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Harmful Algal Blooms (HABs) Notifications Page

2017 HABs Notifications

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There may be other waterbodies with blooms that have not been reported to the DEC.

The map below displays the location of current freshwater HABs in New York State. Each location is labeled with a number that corresponds to the table located below the maps. The information is updated weekly. This page was last updated on 8/18/17.

Important information

Map of waterbodies sampled by DEC and those with HABs in NY.

Detailed map of HABs locations in NYC and LI

Waterbodies with HABs Notifications
Map Number Waterbody Name County Bloom Status Extent of Bloom Status Date Type of Report Change in Status
1 Agawam Lake Suffolk Confirmed with High Toxins Widespread/Lakewide 8/16/17 Lab sample Updated listing
2 Allegheny Reservoir Cattaraugus Confirmed Large localized 8/8/17 Lab sample No change
3 Avon Marsh Dam Pond Livingston Confirmed with High Toxins Small localized 8/7/17 Lab sample Updated listing
4 Basic Creek Reservoir Albany Suspicious Large localized 8/11/17 Visual report No change
5 Beaver Lake Broome Confirmed Small localized 8/7/17 Lab sample No change
6 Black Lake* St Lawrence Confirmed Not reported 7/29/17 Lab sample No change
7 Brooks Lake Orange Suspicious Not reported 8/15/17 Visual report New
8 Brooks Lake Richmond Confirmed Large localized 8/3/17 Lab sample No change
9 Cayuta Lake Schuyler Suspicious Small localized 8/18/17 Visual report Updated listing
10 Chautauqua Lake* Chautauqua Confirmed Widespread/Lakewide 8/14/17 Lab sample Updated listing
11 Clove Lake Richmond Confirmed with High Toxins Widespread/Lakewide 8/3/17 Lab sample No change
12 Coxsackie Upper Reservoir Greene Confirmed Open water 8/2/17 Lab sample No change
13 Deans Pond Cortland Confirmed with High Toxins Widespread/Lakewide 8/3/17 Lab sample Updated listing
14 Dryden Lake Tompkins Confirmed Small localized 8/1/17 Lab sample No change
15 Eagle Pond Franklin Confirmed Small localized 8/13/17 Lab sample Updated listing
16 Evens Lake Sullivan Confirmed with High Toxins Large localized 8/1/17 Lab sample No change
17 Findley Lake Chautuaqua Confirmed Small localized 8/14/17 Lab sample New
18 Fort Pond Suffolk Confirmed Widespread/Lakewide 8/10/17 Lab sample No change
19 Golden Pond Queens Confirmed Widespread/Lakewide 8/15/17 Lab sample New
20 Harlem Meer New York Confirmed with High Toxins Large localized 8/14/17 Lab sample Updated listing
21 Hessian Lake Orange, Rockland Suspicious Not reported 8/15/17 Visual report New
22 Hollister Lake Greene Confirmed Not reported 8/2/17 Lab sample No change
23 Honeoye Lake* Ontario Suspicious Small localized 8/16/17 Visual report New
24 Indian Lake Bronx Confirmed Large localized 8/8/17 Lab sample Updated listing
25 Jamesville Reservoir Onondaga Confirmed Small localized 8/17/17 Lab sample New
26 Java Lake Wyoming Confirmed with High Toxins Widespread/Lakewide 8/7/17 Lab sample Updated listing
27 Lake Carmel Putnam Suspicious Not reported 8/9/17 Visual report Updated listing
28 Lake Casse Putnam Suspicious Small localized 8/9/17 Visual report No change
29 Lake Lacoma Monroe Confirmed Open water 8/6/17 Lab sample No change
30 Lake Neatahwanta Oswego Confirmed Not reported 8/15/17 Lab sample Updated listing
31 Lake Ontario (Long Point SP) Jefferson Suspicious Not reported 8/7/17 Visual report No change
32 Lake Peekskill Putnam Suspicious Not reported 8/10/17 Visual report No change
33 Lake Ronkonkoma Suffolk Confirmed with High Toxins Small localized 8/14/17 Lab sample Updated listing
34 Lawson Lake Albany Confirmed Small localized 8/9/17 Lab sample No change
35 Little We Wah Lake Orange Confirmed Not reported 8/15/17 Lab sample New
36 Maratooka Lake Suffolk Confirmed Not reported 8/7/17 Lab sample No change
37 Martlings Lake Richmond Confirmed with High Toxins Widespread/Lakewide 8/3/17 Lab sample No change
38 Mill Pond (Watermill) Suffolk Confirmed Widespread/Lakewide 8/16/17 Lab sample Updated listing
39 Millsite Lake Jefferson Suspicious Not reported 8/1/17 Visual report No change
40 Mohegan Lake Westchester Suspicious Not reported 7/27/17 Visual report Updated listing
41 Montgomery Lake Sullivan Confirmed Small localized 8/6/17 Lab sample No change
42 Myosotis Lake Albany Suspicious Not reported 8/14/17 Visual report New
43 Nassau Lake Rensselaer Confirmed Open water

