State Issues Cyanobacteria Warning for Lake Waukewan,
Meredith & New Hampton
Concord, NH – An elevated cyanobacteria cell concentration has been measured in Lake Waukewan in Meredith and New Hampton. Samples revealed that the state standard of 50 percent 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 Lake Waukewan. 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 in proximity to the Meredith 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 August 24, 2009 warning will remain in effect until additional samples reveal cyanobacteria levels have diminished.
Visit the DES Beach Program website at http://des.nh.gov/organization/divisions/water/wmb/beaches/index.htm for photos and more information about cyanobacteria. Updates on advisories and warnings may be obtained at http://www2.des.state.nh.us/Advisories/Beaches/.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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