Les Appalaches County, Québec · Water Quality Report Card
Petit Lac Saint-FrançOis
Petit Lac Saint-FrançOis in Les Appalaches, Québec received a water quality grade of B (Good). Water clarity: 1.2 m visibility. Phosphorus: 14.1 µg/L. Chlorophyll-a (algae): 4.8 µg/L.
- Clarity
- 1.2 m
- Type
- Mesotrophic
Petit Lac Saint-FrançOis is a mesotrophic lake in Les Appalaches County, Québec. Water quality is graded B based on 3 sampling years through 2025. Compared to the 11 other monitored lakes in Les Appalaches County, Petit Lac Saint-FrançOis ranks #5 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
Murky, only visible to about 3.9 ft. Phosphorus level: 14.1 µg/L. Chlorophyll-a: 4.8 µg/L. Trophic State Index: 49.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.2 m | D |
| Phosphorus | 14.1 µg/L | A |
| Chlorophyll-a (Algae) | 4.8 µg/L | A |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Petit Lac Saint-FrançOis
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Fishing Petit Lac Saint-FrançOis
Location
County Ranking
Ranked #5 of 12 lakes in Les Appalaches
Cleaner Lakes Within 30 Miles
Petit Lac Saint-FrançOis holds Grade B. 2 nearby lakes hold higher grades.
- BLac à la TruiteLes Appalaches · 5.9 mi · Higher overall water quality score
- BLac de L'EstLes Appalaches · 7.9 mi · Higher overall water quality score
Nearby Lakes in Les Appalaches
Explore Petit Lac Saint-FrançOis 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 Petit Lac Saint-FrançOis 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: