Pontiac County Lake Quality
Ontario, 4 lakes, average grade C (Fair)
Only 4 lakes in Pontiac 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. Pontiac County averages to a C. The distribution behind that average matters more than the letter: a few stressed lakes versus many decent ones can produce the same average as the inverse.
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 Lac des Chats Lake (B); the most-stressed is Lac Coulonge Lake (D).
Quick Answers for Pontiac County
Planning a trip? Check special fishing regulations for Lac des Chats Lake — or check the official Ontario fishing regulations.
All Lakes in Pontiac County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Lac des Chats Lake | B | 6.2 ft | 16.4 µg/L |
| 2 | Lac du Rocher-Fendu Lake | B | 5.2 ft | 13 µg/L |
| 3 | Lower Allumette Lake | B | 4.8 ft | 16.2 µg/L |
| 4 | Lac Coulonge Lake | D | 5.2 ft | - |
Other Counties in Ontario
See how Pontiac County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 38 states.
Where to stay near Pontiac County
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Source: EPA National Aquatic Resource Surveys, 2026.