Resources Waterborne Hazards Program Outreach Materials Brochures Coastal Beach Monitoring Safely Enjoy Natural Waters (en Español) Harmful Algal Blooms and other Organisms of Concern in Coastal Waters Cyanobacteria (Blue-Green Algae) Water Illness & Injury Prevention for Watermen and Fish-Handlers Fact Sheets Algal Mat Alert Lake Gaston & Microsiera (Lyngbya) wollei Algal Blooms: Information for Virginia’s Working Waterfront Last Updated: May 11, 2026