Muskoka District County, Ontario · Water Quality Report Card
Sunny Lake
Sunny Lake in Muskoka District, Ontario received a water quality grade of A (Excellent). Water clarity: 4.7 m visibility.
- Clarity
- 4.7 m
- Type
- Oligotrophic
Sunny Lake is a cold, clear oligotrophic lake in Muskoka District County, Ontario. Water quality is graded A based on 1 sampling years through 2025. Compared to the 169 other monitored lakes in Muskoka District County, Sunny Lake ranks #20 for water quality.
Source: EPA Water Quality Portal sampling records, Ontario MECP, last sampled 2025-10-09. Grade methodology: LakeGrade methodology.
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Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
Crystal clear, you can see 15.3 ft down. Trophic State Index: 38.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.65 m | A |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 38 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
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Fishing Sunny Lake
Location
County Ranking
Ranked #20 of 170 lakes in Muskoka District
Nearby Lakes in Muskoka District
Explore Sunny Lake across LakeGrade
More Ontario Lake Rankings
Other Grade A Lakes in Ontario
Oligotrophic Lakes in Ontario
More records, surveys & data sources
Where this data comes from
Measurements for Sunny 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: 2025-10-09
Monitoring stations: