Cleanest Lakes in Arizona
Nla Lake in Yavapai County leads the rankings with a water quality grade of A and 16.6 ft of clarity. Below are the top 21 cleanest monitored lakes in Arizona, ranked by EPA water quality score.
Ranked List
| # | Lake | County | Grade | Clarity | Phosphorus | Algae |
|---|---|---|---|---|---|---|
| 1 | Nla Lake | Yavapai | A | 16.6 ft | 12.9 µg/L | 1.3 µg/L |
| 2 | Nla Lake | Cochise | A | 8.4 ft | 13.6 µg/L | 3.7 µg/L |
| 3 | Nla Lake | Coconino | A | 10 ft | 13.8 µg/L | 4 µg/L |
| 4 | Nla Lake | Maricopa | A | 10 ft | 9.4 µg/L | 3.8 µg/L |
| 5 | Ak-Chin Reservoir | Pinal | B | - | 27 µg/L | 4.2 µg/L |
| 6 | Nla Lake | Maricopa | C | 5.6 ft | 49.1 µg/L | 16.5 µg/L |
| 7 | Nla Lake | Maricopa | C | 5.1 ft | 38000 µg/L | 1.6 µg/L |
| 8 | Nla Lake | Maricopa | C | 4 ft | 39.9 µg/L | 10.6 µg/L |
| 9 | Nla Lake | Yuma | C | 1.5 ft | 39.4 µg/L | 7.9 µg/L |
| 10 | Nla Lake | Graham | C | 2.8 ft | 38000 µg/L | 6.5 µg/L |
| 11 | Nla Lake | Navajo | C | 1 ft | 79000 µg/L | 6.2 µg/L |
| 12 | Nla Lake | Maricopa | C | 9 ft | 67000 µg/L | 4.6 µg/L |
| 13 | Nla Lake | Coconino | D | 5.7 ft | 75000 µg/L | 10.4 µg/L |
| 14 | Nla Lake | Apache | D | 0.9 ft | 161.1 µg/L | 9.1 µg/L |
| 15 | Nla Lake | La Paz | D | 4.9 ft | 37000 µg/L | 9.1 µg/L |
| 16 | Nla Lake | Yavapai | D | - | 192.1 µg/L | 17.5 µg/L |
| 17 | Nla Lake | Apache | D | 5.1 ft | 468 µg/L | 32.1 µg/L |
| 18 | Nla Lake | Yuma | F | 0.1 ft | 392000 µg/L | 232.2 µg/L |
| 19 | Nla Lake | Coconino | F | 2.5 ft | 396.6 µg/L | 68.2 µg/L |
| 20 | Nla Lake | Coconino | F | 0.9 ft | 518.9 µg/L | 145.1 µg/L |
| 21 | Nla Lake | Apache | F | 0.9 ft | 882000 µg/L | 224.2 µg/L |