Pierce County Lake Quality
Washington, 12 lakes, average grade B (Good)
Only 12 lakes in Pierce 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, Pierce 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 (A); the most-stressed is Carp Lake (D).
Quick Answers for Pierce County
Planning a trip? Check special fishing regulations for Nla Lake — or check the official Washington fishing regulations.
All Lakes in Pierce County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Nla Lake | A | - | 19.6 µg/L |
| 2 | Gravelly Lake | A | 25.4 ft | - |
| 3 | American Lake | A | 19.7 ft | - |
| 4 | Steilacoom Lake | A | 17.4 ft | - |
| 5 | Lake Louise | A | 17.1 ft | - |
| 6 | Nla Lake | B | 16.4 ft | 4504.1 µg/L |
| 7 | Nla Lake | C | 10.9 ft | 11510.7 µg/L |
| 8 | Carp Lake | D | 6.6 ft | - |
| 9 | Waughop Lake | D | 5.6 ft | - |
| 10 | Debra Jane Lake | D | 3.9 ft | - |
| 11 | Bonney Lake | D | 5.2 ft | - |
Other Counties in Washington
See how Pierce 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 Pierce County
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Source: EPA National Aquatic Resource Surveys, 2026.