Loudoun County Lake Quality
Virginia, 5 lakes, measured by Virginia DEQ
Loudoun County has 5 monitored 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. 2 of those lakes carry recent nutrient and algae readings. The county-level summary describes that subset, not every water body listed. Taken together, the monitored lakes of Loudoun County sit near the low-nutrient end of the Virginia range.
The county's lakes lean shallow, which makes the readings sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest measured lake is Goose Creek Reservoir.
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Quick Answers for Loudoun County
Planning a trip? Check special fishing regulations for Goose Creek Reservoir — or check the official Virginia fishing regulations.
All Lakes in Loudoun County
5 lakes · 2 ranked on readings, 3 without enough sampling2 lakes ranked on readings · 3 without enough sampling, hidden
| # | Lake | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|
| 1 | Goose Creek ReservoirLoudoun | 2.1 ft | 65 µg/L | 2.1 µg/L | No recent samples | Not recorded |
| 2 | Beaverdam Creek ReservoirLoudoun | 5.4 ft | 10 µg/L | 4 µg/L | No recent samples | Not recorded |
| Sleeter LakeLoudoun | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| Oliver LakeLoudoun | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| Dulles Airport PondLoudoun | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded |
NR = no nutrient or algae reading on record. The measurements are published as the authority reports them. Where the data comes from.
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Source: the Virginia Department of Environmental Quality. See data sources.