Argenteuil County, Québec · Water Quality Report Card
Lac Frederic
Lac Frederic in Argenteuil, Québec received a water quality grade of C (Fair). Water clarity: 1.7 m visibility. Phosphorus: 19.7 µg/L. Chlorophyll-a (algae): 10.2 µg/L.
- Clarity
- 1.7 m
- Type
- Eutrophic
Lac Frederic is a productive, nutrient-rich eutrophic lake in Argenteuil County, Québec. Water quality is graded C based on 3 sampling years through 2025. Compared to the 47 other monitored lakes in Argenteuil County, Lac Frederic ranks #47 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
Murky, only visible to about 5.6 ft. Phosphorus level: 19.7 µg/L. Chlorophyll-a: 10.2 µg/L. Trophic State Index: 51.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.7 m | D |
| Phosphorus | 19.7 µg/L | A |
| Chlorophyll-a (Algae) | 10.2 µg/L | C |
| Trophic State Index (TSI) | 51 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Lac Frederic
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Fishing Lac Frederic
Location
County Ranking
Ranked #47 of 48 lakes in Argenteuil
Cleaner Lakes Within 30 Miles
Lac Frederic holds Grade C. 5 nearby lakes hold higher grades.
- ALac ÉChoArgenteuil · 0.5 mi · Two grade letters higher (C → A)
- ALac ClairArgenteuil · 2.2 mi · Two grade letters higher (C → A)
- ALac BoydArgenteuil · 2.7 mi · Two grade letters higher (C → A)
- ALac KennyArgenteuil · 0.7 mi · Two grade letters higher (C → A)
- ALac Sir-JohnArgenteuil · 1.3 mi · Two grade letters higher (C → A)
Nearby Lakes in Argenteuil
Explore Lac Frederic 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 Lac Frederic 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: