Pontiac County, Québec · Water Quality Report Card
Lac de la Roche
Lac de la Roche in Pontiac, Québec received a water quality grade of B (Good). Water clarity: 4.1 m visibility.
- Clarity
- 4.1 m
- Type
- Oligotrophic
Lac de la Roche is a cold, clear oligotrophic lake in Pontiac County, Québec. Water quality is graded B based on 1 sampling years through 2025. Compared to the 17 other monitored lakes in Pontiac County, Lac de la Roche ranks #17 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
Good clarity, visible to about 13.5 ft. Trophic State Index: 40.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.1 m | B |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 40 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Lac de la Roche
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Fishing Lac de la Roche
Location
County Ranking
Ranked #17 of 18 lakes in Pontiac
Cleaner Lakes Within 30 Miles
Lac de la Roche holds Grade B. 2 nearby lakes hold higher grades.
Nearby Lakes in Pontiac
Explore Lac de la Roche 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 de la Roche 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: