Lac-Saint-Jean-Est County, Québec · Water Quality Report Card
Lac à Ludovic-Gauthier
Lac à Ludovic-Gauthier in Lac-Saint-Jean-Est, Québec received a water quality grade of A (Excellent). Water clarity: 6.6 m visibility. Phosphorus: 3.8 µg/L. Chlorophyll-a (algae): 1.3 µg/L.
- Clarity
- 6.6 m
- Type
- Oligotrophic
Lac à Ludovic-Gauthier is a cold, clear oligotrophic lake in Lac-Saint-Jean-Est County, Québec. Water quality is graded A based on 3 sampling years through 2025. Compared to the 15 other monitored lakes in Lac-Saint-Jean-Est County, Lac à Ludovic-Gauthier 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
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
Crystal clear, you can see 21.5 ft down. Phosphorus level: 3.8 µg/L. Chlorophyll-a: 1.3 µg/L. Trophic State Index: 30.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6.55 m | A |
| Phosphorus | 3.8 µg/L | A |
| Chlorophyll-a (Algae) | 1.3 µg/L | A |
| Trophic State Index (TSI) | 30 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Lac à Ludovic-Gauthier
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Fishing Lac à Ludovic-Gauthier
Location
County Ranking
Ranked #3 of 16 lakes in Lac-Saint-Jean-Est
Nearby Lakes in Lac-Saint-Jean-Est
Explore Lac à Ludovic-Gauthier across LakeGrade
More Québec Lake Rankings
Other Grade A Lakes in Québec
Oligotrophic Lakes in Québec
More records, surveys & data sources
Where this data comes from
Measurements for Lac à Ludovic-Gauthier 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: