Maskinongé County, Québec · Water Quality Report Card
Lac Saint-Alexis
Lac Saint-Alexis in Maskinongé, Québec received a water quality grade of B (Good). Water clarity: 2.3 m visibility. Phosphorus: 8.8 µg/L. Chlorophyll-a (algae): 2 µg/L.
- Clarity
- 2.3 m
- Type
- Mesotrophic
Lac Saint-Alexis is a mesotrophic lake in Maskinongé County, Québec. Water quality is graded B based on 3 sampling years through 2025. Compared to the 31 other monitored lakes in Maskinongé County, Lac Saint-Alexis ranks #23 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 7.5 ft. Phosphorus level: 8.8 µg/L. Chlorophyll-a: 2 µg/L. Trophic State Index: 40.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.3 m | C |
| Phosphorus | 8.8 µg/L | A |
| Chlorophyll-a (Algae) | 2 µg/L | A |
| Trophic State Index (TSI) | 40 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Lac Saint-Alexis
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Fishing Lac Saint-Alexis
Location
County Ranking
Ranked #23 of 32 lakes in Maskinongé
Cleaner Lakes Within 30 Miles
Lac Saint-Alexis holds Grade B. 5 nearby lakes hold higher grades.
- ALac LambertMaskinongé · 4 mi · Higher grade (B → A)
- ALac LambertMaskinongé · 4.6 mi · Higher grade (B → A)
- ALac ThomasD'Autray · 7.2 mi · Higher grade (B → A)
- ALac RougeD'Autray · 6.2 mi · Higher grade (B → A)
- ALac CrocheD'Autray · 6.3 mi · Higher grade (B → A)
Nearby Lakes in Maskinongé
Explore Lac Saint-Alexis 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-Alexis 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: