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New Hampshire Department of Environmental Services

Media Center
DATE: June 4, 2009
CONTACT: Jody Connor (603) 271-3414 or 419-9229
Sonya Carlson (603) 271-0698

State Issues Cyanobacteria Warning for Lake Monomonac, Rindge, NH, and Winchendon, MA

Concord, NH - The New Hampshire Department of Environmental Services (DES) has issued a cyanobacteria warning for those who recreate on Lake Monomonac in Rindge, NH and Winchendon, MA. The June 4, 2009 warning will remain in effect until additional samples reveal cyanobacteria levels have diminished. DES advises lake users to avoid contact with the water in areas experiencing cyanobacteria bloom conditions. DES also advises pet owners to keep their pets out of any waters that have a surface scum.

Lake users should be on the lookout for cyanobacteria blooms. The current bloom is variable with portions of the lake reporting no evidence of a bloom and other areas of the lake exhibiting a blue-green hue. Recent sightings report congregations of the blue-green hue in some coves of the lake.

DES routinely monitors public beaches and lakes for cyanobacteria. Cyanobacteria are natural components of many water bodies in New Hampshire. Cyanobacteria may bloom and form surface scums when excess phosphorus and ample sunlight are available. Some cyanobacteria produce toxins that are stored within the cells but released upon cell death. Toxins can cause both acute and chronic health effects ranging in severity from skin and mucous membrane irritations, nausea, vomiting, and diarrhea to liver and central nervous system damage.

Visit the DES Beach Program website at for photos and more information about cyanobacteria. Updates on advisories and warnings may be obtained at

If you notice anything resembling cyanobacteria, please refrain from wading, swimming, or drinking the water. Keep all pets out of the water and contact DES immediately. Please call DES to report a cyanobacteria bloom at (603)419-9229

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NH Department of Environmental Services | 29 Hazen Drive | PO Box 95 | Concord, NH 03302-0095
(603) 271-3503 | TDD Access: Relay NH 1-800-735-2964 | Hours: M-F, 8am-4pm

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