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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 9/22/17.

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 9/11/17 Lab sample

No change

2 Allegheny Reservoir* Cattaraugus Confirmed Widespread/Lakewide 9/12/17 Lab sample

No change

3 Avon Marsh Dam Pond Livingston Confirmed Widespread/Lakewide 9/20/17 Lab sample New
4 Ballston Lake Saratoga Suspicious Not reported 9/6/17 Visual report No change
5 Basic Creek Reservoir Albany Suspicious Large localized 9/22/17 Visual report Updated listing
6 Beaver Dam Lake Orange Suspicious Widespread/Lakewide 9/22/17 Visual report

Updated listing

7 Bedford Lake Westchester Confirmed Open Water 9/10/17 Lab sample

No change

8 Brooks Lake Orange Suspicious Not reported 9/7/17 Visual report No change
9 Browns Pond Orange Suspicious Not reported 9/22/17 Visual report New
10 Canandaigua Lake* Ontario, Yates Confirmed with High Toxins Small localized 9/18/17 Lab sample

Updated listing

11 Cayuga Lake* Cayuga, Seneca, Tompkins Confirmed Large localized 9/20/17 Lab sample

Updated listing

12 Cayuta Lake Schuyler Confirmed with High Toxins Small localized 9/13/17 Lab sample

Updated listing

13 Chautauqua Lake* Chautauqua Confirmed with High Toxins Widespread/Lakewide 9/18/17 Lab sample

Updated listing

14 Conesus Lake* Livingston Suspicious Small localized 9/14/17 Visual report

No change

15 Craine Lake Madison Confirmed Not reported 9/19/17 Lab sample New
16 Deans Pond Cortland Confirmed with High Toxins Open water 9/4/17 Lab sample

No change

17 DeRuyter Reservoir Madison, Onondaga Suspicious Widespread/Lakewide 9/20/17 Visual report

Updated listing

18 Duane Lake Schenectady Confirmed Open water 9/16/17 Lab sample New
19 Eagle Pond Franklin Confirmed Small localized 9/3/17 Lab sample No change
20 Findley Lake Chautuaqua Confirmed Small localized 9/11/17 Lab sample

No change

21 Forest Lake Niagara Confirmed Not reported 9/14/17 Lab sample

No change

22 Hiawatha Lake Onondaga Confirmed with High Toxins Large localized 9/18/17 Lab sample New
23 Honeoye Lake* Ontario Confirmed Small localized 9/18/17 Lab sample

Updated listing

24 Indian Lake Bronx Confirmed Widespread/Lakewide 9/20/17 Lab sample

Updated listing

25 Java Lake Wyoming Confirmed Widespread/Lakewide 9/11/17 Lab sample

No change

26 Keuka Lake* Steuben, Yates Confirmed with High Toxins Small localized 9/14/17 Lab sample

Updated listing

27 Lake Casse Putnam Suspicious Small localized 9/1/17 Visual report No change
28 Lake Neatahwanta Oswego Confirmed Not reported 9/12/17 Lab sample

No change

29 Lawson Lake Albany Confirmed Widespread/Lakewide 9/11/17 Lab sample

No change

30 Lime Lake Cattaraugus Confirmed Not reported 9/18/17 Lab sample New
31 Mill Pond (Watermill) Suffolk Confirmed Widespread/Lakewide 9/12/17 Lab sample

No change

32 Montgomery Lake Sullivan Confirmed Large localized 9/3/17 Lab sample No change
33 Nassau Lake Rensselaer Suspicious Open water 9/14/17 Visual report

No change

34 New Croton Reservoir* Westchester Suspicious Small localized 9/18/17 Visual report New
35 Newark Reservoir Ontario Confirmed Large localized 9/19/17 Lab sample New
36 Oakland Lake Queens Confirmed Small localized 9/5/17 Lab sample No change
37 Orange Lake Orange Confirmed Open water 9/10/17 Lab sample

No change

38 Owasco Lake* Cayuga Confirmed with High Toxins Widespread/Lakewide 9/19/17 Lab sample

Updated listing

39 Peach Lake Putnam, Westchester Confirmed Not reported 9/17/17 Lab sample

Updated listing

40 Pleasure Lake Sullivan Confirmed Small localized 9/17/17 Lab sample New
41 Plymouth Reservoir Chenango Confirmed Large localized 9/18/17 Lab sample

Updated listing

42 Prospect Park Lake Kings Confirmed with High Toxins Widespread/Lakewide 9/18/17 Lab sample

Updated listing

43 Putnam Lake Putnam Confirmed Open water 9/4/17 Lab sample No change
44 Roaring Brook Lake Putnam Confirmed with High Toxins Small localized 9/17/17 Lab sample

Updated listing

45 Rockland Lake Rockland Suspicious Small localized 9/21/17 Visual report New
46 Roth Pond Suffolk Confirmed with High Toxins Widespread/Lakewide 9/18/17 Lab sample

Updated listing

47 Round Lake Saratoga Confirmed Small localized 9/12/17 Lab sample

No change

48 Saggaponack Pond Suffolk Confirmed Large localized 9/12/17 Lab sample

No change

49 Saratoga Lake* Saratoga Suspicious Large localized 9/22/17 Visual report New
50 Seneca Lake* Multiple Confirmed Widespread/Lakewide 9/21/17 Lab sample

Updated listing

51 Sidney Reservoir Chenango Suspicious Not reported 9/22/17 Visual report New
52 Silver Lake Wyoming Confirmed Open water 9/9/17 Lab sample

No change

53 Skaneateles Lake* Onondaga, Cayuga, Cortland Confirmed with High Toxins Large localized 9/16/17 Lab sample

Updated listing

54 Song Lake Cortland Confirmed Not reported 9/10/17 Lab sample

No change

55 Spring Lake Suffolk Confirmed Widespread/Lakewide 9/14/17 Lab sample

No change

56 Stony Brook Duck Pond Suffolk Confirmed Widespread/Lakewide 9/14/17 Lab sample

No change

57 Summit Lake Washington Confirmed Not reported 9/4/17 Lab sample No change
58 The Lake in Central Park New York Confirmed with High Toxins Widespread/Lakewide 9/18/17 Lab sample

Updated listing

59 Thunder Lake Chenango Suspicious Large localized 9/18/17 Visual report New
60 Tully Lake Cortland, Onondaga Suspicious Small localized 9/20/17 Visual report

Updated listing

61 Turtle Pond New York Confirmed with High Toxins Small localized 9/18/17 Lab sample

Updated listing

62 Unnamed pond near Orchard Park Erie Suspicious Small localized 9/20/17 Visual report New
63 Wainscott Pond Suffolk Confirmed Widespread/Lakewide 9/11/17 Lab sample

No change

64 Waneta Lake* Schuyler, Steuben Suspicious Widespread/Lakewide 9/22/17 Visual report New
65 Washington Park Pond Albany Confirmed Small localized 9/20/17 Lab sample New

*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.