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New Hampshire Department of Environmental Services
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FOR IMMEDIATE RELEASE
DATE: June 19, 2019
CONTACT: Amanda McQuaid (603) 271-0698 (O), 848-8094 (C)
des.nh.gov
twitter.com/NHDES

State Issues Cyanobacteria Advisory for Willand Pond in Dover/Somersworth, New Hampshire

Concord, NH – A cyanobacteria bloom has been observed on Willand Pond in Dover and Somersworth, NH. Samples collected from a shoreline cove exceeded the State threshold of 70,000 cells/ml of cyanobacteria. Samples contained a mix of cyanobacteria taxa; Anabaena/Dolichospermum and Planktothrix/Oscillatoria were estimated as 673,500 cells/ml from areas observed as surface scum accumulations. Other samples from around the lake had much lower concentrations ranging from no cells to 5,250 cells/ml. These concentrations are more representative of the open water conditions away from the bloom conditions. However, surface blooms can rapidly change and accumulate in various locations around a waterbody. As a result, the New Hampshire Department of Environmental Services (NHDES) has issued a cyanobacteria advisory for those who use the waterbody for recreation. Please continue to monitor your individual shoreline for changing conditions and avoid contact.

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 is not based on a toxin evaluation and is 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 cyanobacteria advisory went into effect on June 19, 2019 and will remain in effect until NHDES confirms that cell concentrations of the bloom have subsided.

 

Shoreline accumulations of cyanobacteria along Willand Pond in Dover and Somersworth, NH on June 18, 2019

Willand Pond in Dover and Somersworth, NH

Visit the NHDES Beach Program website for photos and more information about cyanobacteria at www.des.nh.gov/organization/divisions/water/wmb/beaches/index.htm
Updates on advisories and warnings may be obtained at www4.des.state.nh.us/WaterShed_BeachMaps/WaterShed_BeachMaps.aspx
Follow the Beaches twitter feed:
twitter.com/NHDES_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 NHDES immediately. Please call NHDES to report a cyanobacteria bloom at (603) 848-8094.




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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