A toxic algae bloom has been spotted at a lake near Warsaw.

Cyanobacteria, also known as blue-green algae, was discovered by a resident at Big Chapman Lake and reported to The Lilly Center, which confirmed it with testing. WSBT reports that the bacteria, which isn’t actually an algae at all, has the ability to produce a toxin that presents a danger to people and pets.

The Lilly Center says the bacteria is already starting to break down, and much of the lake is safe for swimming. It resembles pea soup or a paint spill in the water.