Skip to main content
LakeQuality

Sudbury District County, Ontario · Water Quality Report Card

St Charles Lake

C
Grade CFair
Limited DataMesotrophic

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.

MetricValueGrade
Water Clarity (Secchi Depth)2.7 mC
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)46Mesotrophic

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

Loading map…

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

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:

Where to stay near St Charles Lake →