Muskoka District County, Ontario · Water Quality Report Card
Dotty Lake
Dotty Lake in Muskoka District, Ontario received a water quality grade of B (Good). Water clarity: 3.1 m visibility.
- Clarity
- 3.1 m
- Type
- Mesotrophic
Dotty Lake is a mesotrophic lake in Muskoka District County, Ontario. Water quality is graded B based on 1 sampling years through 2025. Compared to the 169 other monitored lakes in Muskoka District County, Dotty Lake ranks #105 for water quality.
Source: EPA Water Quality Portal sampling records, Ontario MECP, last sampled 2025-10-26. Grade methodology: LakeGrade methodology.
Watch Dotty Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Good clarity, visible to about 10.2 ft. Trophic State Index: 44.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.1 m | B |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Dotty Lake
Compare lakeside cabins, hotels, and vacation rentals near Dotty Lake in Muskoka District, Ontario — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Dotty Lake
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a trip to Dotty Lake?
Get lake water-quality report cards plus the best cabin & lodging deals near Dotty Lake — straight to your inbox. No spam, unsubscribe anytime.
Fishing Dotty Lake
Location
County Ranking
Ranked #105 of 170 lakes in Muskoka District
Cleaner Lakes Within 30 Miles
Dotty Lake holds Grade B. 5 nearby lakes hold higher grades.
- ABella LakeMuskoka District · 2.5 mi · Higher grade (B → A)
- ABrooks LakeMuskoka District · 0.5 mi · Higher grade (B → A)
- ASouth Nelson LakeMuskoka District · 1.9 mi · Higher grade (B → A)
- AOxbow LakeMuskoka District · 2 mi · Higher grade (B → A)
- ATasso LakeMuskoka District · 2.8 mi · Higher grade (B → A)
Nearby Lakes in Muskoka District
Explore Dotty Lake across LakeGrade
More Ontario Lake Rankings
Other Grade B Lakes in Ontario
Mesotrophic Lakes in Ontario
More records, surveys & data sources
Where this data comes from
Measurements for Dotty 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: 2025-10-26
Monitoring stations: