Loudoun County Lake Quality
Virginia, 3 lakes, average grade B (Good)
Loudoun County has 3 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, Loudoun 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 Beaverdam Creek Reservior Lake (A); the most-stressed is Goose Creek Reservoir (B).
Quick Answers for Loudoun County
Planning a trip? Check special fishing regulations for Beaverdam Creek Reservior Lake — or check the official Virginia fishing regulations.
All Lakes in Loudoun County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Beaverdam Creek Reservior Lake | A | 4.9 ft | 10 µg/L |
| 2 | Beaverdam Creek Reservoir | A | 5.4 ft | 10 µg/L |
| 3 | Goose Creek Reservoir | B | 2.1 ft | 60 µg/L |
Other Counties in Virginia
See how Loudoun 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 Loudoun County
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Source: EPA National Aquatic Resource Surveys, 2026.