La Paz County Lake Quality
Arizona, 2 lakes, average grade C (Fair)
Only 2 lakes in La Paz 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 Alamo Lake (C); the most-stressed is Nla Lake (D).
Quick Answers for La Paz County
Planning a trip? Check special fishing regulations for Alamo Lake — or check the official Arizona fishing regulations.
All Lakes in La Paz County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Alamo Lake | C | 13 ft | 41 µg/L |
| 2 | Nla Lake | D | 4.9 ft | 37000 µg/L |
Other Counties in Arizona
See how La Paz 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 La Paz County
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Source: EPA National Aquatic Resource Surveys, 2026.