State Removes Cyanobacteria Advisory for Greenwood Pond in Kingston, New Hampshire
The New Hampshire Department of Environmental Services (NHDES) has REMOVED a cyanobacteria advisory for Greenwood Pond that was issued on 7/15/2021. Cyanobacteria advisories are issued when concentrations exceed 70,000 cells/ml. Cyanobacteria were identified as Planktothrix, Woronichinia, and Dolichospermum. More samples were collected on 7/20/2021 and cyanobacteria cell concentrations were 44,750 cells/ml. While cell concentrations have lowered at this time, NHDES advises lake-goers to look out for green surface accumulations in the future. Blue-green flecks and globs of cyanobacteria are commonly observed on this pond. Please continue to monitor your individual shoreline for changing conditions.
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.
The advisory went into effect on July 15, 2021 and was removed on July 20, 2021.
If you notice anything resembling cyanobacteria, please refrain from wading, swimming, or drinking the water. Keep all pets out of the water and contact NHDES immediately. Please call NHDES to report a cyanobacteria bloom at (603) 848-8094 or email HAB@des.nh.gov.