What is the water quality grade for Goose Creek Reservoir?

Goose Creek Reservoir in Loudoun County, Virginia received a water quality grade of B (Good). Water clarity: 2.1 ft visibility. Phosphorus: 60 µg/L. Chlorophyll-a (algae): 2.3 µg/L.

Is Goose Creek Reservoir safe to swim in?

Good for swimming, clear water with low algae levels. Goose Creek Reservoir has an overall water quality grade of B. Algae concentration (chlorophyll-a) is 2.3 µg/L. Always check local health department advisories before swimming.

Loudoun County, Virginia

Goose Creek Reservoir

Grade BGood · 2.1 ft clarity

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Eutrophic

Goose Creek Reservoir is a productive, nutrient-rich eutrophic lake in Loudoun County, Virginia. Water quality is graded B based on 2 sampling years through 2026. Compared to the 2 other monitored lakes in Loudoun County, Goose Creek Reservoir ranks #3 for water quality.

Source: EPA Water Quality Portal sampling records, Virginia DNR, last sampled 2026-06-25. Grade methodology: LakeGrade methodology.

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Swimming Safety

Good for swimming, clear water with low algae levels

Water Quality Grade: B, Good

Very murky, less than 2.1 ft of visibility. Phosphorus level: 60 µg/L. Chlorophyll-a: 2.3 µg/L. Trophic State Index: 56.

Metric	Value	Grade
Water Clarity (Secchi Depth)	2.1 ft	F
Phosphorus	60 µg/L	D
Chlorophyll-a (Algae)	2.3 µg/L	A
Trophic State Index (TSI)	56	Eutrophic

High nutrients, frequent algae, reduced clarity

Where to stay near Goose Creek Reservoir

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