Hastings County, Ontario · Water Quality Report Card
St Peter Lake
St Peter Lake in Hastings, Ontario received a water quality grade of B (Good). Water clarity: 2.8 m visibility. Phosphorus: 7.2 µg/L.
- Clarity
- 2.8 m
- Type
- Oligotrophic
St Peter Lake is a cold, clear oligotrophic lake in Hastings County, Ontario. Water quality is graded B based on 2 sampling years through 2025. Compared to the 66 other monitored lakes in Hastings County, St Peter Lake ranks #62 for water quality.
Source: EPA Water Quality Portal sampling records, Ontario MECP, last sampled 2025-10-18. 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 9.2 ft. Phosphorus level: 7.2 µg/L. Trophic State Index: 39.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.8 m | C |
| Phosphorus | 7.2 µg/L | A |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 39 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
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Fishing St Peter Lake
Location
County Ranking
Ranked #62 of 67 lakes in Hastings
Cleaner Lakes Within 30 Miles
St Peter Lake holds Grade B. 3 nearby lakes hold higher grades.
- ALittle Meach LakeHastings · 4.8 mi · Higher grade (B → A)
- AMckenzie LakeNipissing District · 4 mi · Higher grade (B → A)
- AMeach LakeHastings · 5.2 mi · Higher grade (B → A)
Nearby Lakes in Hastings
Explore St Peter Lake across LakeGrade
More Ontario Lake Rankings
Other Grade B Lakes in Ontario
Oligotrophic Lakes in Ontario
More records, surveys & data sources
Where this data comes from
Measurements for St Peter 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: 2025-10-18
Monitoring stations: