Kootenai County Lake Quality
Idaho, 7 lakes, average grade A (Excellent)
Only 7 lakes in Kootenai 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's average grade is A — among the cleanest in {{stateName}}. 6 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 Nla Lake (A); the most-stressed is Nla Lake (C).
Quick Answers for Kootenai County
Planning a trip? Check special fishing regulations for Nla Lake — or check the official Idaho fishing regulations.
All Lakes in Kootenai County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Nla Lake | A | 19.2 ft | 16 µg/L |
| 2 | Usgs Lake | A | - | 4 µg/L |
| 3 | Ideq Lake | A | - | 5 µg/L |
| 4 | Ideq Lake | A | - | 4 µg/L |
| 5 | Ideq Lake | A | - | 3.5 µg/L |
| 6 | Coeur D' Alene Lake | A | - | 9 µg/L |
| 7 | Nla Lake | C | 6.9 ft | 11013.5 µg/L |
Other Counties in Idaho
See how Kootenai County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 34 states.
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Source: EPA National Aquatic Resource Surveys, 2026.