Durham Region County Lake Quality
Ontario, 2 lakes, average grade B (Good)
Only 2 lakes in Durham Region County carry an active grade. The county-level summary is therefore representative of those specific lakes, not necessarily of every water body in the county. With an average grade of B, Durham Region County sits comfortably above the Ontario median.
The county's lakes lean shallow, which makes the grades sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest lake on the books is Chalk Lake (A); the most-stressed is Wagner Lake (C).
Quick Answers for Durham Region County
Planning a trip? Check special fishing regulations for Chalk Lake — or check the official Ontario fishing regulations.
All Lakes in Durham Region County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Chalk Lake | A | 14.9 ft | 8.4 µg/L |
| 2 | Wagner Lake | C | 5.4 ft | 27.4 µg/L |
Other Counties in Ontario
See how Durham Region County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 38 states.
Where to stay near Durham Region County
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Source: EPA National Aquatic Resource Surveys, 2026.