Concord, NH – An elevated cyanobacteria cell concentration has been measured from samples collected at Elm Brook Park Beach, Hopkinton. Samples were collected by the Army Corp ofEngineers who monitored this beach and observations were made at the boat launch, beach and fishing platform. Samples revealed that the state threshold of 70,000 cells/ml or greater of cyanobacteria wasexceeded. The cyanobacteria were identified as Anabaena/Dolichospermum, Microcystis and Woronichinia. The bloom was described to be dense and stretched atleast 1,000 feet around the beach. As a result, the New Hampshire Department of Environmental Services (NHDES) has issued a cyanobacteria beach advisory for those who recreate at the beach. It is also advised to look out for accumulations in other areas of the lake or shorelines. Please continue to monitor your individual shoreline for changing conditions.
This warning is not based on a toxinevaluation and is intended as a precautionary measure for short term exposure.NHDES advises lake users to avoid contact with the water in areas experiencing elevated cyanobacteria cell conditions typically where lake water has a surface scum, green streaks or blue-greenflecks aggregating along the shore. NHDESalso advises pet owners to keep their pets out of any waters that have a cyanobacteria bloom.
NHDES routinely monitors public beaches and public waters of the state forcyanobacteria. Once a cyanobacteria lake warning or beach advisory has been issued, NHDES returns to affected waterbodies on a weekly basis until the cyanobacteria standards are again met.Cyanobacteria are natural components of water bodies worldwide, but blooms andsurface scums may form when excess nutrients are 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 range in severity. Acute healtheffects include irritation of skin and mucous membranes, tingling, numbness, nausea,vomiting, seizures and diarrhea. Chronic effects include liver and central nervous system damage.
The warning went into effect on June 12,2018, and will remain in effect until additional samples reveal cyanobacterialevels have diminished.
Visit the NHDES Beach Program website for photos and more information about cyanobacteria at https://www.des.nh.gov/organization/divisions/water/wmb/beaches/index.htm
Updates on advisories and warnings may be obtained at http://www4.des.state.nh.us/WaterShed_BeachMaps/WaterShed_BeachMaps.aspx
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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.