Nipissing District County, Ontario · Water Quality Report Card
Lower Hay Lake
Lower Hay Lake in Nipissing District, Ontario received a water quality grade of B (Good). Water clarity: 2.9 m visibility. Phosphorus: 9 µg/L.
- Clarity
- 2.9 m
- Type
- Mesotrophic
Lower Hay Lake is a mesotrophic lake in Nipissing District County, Ontario. Water quality is graded B based on 2 sampling years through 2025. Compared to the 280 other monitored lakes in Nipissing District County, Lower Hay Lake ranks #169 for water quality.
Source: EPA Water Quality Portal sampling records, Ontario MECP, last sampled 2025-08-07. 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 9.5 ft. Phosphorus level: 9 µg/L. Trophic State Index: 40.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.9 m | C |
| Phosphorus | 9 µg/L | A |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 40 | Mesotrophic |
Moderate nutrients, good water quality
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Fishing Lower Hay Lake
Location
County Ranking
Ranked #169 of 281 lakes in Nipissing District
Cleaner Lakes Within 30 Miles
Lower Hay Lake holds Grade B. 3 nearby lakes hold higher grades.
- AGaleairy LakeNipissing District · 5.8 mi · Higher grade (B → A)
- AFarm Bay LakeHaliburton · 7.3 mi · Higher grade (B → A)
- AMeach LakeHastings · 8.1 mi · Higher grade (B → A)
Nearby Lakes in Nipissing District
Explore Lower Hay 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 Lower Hay 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: 2025-08-07
Monitoring stations: