Les Appalaches County, Québec · 46.08°N · Water Quality Report Card
Lac à la Truite
Lac à la Truite in Les Appalaches, Québec received a water quality grade of D (Poor). Water clarity: 0.9 m visibility. Phosphorus: 64.2 µg/L. Chlorophyll-a (algae): 15.8 µg/L.
- Clarity
- 0.9 m
- Type
- Eutrophic
Lac à la Truite is a productive, nutrient-rich eutrophic lake in Les Appalaches County, Québec. Water quality is graded D based on 3 sampling years through 2025. Compared to the 11 other monitored lakes in Les Appalaches County, Lac à la Truite ranks #12 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
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Very murky, less than 3 ft of visibility. Phosphorus level: 64.2 µg/L. Chlorophyll-a: 15.8 µg/L. Trophic State Index: 61.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 0.9 m | F |
| Phosphorus | 64.2 µg/L | D |
| Chlorophyll-a (Algae) | 15.8 µg/L | C |
| Trophic State Index (TSI) | 61 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Lac à la Truite
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Fishing Lac à la Truite
Location
County Ranking
Ranked #12 of 12 lakes in Les Appalaches
Cleaner Lakes Within 30 Miles
Lac à la Truite holds Grade D. 5 nearby lakes hold higher grades.
- ALac BreechesLes Appalaches · 12.2 mi · Two grade letters higher (D → A)
- BLac de L'EstLes Appalaches · 10.4 mi · Two grade letters higher (D → B)
- BPetit Lac Saint-FrançOisLes Appalaches · 12.9 mi · Two grade letters higher (D → B)
- BLac CaribouLes Appalaches · 9.6 mi · Two grade letters higher (D → B)
- CLac WilliamL'Érable · 4.4 mi · Higher grade (D → C)
Nearby Lakes in Les Appalaches
Explore Lac à la Truite across LakeGrade
More Québec Lake Rankings
Other Grade D Lakes in Québec
Eutrophic Lakes in Québec
More records, surveys & data sources
Where this data comes from
Measurements for Lac à la Truite 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: