Brome-Missisquoi County Lake Quality
Québec, 6 lakes, average grade B (Good)
Brome-Missisquoi County has 6 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. The county-wide average lands at B — solid water quality with most lakes carrying clear summer transparency and low-to-moderate phosphorus.
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 Gale (A) is the cleanest in the county.
Quick Answers for Brome-Missisquoi County
Planning a trip? Check special fishing regulations for Lac Gale — or check the official Québec fishing regulations.
All Lakes in Brome-Missisquoi County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Lac Gale | A | 17.4 ft | 6 µg/L |
| 2 | Lac Brome | B | 10 ft | 14 µg/L |
| 3 | Lac Selby | B | 8.2 ft | 15.9 µg/L |
| 4 | Lac Bromont | B | 7.7 ft | 14.4 µg/L |
| 5 | ÉTang Sally | B | 6.6 ft | 11.3 µg/L |
| 6 | Lac Davignon | B | 6.6 ft | 11.8 µg/L |
Other Counties in Québec
See how Brome-Missisquoi 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.