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New Hampshire Department of Environmental Services
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FOR IMMEDIATE RELEASE
DATE: October 17, 2018
CONTACT: Amanda McQuaid (603) 271-0698 (O), 848-8094 (C)
des.nh.gov
twitter.com/NHDES

State REMOVES Cyanobacteria Warning for White Oak Pond and Pipers Cove of Squam Lake in Holderness, New Hampshire

Concord, NH – The New Hampshire Department of Environmental Services (DES) has REMOVED a cyanobacteria warning issued on 10/12/2018 upon receiving samples from the Squam Lake Association. A cyanobacteria bloom was observed on White Oak Pond in Holderness, NH. The bloom appeared near the outlet connecting to Pipers Cove on Squam Lake. The bloom was also observed at the Squam Lake Association boat launch on Squam Lake in Holderness, New Hampshire. Samples from both locations were identified and enumerated, appearing to have been a connected bloom between the two waterbodies. An estimate of 4.4 million cells/ml of cyanobacteria, comprised of Microcystis and Anabaena/Dolichospermum, were found on White Oak near the outlet on 10/9/18. The Squam Lake boat launch near the inlet had 1.75 million cells/ml of the same types of cyanobacteria on 10/10/18. The state threshold for a warning or advisory is 70,000 cells/ml of cyanobacteria in NH lake water. There have been no reports or sightings of the bloom since then. New samples collected on October 16, 2018 showed that the bloom has dissipated at this time. There were no observations of cyanobacteria. 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 October 12, 2018, and was removed on October 17, 2018.

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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