Washington State Department of HealthShellfish biotoxin closure zones in Puget Sound and Washington coastal areas. The areas also support the Internet biotoxin bulletin applications at https://fortress.wa.gov/doh/biotoxin/biotoxin.html and https://fortress.wa.gov/doh/oswpviewer/index.html This layer is currently being updated hourly if changes have been made by the Office of Shellfish and Water Protection.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/8e4a4886864f44e6bbc0ec871c3382e4_0engState of Washington Geospatial Open Data PortalPublicBiotoxin Closure Zones [Washington (State)]Web servicesWashington (State)Last Modified: 2025-07-10