Portneuf County, Québec · Water Quality Report Card
Lac Perreault
Lac Perreault in Portneuf, Québec received a water quality grade of B (Good). Water clarity: 2.3 m visibility. Phosphorus: 6.1 µg/L. Chlorophyll-a (algae): 3.1 µg/L.
- Clarity
- 2.3 m
- Type
- Oligotrophic
Lac Perreault is a cold, clear oligotrophic lake in Portneuf County, Québec. Water quality is graded B based on 3 sampling years through 2025. Compared to the 22 other monitored lakes in Portneuf County, Lac Perreault ranks #16 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
Moderate clarity, visible to about 7.5 ft. Phosphorus level: 6.1 µg/L. Chlorophyll-a: 3.1 µg/L. Trophic State Index: 40.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.3 m | C |
| Phosphorus | 6.1 µg/L | A |
| Chlorophyll-a (Algae) | 3.1 µg/L | A |
| Trophic State Index (TSI) | 40 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Lac Perreault
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Fishing Lac Perreault
Location
County Ranking
Ranked #16 of 23 lakes in Portneuf
Cleaner Lakes Within 30 Miles
Lac Perreault holds Grade B. 4 nearby lakes hold higher grades.
- ALac ÉMeraudePortneuf · 3 mi · Higher grade (B → A)
- ALac BlancPortneuf · 1.4 mi · Higher grade (B → A)
- ALac Sainte-AnnePortneuf · 3.7 mi · Higher grade (B → A)
- ALac CarillonPortneuf · 4.7 mi · Higher grade (B → A)
Nearby Lakes in Portneuf
Explore Lac Perreault 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 Perreault 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: