Mille Lacs County Lake Quality
Minnesota, 9 lakes, average grade B (Good)
Only 9 lakes in Mille Lacs County carry an active grade. The county-level summary is therefore representative of those specific lakes, not necessarily of every water body in the county. With an average grade of B, Mille Lacs County sits comfortably above the Minnesota median.
Most of the county's monitored lakes are shallow — under 50 feet — which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed. Ml-Vineland Lake (A) is the cleanest in the county.
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Quick Answers for Mille Lacs County
Planning a trip? Check special fishing regulations for Ml-Vineland Lake, whether the fish are safe to eat, and the best times to fish — or browse the full Minnesota regulations index.
Fishing in Mille Lacs County
DNR Reports (6)
Minnesota DNR LakeFinder resources for lakes in Mille Lacs County. browse all reports →
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — OnamiaFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — OgechieFisheries Lake Survey · MN DNR LakeFinder
- —Aquatic Plant Report — Ogechie (0340)Aquatic Plant Report · MN DNR LakeFinder
- —Aquatic Plant Report — Onamia (0341)Aquatic Plant Report · MN DNR LakeFinder
- —Aquatic Plant Report — Silver (0299)Aquatic Plant Report · MN DNR LakeFinder
- —Public Water Access Sites — SilverPublic Water Access Sites · MN DNR LakeFinder
All Lakes in Mille Lacs County
9 lakes · 7 graded, 2 not rated7 graded lakes · 2 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Max Depth | Access |
|---|---|---|---|---|---|---|---|---|
| 1 | AMl-Vineland LakeMille Lacs | A | 7.8 ft | 24 µg/L | 5.1 µg/L | No recent samples | 42 ft | ✓ Public |
| 2 | AMl-Malone LakeMille Lacs | A | 5.7 ft | 24 µg/L | 4.4 µg/L | No recent samples | 42 ft | ✓ Public |
| 3 | AOutlet of Onamia Lake on the Rum RiverMille Lacs | A | No recent samples | 21.8 µg/L | 0.6 µg/L | No recent samples | 10 ft | ✓ Public |
| 4 | CMl-Thains LakeMille Lacs | C | 5.3 ft | 27 µg/L | 3.9 µg/L | No recent samples | 42 ft | ✓ Public |
| 5 | CMl-Se LakeMille Lacs | C | 7.4 ft | 25.8 µg/L | 5.6 µg/L | No recent samples | 42 ft | ✓ Public |
| 6 | CMl-Peterson LakeMille Lacs | C | 7.4 ft | 26 µg/L | 3.9 µg/L | No recent samples | 42 ft | ✓ Public |
| 7 | COutlet of Ogechie Lake on the Rum RiverMille Lacs | C | No recent samples | 25.4 µg/L | 0.3 µg/L | No recent samples | 6 ft | ✓ Public |
| NRMille Lacs LakeMille Lacs | NR | 9 ft | No recent samples | No recent samples | No recent samples | 42 ft | ✓ Public | |
| NRSilver LakeMille Lacs | NR | 1 ft | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public |
NR = not rated: the monitoring record does not meet the evidence bar for a grade. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.
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Other Counties in Minnesota
See how Mille Lacs County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 39 states and 2 Canadian provinces.
Source: EPA National Aquatic Resource Surveys, 2026.