open Data PortalPublicDrinking Water Systems [Washington (State)]Web servicesWashington (State)Last Modified: 2026-01-05