Mauricie County, Québec · Water Quality Report Card
Lac à la Tortue
Lac à la Tortue in Mauricie, Québec received a water quality grade of A (Excellent). Water clarity: 3.2 m visibility. Phosphorus: 11.6 µg/L. Chlorophyll-a (algae): 3.9 µg/L.
- Clarity
- 3.2 m
- Type
- Mesotrophic
Lac à la Tortue is a mesotrophic lake in Mauricie County, Québec. Water quality is graded A based on 3 sampling years through 2025. Compared to the 7 other monitored lakes in Mauricie County, Lac à la Tortue ranks #4 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
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
Good clarity, visible to about 10.5 ft. Phosphorus level: 11.6 µg/L. Chlorophyll-a: 3.9 µg/L. Trophic State Index: 42.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.2 m | B |
| Phosphorus | 11.6 µg/L | A |
| Chlorophyll-a (Algae) | 3.9 µg/L | A |
| Trophic State Index (TSI) | 42 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Lac à la Tortue
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Fishing Lac à la Tortue
Location
County Ranking
Ranked #4 of 8 lakes in Mauricie
Nearby Lakes in Mauricie
Explore Lac à la Tortue across LakeGrade
More Québec Lake Rankings
Other Grade A Lakes in Québec
Mesotrophic Lakes in Québec
More records, surveys & data sources
Where this data comes from
Measurements for Lac à la Tortue 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: