What is the water quality grade for Somerville Lake?

Somerville Lake in Washington County, Texas received a water quality grade of D (Poor). Water clarity: 1.9 ft visibility. Phosphorus: 90 µg/L. Chlorophyll-a (algae): 77.9 µg/L.

Is Somerville Lake safe to swim in?

Swimming not recommended, poor water quality with high algae risk. Somerville Lake has an overall water quality grade of D. Algae concentration (chlorophyll-a) is 77.9 µg/L. Always check local health department advisories before swimming.

Washington County, Texas

Somerville Lake

Grade DPoor · 1.9 ft clarity

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Hypereutrophic

Somerville Lake is a highly nutrient-loaded hypereutrophic lake in Washington County, Texas. Water quality is graded D based on 2 sampling years through 2025. Compared to the 1 other monitored lakes in Washington County, Somerville Lake ranks #1 for water quality.

Source: EPA Water Quality Portal sampling records, Texas DNR, last sampled 2025-11-18. Grade methodology: LakeGrade methodology.

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Swimming Safety

Swimming not recommended, poor water quality with high algae risk

Water Quality Grade: D, Poor

Very murky, less than 1.9 ft of visibility. Phosphorus level: 90 µg/L. Chlorophyll-a: 77.9 µg/L. Trophic State Index: 70.

Metric	Value	Grade
Water Clarity (Secchi Depth)	1.9 ft	F
Phosphorus	90 µg/L	D
Chlorophyll-a (Algae)	77.9 µg/L	F
Trophic State Index (TSI)	70	Hypereutrophic

Very high nutrients, dense algae, poor clarity

Where to stay near Somerville Lake

Compare lakeside cabins, hotels, and vacation rentals near Somerville Lake in Washington County, Texas — 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.

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