Reporting confirmed, active cyanobacteria blooms by location within their respective watershed areas in New York State.

The information in this report is intended to help recreational water users enjoy summer at the lakes while avoiding any ill effects from confirmed blooms.

Exposure to hazardous algae blooms, (cyanobacteria) and the toxins they produce can pose health risks to people and pets.  Hazardous algae blooms/cyanobacteria can produce and release toxins in the water, even after the visible bloom has dissipated.

The good news is, the presence of a confirmed bloom in large lakes and rivers is in many cases contained to specific shorelines, coves or bays. The waterbodies included in this report may have clean and clear beaches and open water fully supporting recreational uses.  Check on your destination site conditions before heading out, and choose your access point in an area clear of HABs.

This report does not include marine algal blooms, impacting coastal beaches (red tide and brown tides), or filamentous green algae, which does not produce toxins.

NY HABs Report for Sept 26 – Oct 2, 2022. 1

Widespread/Lakewide Bloom remains active in DeRuyter Reservoir, Susquehanna River watershed. 1

Central Watersheds (30 active) 4

Upper Hudson River Watershed (0 active) 4

Mohawk River Watershed (1 active) 4

Mariaville Lake (1 active) 4

Lower Hudson River Watershed (5 active) 4

Unnamed Water Body (La Grange) (1 active) 4

Beaver Dam Lake (1 active) 5

Unnamed Water (1 active) 5

Tomkins Lake (1 active) 5

Nassau Lake (1 active) 5

Delaware River (2 active) 5

Cannonsville Reservoir (1 active) 5

Pleasure Lake (1 active) 5

Housatonic River (0 active) 5

Atlantic Ocean/Long Island Sound Watershed (22 active) 5

Harlem Meer (2 active) 6

The Lake in Central Park (2 active) 6

Morningside Pond (1 active) 6

Silver Lake Reservoir (1 active) 6

Brooks Pond (1 active) 6

Willowbrook Lake (1 active) 6

Prospect Park Lake (2 active) 6

Goose Pond (1 active) 7

Agawam Lake (3 active) 7

Mill Pond – Watermill (1 active) 7

Wolfe’s Pond (1 active) 8

Martlings Pond/Richmond Lake (1 active) 8

NE Watersheds (2 active) 8

Lake Champlain Watershed (0 active) 8

St. Lawrence River Watershed (2 active) 8

Moon Lake (1 active) 8

Hyde Lake (1 active) 8

NW Watersheds (30 active) 9

Lake Ontario Minor Tributaries Watershed (1 active) 9

North Sandy Pond (1 active) 9

Black River Watershed (0 active) 9

Niagara River – Lake Erie Watershed (1 active) 9

Indian Falls Lake (1 active) 9

Genesee River Watershed (0 active) 9

Oswego River – Finger Lakes Watershed (26 active) 9

Canandaigua Lake (12 active) 9

Cayuga Lake (7 active) 10

Owasco Lake (4 active) 11

Owasco Outlet (1 active) 11

Keuka Lake (1 active) 11

South/West Watersheds (10 active) 11

Allegheny River Watershed (2 active) 11

Chautauqua Lake (2 active) 12

Chemung River (2 active) 12

Waneta Lake (1 active) 12

Bradley Brook Reservoir (1 active) 12

Susquehanna River Watershed (4 active) 12

Otsego Lake (1 active) 12

Nanticoke Lake (1 active) 12

DeRuyter Reservoir (1 active) 12

Beaver Lake (1 active) 13

Ramapo River Watershed (1 active) 13

Hackensack River (1 active) 13

Central Watersheds (30 active) draining a portion of interior NYS down to the Atlantic Ocean via Long Island Sound, including the water supply for New York City

Upper Hudson River Watershed (0 active) drains an area in central NYS to the east of centre, starting in the Adirondacks, flowing south toward Long Island Sound; the section south of Albany is reported as Lower Hudson River Watershed.