8/17/17

Lab sample Updated listing
44 Oakland Lake Queens Confirmed Widespread/Lakewide 8/15/17 Lab sample Updated listing
45 Old Town Pond Suffolk Confirmed Widespread/Lakewide 8/16/17 Lab sample Updated listing
46 Oneida Lake* Multiple Suspicious Large localized 8/9/17 Visual report No change
47 Orange Lake Orange Confirmed Large localized 8/14/17 Lab sample New
48 Plymouth Reservoir Chenango Confirmed with High Toxins Small localized 8/9/17 Lab sample Updated listing
49 Prospect Park Lake Kings Confirmed with High Toxins Widespread/Lakewide 8/14/17 Lab sample Updated listing
50 Rockland Lake Rockland Confirmed Small localized 8/10/17 Lab sample Updated listing
51 Roth Pond Suffolk Confirmed Widespread/Lakewide 8/14/17 Lab sample Updated listing
52 Round Lake Saratoga Confirmed Widespread/Lakewide 8/10/17 Lab sample No change
53 Saratoga Lake* Saratoga Confirmed with High Toxins Small localized 8/8/17 Lab sample New
54 Silver Lake Wyoming Confirmed with High Toxins Widespread/Lakewide 8/9/17 Lab sample Updated listing
55 Silver Lake Reservoir Richmond Confirmed with High Toxins Large localized

8/3/17

Lab sample No change
56 Smith Pond Steuben Confirmed Open water 8/9/17 Lab sample No change
57 St Lawrence River (Coles Creek) St Lawrence Suspicious Not reported 8/1/17 Visual report No change
58 Sutherland Pond Columbia Confirmed with High Toxins Open water 8/1/17 Lab sample No change
59 The Lake in Central Park New York Confirmed with High Toxins Widespread/Lakewide 8/14/17 Lab sample Updated listing
60 Turtle Pond New York Confirmed with High Toxins Small localized 8/14/17 Lab sample Updated listing
61 Unnamed Pond (Wallkill) Ulster Confirmed Open water 8/6/17 Lab sample No change
62 Wainscott Pond Suffolk Confirmed Widespread/Lakewide 8/16/17 Lab sample Updated listing
63 Wilcox Park Pond Dutchess Suspicious Not reported 8/15/17 Visual report New
64 Winding Hills Park Lake Orange Confirmed Open water 7/31/17 Lab sample No change

* Blooms in large lakes or rivers may be limited to specific shorelines or confined bays. Portions of any of these waterbodies may be clear and fully support recreational uses.

This table reflected the status of harmful algal blooms as reported to DEC; public beach closure and drinking water information is available from your local health department (link leaves DEC website).

The 2017 DEC Lake Monitoring Program includes the Lake Classification and Inventory Survey (LCI), the Citizens Statewide Lake Assessment Program (CSLAP) and several individual lake sampling programs. The map above shows locations sampled within the previous three weeks. For specific information about the current sampling results for lakes sampled through the 2017 DEC Lake Monitoring Program (PDF, 85 KB), contact the Division of Water at 518-402-8179.

