Sometimes, the lakes turn green and not in a good way. That’s harmful algae (also called HABs), and it can make water unsafe for people, pets, and wildlife. UW Oshkosh, the Fox-Wolf Watershed Alliance, and other partners are working together to track harmful algae, understand what causes it, and help prevent it.

Want to see what’s happening near you or add your own report?
Check out the HAB monitoring app to explore recent sightings and share what you see.
Then scroll down for more info, fun activities, and ways to get involved.