What is the water quality grade for Hidden Valley Lake?

Hidden Valley Lake in Washington County, Virginia received a water quality grade of A (Excellent). Water clarity: 9.7 ft visibility. Phosphorus: 10 µg/L. Chlorophyll-a (algae): 3.1 µg/L.

Is Hidden Valley Lake safe to swim in?

Excellent for swimming, crystal clear water with minimal algae. Hidden Valley Lake has an overall water quality grade of A. Algae concentration (chlorophyll-a) is 3.1 µg/L. Always check local health department advisories before swimming.

Washington County, Virginia

Hidden Valley Lake

Grade AExcellent · 9.7 ft clarity

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Mesotrophic

Hidden Valley Lake is a mesotrophic lake in Washington County, Virginia. Water quality is graded A based on 2 sampling years through 2024. Compared to the 1 other monitored lakes in Washington County, Hidden Valley Lake ranks #1 for water quality.

Source: EPA Water Quality Portal sampling records, Virginia DNR, last sampled 2024-10-22. 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 9.7 ft. Phosphorus level: 10 µg/L. Chlorophyll-a: 3.1 µg/L. Trophic State Index: 41.

Metric	Value	Grade
Water Clarity (Secchi Depth)	9.7 ft	B
Phosphorus	10 µg/L	A
Chlorophyll-a (Algae)	3.1 µg/L	B
Trophic State Index (TSI)	41	Mesotrophic

Moderate nutrients, good water quality

Where to stay near Hidden Valley Lake

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