Bloom Status

DEC HABs Program staff use visual observations, digital photographs and laboratory sampling results to determine whether a bloom consists of cyanobacteria (also known as blue-green algae) or another type of algae. A waterbody with a bloom may have one of three statuses: Suspicious, Confirmed or Confirmed with High Toxins Bloom.

  • Suspicious Bloom: DEC staff determine that conditions fit the description of a cyanobacteria bloom (HAB), based on visual observations and/or digital photographs. It is not known if there are harmful toxins or other compounds in the water. The bloom may be present in all or part of the waterbody. Laboratory analysis has not been done to determine if this is a HAB. Cyanobacteria are irritants to some people even if toxins are not present so all contact with the bloom should be avoided. Blooms may be present in all or part of the waterbody.
  • Confirmed Bloom: Water sampling results have confirmed the presence of a cyanobacteria HAB which may produce toxins or other harmful compounds.
  • Confirmed with High Toxins Bloom: Water sampling results have confirmed that there are toxins present in enough quantities to potentially cause health effects when people and animals come in contact with the water through swimming or drinking.

Extent of Bloom

The extent of the bloom is a rough estimate of the size of the bloom within the waterbody and is recorded by monitoring program staff or from public reports.

  • Small Localized: Bloom affects a small area of the waterbody, limited from one to several neighboring properties.
  • Large Localized: Bloom affects many properties within an entire cove, along a large segment of the shoreline, or in a specific region of the waterbody.
  • Widespread/Lakewide: Bloom affects the entire waterbody, a large portion of the lake, or most to all of the shoreline.
  • Open Water: Sample was collected near the center of the lake and may indicate that the bloom is widespread and conditions may be worse along shorelines or within recreational areas. Special precautions should be taken in situations when a Confirmed with High Toxins Bloom is reported with an Open Water extent because toxins are likely to be even higher in shoreline areas.

Important Things to Know sbout HABs

  • If you see it - avoid it and report it!
  • People, pets and livestock should avoid contact with water that is discolored or has algae scums on the surface. Colors can include shades of green, blue-green, yellow, brown or red. If contact does occur, rinse thoroughly with clean water to remove algae.
  • Never drink untreated surface water, whether or not algae blooms are present. Untreated surface water may contain other bacteria, parasites or viruses, as well as cyanotoxins that could cause illness if consumed.
  • People not on public water supplies should not drink surface water during an algal bloom, even if it is treated, because in-home treatments such as boiling, disinfecting water with chlorine or ultraviolet (UV), and water filtration units do not protect people from HABs toxins.
  • Stop using water and seek medical attention immediately if symptoms such as vomiting, nausea, diarrhea, skin, eye or throat irritation, allergic reactions or breathing difficulties occur after drinking or having contact with blooms or untreated surface water.
  • Please report any health symptoms to your physician and NYS Department of Health at mailto:harmfulalgae@health.ny.gov or your local health department (link leaves DEC website).
  • For answers to other frequently asked questions go to the DEC HABs FAQ page.
  • If you suspect that you have seen a HAB or you, your family, or pet has been in contact with a bloom, please report the bloom to the DEC. Fill out and submit a Suspicious Algal Bloom Report Form (PDF, 764 KB). Email the completed form and, if possible, attach digital photos (close-up and landscape to show extent and location) of the suspected bloom to HABsInfo@dec.ny.gov.

For more information you contact your regional DEC office or:

DEC HABs Program Coordinator
Rebecca Gorney Ph.D., Division of Water
Phone: (518) 402-8179

Email the DEC HABs Program

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Sign up for MakingWaves, the Division of Water's weekly email subscription service to receive updates on HABs in New York waterbodies. MakingWaves provides information about important water-related issues, events, and news. To subscribe to MakingWaves, subscribe to GovDelivery (or see the box on the top of this page). When you reach the topics page, check the MakingWaves box under the Water category.