La Côte-de-Beaupré County, Québec · Water Quality Report Card
Lac la Retenue
Lac la Retenue in La Côte-de-Beaupré, Québec received a water quality grade of B (Good). Water clarity: 2.6 m visibility. Phosphorus: 10.4 µg/L. Chlorophyll-a (algae): 1 µg/L.
- Clarity
- 2.6 m
- Type
- Oligotrophic
Lac la Retenue is a cold, clear oligotrophic lake in La Côte-de-Beaupré County, Québec. Water quality is graded B based on 3 sampling years through 2025.
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 8.4 ft. Phosphorus level: 10.4 µg/L. Chlorophyll-a: 1 µg/L. Trophic State Index: 38.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.55 m | C |
| Phosphorus | 10.4 µg/L | A |
| Chlorophyll-a (Algae) | 1 µg/L | A |
| Trophic State Index (TSI) | 38 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Lac la Retenue
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Fishing Lac la Retenue
Location
County Ranking
Ranked #1 of 1 lakes in La Côte-de-Beaupré
Cleaner Lakes Within 30 Miles
Lac la Retenue holds Grade B. 4 nearby lakes hold higher grades.
- ALac BeauportLa Jacques-Cartier · 6.7 mi · Higher grade (B → A)
- ALes Trois Petits LacsLa Jacques-Cartier · 14.4 mi · Higher grade (B → A)
- ALac BleuLa Jacques-Cartier · 8.7 mi · Higher grade (B → A)
- ALac DelageLa Jacques-Cartier · 13 mi · Higher grade (B → A)
Nearby Lakes in La Côte-de-Beaupré
Explore Lac la Retenue across LakeGrade
More Québec Lake Rankings
Other Grade B Lakes in Québec
Oligotrophic Lakes in Québec
More records, surveys & data sources
Where this data comes from
Measurements for Lac la Retenue 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: