Les Basques County Lake Quality
Québec, 2 lakes, average grade B (Good)
Les Basques County has 2 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 Basques 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 Saint-Mathieu (B); the most-stressed is Petit Lac Saint-Mathieu (B).
Quick Answers for Les Basques County
Planning a trip? Check special fishing regulations for Lac Saint-Mathieu — or check the official Québec fishing regulations.
All Lakes in Les Basques County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Lac Saint-Mathieu | B | 7.5 ft | 8.6 µg/L |
| 2 | Petit Lac Saint-Mathieu | B | 5.2 ft | 12.6 µg/L |
Other Counties in Québec
See how Les Basques 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 Basques County
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Source: EPA National Aquatic Resource Surveys, 2026.