Harmful Hudson River Algae Bloom Spread Across NY Counties

Environmental experts are closely monitoring the Hudson River after several harmful algal blooms were confirmed this summer. The New York State Department of Environmental Conservation (DEC) is asking people to stay alert when spending time near the water.

Reports of harmful algal blooms, also called HABs, started showing up in August and September. According to the DEC, patches have been spotted along a wide stretch of the river, starting around Hudson and extending south through Ulster, Dutchess, and Orange counties. One of the more concerning blooms has appeared near Kingston, raising red flags because of its unusual size.

Harmful algal blooms happen when cyanobacteria, also known as blue-green algae, grow out of control. These bacteria are usually present in small amounts in most lakes and rivers, but warm weather, calm conditions, and extra nutrients in the water can cause them to multiply quickly. When that happens, thick green patches can form on the surface of the water.

The Hudson River blooms have mostly been seen in shallow areas along the shoreline. Some of the water has taken on a bright green color or a soupy appearance, which are both signs of a bloom.

State officials encourage anyone heading to the river to check the DEC’s harmful algal bloom tracker before going out. If you see discolored water or scum on the surface, it is best to keep people, pets, and livestock away and report it to the DEC.