Pima County Lake Quality
Arizona, 4 lakes, average grade D (Poor)
Only 4 lakes in Pima 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, Pima County lakes grade D, with phosphorus loading and reduced clarity showing up across most of the dataset.
Most of the county's monitored lakes are shallow — under 50 feet — which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed. Kennedy Lake (C) is the cleanest in the county.
Quick Answers for Pima County
Planning a trip? Check special fishing regulations for Kennedy Lake — or check the official Arizona fishing regulations.
All Lakes in Pima County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Kennedy Lake | C | 1.9 ft | 56.5 µg/L |
| 2 | Lakeside Lake | D | 1.3 ft | 70 µg/L |
| 3 | Rose Canyon Lake | D | 2.8 ft | 72 µg/L |
| 4 | Silverbell Lake | F | 0.8 ft | 100 µg/L |
Other Counties in Arizona
See how Pima County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 34 states.
Where to stay near Pima County
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Source: EPA National Aquatic Resource Surveys, 2026.