Unorganized Division No. 1 County Lake Quality
Ontario, 1 lakes, average grade A (Excellent)
Unorganized Division No. 1 County has 1 graded lakes — a thin enough sample that one or two stressed lakes can move the county average noticeably. Use the per-lake pages below for what actually matters. On average, Unorganized Division No. 1 County lakes grade an A. That puts it near the top of the Ontario county ranking.
The county's lakes lean shallow, which makes the grades sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest lake on the books is Little Pickerel Lake (A); the most-stressed is Little Pickerel Lake (A).
Quick Answers for Unorganized Division No. 1 County
Planning a trip? Check special fishing regulations for Little Pickerel Lake — or check the official Ontario fishing regulations.
All Lakes in Unorganized Division No. 1 County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Little Pickerel Lake | A | - | 14 µg/L |
Other Counties in Ontario
See how Unorganized Division No. 1 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.