Les Appalaches County Lake Quality
Québec, 12 lakes, average grade B (Good)
Les Appalaches County has 12 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. With an average grade of B, Les Appalaches County sits comfortably above the Québec median.
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 Breeches (A) is the cleanest in the county.
Quick Answers for Les Appalaches County
Planning a trip? Check special fishing regulations for Lac Breeches — or check the official Québec fishing regulations.
All Lakes in Les Appalaches County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Lac Breeches | A | 12.8 ft | 4.1 µg/L |
| 2 | Lac de L'Est | B | 9.5 ft | 9.9 µg/L |
| 3 | Lac à la Truite | B | 8.9 ft | 7.4 µg/L |
| 4 | Lac Aylmer | B | 7.2 ft | 11.5 µg/L |
| 5 | Petit Lac Saint-FrançOis | B | 3.9 ft | 14.1 µg/L |
| 6 | Lac du Huit | B | 6.6 ft | 13.5 µg/L |
| 7 | Lac Caribou | B | 3.6 ft | 17.9 µg/L |
| 8 | Lac Bolduc | C | 4.1 ft | 27.3 µg/L |
| 9 | Lac Rond | C | 3.3 ft | 21.3 µg/L |
| 10 | Lac BéCancour | C | 3.3 ft | 22.1 µg/L |
| 11 | Lac Noir | C | 3.6 ft | 29.5 µg/L |
| 12 | Lac à la Truite | D | 3 ft | 64.2 µg/L |
Other Counties in Québec
See how Les Appalaches 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 Les Appalaches County
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Source: EPA National Aquatic Resource Surveys, 2026.