Urban agglomeration of Longueuil County Lake Quality
Québec, 5 lakes, average grade B (Good)
Urban agglomeration of Longueuil County has 5 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, Urban agglomeration of Longueuil 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 des Bouleaux (A) is the cleanest in the county.
Quick Answers for Urban agglomeration of Longueuil County
Planning a trip? Check special fishing regulations for Lac des Bouleaux — or check the official Québec fishing regulations.
All Lakes in Urban agglomeration of Longueuil County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Lac des Bouleaux | A | 15.4 ft | 10.6 µg/L |
| 2 | Lac du Moulin | B | 10.5 ft | 14 µg/L |
| 3 | Lac Seigneurial | B | 11.8 ft | 14.5 µg/L |
| 4 | Lac à la Tortue | B | 7.2 ft | 17.9 µg/L |
| 5 | Lac du Village | C | 8.2 ft | 30.3 µg/L |
Other Counties in Québec
See how Urban agglomeration of Longueuil 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.