Memphrémagog County, Québec · Water Quality Report Card
Lac des FrançAis
Lac des FrançAis in Memphrémagog, Québec received a water quality grade of B (Good). Water clarity: 3 m visibility. Phosphorus: 9.3 µg/L. Chlorophyll-a (algae): 3.2 µg/L.
- Clarity
- 3 m
- Type
- Mesotrophic
Lac des FrançAis is a mesotrophic lake in Memphrémagog County, Québec. Water quality is graded B based on 3 sampling years through 2025. Compared to the 24 other monitored lakes in Memphrémagog County, Lac des FrançAis ranks #18 for water quality.
Source: EPA Water Quality Portal sampling records, MELCCFP, last sampled 2025-08-01. Grade methodology: LakeGrade methodology.
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Moderate clarity, visible to about 9.8 ft. Phosphorus level: 9.3 µg/L. Chlorophyll-a: 3.2 µg/L. Trophic State Index: 41.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3 m | C |
| Phosphorus | 9.3 µg/L | A |
| Chlorophyll-a (Algae) | 3.2 µg/L | A |
| Trophic State Index (TSI) | 41 | Mesotrophic |
Moderate nutrients, good water quality
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Fishing Lac des FrançAis
Location
County Ranking
Ranked #18 of 25 lakes in Memphrémagog
Cleaner Lakes Within 30 Miles
Lac des FrançAis holds Grade B. 4 nearby lakes hold higher grades.
- ALac BowkerMemphrémagog · 1.8 mi · Higher grade (B → A)
- ALac SimoneauMemphrémagog · 2.5 mi · Higher grade (B → A)
- ALac des MontsMemphrémagog · 3 mi · Higher grade (B → A)
- ALac BromptonMemphrémagog · 3.9 mi · Higher grade (B → A)
Nearby Lakes in Memphrémagog
Explore Lac des FrançAis across LakeGrade
More Québec Lake Rankings
Other Grade B Lakes in Québec
Mesotrophic Lakes in Québec
More records, surveys & data sources
Where this data comes from
Measurements for Lac des FrançAis come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Data Sources
Water quality data from the EPA Water Quality Portal
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion
Most recent sample: 2025-08-01
Monitoring stations: