Les Collines-de-l'Outaouais County Lake Quality
Québec, 11 lakes, average grade A (Excellent)
Only 11 lakes in Les Collines-de-l'Outaouais County carry an active grade. The county-level summary is therefore representative of those specific lakes, not necessarily of every water body in the county. On average, Les Collines-de-l'Outaouais 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 Bernard (A); the most-stressed is Lac Donaldson (C).
Quick Answers for Les Collines-de-l'Outaouais County
Planning a trip? Check special fishing regulations for Lac Bernard — or check the official Québec fishing regulations.
All Lakes in Les Collines-de-l'Outaouais County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Lac Bernard | A | 15.4 ft | 5.5 µg/L |
| 2 | Lac Sinclair | A | 17.1 ft | 4.4 µg/L |
| 3 | Lac Lacaille | A | 18 ft | 4 µg/L |
| 4 | Lac à la Perdrix | A | 25.6 ft | 4.6 µg/L |
| 5 | Lac Teeples | A | 21.5 ft | 5.6 µg/L |
| 6 | Lac Johnston | A | 12.1 ft | 9.7 µg/L |
| 7 | Lac des Loups | A | 13.5 ft | 6.9 µg/L |
| 8 | Lac Mahon | A | 11.5 ft | 10.3 µg/L |
| 9 | Lac Jean-Venne | A | 11.8 ft | 8.6 µg/L |
| 10 | Lac Gauvreau | B | 7.7 ft | 15.4 µg/L |
| 11 | Lac Donaldson | C | 9.8 ft | - |
Other Counties in Québec
See how Les Collines-de-l'Outaouais 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.