Cleanest Lakes in Tennessee
Nla Lake in Polk County leads the rankings with a water quality grade of A and 5.4 ft of clarity. Below are the top 16 cleanest monitored lakes in Tennessee, ranked by EPA water quality score.
Ranked List
| # | Lake | County | Grade | Clarity | Phosphorus | Algae |
|---|---|---|---|---|---|---|
| 1 | Nla Lake | Polk | A | 5.4 ft | 15.2 µg/L | 1.3 µg/L |
| 2 | Nla Lake | Marion | B | 6.7 ft | 41.3 µg/L | 3 µg/L |
| 3 | Nla Lake | Greene | B | 2.5 ft | 59.2 µg/L | 1.1 µg/L |
| 4 | Nla Lake | Polk | C | 16.4 ft | 21000 µg/L | 2.4 µg/L |
| 5 | Nla Lake | Stewart | C | 4.1 ft | 39.8 µg/L | 13.8 µg/L |
| 6 | Nla Lake | Sullivan | C | 10.3 ft | 13000 µg/L | 5.1 µg/L |
| 7 | Cumberland River Lake | Stewart | C | - | 82.6 µg/L | 12.5 µg/L |
| 8 | Nla Lake | Madison | D | 3.4 ft | 42000 µg/L | 18.7 µg/L |
| 9 | Nla Lake | Hardeman | D | 2.2 ft | 48000 µg/L | 18.6 µg/L |
| 10 | Nla Lake | McNairy | D | 2.4 ft | 43000 µg/L | 19.2 µg/L |
| 11 | Nla Lake | Putnam | D | 1.6 ft | 179570.2 µg/L | 28.6 µg/L |
| 12 | Nla Lake | Davidson | D | 2.2 ft | 25524.3 µg/L | 26.6 µg/L |
| 13 | Nla Lake | Maury | F | 1.5 ft | 591.7 µg/L | 49.5 µg/L |
| 14 | Nla Lake | Bedford | F | 1.1 ft | 589 µg/L | 87.4 µg/L |
| 15 | Nla Lake | Shelby | F | 2 ft | 120000 µg/L | 71.8 µg/L |
| 16 | Nla Lake | Marshall | F | 2.1 ft | 107.8 µg/L | 60.3 µg/L |