Microcystin Data

Weekly microcystin toxin report

We've resumed weekly sampling! Results from our lab testing are available below.

If you already signed up for our microcystin toxin update emails, thank you! We’ll send reports to your inbox June-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 14 lakes and seven public beaches every week from June-August, and 12 streams biweekly year-round. Visit these excellent and educational resources to learn more about blue-green algae:


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 

LakesConcentration (ppb)
Beaver Dam Lake0.489
Yellow Creek LakeND
Winona LakeND
Center LakeND
Pike Lake0.249
Big Chapman Lake0.460
Big Barbee LakeND
Webster Lake0.465
Lake TippecanoeND
James LakeND
Oswego LakeND
Dewart Lake1.109
Lake Wawasee0.396
Syracuse Lake0.486
BeachConcentration (ppb)
Center Lake Beach0.162
Pike Lake Beach0.172
Syracuse Lake Beach - Community Center0.264
Syracuse Lake Beach - Hoy0.226
Waubee Lake Beach1.657
Webster Lake Beach0.299
Winona Lake BeachND

What's next?

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

The 2021 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.

Why & how the Lilly Center samples for microcystin

From June-August, the Lilly Center collects water samples from open water on Kosciusko County’s 12 all-sport lakes and Center and Pike 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.

Additional sampling on Lake Wawasee

Thanks to the support of two generous Lake Wawasee families, the Lilly Center sampled seven additional sites on Lake Wawasee during the summer of 2021. 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 

ADeepest Point0.396
BNorth Shore0.211
CConklin Bay0.338
DSouth Shore0.411
FJohnson Bay0.620
GJarrett's Bay0.444
HCrow Bay0.461

Discover more in Beneath the Surface 2021!

Collaboration with IDEM

Lilly Center algae sampling and analysis are coordinated with the Indiana Department of Environmental Management (IDEM) to ensure statewide data comparison and accuracy.

Visit IDEM's website