Matawinie County, Québec · Water Quality Report Card
Lac Laurianne
Lac Laurianne in Matawinie, Québec received a water quality grade of B (Good). Water clarity: 1.7 m visibility. Phosphorus: 8.7 µg/L. Chlorophyll-a (algae): 5 µg/L.
- Clarity
- 1.7 m
- Type
- Mesotrophic
Lac Laurianne is a mesotrophic 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 Laurianne ranks #106 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 5.6 ft. Phosphorus level: 8.7 µg/L. Chlorophyll-a: 5 µg/L. Trophic State Index: 45.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.7 m | D |
| Phosphorus | 8.7 µg/L | A |
| Chlorophyll-a (Algae) | 5 µg/L | B |
| Trophic State Index (TSI) | 45 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Lac Laurianne
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Fishing Lac Laurianne
Location
County Ranking
Ranked #106 of 112 lakes in Matawinie
Cleaner Lakes Within 30 Miles
Lac Laurianne holds Grade B. 5 nearby lakes hold higher grades.
- ALac LouiseMatawinie · 5.3 mi · Higher grade (B → A)
- ALac ClairMatawinie · 5.3 mi · Higher grade (B → A)
- BLac BourréMatawinie · 2.7 mi · Higher overall water quality score
- BLac DanielMatawinie · 4.9 mi · Higher overall water quality score
- BLac CôMeMatawinie · 1.1 mi · Higher overall water quality score
Nearby Lakes in Matawinie
Explore Lac Laurianne 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 Laurianne 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: