Peterborough County, Ontario · Water Quality Report Card
Alder Lake
Alder Lake in Peterborough, Ontario received a water quality grade of B (Good). Water clarity: 3 m visibility. Phosphorus: 9.8 µg/L.
- Clarity
- 3 m
- Type
- Mesotrophic
Alder Lake is a mesotrophic lake in Peterborough County, Ontario. Water quality is graded B based on 2 sampling years through 2008. Compared to the 70 other monitored lakes in Peterborough County, Alder Lake ranks #66 for water quality.
Source: EPA Water Quality Portal sampling records, Ontario MECP, last sampled 2008-05-07. 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 9.8 ft. Phosphorus level: 9.8 µg/L. Trophic State Index: 41.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3 m | C |
| Phosphorus | 9.8 µg/L | A |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 41 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Alder Lake
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Fishing Alder Lake
Location
County Ranking
Ranked #66 of 71 lakes in Peterborough
Cleaner Lakes Within 30 Miles
Alder Lake holds Grade B. 3 nearby lakes hold higher grades.
- AEels LakePeterborough · 1.7 mi · Higher grade (B → A)
- ATallan LakePeterborough · 4.8 mi · Higher grade (B → A)
- ABuckskin LakeHaliburton · 6.8 mi · Higher grade (B → A)
Nearby Lakes in Peterborough
Explore Alder 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 Alder 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: 2008-05-07
Monitoring stations: