Union County Lake Quality
Tennessee, 2 lakes, average grade (Not rated)
Only 2 lakes in Union 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 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 Blue Springs Hollow Embayment of Powell River Arm of Norris Reservoir (—); the most-stressed is Blue Springs Hollow Embayment of Powell River Arm of Norris Reservoir (—).
Quick Answers for Union County
Planning a trip? Check special fishing regulations for Blue Springs Hollow Embayment of Powell River Arm of Norris Reservoir — or check the official Tennessee fishing regulations.
All Lakes in Union County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Blue Springs Hollow Embayment of Powell River Arm of Norris Reservoir | - | 10 µg/L | |
| 2 | Powell River Embayment of Norris Reservoir | - | 10 µg/L |
Other Counties in Tennessee
See how Union County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 36 states and 2 Canadian provinces.
Where to stay near Union County
Top-rated places to stay near Union County
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Source: EPA National Aquatic Resource Surveys, 2026.