King CountyFor more information about this layer please see the GIS Data Catalog . This data shows all the outfall discharge locations including following categories: (Emergency Bypass, Storm, Treated Discharge, CSO). CSO category is created by DSN (for NPDES permit . Last Updated CSO names on Jan 2021.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/76c2d801498f48c6875d6ff2d31c50cf_0engKing County GIS Open DataPublicCombined Sewer Outfall Locations (CSO) [Washington (State)--King County]Web servicesWashington (State)--King CountyWashington (State)Last Modified: 2025-08-07