Beauce-Sartigan County, Québec · Water Quality Report Card
Lac Aux Cygnes
Lac Aux Cygnes in Beauce-Sartigan, Québec received a water quality grade of A (Excellent). Water clarity: 3.1 m visibility. Phosphorus: 8.7 µg/L. Chlorophyll-a (algae): 3.1 µg/L.
- Clarity
- 3.1 m
- Type
- Mesotrophic
Lac Aux Cygnes is a mesotrophic lake in Beauce-Sartigan County, Québec. Water quality is graded A based on 3 sampling years through 2025. Compared to the 7 other monitored lakes in Beauce-Sartigan County, Lac Aux Cygnes ranks #3 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 10.2 ft. Phosphorus level: 8.7 µg/L. Chlorophyll-a: 3.1 µg/L. Trophic State Index: 40.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.1 m | B |
| Phosphorus | 8.7 µg/L | A |
| Chlorophyll-a (Algae) | 3.1 µg/L | A |
| Trophic State Index (TSI) | 40 | Mesotrophic |
Moderate nutrients, good water quality
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Fishing Lac Aux Cygnes
Location
County Ranking
Ranked #3 of 8 lakes in Beauce-Sartigan
Nearby Lakes in Beauce-Sartigan
Explore Lac Aux Cygnes 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 Aux Cygnes 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: