Manitoulin District County Lake Quality
Ontario, 13 lakes, average grade B (Good)
Only 13 lakes in Manitoulin District 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. The county-wide average lands at B — solid water quality with most lakes carrying clear summer transparency and low-to-moderate phosphorus.
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. Kagawong Lake (A) is the cleanest in the county.
Quick Answers for Manitoulin District County
Planning a trip? Check special fishing regulations for Kagawong Lake — or check the official Ontario fishing regulations.
All Lakes in Manitoulin District County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Kagawong Lake | A | 24.4 ft | 7.1 µg/L |
| 2 | Manitou Lake | A | 21.3 ft | 6.8 µg/L |
| 3 | Nameless Lake | A | 16.1 ft | 4.1 µg/L |
| 4 | North Channel Lake | A | 16.4 ft | 8.8 µg/L |
| 5 | South Bay Lake | A | - | 3.6 µg/L |
| 6 | Kagawong Lake | A | 17.1 ft | 5.3 µg/L |
| 7 | Mindemoya Lake | A | 13.6 ft | 7.2 µg/L |
| 8 | Tobacco Lake | A | 10.5 ft | 6.3 µg/L |
| 9 | Windfall Lake | A | 14.8 ft | 7.2 µg/L |
| 10 | Big Lake | B | 9.2 ft | 7.5 µg/L |
| 11 | Wolsey Lake | B | 9.2 ft | 10.6 µg/L |
| 12 | Ice Lake | B | 6.6 ft | 11.9 µg/L |
| 13 | Clapperton Channel Lake | C | 9.8 ft | - |
Other Counties in Ontario
See how Manitoulin District County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 38 states.
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Source: EPA National Aquatic Resource Surveys, 2026.