Leeds and Grenville Counties County, Ontario · Water Quality Report Card
Lyndhurst Lake
Lyndhurst Lake in Leeds and Grenville Counties, Ontario received a water quality grade of B (Good). Water clarity: 3 m visibility. Phosphorus: 24.7 µg/L.
- Clarity
- 3 m
- Type
- Mesotrophic
Lyndhurst Lake is a mesotrophic lake in Leeds and Grenville Counties County, Ontario. Water quality is graded B based on 2 sampling years through 2025. Compared to the 33 other monitored lakes in Leeds and Grenville Counties County, Lyndhurst Lake ranks #30 for water quality.
Source: EPA Water Quality Portal sampling records, Ontario MECP, last sampled 2025-10-02. 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: 24.7 µg/L. Trophic State Index: 47.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3 m | C |
| Phosphorus | 24.7 µg/L | B |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 47 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Lyndhurst Lake
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Fishing Lyndhurst Lake
Location
County Ranking
Ranked #30 of 34 lakes in Leeds and Grenville Counties
Cleaner Lakes Within 30 Miles
Lyndhurst Lake holds Grade B. 5 nearby lakes hold higher grades.
- ABass LakeLeeds and Grenville Counties · 2.7 mi · Higher grade (B → A)
- ARed Horse LakeLeeds and Grenville Counties · 1.8 mi · Higher grade (B → A)
- AGrippen LakeLeeds and Grenville Counties · 3.3 mi · Higher grade (B → A)
- ALong LakeLeeds and Grenville Counties · 4.3 mi · Higher grade (B → A)
- BSingleton LakeLeeds and Grenville Counties · 2.1 mi · Higher overall water quality score
Nearby Lakes in Leeds and Grenville Counties
Explore Lyndhurst 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 Lyndhurst 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: 2025-10-02
Monitoring stations: