La Vallée-de-l'Or County Lake Quality
Québec, 7 lakes, average grade B (Good)
La Vallée-de-l'Or County has 7 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. With an average grade of B, La Vallée-de-l'Or County sits comfortably above the Québec median.
Most of the county's monitored lakes are shallow — under 50 feet — which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed. Lac Parent (A) is the cleanest in the county.
Quick Answers for La Vallée-de-l'Or County
Planning a trip? Check special fishing regulations for Lac Parent — or check the official Québec fishing regulations.
All Lakes in La Vallée-de-l'Or County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Lac Parent | A | - | 10.9 µg/L |
| 2 | Lac Lemoine | B | 4.6 ft | 11.5 µg/L |
| 3 | Lac Sabourin | B | 4.9 ft | 12.6 µg/L |
| 4 | Lac Tiblemont | B | 5.6 ft | 9.5 µg/L |
| 5 | Lac Blouin | B | 3.1 ft | 15.5 µg/L |
| 6 | Lac Malartic | C | 1.5 ft | 33.9 µg/L |
| 7 | Lac de Montigny | C | 2 ft | 32.8 µg/L |
Other Counties in Québec
See how La Vallée-de-l'Or 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.