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New Hampshire Department of Environmental Services

Media Center

DATE: July 3, 2018
CONTACT: Amanda McQuaid (603) 271-0698 (O), 848-8094 (C)

State REMOVES Cyanobacteria Lake Warning and Beach Advisory for Long Pond and Pelham Town Beach in Pelham, NH

Concord, NH – The New Hampshire Department of Environmental Services (DES) has REMOVED a cyanobacteria lake warning issued on 6/29/2018. The advisory was issued based on visual evidence of accumulations of cyanobacteria at the beach. Samples collected from the Pelham Town Beach on July 3, 2018 had no visible accumulations of cyanobacteria, however there were some species identified by microscopy. Cyanobacteria were identified as Anabaena/Dolichospermum, Microcystis, Aphanocapsa and Gloeocapsa with the total cell concentration of 11,754 cells/ml. Please continue to monitor your individual shoreline for changing conditions.

Cyanobacteria are natural components of water bodies worldwide, but blooms and surface scums may form when excess nutrients are available to the water. Some cyanobacteria produce toxins that are stored within the cells that can be 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 include liver and central nervous system damage.

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-green flecks aggregating along the shore. NHDES also 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 for cyanobacteria. 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.

The warning went into effect on June 29, 2018, and was removed on July 3, 2018.

Visit the NHDES Beach Program website for photos and more information about cyanobacteria at
Updates on advisories and warnings may be obtained at
Follow the Beaches twitter feed:

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.

The cyanobacteria bloom accumulating at the Pelham Town Beach on Long Pond has dissipated. Samples collected July 3 had some cyanobacteria with concentrations below the state threshold of 70,000 cells/ml. The advisory was issued June 29 and was removed July 3, 2018.

The cyanobacteria bloom has dissipated from Jericho State Park Beach in Berlin, NH.

NH Department of Environmental Services | 29 Hazen Drive | PO Box 95 | Concord, NH 03302-0095
(603) 271-3503 | TDD Access: Relay NH 1-800-735-2964 | Hours: M-F, 8am-4pm

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