Harmful Blue-Green Algae Bloom-related Beach Closure Summary

More regulated beaches are closing their swimming areas more frequently and for longer periods of time to ensure that people avoid contact with blue-green algae blooms and their toxins. When a blue-green algae bloom is present at a bathing beach, the swimming area must be closed to protect public health, regardless if toxins are present.


2021 Summary Data

Map of counties with lost beach days due to harmful blue-green algal blooms
County # Times Beaches Closed # Beaches Closed Waterbodies with Beach Closures # Lost Beach Days 
Broome Greenwood Park Lake, Whitney Point Reservoir, 120
Cattaraugus Quaker Lake, Red House Lake 61 
Cayuga Cayuga Lake, Owasco Lake 51
Chautauqua 1 Chautauqua Lake 31 
Clinton 6 2 Lake Champlain 22
Delaware 2 2 East Sidney Lake, Launt Lake 67
Essex 4 3 Lake Champlain 24
Jefferson 5 3 Lake Ontario 21
Livingston 5 2 Conesus Lake 36
Oneida 1 1 Oneida Lake 6
Onondaga 2 2 Cross Reservoir, Jamesville Reservoir 14
Ontario 3 3 Honeoye Lake, Canandaigua Lake 27
Putnam 27 13 Lake Carmel, Lake Casse, Putnam Lake, Lake Peekskill, Cortlandt Lake, Oscawana Lake, Roaring Brook Lake 314
Rockland 3 2 Lake welch, Lake Boyce 14
Tompkins 5 4 Cayuga Lake, Jennings Pond  60
Westchester 3 2 Lake Mohegan 25
Wyoming 1 1 Yogi and Boo Boo's Campground Pond 28
Yates 2 2 Keuka Lake 13