Seymour Pond Cyanobacteria Update

On July 30, 2021,  the Cyanobacteria Advisory postings at Seymour Pond were REMOVED at the neighborhood association landings after two weeks of monitoring and water sampling.  The Cyanobacteria and associated toxin levels have dropped to a low risk level for swimming and other recreational water activities.  The Association for the Preservation of Cape Cod ( and the Brewster Ponds Coalition ( continue to monitor our freshwater ponds in Brewster to provide timely notification to our residents of potentially harmful algal blooms.   For additional information,  please visit