Central Ontario County, Ontario · Water Quality Report Card
Scugog Lake
Scugog Lake in Central Ontario, Ontario received a water quality grade of C (Fair). Water clarity: 1 m visibility. Phosphorus: 20.9 µg/L.
- Clarity
- 1 m
- Type
- Eutrophic
Scugog Lake is a productive, nutrient-rich eutrophic lake in Central Ontario County, Ontario. Water quality is graded C based on 2 sampling years through 2025. Compared to the 19 other monitored lakes in Central Ontario County, Scugog Lake ranks #20 for water quality.
Source: EPA Water Quality Portal sampling records, Ontario MECP, last sampled 2025-10-29. Grade methodology: LakeGrade methodology.
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Very murky, less than 3.1 ft of visibility. Phosphorus level: 20.9 µg/L. Trophic State Index: 54.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 0.95 m | F |
| Phosphorus | 20.9 µg/L | B |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 54 | Eutrophic |
High nutrients, frequent algae, reduced clarity
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Fishing Scugog Lake
Location
County Ranking
Ranked #20 of 20 lakes in Central Ontario
Cleaner Lakes Within 30 Miles
Scugog Lake holds Grade C. 5 nearby lakes hold higher grades.
- AChalk LakeDurham Region · 15.6 mi · Two grade letters higher (C → A)
- BSturgeon LakeCentral Ontario · 22 mi · Higher grade (C → B)
- BPigeon River LakeCentral Ontario · 17.8 mi · Higher grade (C → B)
- BMusselman LakeYork Region · 24.5 mi · Higher grade (C → B)
- CWagner LakeDurham Region · 14.7 mi · Higher overall water quality score
Nearby Lakes in Central Ontario
Explore Scugog Lake across LakeGrade
More Ontario Lake Rankings
Other Grade C Lakes in Ontario
Eutrophic Lakes in Ontario
More records, surveys & data sources
Where this data comes from
Measurements for Scugog Lake 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: 2025-10-29
Monitoring stations: