Sudbury District County, Ontario · Water Quality Report Card
St Charles Lake
St Charles Lake in Sudbury District, Ontario received a water quality grade of C (Fair). Water clarity: 2.7 m visibility.
- Clarity
- 2.7 m
- Type
- Mesotrophic
St Charles Lake is a mesotrophic lake in Sudbury District County, Ontario. Water quality is graded C based on 1 sampling years through 2025. Compared to the 264 other monitored lakes in Sudbury District County, St Charles Lake ranks #256 for water quality.
Source: EPA Water Quality Portal sampling records, Ontario MECP, last sampled 2025-05-20. Grade methodology: LakeGrade methodology.
Watch St Charles Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Moderate clarity, visible to about 8.9 ft. Trophic State Index: 46.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.7 m | C |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 46 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near St Charles Lake
Compare lakeside cabins, hotels, and vacation rentals near St Charles Lake in Sudbury 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 St Charles 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 St Charles Lake?
Get lake water-quality report cards plus the best cabin & lodging deals near St Charles Lake — straight to your inbox. No spam, unsubscribe anytime.
Fishing St Charles Lake
Location
County Ranking
Ranked #256 of 265 lakes in Sudbury District
Cleaner Lakes Within 30 Miles
St Charles Lake holds Grade C. 2 nearby lakes hold higher grades.
Nearby Lakes in Sudbury District
Explore St Charles Lake across LakeGrade
More Ontario Lake Rankings
Other Grade C Lakes in Ontario
Mesotrophic Lakes in Ontario
More records, surveys & data sources
Where this data comes from
Measurements for St Charles 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: 2025-05-20
Monitoring stations: