Is Ml-Peterson Lake Safe for Swimming?
Ml-Peterson Lake in Mille Lacs County, Minnesota has a water quality grade of A (Excellent). Excellent for swimming, crystal clear water with minimal algae. Water clarity: 20.2 ft visibility. Phosphorus: 26.5 µg/L. Chlorophyll-a (algae): 4.1 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | A (Excellent) |
| Water Clarity (Secchi Depth) | 20.2 ft |
| Phosphorus | 26.5 μg/L |
| Chlorophyll-a (Algae) | 4.1 μg/L |
| Maximum Depth | 42 ft |
| Location | Mille Lacs County, Minnesota |
How does Ml-Peterson Lake compare?
With an overall water quality grade of A, Ml-Peterson Lake matches or beats the Minnesota state average of Grade C. It ranks #5 of 11 lakes in Mille Lacs County by water quality score.
Water clarity (Secchi depth) sits at 20.2 feet. That counts as exceptional clarity — sunlight penetrates deep, supporting submerged plants and limiting algae. Algae levels (chlorophyll-a) measure 4.1 µg/L — low and well within safe swimming guidelines.