York Region County, Ontario · Water Quality Report Card
St George Lake
St George Lake in York Region, Ontario received a water quality grade of B (Good). Water clarity: 3 m visibility. Phosphorus: 18.7 µg/L.
- Clarity
- 3 m
- Type
- Mesotrophic
St George Lake is a mesotrophic lake in York Region County, Ontario. Water quality is graded B based on 2 sampling years through 2016. Compared to the 10 other monitored lakes in York Region County, St George Lake ranks #7 for water quality.
Source: EPA Water Quality Portal sampling records, Ontario MECP, last sampled 2016-06-12. Grade methodology: LakeGrade methodology.
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Moderate clarity, visible to about 9.7 ft. Phosphorus level: 18.7 µg/L. Trophic State Index: 45.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.95 m | C |
| Phosphorus | 18.7 µg/L | A |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 45 | Mesotrophic |
Moderate nutrients, good water quality
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Fishing St George Lake
Location
County Ranking
Ranked #7 of 11 lakes in York Region
Cleaner Lakes Within 30 Miles
St George Lake holds Grade B. 3 nearby lakes hold higher grades.
- APreston LakeYork Region · 3.1 mi · Higher grade (B → A)
- AEaton LakeYork Region · 4.6 mi · Higher grade (B → A)
- AMary LakeYork Region · 6 mi · Higher grade (B → A)
Nearby Lakes in York Region
Explore St George 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 St George 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: 2016-06-12
Monitoring stations: