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New Hampshire Department of Environmental Services

Media Center

DATE: July 5, 2018
CONTACT: Amanda McQuaid (603) 271-0698 (O), 848-8094 (C)

State Issues Cyanobacteria Lake Warning for Phillips Pond in Sandown, New Hampshire

Concord, NH – A cyanobacteria bloom has been accumulating in Phillips Pond in Sandown, New Hampshire. Samples were collected at the boat ramp and from the middle of the lake. Cyanobacteria concentrations were elevated throughout the lake. Cells were identified as Woronichinia, Microcystis and Anabaena at 87,750 cells/ml. As a result, the New Hampshire Department of Environmental Services (NHDES) has issued a cyanobacteria beach advisory and lake warning for those who swim at the beach and use the waterbody for recreation. 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 toxin evaluation 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-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. 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 but 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.

The warning went into effect on July 13, 2018, and will remain in effect until additional samples reveal cyanobacteria levels have diminished.

A cyanobacteria bloom has been found throughout Phillips Pond in Sandown, NH. Samples collected July 12 contained 87,750 cells/ml of cyanobacteria. The lake warning was issued July 13, 2018.

Cyanobacteria bloom at Greenwood Pond in Kingston.

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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