Apache County Lake Quality
Arizona, 11 lakes, average grade D (Poor)
Only 11 lakes in Apache 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-wide average grade is D — water quality issues are persistent across most of the monitored basins. 5 lakes fall into the F bracket outright.
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 (D); the most-stressed is Nla Lake (F).
Quick Answers for Apache County
Planning a trip? Check special fishing regulations for Nla Lake — or check the official Arizona fishing regulations.
All Lakes in Apache County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Nla Lake | D | 0.9 ft | 161.1 µg/L |
| 2 | Tunnel Reservoir | D | 6.7 ft | 66 µg/L |
| 3 | River Reservoir | D | 4.9 ft | 76 µg/L |
| 4 | Bunch Reservoir | D | 4.1 ft | 66 µg/L |
| 5 | Big Lake | D | 6.7 ft | 76 µg/L |
| 6 | Nla Lake | D | 5.1 ft | 468 µg/L |
| 7 | Nla Lake | F | 0.9 ft | 882000 µg/L |
| 8 | Concho Lake | F | 2.5 ft | 170 µg/L |
| 9 | Luna Lake | F | 1.6 ft | 115 µg/L |
| 10 | Lyman Reservoir | F | 0.3 ft | 160 µg/L |
| 11 | Crescent Lake | F | 5.4 ft | 180 µg/L |
Other Counties in Arizona
See how Apache 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 Apache County
Top-rated places to stay near Apache County
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a trip to Apache County?
Get lake water-quality report cards plus the best cabin & lodging deals near Apache County — straight to your inbox. No spam, unsubscribe anytime.
Source: EPA National Aquatic Resource Surveys, 2026.