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Attention: To the LKWA Community

Cynobacteria Advisory



Lake Kanasatka Cyanobacteria Bloom Advisory 


News from the New Hampshire Department of Environmental Services


DATE: 09/10/2020

CONTACT: Amanda McQuaid (603) 848-8094 (C);

State Issues Cyanobacteria Alert for

Lake Kanasatka in Moultonborough, New Hampshire

 Concord, NH- A cyanobacteria bloom has been observed on Lake Kanasatka. An advisory was in place from August 12 to August 26. Cyanobacteria cell counts have been below 70,000 cells/ml since then. On September 10th, a surface scum was spotted along the shoreline. This alert is intended as a message to inform the community of the bloom. This is not an official advisory since samples have not been collected by NHDES at this time.

Surface blooms can rapidly change and accumulate in various locations around a waterbody. As a result, the New Hampshire Department of Environmental Services (NHDES) has issued a cyanobacteria alert for those who use the waterbody for recreation. Please continue to monitor your individual shorelines for changing conditions and avoid contact. The alert is not based on a toxin evaluation and is intended as a precautionary measure for short term exposure.

NHDES advises lake users to avoid contact with the water in areas experiencing elevated cyanobacteria cell conditions, also known as a bloom. NHDES also advises pet owners to keep their pets out of any waters that have a cyanobacteria bloom.

Cyanobacteria are natural components of water bodies worldwide, though blooms and surface scums may form when excess nutrients are available to the water.  Some cyanobacteria produce toxins that are stored within the cells and released upon cell death. Toxins can cause both acute and chronic health effects that range in severity.  Acute health effects include irritation of skin and mucous membranes, tingling, numbness, nausea, vomiting, seizures and diarrhea. Chronic effects may include liver and central nervous system damage. Be cautious of lake water that has a surface scum, changes colors, or appears to have green streaks or blue-green flecks aggregating along the shore.

Visit the NHDES Beach Program website for photos and more information about cyanobacteria at:

Updates on cyanobacteria advisories may be obtained at:

Follow the Beaches twitter feed:

 If you notice anything resembling cyanobacteria, please refrain from wading, swimming, or drinking the water.  Keep all pets out of the water and contact NHDES immediately. Please call NHDES to report a cyanobacteria bloom at (603) 848-8094 or email

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