Parry Sound District County, Ontario · Water Quality Report Card
Mcnaught Lake
Mcnaught Lake in Parry Sound District, Ontario received a water quality grade of B (Good). Water clarity: 2.7 m visibility. Phosphorus: 9.6 µg/L.
- Clarity
- 2.7 m
- Type
- Mesotrophic
Mcnaught Lake is a mesotrophic lake in Parry Sound District County, Ontario. Water quality is graded B based on 2 sampling years through 2025. Compared to the 230 other monitored lakes in Parry Sound District County, Mcnaught Lake ranks #166 for water quality.
Source: EPA Water Quality Portal sampling records, Ontario MECP, last sampled 2025-05-23. 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 8.9 ft. Phosphorus level: 9.6 µg/L. Trophic State Index: 41.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.7 m | C |
| Phosphorus | 9.6 µg/L | A |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 41 | Mesotrophic |
Moderate nutrients, good water quality
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Fishing Mcnaught Lake
Location
County Ranking
Ranked #166 of 231 lakes in Parry Sound District
Cleaner Lakes Within 30 Miles
Mcnaught Lake holds Grade B. 3 nearby lakes hold higher grades.
- ALane LakeParry Sound District · 1.2 mi · Higher grade (B → A)
- ABack LakeParry Sound District · 1.4 mi · Higher grade (B → A)
- AFaris LakeParry Sound District · 1.8 mi · Higher grade (B → A)
Nearby Lakes in Parry Sound District
Explore Mcnaught 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 Mcnaught 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: 2025-05-23
Monitoring stations: