Arthabaska County Lake Quality
Québec, 5 lakes, average grade B (Good)
Arthabaska 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, Arthabaska County sits comfortably above the Québec median.
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 Nicolet (A); the most-stressed is Les Trois Lacs (C).
Quick Answers for Arthabaska County
Planning a trip? Check special fishing regulations for Lac Nicolet — or check the official Québec fishing regulations.
All Lakes in Arthabaska County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Lac Nicolet | A | 24 ft | 2.8 µg/L |
| 2 | Lac Coulombe | B | 8 ft | 11.3 µg/L |
| 3 | Lac à la Truite | B | 4.6 ft | 17 µg/L |
| 4 | Lac des CyprèS | B | 7.9 ft | 21 µg/L |
| 5 | Les Trois Lacs | C | 4.6 ft | 30.2 µg/L |
Other Counties in Québec
See how Arthabaska 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 Arthabaska County
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Source: EPA National Aquatic Resource Surveys, 2026.