What is the water quality grade for Lewisville Lake Elm Fork?

Lewisville Lake Elm Fork in Denton County, Texas received a water quality grade of D (Poor). Water clarity: 2.4 ft visibility. Phosphorus: 70 µg/L. Chlorophyll-a (algae): 61.6 µg/L.

Is Lewisville Lake Elm Fork safe to swim in?

Swimming not recommended, poor water quality with high algae risk. Lewisville Lake Elm Fork has an overall water quality grade of D. Algae concentration (chlorophyll-a) is 61.6 µg/L. Always check local health department advisories before swimming.

Denton County, Texas

Lewisville Lake Elm Fork

Grade DPoor · 2.4 ft clarity

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Eutrophic

Lewisville Lake Elm Fork is a productive, nutrient-rich eutrophic lake in Denton County, Texas. Water quality is graded D based on 2 sampling years through 2026. Compared to the 5 other monitored lakes in Denton County, Lewisville Lake Elm Fork ranks #6 for water quality.

Source: EPA Water Quality Portal sampling records, Texas DNR, last sampled 2026-01-13. 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 2.4 ft of visibility. Phosphorus level: 70 µg/L. Chlorophyll-a: 61.6 µg/L. Trophic State Index: 67.

Metric	Value	Grade
Water Clarity (Secchi Depth)	2.4 ft	F
Phosphorus	70 µg/L	D
Chlorophyll-a (Algae)	61.6 µg/L	F
Trophic State Index (TSI)	67	Eutrophic

High nutrients, frequent algae, reduced clarity

Where to stay near Lewisville Lake Elm Fork

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