Urban agglomeration of La Tuque County, Québec · Water Quality Report Card
Lac à la Ligne
Lac à la Ligne in Urban agglomeration of La Tuque, Québec received a water quality grade of B (Good). Water clarity: 2.8 m visibility. Phosphorus: 7.4 µg/L. Chlorophyll-a (algae): 2.6 µg/L.
- Clarity
- 2.8 m
- Type
- Oligotrophic
Lac à la Ligne is a cold, clear oligotrophic lake in Urban agglomeration of La Tuque County, Québec. Water quality is graded B based on 3 sampling years through 2025. Compared to the 7 other monitored lakes in Urban agglomeration of La Tuque County, Lac à la Ligne ranks #7 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 9.2 ft. Phosphorus level: 7.4 µg/L. Chlorophyll-a: 2.6 µg/L. Trophic State Index: 39.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.8 m | C |
| Phosphorus | 7.4 µg/L | A |
| Chlorophyll-a (Algae) | 2.6 µg/L | A |
| Trophic State Index (TSI) | 39 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Lac à la Ligne
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Fishing Lac à la Ligne
Location
County Ranking
Ranked #7 of 8 lakes in Urban agglomeration of La Tuque
Cleaner Lakes Within 30 Miles
Lac à la Ligne holds Grade B. 4 nearby lakes hold higher grades.
- ALac WayagamacUrban agglomeration of La Tuque · 3.2 mi · Higher grade (B → A)
- ALac la TuqueUrban agglomeration of La Tuque · 14.5 mi · Higher grade (B → A)
- ALac à BeauceUrban agglomeration of La Tuque · 7.8 mi · Higher grade (B → A)
- ALac Aux BrochetsUrban agglomeration of La Tuque · 13.7 mi · Higher grade (B → A)
Nearby Lakes in Urban agglomeration of La Tuque
Explore Lac à la Ligne 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 à la Ligne 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: