Maskinongé County Lake Quality
Québec, 32 lakes, average grade A (Excellent)
Maskinongé County's 32 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's average grade is A — among the cleanest in Québec. 19 lakes pull an A on their own, and almost none fall into the D or F brackets.
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 Plaisant (A); the most-stressed is Lac Bill (C).
Quick Answers for Maskinongé County
Planning a trip? Check special fishing regulations for Lac Plaisant — or check the official Québec fishing regulations.
All Lakes in Maskinongé County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Lac Plaisant | A | 17.1 ft | 4.7 µg/L |
| 2 | Lac des Souris | A | 16.6 ft | 4.3 µg/L |
| 3 | Lac Goulet | A | 18 ft | 2.6 µg/L |
| 4 | Lac En Croix | A | 16.4 ft | 3.5 µg/L |
| 5 | Lac Barnard | A | 17.1 ft | 3.5 µg/L |
| 6 | Lac Droit | A | 15.7 ft | 4 µg/L |
| 7 | Lac Gauche | A | 21 ft | 2.6 µg/L |
| 8 | Lac Vert | A | 23.6 ft | 3 µg/L |
| 9 | Lac Lambert | A | 15.4 ft | 3.2 µg/L |
| 10 | Lac des Pins Rouges | A | 15.6 ft | 3.9 µg/L |
| 11 | Lac Larose | A | 15.1 ft | 5.6 µg/L |
| 12 | Lac Lambert | A | 18.7 ft | 4.6 µg/L |
| 13 | Petit Lac Long | A | 19.2 ft | 4.2 µg/L |
| 14 | Grand Lac Long | A | 20.7 ft | 3.4 µg/L |
| 15 | Lac Gareau | A | 23 ft | 2.9 µg/L |
| 16 | Lac Bellemare | A | 11.5 ft | 6.9 µg/L |
| 17 | Lac des ÉRables | A | 14.3 ft | 5.2 µg/L |
| 18 | Lac Bell | A | 13 ft | 5 µg/L |
| 19 | Lac des ÎLes | A | 11.2 ft | 5.4 µg/L |
| 20 | Lac HéRoux | B | 9.8 ft | 7.8 µg/L |
| 21 | Lac Magnan | B | 9.2 ft | 6.9 µg/L |
| 22 | Lac des Amoureux | B | 7.9 ft | 5.9 µg/L |
| 23 | Lac Saint-Alexis | B | 7.5 ft | 8.8 µg/L |
| 24 | Lac Jackson | B | 9.8 ft | 7.8 µg/L |
| 25 | Lac Gauthier | B | 8.2 ft | 8.7 µg/L |
| 26 | Lac BrûLé | B | 8.2 ft | 13.1 µg/L |
| 27 | Lac de la Vase | B | 6.6 ft | 7.3 µg/L |
| 28 | Lac à la Perchaude | B | 7.2 ft | 13.3 µg/L |
| 29 | Petit Lac Rose | B | 4.9 ft | 11.3 µg/L |
| 30 | Lac à la PêChe | B | 5.9 ft | 12.3 µg/L |
| 31 | Lac des Six | B | 6.6 ft | 13.5 µg/L |
| 32 | Lac Bill | C | 4.3 ft | 21 µg/L |
Other Counties in Québec
See how Maskinongé 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.