Madison County Lake Quality
Tennessee, 1 lakes, average grade D (Poor)
Only 1 lakes in Madison 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. 0 lakes fall into the F bracket outright.
Most of the county's monitored lakes are shallow — under 50 feet — which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed. Nla Lake (D) is the cleanest in the county.
Quick Answers for Madison County
Planning a trip? Check special fishing regulations for Nla Lake — or check the official Tennessee fishing regulations.
All Lakes in Madison County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Nla Lake | D | 3.4 ft | 42000 µg/L |
Other Counties in Tennessee
See how Madison 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 Madison County
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Source: EPA National Aquatic Resource Surveys, 2026.