Middlesex County Lake Quality
Ontario, 1 lakes, average grade D (Poor)
Only 1 lakes in Middlesex 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. On average, Middlesex County lakes grade D, with phosphorus loading and reduced clarity showing up across most of the dataset.
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 Fanshawe Lake (D); the most-stressed is Fanshawe Lake (D).
Quick Answers for Middlesex County
Planning a trip? Check special fishing regulations for Fanshawe Lake — or check the official Ontario fishing regulations.
All Lakes in Middlesex County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Fanshawe Lake | D | 2.6 ft | 46.1 µg/L |
Other Counties in Ontario
See how Middlesex County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 38 states.
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Source: EPA National Aquatic Resource Surveys, 2026.