Arthabaska County, Québec · Water Quality Report Card
Les Trois Lacs
Les Trois Lacs in Arthabaska, Québec received a water quality grade of C (Fair). Water clarity: 1.4 m visibility. Phosphorus: 30.2 µg/L. Chlorophyll-a (algae): 8 µg/L.
- Clarity
- 1.4 m
- Type
- Eutrophic
Les Trois Lacs is a productive, nutrient-rich eutrophic lake in Arthabaska County, Québec. Water quality is graded C based on 3 sampling years through 2024. Compared to the 4 other monitored lakes in Arthabaska County, Les Trois Lacs ranks #5 for water quality.
Source: EPA Water Quality Portal sampling records, MELCCFP, last sampled 2024-08-01. Grade methodology: LakeGrade methodology.
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Murky, only visible to about 4.6 ft. Phosphorus level: 30.2 µg/L. Chlorophyll-a: 8 µg/L. Trophic State Index: 53.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.4 m | D |
| Phosphorus | 30.2 µg/L | C |
| Chlorophyll-a (Algae) | 8 µg/L | B |
| Trophic State Index (TSI) | 53 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Les Trois Lacs
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Fishing Les Trois Lacs
Location
County Ranking
Ranked #5 of 5 lakes in Arthabaska
Cleaner Lakes Within 30 Miles
Les Trois Lacs holds Grade C. 5 nearby lakes hold higher grades.
- ALac NicoletArthabaska · 16.8 mi · Two grade letters higher (C → A)
- ALac D'ArgentLe Haut-Saint-François · 18.4 mi · Two grade letters higher (C → A)
- BSpooner PondLe Val-Saint-François · 12.6 mi · Higher grade (C → B)
- BLac BoissonneaultLe Val-Saint-François · 14.1 mi · Higher grade (C → B)
- BLac à la TruiteLes Sources · 15 mi · Higher grade (C → B)
Nearby Lakes in Arthabaska
Explore Les Trois Lacs across LakeGrade
More Québec Lake Rankings
Other Grade C Lakes in Québec
Eutrophic Lakes in Québec
More records, surveys & data sources
Where this data comes from
Measurements for Les Trois Lacs 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: 2024-08-01
Monitoring stations: