Grey County, Ontario · Water Quality Report Card
Brewster'S Lake
Brewster'S Lake in Grey, Ontario received a water quality grade of A (Excellent). Water clarity: 4.2 m visibility. Phosphorus: 9.2 µg/L.
- Clarity
- 4.2 m
- Type
- Oligotrophic
Brewster'S Lake is a cold, clear oligotrophic lake in Grey County, Ontario. Water quality is graded A based on 2 sampling years through 2025. Compared to the 11 other monitored lakes in Grey County, Brewster'S Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, Ontario MECP, last sampled 2025-09-14. 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 13.8 ft. Phosphorus level: 9.2 µg/L. Trophic State Index: 38.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.2 m | B |
| Phosphorus | 9.2 µg/L | A |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 38 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
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Location
County Ranking
Ranked #2 of 12 lakes in Grey
Nearby Lakes in Grey
Explore Brewster'S Lake across LakeGrade
More Ontario Lake Rankings
Other Grade A Lakes in Ontario
Oligotrophic Lakes in Ontario
More records, surveys & data sources
Where this data comes from
Measurements for Brewster'S 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: 2025-09-14
Monitoring stations: