E. coli Data
Bi-Weekly E. coli Report
E. coli data is updated weekly by the Lilly Center’s research team. We sample 14 streams every other week, all year round, and 7 beaches during the summer. You can learn more about E. coli by visiting these educational resources:
Weekly Results: Streams
The EPA’s safety threshold is 235 CFU/100 mL
ND – None Detected
– – – Data unavailable for this sampling week
| Testing Site | Date Last Sampled | CFU/100 mL |
|---|---|---|
| Winona Lake Inflow: Peterson Ditch | 10/7/2025 | 2,500 |
| Winona Lake Inflow: Keefer-Evans | 10/7/2025 | 2,500 |
| Winona Lake Inflow: Cherry Creek | 10/7/2025 | 2,500 |
| Winona Lake Outflow: Eagle Creek | 10/7/2025 | 86.2 |
| Pike Lake Inflow: Deeds Creek | 10/7/2025 | 488.4 |
| Pike Lake Outflow: Lones Ditch | 10/7/2025 | 60.9 |
| Tippy Chain Inflow: Grassy Creek | 10/15/2025 | 4.1 |
| Tippy Chain Inflow: Tippecanoe River | 10/15/2025 | 387.3 |
| Tippy Chain Outflow: Tippecanoe River | 10/15/2025 | 6.3 |
| Wawasee-Syracuse Inflow: Papakeechie | 10/14/2025 | 8.4 |
| Wawasee-Syracuse Inflow: Turkey Creek | 10/14/2025 | 118.7 |
| Wawsee-Syracuse: Inflow: Dillon Creek | 10/14/2025 | 248.9 |
| Wawsee-Syracuse Inflow: Launer's Creek | 10/14/2025 | 770.1 |
| Wawasee-Syracuse Outflow: Turkey Creek | 10/14/2025 | 118.7 |
Weekly Results: Beaches
The EPA’s safety threshold is 235 CFU/100 mL
ND – None Detected
– – – Data unavailable for this sampling week
Beach sampling resumes May, 2026.
How does the Lilly Center test for E. coli?
The field research team collects water samples in sterile jars from streams and beaches. They use a gloved hand and a pole to collect the sample from upstream of where they are standing to avoid contamination from other sources. These samples are kept in a cooler to prevent the quantity of E. coli from changing while it is transported back to the Lilly Center’s research lab.
Matt Burlingame
Assistant Director of Research
burlinmn@grace.edu 574-372-5287Bio
Full data reports are available by contacting the Lilly Center’s assistant director of research, Matt Burlingame.