Rimouski-Neigette County, Québec · Water Quality Report Card
Grand Lac MalobèS
Grand Lac MalobèS in Rimouski-Neigette, Québec received a water quality grade of F (Very Poor). Water clarity: 0.8 m visibility.
- Clarity
- 0.8 m
- Type
- Eutrophic
Grand Lac MalobèS is a productive, nutrient-rich eutrophic lake in Rimouski-Neigette County, Québec. Water quality is graded F based on 1 sampling years through 2025. Compared to the 11 other monitored lakes in Rimouski-Neigette County, Grand Lac MalobèS ranks #12 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
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
Very murky, less than 2.6 ft of visibility. Trophic State Index: 63.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 0.8 m | F |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 63 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Grand Lac MalobèS
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Fishing Grand Lac MalobèS
Location
County Ranking
Ranked #12 of 12 lakes in Rimouski-Neigette
Cleaner Lakes Within 30 Miles
Grand Lac MalobèS holds Grade F. 5 nearby lakes hold higher grades.
- BLac à la TruiteRimouski-Neigette · 7.5 mi · Two grade letters higher (F → B)
- BLac Saint-MathieuLes Basques · 11.5 mi · Two grade letters higher (F → B)
- BGrand Lac ShawRimouski-Neigette · 16.7 mi · Two grade letters higher (F → B)
- BLac PlourdeRimouski-Neigette · 18.8 mi · Two grade letters higher (F → B)
- BPetit Lac Saint-MathieuLes Basques · 8.1 mi · Two grade letters higher (F → B)
Nearby Lakes in Rimouski-Neigette
Explore Grand Lac MalobèS across LakeGrade
More Québec Lake Rankings
Other Grade F Lakes in Québec
Eutrophic Lakes in Québec
More records, surveys & data sources
Where this data comes from
Measurements for Grand Lac MalobèS 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: