Douglas County Lake Quality
Washington, 1 lakes, average grade B (Good)
Only 1 lakes in Douglas 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. With an average grade of B, Douglas County sits comfortably above the {{stateName}} median.
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 Nla Lake (B); the most-stressed is Nla Lake (B).
Quick Answers for Douglas County
Planning a trip? Check special fishing regulations for Nla Lake — or check the official Washington fishing regulations.
All Lakes in Douglas County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Nla Lake | B | 13 ft | 55.9 µg/L |
Other Counties in Washington
See how Douglas 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 Douglas County
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Source: EPA National Aquatic Resource Surveys, 2026.