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Harmful Algal Blooms (HABs) Notifications Page

2018 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 10/19/18.

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 10/16/18 Lab sample Updated Listing
2 Allegheny Reservoir* Cattaraugus Suspicious Not Reported 10/5/18 Visual Report No Change
3 Barger Pond Putnam Suspicious Widespread/Lakewide 10/7/18 Visual Report No Change
4 Barnum Pond Franklin Suspicious Small Localized 10/14/18 Visual Report Updated Listing
5 Beaver Dam Lake Orange Suspicious Small Localized 10/4/18 Visual Report No Change
6 Casterline Pond Cortland Confirmed Widespread/Lakewide 10/3/18 Lab sample No Change
7 Cayuta Lake Schuyler Suspicious Large Localized 10/3/18 Visual Report No Change
8 Chautauqua Lake* Chautauqua Suspicious Small Localized 10/19/18 Visual Report Updated Listing
9 Chestnut Ridge Pond Sullivan Suspicious Widespread/Lakewide 10/1/018 Visual Report No Change
10 Conesus Lake* Livingston Suspicious Large Localized 10/3/18 Visual Report No Change
11 Dead Lake Washington Suspicious Not Reported 10/14/18 Visual Report New
12 Duane Lake Schenectady Suspicious Open Water 10/10/18 Visual Report No Change
13 Fort Pond Suffolk Confirmed Large Localized 10/17/18 Lab sample Updated Listing
14 Georgica Pond Suffolk Confirmed Large Localized 10/17/18 Lab sample Updated Listing
15 Goose Pond Queens Confirmed with High Toxins Small Localized 10/16/18 Lab sample Updated Listing
16 Harlem Meer New York Confirmed Small Localized 10/15/18 Lab sample Updated Listing
17 Honeoye Lake* Ontario Confirmed Large Localized 10/15/18 Lab sample Updated Listing
18 Kissena Lake Queens Confirmed Small Localized 10/15/18 Lab sample Updated Listing
19 Lake Mohegan Westchester Suspicious Small Localized 10/3/18 Visual Report No Change
20 Lake Neatahwanta Oswego Confirmed Not Reported 10/15/18 Lab sample Updated Listing
21 Lake Oscaleta Westchester Suspicious Widespread/Lakewide 10/10/18 Visual Report No Change
22 Lake Rippowam Westchester Suspicious Small Localized 10/10/18 Visual Report No Change
23 Maratooka Lake Suffolk Confirmed with High Toxins Large Localized 10/2/18 Lab sample No Change
24 Mill Pond (Watermill) Suffolk Confirmed Widespread/Lakewide 10/16/18 Lab sample Updated Listing
25 Morningside Pond New York Confirmed Small Localized 10/16/18 Lab sample Updated Listing
26 Orange Lake Orange Confirmed Open Water 10/1/18 Lab sample No Change
27 Prospect Park Lake Kings Confirmed with High Toxins Widespread/Lakewide 10/15/18 Lab sample Updated Listing
28 Roth Pond Suffolk Confirmed Widespread/Lakewide 10/10/18 Lab sample No Change
29 Sagg Pond Suffolk Confirmed Not Reported 10/16/18 Lab sample Updated Listing
30 Saratoga Lake* Saratoga Suspicious Not Reported 10/10/18 Visual Report No Change
31 Sleepy Hollow Lake Greene Confirmed Not Reported 10/18/18 Lab sample Updated Listing
32 The Lake in Central Park New York Confirmed with High Toxins Widespread/Lakewide 10/15/18 Lab sample Updated Listing
33 Turtle Pond New York Confirmed Small Localized 10/15/18 Lab sample Updated Listing
34 Waneta Lake Schuyler, Steuben Suspicious Not Reported 10/7/18 Visual Report No Change
35 Washington Park Pond Albany Confirmed with High Toxins Widespread/Lakewide 9/19/18 Lab sample No Change
36 Wildwood Lake Suffolk Suspicious Small Localized 10/11/18 Visual Report 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 2018 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 2018 DEC Lake Monitoring Program (PDF, 146 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.