What is the water quality grade for Lake Frederick?

Lake Frederick in Frederick County, Virginia received a water quality grade of A (Excellent). Water clarity: 9.8 ft visibility. Phosphorus: 10 µg/L. Chlorophyll-a (algae): 3 µg/L.

Is Lake Frederick safe to swim in?

Excellent for swimming, crystal clear water with minimal algae. Lake Frederick has an overall water quality grade of A. Algae concentration (chlorophyll-a) is 3 µg/L. Always check local health department advisories before swimming.

Frederick County, Virginia

Lake Frederick

Grade AExcellent · 9.8 ft clarity

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Mesotrophic

Lake Frederick is a mesotrophic lake in Frederick County, Virginia. Water quality is graded A based on 2 sampling years through 2026. Compared to the 2 other monitored lakes in Frederick County, Lake Frederick ranks #1 for water quality.

Source: EPA Water Quality Portal sampling records, Virginia DNR, last sampled 2026-07-07. Grade methodology: LakeGrade methodology.

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Swimming Safety

Excellent for swimming, crystal clear water with minimal algae

Water Quality Grade: A, Excellent

Moderate clarity, visible to about 9.8 ft. Phosphorus level: 10 µg/L. Chlorophyll-a: 3 µg/L. Trophic State Index: 41.

Metric	Value	Grade
Water Clarity (Secchi Depth)	9.8 ft	B
Phosphorus	10 µg/L	A
Chlorophyll-a (Algae)	3 µg/L	A
Trophic State Index (TSI)	41	Mesotrophic

Moderate nutrients, good water quality

Where to stay near Lake Frederick

Compare lakeside cabins, hotels, and vacation rentals near Lake Frederick in Frederick County, Virginia — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.

Top-rated places to stay near Lake Frederick