Leeds and Grenville Counties County, Ontario · Water Quality Report Card
Upper Rideau Lake
Upper Rideau Lake in Leeds and Grenville Counties, Ontario received a water quality grade of B (Good). Water clarity: 3.8 m visibility. Phosphorus: 20 µg/L.
- Clarity
- 3.8 m
- Type
- Mesotrophic
Upper Rideau Lake is a mesotrophic lake in Leeds and Grenville Counties County, Ontario. Water quality is graded B based on 2 sampling years through 2025. Compared to the 33 other monitored lakes in Leeds and Grenville Counties County, Upper Rideau Lake ranks #28 for water quality.
Source: EPA Water Quality Portal sampling records, Ontario MECP, last sampled 2025-10-17. Grade methodology: LakeGrade methodology.
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Good clarity, visible to about 12.5 ft. Phosphorus level: 20 µg/L. Trophic State Index: 44.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.8 m | B |
| Phosphorus | 20 µg/L | B |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Upper Rideau Lake
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Fishing Upper Rideau Lake
Location
County Ranking
Ranked #28 of 34 lakes in Leeds and Grenville Counties
Cleaner Lakes Within 30 Miles
Upper Rideau Lake holds Grade B. 5 nearby lakes hold higher grades.
- AIndian LakeLeeds and Grenville Counties · 6 mi · Higher grade (B → A)
- ANewboro LakeLeeds and Grenville Counties · 4.6 mi · Higher grade (B → A)
- ATommy LakeLeeds and Grenville Counties · 5.1 mi · Higher grade (B → A)
- AClear LakeLeeds and Grenville Counties · 5.4 mi · Higher grade (B → A)
- ABenson LakeLeeds and Grenville Counties · 6.5 mi · Higher grade (B → A)
Nearby Lakes in Leeds and Grenville Counties
Explore Upper Rideau 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 Upper Rideau 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: 2025-10-17
Monitoring stations: