Sandusky County Lake Quality
Ohio, 1 lakes, average grade C (Fair)
Only 1 lakes in Sandusky 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. The county average is C — the middle of the rubric, with one or two lakes pulling the average up or down depending on year.
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 Fremont Reservoir (C); the most-stressed is Fremont Reservoir (C).
Quick Answers for Sandusky County
Planning a trip? Check special fishing regulations for Fremont Reservoir — or check the official Ohio fishing regulations.
All Lakes in Sandusky County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Fremont Reservoir | C | - | 50.1 µg/L |
Other Counties in Ohio
See how Sandusky County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 36 states and 2 Canadian provinces.
Where to stay near Sandusky County
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Source: EPA National Aquatic Resource Surveys, 2026.