Region of Waterloo County, Ontario · Water Quality Report Card
Four Wells Lake
Four Wells Lake in Region of Waterloo, Ontario received a water quality grade of C (Fair). Water clarity: 1 m visibility. Phosphorus: 24 µg/L.
- Clarity
- 1 m
- Type
- Eutrophic
Four Wells Lake is a productive, nutrient-rich eutrophic lake in Region of Waterloo County, Ontario. Water quality is graded C based on 2 sampling years through 2025. Compared to the 4 other monitored lakes in Region of Waterloo County, Four Wells Lake ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, Ontario MECP, last sampled 2025-10-10. Grade methodology: LakeGrade methodology.
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Very murky, less than 3.3 ft of visibility. Phosphorus level: 24 µg/L. Trophic State Index: 55.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1 m | F |
| Phosphorus | 24 µg/L | B |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 55 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Four Wells Lake
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Fishing Four Wells Lake
Location
County Ranking
Ranked #4 of 5 lakes in Region of Waterloo
Cleaner Lakes Within 30 Miles
Four Wells Lake holds Grade C. 4 nearby lakes hold higher grades.
- BSunfish LakeRegion of Waterloo · 5.6 mi · Higher grade (C → B)
- BParadise LakeRegion of Waterloo · 6.8 mi · Higher grade (C → B)
- CPuslinch LakeWellington · 11.6 mi · Higher overall water quality score
- CPuslinch LakeWellington · 13.9 mi · Higher overall water quality score
Nearby Lakes in Region of Waterloo
Explore Four Wells Lake across LakeGrade
More Ontario Lake Rankings
Other Grade C Lakes in Ontario
Eutrophic Lakes in Ontario
More records, surveys & data sources
Where this data comes from
Measurements for Four Wells 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: 2025-10-10
Monitoring stations: