Blue-Green Algae Bloom in Wainscott Pond

Sampling performed by officials from the State University at Stony Brook has confirmed the presence of a cyanobacteria bloom, or blue-green algae, in Wainscott Pond. Cyanobacteria blooms are also present at Lake Agawam in Southampton, Mill Pond in Water Mill, Roth Pond in Stony Brook, Laurel Lake in Laurel, Maratooka Lake in Mattituck, and Fresh Pond on Shelter Island.

Residents have been advised not to swim or wade in these waters and to keep pets and children away from them.

Though blue-green algae are naturally present in lakes and streams in low numbers, they can become abundant, forming blooms in shades of green, blue-green, yellow, brown, or red. They may produce floating scums on the surface of the water or may cause the water to take on a paint-like appearance.

Contact with waters that appear scummy or discolored should be avoided. If contact does occur, rinse off with clean water immediately. Seek medical attention if any of the following symptoms occur after contact: nausea, vomiting or diarrhea; skin, eye, or throat irritation, or allergic reactions or breathing difficulties.

To report a suspected blue-green algae bloom at a body of water that contains a Suffolk County-permitted bathing beach, residents have been asked to contact the County Health Department's office of ecology at 631-852-5760 between 8:30 a.m. and 4:30 p.m. or by email at

To report a suspected blue-green algae bloom that is in a body of water that does not contain a county permitted bathing beach, residents have been asked to contact the division of water at the State Department of Environmental Conservation at 518-402-8179 between 8 a.m. and 4 p.m. or via email at

The D.E.C.’s harmful algal bloom notification page offers a comprehensive list of affected water bodies in the state.