La Matanie County Lake Quality
Québec, 4 lakes, average grade A (Excellent)
Only 4 lakes in La Matanie 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's average grade is A — among the cleanest in Québec. 3 lakes pull an A on their own, and almost none fall into the D or F brackets.
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. Lac Towago (A) is the cleanest in the county.
Quick Answers for La Matanie County
Planning a trip? Check special fishing regulations for Lac Towago — or check the official Québec fishing regulations.
All Lakes in La Matanie County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Lac Towago | A | 14.9 ft | 7.4 µg/L |
| 2 | Lac du Portage | A | 14.4 ft | 5.3 µg/L |
| 3 | Lac Chaud | A | 14.1 ft | 7.2 µg/L |
| 4 | Lac des ÎLes | B | 5.9 ft | 13.4 µg/L |
Other Counties in Québec
See how La Matanie 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 La Matanie County
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Source: EPA National Aquatic Resource Surveys, 2026.