Washington County Lake Quality
Virginia, 2 lakes, average grade B (Good)
Washington County has 2 graded lakes — a thin enough sample that one or two stressed lakes can move the county average noticeably. Use the per-lake pages below for what actually matters. With an average grade of B, Washington County sits comfortably above the {{stateName}} median.
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 Hidden Valley Lake (A); the most-stressed is South Holston Lake (B).
Quick Answers for Washington County
Planning a trip? Check special fishing regulations for Hidden Valley Lake — or check the official Virginia fishing regulations.
All Lakes in Washington County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Hidden Valley Lake | A | 9.7 ft | 10 µg/L |
| 2 | South Holston Lake | B | 7.2 ft | 20 µg/L |
Other Counties in Virginia
See how Washington 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 Washington County
Top-rated places to stay near Washington County
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Source: EPA National Aquatic Resource Surveys, 2026.