Coaticook County Lake Quality
Québec, 3 lakes, average grade B (Good)
Coaticook County has 3 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. The county-wide average lands at B — solid water quality with most lakes carrying clear summer transparency and low-to-moderate phosphorus.
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 Lyster (A); the most-stressed is Lac Lindsay (D).
Quick Answers for Coaticook County
Planning a trip? Check special fishing regulations for Lac Lyster — or check the official Québec fishing regulations.
All Lakes in Coaticook County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Lac Lyster | A | 21 ft | 3.4 µg/L |
| 2 | Lac Wallace | A | 10.8 ft | 8.2 µg/L |
| 3 | Lac Lindsay | D | 3.9 ft | 37.1 µg/L |
Other Counties in Québec
See how Coaticook 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 Coaticook County
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Source: EPA National Aquatic Resource Surveys, 2026.