Le Granit County Lake Quality
Québec, 10 lakes, average grade B (Good)
Only 10 lakes in Le Granit 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. Petit Lac Lambton (A) is the cleanest in the county.
Quick Answers for Le Granit County
Planning a trip? Check special fishing regulations for Petit Lac Lambton — or check the official Québec fishing regulations.
All Lakes in Le Granit County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Petit Lac Lambton | A | 13.8 ft | 7.4 µg/L |
| 2 | Lac ÉQuerre | A | 11 ft | 10.1 µg/L |
| 3 | Lac Elgin | A | 10.8 ft | 3.8 µg/L |
| 4 | Lac MéGantic | A | 12.1 ft | 6.1 µg/L |
| 5 | Lac Ruel | A | 13.5 ft | 7.8 µg/L |
| 6 | Lac des Trois Milles | B | 7.9 ft | 11.5 µg/L |
| 7 | Lac Thor | B | 14.4 ft | 7 µg/L |
| 8 | Grand Lac Saint-FrançOis | B | 8.9 ft | 9.8 µg/L |
| 9 | Lac Drolet | B | 9.8 ft | 10.1 µg/L |
| 10 | Lac Aux AraignéEs | B | 10.2 ft | - |
Other Counties in Québec
See how Le Granit 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.