Mékinac County Lake Quality
Québec, 25 lakes, average grade B (Good)
Mékinac County's 25 graded lakes fall in the moderate-density bracket for Québec. The county-level average smooths over real differences — a single agricultural watershed near the southwest corner can pull the average down even if the rest of the county runs clean. 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 du Missionnaire Sud (A); the most-stressed is Lac Pierre-Paul (C).
Quick Answers for Mékinac County
Planning a trip? Check special fishing regulations for Lac du Missionnaire Sud — or check the official Québec fishing regulations.
All Lakes in Mékinac County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Lac du Missionnaire Sud | A | 15.7 ft | 3.7 µg/L |
| 2 | Lac du Missionnaire | A | 17.2 ft | 3 µg/L |
| 3 | Lac Aux Sables | A | 22 ft | 2.2 µg/L |
| 4 | Lac des AméRicains | A | 19.5 ft | 3.1 µg/L |
| 5 | Lac BrûLé | A | 20.2 ft | 3.2 µg/L |
| 6 | Lac du JéSuite | A | 16.2 ft | 4.1 µg/L |
| 7 | Lac Trottier | A | 23.6 ft | 7.7 µg/L |
| 8 | Lac à la Roche | A | - | 9.8 µg/L |
| 9 | Lac à la Truite | A | - | 9 µg/L |
| 10 | Lac à la Perchaude | A | 12.1 ft | 6.9 µg/L |
| 11 | Lac Archange | A | 10.5 ft | 5.2 µg/L |
| 12 | Lac Croche | A | 10.7 ft | 6.7 µg/L |
| 13 | Lac du Castor | A | 11.2 ft | 5.5 µg/L |
| 14 | Lac Georges | A | 12.8 ft | 5.7 µg/L |
| 15 | Lac Charest | B | 9.2 ft | 7 µg/L |
| 16 | Lac MéKinac | B | 8.9 ft | 6.6 µg/L |
| 17 | Lac Noir | B | 9.8 ft | 5 µg/L |
| 18 | Lac des Pins | B | 9 ft | 8.4 µg/L |
| 19 | Lac Trois Milles | B | 8.5 ft | 8.4 µg/L |
| 20 | Lac Veillette | B | 6.2 ft | 10.4 µg/L |
| 21 | Lac Huron | B | 6.4 ft | 8.5 µg/L |
| 22 | Lac Traverse | B | 9.8 ft | 10.5 µg/L |
| 23 | Lac Froid | B | 3.9 ft | 11.2 µg/L |
| 24 | Lac Pierre-Paul | C | 5.9 ft | 15.5 µg/L |
| 25 | Lac des Chicots | C | 4.9 ft | 19.3 µg/L |
Other Counties in Québec
See how Mékinac County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 38 states.
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Source: EPA National Aquatic Resource Surveys, 2026.