Matawinie County, Québec · Water Quality Report Card
Lac des Aulnes
Lac des Aulnes in Matawinie, Québec received a water quality grade of B (Good). Water clarity: 3 m visibility. Phosphorus: 6.3 µg/L. Chlorophyll-a (algae): 2.7 µg/L.
- Clarity
- 3 m
- Type
- Oligotrophic
Lac des Aulnes is a cold, clear oligotrophic lake in Matawinie County, Québec. Water quality is graded B based on 3 sampling years through 2025. Compared to the 111 other monitored lakes in Matawinie County, Lac des Aulnes ranks #78 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 9.8 ft. Phosphorus level: 6.3 µg/L. Chlorophyll-a: 2.7 µg/L. Trophic State Index: 38.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3 m | C |
| Phosphorus | 6.3 µg/L | A |
| Chlorophyll-a (Algae) | 2.7 µg/L | A |
| Trophic State Index (TSI) | 38 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Lac des Aulnes
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Fishing Lac des Aulnes
Location
County Ranking
Ranked #78 of 112 lakes in Matawinie
Cleaner Lakes Within 30 Miles
Lac des Aulnes holds Grade B. 5 nearby lakes hold higher grades.
- ALac RochemaureMatawinie · 1.6 mi · Higher grade (B → A)
- ALac BaribeauMatawinie · 1.7 mi · Higher grade (B → A)
- ALac du PimbinaMatawinie · 2.2 mi · Higher grade (B → A)
- ALac BlancMatawinie · 2.9 mi · Higher grade (B → A)
- ALac ProvostMatawinie · 3.9 mi · Higher grade (B → A)
Nearby Lakes in Matawinie
Explore Lac des Aulnes 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 des Aulnes 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: