Perry County Lake Quality
Ohio, 3 lakes, average grade D (Poor)
Only 3 lakes in Perry 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-wide average grade is D — water quality issues are persistent across most of the monitored basins. 2 lakes fall into the F bracket outright.
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 New Lexington Reservoir (C); the most-stressed is Somerset Reservoir (F).
Quick Answers for Perry County
Planning a trip? Check special fishing regulations for New Lexington Reservoir — or check the official Ohio fishing regulations.
All Lakes in Perry County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | New Lexington Reservoir | C | - | 33.6 µg/L |
| 2 | Somerset Reservoir | F | - | 41.7 µg/L |
| 3 | St Joseph Lake | F | - | 58.9 µg/L |
Other Counties in Ohio
See how Perry 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 Perry County
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Source: EPA National Aquatic Resource Surveys, 2026.