Rimouski-Neigette County, Québec · Water Quality Report Card
Lac des Joncs
Lac des Joncs in Rimouski-Neigette, Québec received a water quality grade of C (Fair). Water clarity: 2.9 m visibility.
- Clarity
- 2.9 m
- Type
- Mesotrophic
Lac des Joncs is a mesotrophic lake in Rimouski-Neigette County, Québec. Water quality is graded C based on 1 sampling years through 2025. Compared to the 11 other monitored lakes in Rimouski-Neigette County, Lac des Joncs ranks #10 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
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Moderate clarity, visible to about 9.5 ft. Trophic State Index: 45.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.9 m | C |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 45 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Lac des Joncs
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Fishing Lac des Joncs
Location
County Ranking
Ranked #10 of 12 lakes in Rimouski-Neigette
Cleaner Lakes Within 30 Miles
Lac des Joncs holds Grade C. 5 nearby lakes hold higher grades.
- BLac à la TruiteRimouski-Neigette · 5.3 mi · Higher grade (C → B)
- BLac Saint-MathieuLes Basques · 13.4 mi · Higher grade (C → B)
- BGrand Lac ShawRimouski-Neigette · 14.6 mi · Higher grade (C → B)
- BLac PlourdeRimouski-Neigette · 16.6 mi · Higher grade (C → B)
- BPetit Lac Saint-MathieuLes Basques · 10 mi · Higher grade (C → B)
Nearby Lakes in Rimouski-Neigette
Explore Lac des Joncs across LakeGrade
More Québec Lake Rankings
Other Grade C Lakes in Québec
Mesotrophic Lakes in Québec
More records, surveys & data sources
Where this data comes from
Measurements for Lac des Joncs 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: