Unprecedented Hudson algal bloom clearing up
October 17, 2025
Recent cool, wet weather has helped flush the bloom from some parts of the river, particularly the Kingston area. However, Riverkeeper has documented recent (though very localized) HAB conditions in some tributaries, such as the Wallkill River and Rondout Creek. Recreational users should continue to exercise caution and avoid water contact where they see bright green patches or streaks. As a founding partner of the Hudson 7 — a coalition of cities and towns that draw their drinking water from the Hudson River — Riverkeeper worked closely with communities and water plant operators to ensure tap water remains safe.
Watch Riverkeeper’s recent Learning Session to learn about what harmful algal blooms are, why they matter, and what the bloom in the Hudson tells us about the river’s health.
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