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Concerns are rising as harmful algae blooms, known as cyanobacteria, have been detected in the Hudson River, particularly from Kingston to Norrie Point in Staatsburg. According to the Cary Institute of Ecosystem Studies, this is the largest bloom observed in nearly 40 years of monitoring. The New York State Department of Environmental Conservation (NYS DEC) has confirmed additional blooms near Beacon, Hyde Park, Tivoli, and Hudson, as well as in the Wallkill River and Rondout Creek, which feed into the Hudson near Kingston.
The blooms consist of Microcystis, a type of cyanobacteria that can produce toxins harmful to humans, pets, and wildlife. Cary Institute researchers noted that in slower-moving river parts, the water appeared coated with green, paint-like swirls. The blooms pose a threat to drinking water, prompting close monitoring by the Hudson River Drinking Water Intermunicipal Council, also known as the Hudson 7, and other agencies.
Dan Shapley, Riverkeeper’s Senior Director of Advocacy Policy & Planning, emphasized the importance of understanding and preparing for the impacts of climate change on water sources. The blooms are believed to be exacerbated by warmer temperatures and nutrient runoff from agriculture and wastewater. The region has also experienced drought conditions, which may have contributed to the blooms.
Residents and visitors are advised to avoid contact with affected waters, as exposure can cause skin irritation, stomach upset, and, in severe cases, damage to the liver or neurological system. Dogs are particularly at risk, as they may drink contaminated water. The public is encouraged to report sightings of algal blooms using the NYS DEC’s Suspicious Algal Bloom Report Form.