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New Hampshire Department of Environmental Services

Media Center
DATE: September 4, 2009
Jody Connor (603) 271-3414 or 419-9229
Teresa Ptak (603) 271-8803

State Issues Cyanobacteria Warning for Goose Pond, Canaan

Concord, NH – An elevated cyanobacteria cell concentration has been measured in Goose Pond, Canaan. Samples revealed that the state standard of 50% or greater of the total cell count was identified as cyanobacteria. As a result, the New Hampshire Department of Environmental Services (DES) has issued a cyanobacteria warning for those who recreate on Goose Pond. This warning is not based on a toxin evaluation and is intended as a precautionary measure for short term exposure. DES advises lake users to avoid contact with the water in areas experiencing elevated cyanobacteria cell conditions typically where lake water has a blue-green surface scum or swirls. DES also advises pet owners to keep their pets out of any waters that have a surface scum or blue-green swirls.

Lake users should be on the lookout for cyanobacteria surface scums. The current bloom is variable with some lake portions free of visual surface scums while other areas have a green to blue-green color to the water. Recent sightings report congregations of cyanobacteria along the east shoreline and the boat launch.

DES routinely monitors public beaches and public waters of the state for cyanobacteria. DES monitors public waters issued cyanobacteria warnings on a weekly basis until the cyanobacteria standards are again met. Cyanobacteria are natural components of water bodies worldwide, but blooms and surface scums may form when excess phosphorus is available in the water. 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 for humans and animals.

The September 4, 2009 warning will remain in effect until additional samples reveal cyanobacteria levels have diminished.

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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