Conditions shown on the map are based on the most recent report available.
This map shows the most recent conditions that have been reported from monitored locations. Widespread monitoring typically ends in September. For current conditions at a swimming area, contact the town, Vermont State Park, or private association responsible for maintaining that area.
Learn what blooms look like so you can avoid them.
Watch a video of what cyanobacteria blooms look like here.
What are Cyanobacteria?
Cyanobacteria, also known as blue-green algae, are a natural component of marine and fresh water ecosystems. Under certain conditions, cyanobacteria multiply quickly, creating blooms. Some blooms produce toxins which can make people and pets sick. Learn more about cyanobacteria (blue-green algae).