Montcalm County Lake Quality
Québec, 8 lakes, average grade B (Good)
Only 8 lakes in Montcalm 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. With an average grade of B, Montcalm 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 Cristal (A) is the cleanest in the county.
Quick Answers for Montcalm County
Planning a trip? Check special fishing regulations for Lac Cristal — or check the official Québec fishing regulations.
All Lakes in Montcalm County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Lac Cristal | A | 23.6 ft | 2.3 µg/L |
| 2 | Lac Bob | A | 11.5 ft | 6 µg/L |
| 3 | Lac Mcgill | B | 6.9 ft | 9.8 µg/L |
| 4 | Lac Colette | B | 6.9 ft | 11.3 µg/L |
| 5 | Lac Rond | B | 8.5 ft | 7.5 µg/L |
| 6 | Lac Duffy | B | 9 ft | 9.9 µg/L |
| 7 | Lac Siesta | B | 7.5 ft | 8.5 µg/L |
| 8 | Lac Lafond | C | 7.5 ft | - |
Other Counties in Québec
See how Montcalm County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 38 states.
Where to stay near Montcalm County
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Source: EPA National Aquatic Resource Surveys, 2026.