Harmful Algal Blooms (HABs) Notifications Page
The map below displays the location of current HABs in New York State. Each location is labeled with a number that corresponds to the information in the table below.
There may be other waterbodies with blooms that have not been reported to the DEC.
This page provides information about the status of waterbodies with HABs. The information is collected through the 2016 DEC Lake Monitoring Program, Citizen Statewide Lake Assessment Program volunteers, partner HABs monitoring programs and from public reports.
Regulated swimming beaches are monitored regularly and evaluated for the presence of HABs. For information about regulated swimming beaches contact your local health department.
DEC encourages the public to view the HABs Archive page to be aware of lakes that were listed on the notification web page in previous years or removed from the current notification map.
For information about HABs on Lake Champlain, visit the Lake Champlain Committee monitoring page and the Vermont Department of Health's blue-green algae notification page (above two links leave DEC website.)
Map and table information is updated weekly.
This page was updated on 6/24/2016. DEC encourages the public to view the archive reports table to be aware of lakes that have been removed from the notification map.
|Map Number||Waterbody Name||County||Bloom Status||Extent of Bloom||Status Date||Type of Report||Change in Status|
|1||Agawam Lake||Suffolk||Confirmed||Large Localized||6/21/16||Lab sample||Updated Listing|
|2||Andover Pond||Allegany||Suspicious||Widespread||6/15/16||Visual report||New|
|3||Avon Marsh Dam Pond||Livingston||Confirmed with High Toxins||Small Localized||6/20/16||Visual report||Updated Listing|
|4||Beaver Dam Lake||Orange||Confirmed||Large Localized||6/20/16||Lab sample||New|
|5||Bowne Pond||Queens||Confirmed||Large Localized||6/14/16||Lab sample||No Change|
|6||Conesus Lake*||Livingston||Suspicious||Small Localized||6/15/16||Lab sample||New|
|7||Craine Lake||Madison||Suspicious||Small Localized||6/20/16||Visual report||New|
|8||Deans Pond||Cortland||Confirmed||Widespread/Lakewide||6/18/16||Lab sample||Updated Listing|
|9||Indian Lake||Bronx||Confirmed||Large Localized||6/22/16||Lab sample||New Listing|
|10||Lake Ronkonkoma*||Suffolk||Confirmed||Small Localized||6/22/16||Lab sample||Updated Listing|
|11||Marratooka Lake||Suffolk||Confirmed with High Toxins||Widespread/Lakewide||6/20/16||Lab sample||Updated Listing|
|12||Mill Pond (Watermill)||Suffolk||Confirmed with High Toxins||Widespread/Lakewide||6/21/16||Lab sample||Updated Listing|
|13||Montgomery Lake||Sullivan||Confirmed||Not reported||6/19/16||Lab sample||Updated Listing|
|14||Moon Lake||Jefferson||Suspicious||Large Localized||6/23/16||Visual report||New|
|15||Old Town Pond||Suffolk||Confirmed||Widespread/Lakewide||6/21/16||Lab sample||New|
|16||Prospect Park Lake||Kings||Confirmed with High Toxins||Small Localized||6/21/16||Lab sample||Updated Listing|
|17||The Lake in Central Park||New York||Confirmed with High Toxins||Widespread/Lakewide||6/22/16||Lab sample||Updated Listing|
|18||Turtle Pond||New York||Confirmed||Widespread/Lakewide||6/22/16||Lab sample||New|
|19||Warners Lake||Albany||Confirmed||Small Localized||6/22/16||Lab sample||New|
* blooms in large lakes may be limited to specific shorelines or confined bays. Portions of any of these lakes 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.
The 2016 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 2016 DEC Lake Monitoring Program, contact the Division of Water at 518-402-8179.
Lake Champlain blooms are not reported here. For information about blue-green algae on Lake Champlain, visit the Lake Champlain Committee monitoring page and the Vermont Department of Health's blue-green algae notification page (above two links leave DEC website.)
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 About HABs
- If you see it - avoid 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:firstname.lastname@example.org or your local health department.
- 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, 782 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
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