Estrie County Lake Quality
Québec, 1 lakes, average grade A (Excellent)
Estrie County has 1 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. On average, Estrie County lakes grade an A. That puts it near the top of the Québec county ranking.
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 Magog (A); the most-stressed is Lac Magog (A).
Quick Answers for Estrie County
Planning a trip? Check special fishing regulations for Lac Magog — or check the official Québec fishing regulations.
All Lakes in Estrie County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Lac Magog | A | 11.5 ft | 11 µg/L |
Other Counties in Québec
See how Estrie 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 Estrie County
Top-rated places to stay near Estrie County
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Source: EPA National Aquatic Resource Surveys, 2026.