Safest Lakes to Swim in Virginia
Nla Lake (Augusta County) ranks #1 for swimming in Virginia — grade A water with low algae and public access. Below: the top 25 lakes in Virginiathat pass our swim-safety filter (grade A/B, chlorophyll-a below 10 µg/L).
Swimming-friendly is a clarity-plus-algae problem: clear water and a low chlorophyll-a number. Nla Lake (A) tops the {{stateName}} list on those combined measures.
The swimming-best list filters more aggressively on chlorophyll-a than the cleanest list — even very clear lakes can have harmful-algal-bloom risk under specific conditions, so the swimming ranking is more conservative on that front.
| Rank | Lake | County | Grade | Swim Safety | Clarity | Algae | Phosphorus | Area |
|---|---|---|---|---|---|---|---|---|
| 1 | Nla Lake | Augusta | A | Low algae | 9.7 ft | 1.6 µg/L | 5.2 µg/L | - |
| 2 | Nla Lake | Patrick | A | Low algae | 11.9 ft | 2.1 µg/L | 7.6 µg/L | - |
| 3 | Mouth of Witcher Cr. Lake | Bedford | A | Low algae | 11.2 ft | 1.9 µg/L | 10 µg/L | - |
| 4 | Lower Blackwater River Lake | Franklin | A | Low algae | 12.1 ft | 2.3 µg/L | 10 µg/L | - |
| 5 | Dam Lake | Franklin | A | Low algae | 12.1 ft | 1.7 µg/L | 10 µg/L | - |
| 6 | Dam Lake | Pittsylvania | A | Low algae | 10.5 ft | 2 µg/L | 10 µg/L | - |
| 7 | Dam Lake | Alleghany | A | Low algae | 12.1 ft | 1.7 µg/L | 10 µg/L | - |
| 8 | Union Bridge Lake | Patrick | A | Low algae | 8.2 ft | 2.7 µg/L | 10 µg/L | - |
| 9 | Hunting Run Reservior Lake | Spotsylvania | A | Low algae | 8.2 ft | 2.2 µg/L | 10 µg/L | - |
| 10 | Goose Point Lake | Franklin | A | Low algae | 10.2 ft | 1.5 µg/L | 10 µg/L | - |
| 11 | Mouth Craddock Cr. Lake | Bedford | A | Low algae | 10.2 ft | 1.6 µg/L | 10 µg/L | - |
| 12 | Above Dam Lake | Albemarle | A | Low algae | 13.1 ft | 1.7 µg/L | 10 µg/L | - |
| 13 | Above Dam Lake | Pulaski | A | Low algae | 9.2 ft | 2.1 µg/L | 10 µg/L | - |
| 14 | Cool Branch Lake | Franklin | A | Low algae | 10.5 ft | 2.1 µg/L | 10 µg/L | - |
| 15 | Confl. Blackwater River Lake | Bedford | A | Low algae | 9.8 ft | 2 µg/L | 10 µg/L | - |
| 16 | Mouth of Bull Run Lake | Franklin | A | Low algae | 10.2 ft | 2.1 µg/L | 10 µg/L | - |
| 17 | Carvins Cove Reservoir | Botetourt | A | Low algae | 11.5 ft | 1.2 µg/L | 10 µg/L | - |
| 18 | Lake Frederick | Frederick | A | Low algae | 9.8 ft | 3 µg/L | 10 µg/L | - |
| 19 | Bolar Mtn. Campground Lake | Bath | A | Low algae | 9.2 ft | 1.8 µg/L | 10 µg/L | - |
| 20 | Mouth Big Lick Cr. Lake | Alleghany | A | Low algae | 12.5 ft | 1.7 µg/L | 10 µg/L | - |
| 21 | Motts Run Reservoir | Spotsylvania | A | Low algae | 10.2 ft | 2.3 µg/L | 10 µg/L | - |
| 22 | Wise Lake | Wise | A | Low algae | 10.5 ft | 2.2 µg/L | 10 µg/L | - |
| 23 | Lake Robertson | Rockbridge | A | Low algae | 13.9 ft | 1.9 µg/L | 10 µg/L | - |
| 24 | West Arm Lake | Pulaski | A | Low algae | 9.2 ft | 2.4 µg/L | 10 µg/L | - |
| 25 | Smith Lake | Stafford | A | Low algae | 8.2 ft | 2.6 µg/L | 10 µg/L | - |
Frequently Asked Questions
What is the best lake to swim in Virginia?
Nla Lake in Augusta County ranks #1 for swimming-safety in our 2026 Virginia dataset, combining grade-A water clarity with low algae and public access. The full top 25 above ranks the swim-safest lakes statewide.
How do you know if a lake is safe to swim in Virginia?
Three signals: (1) water clarity — Secchi depth above 6 feet is a strong sign of low suspended sediment and pathogens; (2) chlorophyll-a below 10 µg/L means low risk of harmful algae bloom; (3) a current grade of A or B from year-round sampling. Virginia DNR and county health departments post seasonal advisories — always check before you swim, especially in late summer when blue-green algae bloom risk peaks.
Are lakes in Virginia safe to swim in?
Most monitored Virginia lakes are safe to swim in under normal conditions, but water quality varies widely. The lakes ranked above are filtered to grade A and B with chlorophyll-a below 10 µg/L — meaning they consistently test cleaner and have lower algae bloom risk than the state average. Always check posted advisories before swimming and avoid water after heavy rain (bacterial contamination spikes from runoff).
What lakes have algae blooms in Virginia?
Algae blooms (especially blue-green / cyanobacteria) are most common in shallow, warm, nutrient-rich (eutrophic) lakes during late summer. Lakes with high phosphorus and chlorophyll-a measurements are at higher risk. The lakes on this page are filtered to exclude high-algae lakes. For the opposite list, see our most-polluted-lakes trend page.
When is it safe to swim in lakes in Virginia?
Virginia lakes are typically safest to swim in late spring through early summer (May–July), when water is cool and algae bloom risk is lowest. Risk rises in late summer and early fall (August–September) when warm water and accumulated nutrients drive cyanobacteria blooms. Always avoid swimming after heavy rainfall (bacterial spikes from runoff) and check current state DNR advisories the day you go.
What's the cleanest lake in Virginia?
The single cleanest lake by combined water-quality score is featured on the Virginia cleanest-lakes page. The lakes here are filtered specifically for swimming safety — same A/B grade requirement, plus low chlorophyll-a (active algae filter). For the broader cleanliness ranking, see /best/cleanest/va.
Our swimming-safety filter
We don't just rank by overall grade. Lakes here have to pass three filters:
- Grade A or B overall water quality (top 40% statewide)
- Chlorophyll-a below 10 µg/L — actively low algae density, low risk of harmful blue-green blooms
- Multi-year sampling data — excludes lakes with limited sampling history (data confidence)
The Swim Safety column adds a direct bacteria signal on top of the grade: where the EPA Water Quality Portal has enough E. coli or fecal-coliform samples, we show a historical swim-safety grade (how often the lake has exceeded the safe-swimming threshold). It is a record of past testing, never a live "safe today" reading — bacteria spike fast after rain.
The ranking within the filter is by combined water-quality score (Secchi clarity + phosphorus + chlorophyll-a). Always check current Virginia DNR advisories before swimming.
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Source: EPA National Aquatic Resource Surveys, 2026.