NHDES UPDATE: CYANOBACTERIA ADVISORY HAS BEEN LIFTED ON MIDDLE DANFORTH POND
News from the New Hampshire Department of Environmental Services
State REMOVES Cyanobacteria Advisory for Middle Danforth Pond in Freedom, NH
Concord, NH – The New Hampshire Department of Environmental Services (DES) has REMOVED a cyanobacteria advisory issued for Middle Danforth Pond in Freedom, NH. Samples collected 8/12 and 8/13 revealed that there were no cyanobacteria from shorelines around Middle Danforth Pond. The connected upper and lower ponds were also surveyed for scums. The distinct odor of cyanobacteria still persists. While the bloom has visually dissipated, DES advises lake-goers to look out for surface scum accumulations. Please continue to monitor your individual shoreline for changing conditions.
NHDES monitors public beaches and public waters of the state for cyanobacteria. Once a cyanobacteria advisory has been issued, NHDES returns to affected waterbodies weekly until the cyanobacteria standards are again met. NHDES advises lake users to avoid contact with the water in areas experiencing elevated cyanobacteria cell conditions. NHDES also advises pet owners to keep their pets out of any waters that have a cyanobacteria bloom.
This advisory was not based on a toxin evaluation and was intended as a precautionary measure for short term exposure. 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.
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