Grey County, Ontario · Water Quality Report Card
Boyd Lake
Boyd Lake in Grey, Ontario received a water quality grade of B (Good). Water clarity: 2.5 m visibility. Phosphorus: 13.4 µg/L.
- Clarity
- 2.5 m
- Type
- Mesotrophic
Boyd Lake is a mesotrophic lake in Grey County, Ontario. Water quality is graded B based on 2 sampling years through 2025. Compared to the 11 other monitored lakes in Grey County, Boyd Lake ranks #7 for water quality.
Source: EPA Water Quality Portal sampling records, Ontario MECP, last sampled 2025-10-26. 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 8.2 ft. Phosphorus level: 13.4 µg/L. Trophic State Index: 44.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.5 m | C |
| Phosphorus | 13.4 µg/L | A |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
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Fishing Boyd Lake
Location
County Ranking
Ranked #7 of 12 lakes in Grey
Cleaner Lakes Within 30 Miles
Boyd Lake holds Grade B. 5 nearby lakes hold higher grades.
- AMarl LakeBruce · 8.1 mi · Higher grade (B → A)
- ANorth Louise LakeGrey · 1.4 mi · Higher grade (B → A)
- APearl LakeBruce · 6.5 mi · Higher grade (B → A)
- AMccullough LakeGrey · 7.1 mi · Higher grade (B → A)
- AWilder LakeGrey · 13.5 mi · Higher grade (B → A)
Nearby Lakes in Grey
Explore Boyd 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 Boyd 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: 2025-10-26
Monitoring stations: