Microcystin Data

If you already signed up for our microcystin toxin update emails, thank you! We’ll send reports to your inbox May-August. If you haven’t, what are you waiting for? They will remind you to check this page to see which lakes have microcystin detected, and at what levels.

Supported by the K21 Health Foundation, we sample 16 lakes and seven public beaches every week from June-August, and 14 streams biweekly year-round. Visit these excellent and educational resources to learn more about blue-green algae:

• The Lilly Center’s ultimate guide to blue-green algae
• Why nutrients cause algae to bloom and weeds to grow
• Indiana Department of Environmental Management’s guidelines

IDEM’s safety threshold is 8.0 ppb for humans and 0.8 ppb for pets.

ND – None Detected

– – –  Data unavailable for this sampling week 

*See spatial variability results below.

Thanks to the support of two generous Lake Wawasee families, the Lilly Center samples seven additional sites on Lake Wawasee during the summer of 2024. All water samples from these sites were tested for microcystin.

IDEM’s safety threshold is 8.0 ppb for humans and 0.8 ppb for pets.

ND – None Detected

– – –  Data unavailable for this sampling week

Every October, we publish Beneath the Surface, a report on our summer research as compared to the two previous years.

The 2025 edition includes a spread dedicated to blue-green algae (and microcystin) analysis! If you’re curious about what we learned over the course of the summer, make sure to grab a digital copy.

From June-August, the Lilly Center collects water samples from open water on Kosciusko County’s 12 all-sport lakes and Center, Pike, Waubee, and Silver lakes, along with public swimming beaches at these lakes:

• Center
• Pike
• Syracuse
• Waubee
• Webster
• Winona

Samples are processed and analyzed for microcystin, a toxin produced by blue-green algae. If ingested or left on the skin for too long, microcystin can cause health problems for people and pets. It’s especially dangerous for animals, like dogs.

Toxin results are updated on this page every week during the summer. To learn more about microcystin and pet and human health, visit our blue-green algae research hub!

As a general guideline, don’t recreate in water that has a blue-green algae bloom! Blooms often look like a green paint slick on the surface or a pea-soup appearance. If you see a bloom (or aren’t sure if it’s a bloom) email us the date, time, location and a picture and a team member will follow up with you.