Perry County Lake Quality
Missouri, 5 lakes, average grade A (Excellent)
Perry County holds 5 monitored lakes. With a sample that small the county-level summary describes those specific waters, not necessarily every water body in the county. 3 of those lakes carry an A–F grade. The county-level summary describes that subset, not every water body listed. The county's average grade is A — among the cleanest in Missouri. 3 lakes pull an A on their own, and almost none fall into the D or F brackets.
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 Port Perry Lake (A); the most-stressed is Port Perry Lake (A).
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Quick Answers for Perry County
Planning a trip? Check special fishing regulations for Port Perry Lake — or check the official Missouri fishing regulations.
All Lakes in Perry County
5 lakes · 3 graded, 2 not rated3 graded lakes · 2 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | APort Perry LakePerry | A | 12 ft | 8.3 µg/L | 2.1 µg/L | No recent samples | Not recorded |
| 2 | APort Perry Lake South ArmPerry | A | 9.5 ft | 8.3 µg/L | 2.3 µg/L | No recent samples | Not recorded |
| 3 | APort Perry Lake North ArmPerry | A | 7.4 ft | 9.5 µg/L | 2.9 µg/L | No recent samples | Not recorded |
| NRPerry County Community LakePerry | NR | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRLake Kah-Tan-DaPerry | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded |
NR = not rated: there is not enough recent sampling to support a letter. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.
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Other Counties in Missouri
See how Perry County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all United States (49 states), Canada (Ontario, Québec, Nova Scotia, British Columbia and Newfoundland and Labrador), and 38 other country hubs..
Source: EPA National Aquatic Resource Surveys, 2026.