Mohawk River Watershed (1 active) drains the area starting just west of centre of NYS, gathers run-off through the south side of the Adirondacks as it flows mainly east to join the Hudson River in Albany County. Schoharie Creek flows north from the Catskills and drains a channel of central state north to join the Mohawk River.

Mariaville Lake (1 active)

• Sep 17, 12:49 pm widespread/lakewide bloom confirmed in Schenectady County remains active this week.

Lower Hudson River Watershed (5 active) draining the lower portion of New York State interior out to the Atlantic.

Unnamed Water Body (La Grange) (1 active)

• Sep 20, 2:25 pm bloom of unreported extent reported in Dutchess County. Reported by NYS Parks.

Beaver Dam Lake (1 active)

• Sep 19, 10:16 am large localized bloom confirmed in Orange County remains active this week.

Unnamed Water (1 active)

• Sep 22, 11:54 am large localized bloom confirmed in Dutchess County. Reported by the public.

Tomkins Lake (1 active)

• Sep 18, 9:15 am widespread/lakewide bloom confirmed in Rockland County remains active this week.

Nassau Lake (1 active)

• Sep 19, 7:45 am widespread/lakewide bloom confirmed in Rensselaer County remains active this week.

Delaware River (2 active) drains a portion of south-central NYS into the Delaware River and out to Long Island Sound.

Cannonsville Reservoir (1 active)

• Sep 20, 12:17 pm large localized bloom confirmed in Delaware County. Reported by NYC DEP.

Pleasure Lake (1 active)

• Sep 18, 9:30 am large localized bloom confirmed in Sullivan County. Reported by CSLAP.

Housatonic River (0 active) draining a small part of Dutchess County, the river itself originates in Vermont, flows south through Massachusetts and Connecticut to the outlet into Long Island Sound east of Bridgeport.

Atlantic Ocean/Long Island Sound Watershed (22 active)

Drains the city brooks, creeks and rivers into Long Island Sound.

Harlem Meer (2 active)

• Sept 27, 11:53 am widespread/lakewide bloom confirmed in Manhattan (New York) remains active this week.
• Sept 19, 2 pm large localized bloom confirmed in Manhattan (New York). Reported by NYC Parks.

The Lake in Central Park (2 active)

• Sept 27, 9 am widespread/lakewide bloom confirmed in Manhattan (New York). Reported by NYC Parks.
• Sept 19, 10:30 am widespread/lakewide bloom confirmed in Manhattan (New York) remains active this week.

Morningside Pond (1 active)

• Sep 27, 10:50 am widespread/lakewide bloom confirmed in Manhattan (New York). Reported by NYC Parks.

Silver Lake Reservoir (1 active)

• Sep 26, 12:30 pm widespread/lakewide bloom confirmed in Staten Island (Richmond). Reported by NYC Parks. 

Brooks Pond (1 active)

• Sep 28, 9:43 am widespread/lakewide bloom confirmed in Staten Island (Richmond County). Reported by NYC Parks. 

Willowbrook Lake (1 active)

• Sep 26, 12:33 pm widespread/lakewide bloom confirmed in Staten Island (Richmond). Reported by NYC Parks.

Prospect Park Lake (2 active)

• Sept 26, 1:30 pm widespread/lakewide bloom confirmed in Kings County. Reported by NYC Parks.
• Sept 22, 1:14 pm widespread/lakewide bloom confirmed in Kings County (Brooklyn) remains active this week.

Goose Pond (1 active)

• Sept 26, 10:52 am widespread/lakewide bloom confirmed in Queens. Reported by NYC Parks.

Agawam Lake (3 active)

• Sep 27, 5:38 pm widespread/lakewide bloom of confirmed in Suffolk County. Reported by Stony Brook University.
• Sep 20, 8:03 pm widespread/lakewide bloom of confirmed in Suffolk County remains active this week.
• Sep 15, 4:17 pm widespread/lakewide bloom of confirmed in Suffolk County remains active this week.

