La Vallée-de-la-Gatineau County Lake Quality
Québec, 36 lakes, average grade A (Excellent)
There are 36 graded lakes in La Vallée-de-la-Gatineau County. The mix is varied enough that the county-level average tells you the broad strokes, not the choose-this-cabin specifics. On average, La Vallée-de-la-Gatineau 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 Petit Lac des CèDres (A); the most-stressed is Lac DéSormeaux (B).
Quick Answers for La Vallée-de-la-Gatineau County
Planning a trip? Check special fishing regulations for Petit Lac des CèDres — or check the official Québec fishing regulations.
All Lakes in La Vallée-de-la-Gatineau County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Petit Lac des CèDres | A | 18.9 ft | 5.6 µg/L |
| 2 | Lac Blue Sea | A | 21.3 ft | 4.6 µg/L |
| 3 | Lac Paquin | A | 30.8 ft | 3.1 µg/L |
| 4 | Lac à la Truite | A | 17.4 ft | 8.9 µg/L |
| 5 | Lac du Cardinal | A | 18.7 ft | 4.6 µg/L |
| 6 | Grand Lac des CèDres | A | 19.7 ft | 5.2 µg/L |
| 7 | Lac Edja | A | 24.3 ft | 5.2 µg/L |
| 8 | Lac Long | A | 15.4 ft | 6.7 µg/L |
| 9 | Lac Northfield | A | 16.9 ft | 6.2 µg/L |
| 10 | Lac des Trente Et Un Milles | A | 23.3 ft | 3.8 µg/L |
| 11 | Lac Cayamant | A | 21.5 ft | 4.3 µg/L |
| 12 | Lac Perreault | A | 16.1 ft | 5.9 µg/L |
| 13 | Grand Lac Rond | A | 21.5 ft | 3.8 µg/L |
| 14 | Lac Pemichangan | A | 24.1 ft | 4.5 µg/L |
| 15 | Lac des ÎLes | A | 17.2 ft | 5.9 µg/L |
| 16 | Lac Profond | A | 27.1 ft | 3.4 µg/L |
| 17 | Lac à Beaudry | A | 20 ft | 5.4 µg/L |
| 18 | Lac Bois Franc | A | 16.4 ft | 5.6 µg/L |
| 19 | Lac Rond | A | 23 ft | 4.7 µg/L |
| 20 | Lac Roberge | A | 21.3 ft | 4.3 µg/L |
| 21 | Lac Grenon | A | 19.8 ft | 6.4 µg/L |
| 22 | Lac du Castor Blanc | A | 19.5 ft | 4.5 µg/L |
| 23 | Lac de L'ÉPinette | A | 15.4 ft | 6.8 µg/L |
| 24 | Lac Caya | A | 23.3 ft | 5.3 µg/L |
| 25 | Lac Heney | A | 16.9 ft | 9 µg/L |
| 26 | Lac Patterson | A | 24.4 ft | 4.7 µg/L |
| 27 | Lac des Pins | A | 15.4 ft | - |
| 28 | Lac de L'Île | A | 24.3 ft | - |
| 29 | Lac du Castor Blanc | A | 11.8 ft | 7.3 µg/L |
| 30 | Lac Murray | A | 11.8 ft | 8.6 µg/L |
| 31 | Lac Grant | A | 14.1 ft | 6.6 µg/L |
| 32 | Lac Laverdure | A | 13.8 ft | 8.4 µg/L |
| 33 | Lac Lacroix | A | 12.5 ft | 5.8 µg/L |
| 34 | Lac CléMent | A | 14.1 ft | 7.3 µg/L |
| 35 | Petit Lac du Castor Blanc | B | 7.5 ft | 13.1 µg/L |
| 36 | Lac DéSormeaux | B | 7.5 ft | 13.3 µg/L |
Other Counties in Québec
See how La Vallée-de-la-Gatineau 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.