Washington State Department of EcologyWashington State's Current (2018) Water Quality Assessment (WQA) is produced in the Environmental Protection Agency's "Integrated Report" format. The WQA consists of both the 303(d) List and the 305(b) Report. The 303(d) List is comprised of only Category 5 listings. The 305(b) Report lists all waters and all categories. The 2018 WQA contains both freshwater and marine listings. EPA approved the 2018 WQA as fulfilling our 2014, 2016, 2018 WQA submittal requirements on August 26, 2022. The WQA is presented on the 1:24k National Hydrography Dataset (NHD).ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/d3c54a3b0044434aa5065e8cbb9d2470_5engState of Washington Geospatial Open Data PortalPublicWater Quality Assessment 305(b) Report (current) [Washington (State)]Web servicesWashington (State)Last Modified: 2024-12-05