La Matanie County, Québec · Water Quality Report Card
Lac des ÎLes
Lac des ÎLes in La Matanie, Québec received a water quality grade of B (Good). Water clarity: 1.8 m visibility. Phosphorus: 13.4 µg/L. Chlorophyll-a (algae): 5.6 µg/L.
- Clarity
- 1.8 m
- Type
- Mesotrophic
Lac des ÎLes is a mesotrophic lake in La Matanie County, Québec. Water quality is graded B based on 3 sampling years through 2025. Compared to the 3 other monitored lakes in La Matanie County, Lac des ÎLes ranks #4 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
Murky, only visible to about 5.9 ft. Phosphorus level: 13.4 µg/L. Chlorophyll-a: 5.6 µg/L. Trophic State Index: 47.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.8 m | D |
| Phosphorus | 13.4 µg/L | A |
| Chlorophyll-a (Algae) | 5.6 µg/L | B |
| Trophic State Index (TSI) | 47 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Lac des ÎLes
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Fishing Lac des ÎLes
Location
County Ranking
Ranked #4 of 4 lakes in La Matanie
Cleaner Lakes Within 30 Miles
Lac des ÎLes holds Grade B. 5 nearby lakes hold higher grades.
- ALac TowagoLa Matanie · 10.6 mi · Higher grade (B → A)
- ALac MatapéDiaLa Matapédia · 13.1 mi · Higher grade (B → A)
- ALac du QuinzièMe MilleLa Matapédia · 15.9 mi · Higher grade (B → A)
- ALac Saint-PierreLa Matapédia · 19.6 mi · Higher grade (B → A)
- ALac du PortageLa Matanie · 8.3 mi · Higher grade (B → A)
Nearby Lakes in La Matanie
Explore Lac des ÎLes 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 des ÎLes 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: