Noble County Lake Quality
Ohio, 1 lakes, average grade F (Very Poor)
Only 1 lakes in Noble 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 F — the most-stressed bracket in our rubric. Most monitored lakes here show persistent nutrient loading and algal pressure.
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 Seneca Lake (F); the most-stressed is Seneca Lake (F).
Quick Answers for Noble County
Planning a trip? Check special fishing regulations for Seneca Lake — or check the official Ohio fishing regulations.
All Lakes in Noble County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Seneca Lake | F | 1.7 ft | - |
Other Counties in Ohio
See how Noble County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 15 states.
Where to stay near Noble County
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Source: EPA National Aquatic Resource Surveys, 2026.