L'Islet County, Québec · Water Quality Report Card
Lac Trois Saumons
Lac Trois Saumons in L'Islet, Québec received a water quality grade of B (Good). Water clarity: 3 m visibility. Phosphorus: 6.9 µg/L. Chlorophyll-a (algae): 2.3 µg/L.
- Clarity
- 3 m
- Type
- Oligotrophic
Lac Trois Saumons is a cold, clear oligotrophic lake in L'Islet County, Québec. Water quality is graded B based on 3 sampling years through 2025. Compared to the 5 other monitored lakes in L'Islet County, Lac Trois Saumons 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
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Moderate clarity, visible to about 9.7 ft. Phosphorus level: 6.9 µg/L. Chlorophyll-a: 2.3 µg/L. Trophic State Index: 38.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.95 m | C |
| Phosphorus | 6.9 µg/L | A |
| Chlorophyll-a (Algae) | 2.3 µg/L | A |
| Trophic State Index (TSI) | 38 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
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Fishing Lac Trois Saumons
Location
County Ranking
Ranked #3 of 6 lakes in L'Islet
Cleaner Lakes Within 30 Miles
Lac Trois Saumons holds Grade B. 3 nearby lakes hold higher grades.
- ALac Fontaine ClaireL'Islet · 15.8 mi · Higher grade (B → A)
- ALac BringéL'Islet · 1.7 mi · Higher grade (B → A)
- ALac de L'EstKamouraska · 29.2 mi · Higher grade (B → A)
Nearby Lakes in L'Islet
Explore Lac Trois Saumons 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 Trois Saumons 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: