L'Islet County Lake Quality
Québec, 6 lakes, average grade B (Good)
Only 6 lakes in L'Islet 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, L'Islet County sits comfortably above the Québec median.
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 Fontaine Claire (A); the most-stressed is Lac Isidore (C).
Quick Answers for L'Islet County
Planning a trip? Check special fishing regulations for Lac Fontaine Claire — or check the official Québec fishing regulations.
All Lakes in L'Islet County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Lac Fontaine Claire | A | - | 9.9 µg/L |
| 2 | Lac Bringé | A | 11.5 ft | 6.3 µg/L |
| 3 | Lac Trois Saumons | B | 9.7 ft | 6.9 µg/L |
| 4 | Lac D'Apic | B | 5.2 ft | 10.8 µg/L |
| 5 | Lac des Plaines | B | 4.9 ft | 13.9 µg/L |
| 6 | Lac Isidore | C | 3 ft | 20.9 µg/L |
Other Counties in Québec
See how L'Islet 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.