State Issues Cyanobacteria Warning for Showell Pond, Sandown, NH
Concord, NH – An elevated cyanobacteria cell concentration has been measured at Showell Pond in Sandown, NH. Large floating clumps of blue–green scum have been seen floating near the shore of Showell Pond. Blooms of many cyanobacteria have been observed at Showell Pond in five of the last six summers. As a result, the New Hampshire Department of Environmental Services (DES) has issued a cyanobacteria warning for those who recreate on Showell 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 surface scum or blue-green flecks. DES also advises pet owners to keep their pets out of any waters that have a surface scum or blue-green color to the water.
Lake users should avoid areas of the lake where blue–green clumps are floating in the lake.
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 to 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 that ranging in severity. Acute health effects include irritation of skin and mucous membranes, nausea, vomiting, and diarrhea. Chronic effects include liver and central nervous system damage.
The June 16, 2010 warning will remain in effect until additional samples reveal cyanobacteria levels have diminished.
Photos and information about cyanobacteria can be found at the DES Beach Program web site: http://des.nh.gov/organization/divisions/water/wmb/beaches/index.htm 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)419-922.
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