Mill Pond – Watermill (1 active)

• Sep 20, 8:12 pm bloom of unreported extent confirmed in Suffolk County. Reported by Stony Brook University. 

Wainscott Pond (2 active)

• Sep 27, 5:40 pm widespread/lakewide bloom of confirmed in Suffolk County. Reported by Stony Brook University.
• Sep 20, 8:16 pm widespread/lakewide bloom confirmed in Suffolk County remains active this week.

Big Reed Pond (1 active)

• Sep 20, 8:19 pm bloom of unreported extent confirmed in Suffolk County. Reported by Stony Brook University. 

Old Town Pond (1 active)

• Sep 20, 8:17 pm bloom of unreported extent confirmed in Suffolk County remains active this week.

 Artist Lake (1 active)

• Sep 19, 1:33 pm small localized bloom confirmed in Suffolk County remains active this week.

Wolfe’s Pond (1 active)

• Sep 28, 12:35 pm widespread/lakewide bloom confirmed in Staten Island (Richmond)

Martlings Pond/Richmond Lake (1 active)

• Sep 28, 9:46 am widespread/lakewide bloom confirmed in Staten Island (Richmond). Reported by NYC Parks.

NE Watersheds (2 active) draining upstate NY out to the St. Lawrence River. Flows originate in the north-central Adirondacks, flowing generally north and east to the St. Lawrence River and out to the Atlantic Ocean.

Lake Champlain Watershed (0 active)

St. Lawrence River Watershed (2 active)

Moon Lake (1 active)

• Sep 17, 1 pm open water bloom confirmed in Jefferson County. Reported by CSLAP.

Hyde Lake (1 active)

• Sep 27, 2:43 pm large localized bloom confirmed in Jefferson County. Reported by the public.

NW Watersheds (30 active) (draining west to Lake Erie or Lake Ontario)

Lake Ontario Minor Tributaries Watershed (1 active)

North Sandy Pond (1 active)

• Sep 17, 1:07 pm open water bloom confirmed in off West Shore Drive in Wayne County remains active this week.

Black River Watershed (0 active) draining an area of central NYS west to Lake Ontario

Niagara River – Lake Erie Watershed (1 active) draining northwest NYS west to Lake Erie

Indian Falls Lake (1 active)

• Sep 17, 9:30 am widespread/lakewide bloom confirmed in Genesee County, off the north shore in the bay west off Sliker Rd remains active this week.

Genesee River Watershed (0 active) draining a band of west-central NYS from the south border to the north, emptying into Lake Ontario at Rochester, Monroe County

Oswego River – Finger Lakes Watershed (26 active)

Canandaigua Lake (12 active)

• Sep 24, 5 pm small localized bloom confirmed in Ontario County. Reported by Canandaigua Lake Watershed Association. 
• Sep 24, 3:30 pm small localized bloom confirmed in Ontario County. Reported by Canandaigua Lake Watershed Association. 
• Sep 24, 3:17 am small localized bloom confirmed in Ontario County. Reported by Canandaigua Lake Watershed Association. 
• Sep 24, 12:37 pm small localized bloom confirmed in Ontario County. Reported by Canandaigua Lake Watershed Association. 
• Sep 18, 3:20 pm small localized bloom confirmed in Ontario County, remains active this week.
• Sep 17, 1:59 pm large localized bloom confirmed in Ontario County, off the east shore south of Blossom Rd and Lake Rd. remains active this week.
• Sep 17, 5:01 pm small localized bloom confirmed in Ontario County, off the east shore south of Jones Rd. remains active this week.
• Sep 17, 4 pm small localized bloom confirmed midlake toward the south end of the water body in Yates County remains active this week.
• Sep 17, 3 pm small localized bloom confirmed in Ontario County, off the west shore south of Onanda Park remains active this week.
• Sep 17, 6:19 pm open water bloom confirmed in Ontario County, off the west shore north of Onanda Park remains active this week.
• Sep 17, 3:44 pm widespread/lakewide bloom confirmed mid-lake in Ontario County, toward the north end of the water body remains active this week.
• Sep 17, 1:16 pm small localized bloom confirmed in Ontario County, off the west shore in the north end of the water body remains active this week.

