Leeds and Grenville Counties County, Ontario · Water Quality Report Card
Newboro Lake
Newboro Lake in Leeds and Grenville Counties, Ontario received a water quality grade of A (Excellent). Water clarity: 4.5 m visibility. Phosphorus: 17 µg/L.
- Clarity
- 4.5 m
- Type
- Mesotrophic
Newboro Lake is a mesotrophic lake in Leeds and Grenville Counties County, Ontario. Water quality is graded A based on 2 sampling years through 2025. Compared to the 33 other monitored lakes in Leeds and Grenville Counties County, Newboro Lake ranks #18 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
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
Good clarity, visible to about 14.8 ft. Phosphorus level: 17 µg/L. Trophic State Index: 42.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.5 m | B |
| Phosphorus | 17 µg/L | A |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 42 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Newboro Lake
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Fishing Newboro Lake
Location
County Ranking
Ranked #18 of 34 lakes in Leeds and Grenville Counties
Nearby Lakes in Leeds and Grenville Counties
Explore Newboro Lake across LakeGrade
More Ontario Lake Rankings
Other Grade A Lakes in Ontario
Mesotrophic Lakes in Ontario
More records, surveys & data sources
Where this data comes from
Measurements for Newboro 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: