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Cyanobacteria in Vermont

Cyanobacteria (also known as blue-green algae) are common native algae in lakes, ponds and rivers around the world.  In Vermont, they can be found in any water body or river.  Some species of cyanobacteria produce toxins and these toxins have been documented in some Vermont lakes.   Not all algae blooms include cyanobacteria and cyanobacteria aren’t always toxic. 

We can all safely swim, fish, and boat in Vermont’s lakes and ponds if we learn to recognize these algae.  The information here will help you know when it is best to find another place for your family or pets to enjoy the water.

Play it safe – learn to recognize and avoid these algae

To report a cyanobacteria bloom, call

1-800-439-8550 (the VT. Dept of Health)


(802) 490-6130 (the Watershed Management Division)


What should you know about cyanobacteria?


What to do

What should you do if you see a bloom?



What causes blooms

What causes cyanobacteria blooms?


Learn more Learn More

Quick Links

Current algae conditions- VT Dept of Health

Cyanobacteria Guidance for Vermont Communities (pdf, 893KB)

Photo Gallery

Health Department, Blue-Green Algae Facts (pdf, 483KB)

Cyanobacteria in Vermont Fact Sheet

What Veterinarians Should Know (pdf, 181KB)


Lake Champlain Cyanobacteria Monitoring


Quality Assurance Project Plan (pdf, 4.8MB)

2014 Annual Report (pdf, 3.8MB)

Find older reports here, title search“cyanobacteria”

Sign up to be a volunteer cyanobacteria monitor


VT DEC Watershed Management Division 1 National Life Drive, Main 2  Montpelier, VT  05620-3522  Tele: 802-828-1535   Fax: 802-828-1544


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