Cayuga Lake (7 active)

• Sep 24, 5:10 pm large localized bloom confirmed in Cayuga County. Reported by Community Science Institute.
• Sep 24, 4:43 pm large localized bloom confirmed in Cayuga County. Reported by Community Science Institute.
• Sep 24, 1 pm large localized bloom confirmed in Cayuga County. Reported by Community Science Institute.
• Sep 24, 9:30 am large localized bloom confirmed in Cayuga County. Reported by Community Science Institute.
• Sep 22, 11:30 am small localized bloom confirmed off the east shore in Cayuga County. Reported by Community Science Institute.
• Sep 17, 1:10 pm small localized bloom confirmed off the east shore in Cayuga County remains active this week.
• Sep 17, 4:38 pm large localized bloom confirmed off the east shore in Cayuga County, near the intersection of S. Cayuga and Arnold St. remains active this week.

Owasco Lake (4 active)

• Sep 24, 4:51 pm small localized bloom confirmed in Cayuga County. Reported by the public.
• Sep 20, 2:47 pm small localized bloom confirmed in Cayuga County remains active this week.
• Sep 18, 10 am large localized bloom confirmed in Cayuga County remains active this week.
• Sep 17, 3:12 pm large localized bloom confirmed in Cayuga County remains active this week.

Owasco Outlet (1 active)

• Sep 16, 12:35 pm large localized bloom confirmed in Cayuga County remains active this week.

Keuka Lake (1 active)

• Sep 22, 11 am small localized bloom confirmed in Yates County. Reported by  Keuka Lake Association.

Lamoka Lake (1 active)

• Sep 24, 11:20 am large localized bloom confirmed in Schulyer County. Reported by the public.

South/West Watersheds (10 active) draining southwest NYS west to the Ohio River/Mississippi system; and the watersheds draining the south central NYS down to the Atlantic via Chesapeake Bay)

Allegheny River Watershed (2 active) – drains West to the Ohio River.

Chautauqua Lake (2 active)

• Sep 18, 1:01 pm large localized bloom confirmed in Chautauqua County remains active this week.
• Sep 16, 12:35 pm large localized bloom confirmed in Chautauqua County remains active this week.

Chemung River (2 active) drains central NYS south to Susquehanna River and out to Chesapeake Bay/Atlantic Ocean.

Waneta Lake (1 active)

• Sep 24, 1:45 pm widespread/lakewide bloom confirmed in Chemung County. Reported by the public.

Bradley Brook Reservoir (1 active)

• Sep 20, 11:45 am small localized bloom confirmed in Madison County remains active this week.

Susquehanna River Watershed (4 active) drains south-central New York State flowing southwest, then south, eventually emptying into the Atlantic Ocean at Chesapeake Bay.

Otsego Lake (1 active)

• Sep 17, 6:48 am small localized bloom confirmed in Otsego County remains active this week.

Nanticoke Lake (1 active)

• Sep 16, 4 pm small localized bloom confirmed in Broome County remains active this week.

DeRuyter Reservoir (1 active)

• Sep 16, 9:45 am widespread/lakewide bloom confirmed in Madison County remains active this week.

Beaver Lake (1 active)

• Sep 18, 10:30 am widespread/lakewide bloom confirmed in Broome County. Reported by CSLAP.

Ramapo River Watershed (1 active)  drains a small section in the southeast part of New York State south through New Jersey and out into the Atlantic Ocean at Chesapeake Bay.

Hackensack River (1 active)

• Sep 27, 12:13 pm widespread/lakewide bloom confirmed in Rockland County. Reported by DEC staff.