Portneuf County, Québec · Water Quality Report Card
Lac Sergent
Lac Sergent in Portneuf, Québec received a water quality grade of B (Good). Water clarity: 3.4 m visibility. Phosphorus: 8.6 µg/L. Chlorophyll-a (algae): 5.2 µg/L.
- Clarity
- 3.4 m
- Type
- Mesotrophic
Lac Sergent is a mesotrophic lake in Portneuf County, Québec. Water quality is graded B based on 3 sampling years through 2025. Compared to the 22 other monitored lakes in Portneuf County, Lac Sergent ranks #15 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
Good clarity, visible to about 11.2 ft. Phosphorus level: 8.6 µg/L. Chlorophyll-a: 5.2 µg/L. Trophic State Index: 41.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.4 m | B |
| Phosphorus | 8.6 µg/L | A |
| Chlorophyll-a (Algae) | 5.2 µg/L | B |
| Trophic State Index (TSI) | 41 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Lac Sergent
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Fishing Lac Sergent
Location
County Ranking
Ranked #15 of 23 lakes in Portneuf
Cleaner Lakes Within 30 Miles
Lac Sergent holds Grade B. 5 nearby lakes hold higher grades.
- ALac RitaPortneuf · 7.6 mi · Higher grade (B → A)
- ALac Sept ÎLesPortneuf · 4.2 mi · Higher grade (B → A)
- ALac Saint-JosephLa Jacques-Cartier · 5 mi · Higher grade (B → A)
- ALac BonhommeUrban agglomeration of Québec · 9.6 mi · Higher grade (B → A)
- ALac BleuPortneuf · 12.8 mi · Higher grade (B → A)
Nearby Lakes in Portneuf
Explore Lac Sergent 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 Lac Sergent 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: