Cyanobacteria, also known as blue-green algae, are naturally found in fresh water in the U.S. and in Lake Champlain and other Vermont waters. Some types of cyanobacteria can release natural toxins or poisons (called cyanotoxins) into the water, especially when they die and break down. People and pets should stay away from cyanobacteria blooms. Learn more about cyanobacteria
For information on other monitoring locations and reports from earlier this season, check the Cyanobacteria Tracker Map
Information on lake conditions is provided by a network of volunteers trained and coordinated by the Lake Champlain Committee and by scientists from the Vermont departments of Health and Environmental Conservation. Monitors submit weekly visual observations of water conditions from sites around Lake Champlain.
Weekly Summary of Cyanobacteria Conditions
Below you can find information on where monitors and the public have reported seeing cyanobacteria this week. Everyone, especially people in these areas, should watch for and avoid cyanobacteria.
“Low Alert” means that small amounts of cyanobacteria were observed. “High Alert” means that large amounts of cyanobacteria were observed with dense scums or highly colored water.
It's important to know what cyanobacteria blooms look like so you can stay away from them.
Cyanobacteria Reports Received This Week - Updated September 24, 2021
|SITE NAME||WATERBODY||TOWN||DATE||ALERT LEVEL|
|Crater Club||Lake Champlain||Essex, NY||9/22/2021||Low Alert|
|Carmi DEC01- Central Open Water||Lake Carmi||Franklin||9/22/2021||Low Alert|
|Carmi DEC03- Northeastern Open Water||Lake Carmi||Franklin||9/22/2021||Low Alert|
|Lake Carmi State Park||Lake Carmi||Franklin||9/20/2021||Low Alert|
|Lake Carmi State Park - Area B||Lake Carmi||Franklin||9/20/2021||Low Alert|
|LTM 40||Lake Champlain||St. Albans Town||9/20/2021||Low Alert|
|Newport Marina||Lake Memphremagog||Newport||9/19/2021
If you are interested in becoming a volunteer monitor on Lake Champlain, reach out to the Lake Champlain Committee at firstname.lastname@example.org. If you are interested in monitoring on a different Vermont lake, reach out to Peter Isles at Peter.Isles@vermont.gov.
It's important to know what cyanobacteria look like and to use your best judgment when thinking about swimming or doing other activities in the water. See photos of what cyanobacteria look like and what are not cyanobacteria.
Weekly drinking water test results
All 22 public drinking water suppliers on Lake Champlain submit samples for cyanobacteria toxin analysis. Drinking water test results are updated weekly by the Vermont Department of Environmental Conservation.
Partners in Monitoring Vermont’s Waters
- Lake Champlain Basin Program – funds cyanobacteria monitoring in the Lake Champlain Basin.
- Lake Champlain Committee (LCC) – since 2003, coordinates and trains a group of citizen volunteers to monitor shoreline sites on Lake Champlain in Vermont, New York, and Quebec. You can reach out to LCC if you are interested in becoming a volunteer monitor.
- Vermont Department of Environmental Conservation – monitors long-term water quality at dozens of off-shore stations on Lake Champlain and recruits and trains volunteers on many other Vermont lakes.
- Vermont State Parks – monitors conditions at park swim areas.
to report a bloom:
Report a bloom to the Health Department by filling out this form. Include several photos and note the location of the bloom. (Taking pictures of water is difficult with glare and reflections. Take more pictures than you think you need!)