Protect & Educate
Harmful Algal Blooms
Know it. Avoid it. Report it. Most blooms pass in days, but they can make people and pets sick.
Last updated Oct 23, 2026 · 12:45 PM
Current status:Bloom reported – north basin
If you see a bloom
Know it
Green, blue or brown scum. Looks like paint or pea soup.
Avoid it
Don't swim, wade or drink. Rinse off with clean water.
Protect pets
Dogs are most at risk. Keep them on a leash and out.
Report it
Photo + location to cconnolly@slpidny.gov or 518-223-3252.
Quick answers
What is a harmful algal bloom?
A HAB is a fast growth of cyanobacteria (blue-green algae) that can make toxins. It often looks like spilled paint, pea soup or green scum.
Is it safe to swim?
Not near a bloom. If the water looks discolored or scummy, stay out and keep kids and pets out too.
How do I report a bloom?
Take a photo and send it with the location to cconnolly@slpidny.gov or call 518-223-3252.