Thunder Bay District County, Ontario · Water Quality Report Card
Northern Light L. Lake
Northern Light L. Lake in Thunder Bay District, Ontario received a water quality grade of B (Good). Water clarity: 2.6 m visibility. Phosphorus: 11.4 µg/L.
- Clarity
- 2.6 m
- Type
- Mesotrophic
Northern Light L. Lake is a mesotrophic lake in Thunder Bay District County, Ontario. Water quality is graded B based on 2 sampling years through 2025. Compared to the 301 other monitored lakes in Thunder Bay District County, Northern Light L. Lake ranks #186 for water quality.
Source: EPA Water Quality Portal sampling records, Ontario MECP, last sampled 2025-08-01. 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 8.5 ft. Phosphorus level: 11.4 µg/L. Trophic State Index: 43.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.6 m | C |
| Phosphorus | 11.4 µg/L | A |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 43 | Mesotrophic |
Moderate nutrients, good water quality
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Fishing Northern Light L. Lake
Location
County Ranking
Ranked #186 of 302 lakes in Thunder Bay District
Cleaner Lakes Within 30 Miles
Northern Light L. Lake holds Grade B. 2 nearby lakes hold higher grades.
- AIcarus LakeThunder Bay District · 4.6 mi · Higher grade (B → A)
- AAtik L. LakeThunder Bay District · 7.2 mi · Higher grade (B → A)
Nearby Lakes in Thunder Bay District
Explore Northern Light L. 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 Northern Light L. 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: 2025-08-01
Monitoring stations: