Kamouraska County, Québec · Water Quality Report Card
Lac Saint-Pierre
Lac Saint-Pierre in Kamouraska, Québec received a water quality grade of B (Good). Water clarity: 2.8 m visibility. Phosphorus: 11.1 µg/L. Chlorophyll-a (algae): 7.1 µg/L.
- Clarity
- 2.8 m
- Type
- Mesotrophic
Lac Saint-Pierre is a mesotrophic lake in Kamouraska County, Québec. Water quality is graded B based on 3 sampling years through 2025. Compared to the 1 other monitored lakes in Kamouraska County, Lac Saint-Pierre ranks #2 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
Moderate clarity, visible to about 9 ft. Phosphorus level: 11.1 µg/L. Chlorophyll-a: 7.1 µg/L. Trophic State Index: 45.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.75 m | C |
| Phosphorus | 11.1 µg/L | A |
| Chlorophyll-a (Algae) | 7.1 µg/L | B |
| Trophic State Index (TSI) | 45 | Mesotrophic |
Moderate nutrients, good water quality
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Fishing Lac Saint-Pierre
Location
County Ranking
Ranked #2 of 2 lakes in Kamouraska
Cleaner Lakes Within 30 Miles
Lac Saint-Pierre holds Grade B. 4 nearby lakes hold higher grades.
- ALac de L'EstKamouraska · 22.9 mi · Higher grade (B → A)
- ALac BringéL'Islet · 24.9 mi · Higher grade (B → A)
- BLac Trois SaumonsL'Islet · 23.4 mi · Higher overall water quality score
- BLac NairneCharlevoix-Est · 28.6 mi · Higher overall water quality score
Nearby Lakes in Kamouraska
Explore Lac Saint-Pierre 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 Saint-Pierre 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: