What is the water quality grade for Lake Sweetwater Mid Lake?

Lake Sweetwater Mid Lake in Nolan County, Texas received a water quality grade of C (Fair). Water clarity: 3.6 ft visibility. Phosphorus: 30 µg/L. Chlorophyll-a (algae): 8.3 µg/L.

Is Lake Sweetwater Mid Lake safe to swim in?

Generally safe for swimming, moderate water quality. Lake Sweetwater Mid Lake has an overall water quality grade of C. Algae concentration (chlorophyll-a) is 8.3 µg/L. Always check local health department advisories before swimming.

Nolan County, Texas

Lake Sweetwater Mid Lake

Grade CFair · 3.6 ft clarity

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Eutrophic

Lake Sweetwater Mid Lake is a productive, nutrient-rich eutrophic lake in Nolan County, Texas. Water quality is graded C based on 2 sampling years through 2025.

Source: EPA Water Quality Portal sampling records, Texas DNR, last sampled 2025-08-11. Grade methodology: LakeGrade methodology.

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Swimming Safety

Generally safe for swimming, moderate water quality

Water Quality Grade: C, Fair

Murky, only visible to about 3.6 ft. Phosphorus level: 30 µg/L. Chlorophyll-a: 8.3 µg/L. Trophic State Index: 54.

Metric	Value	Grade
Water Clarity (Secchi Depth)	3.6 ft	D
Phosphorus	30 µg/L	C
Chlorophyll-a (Algae)	8.3 µg/L	C
Trophic State Index (TSI)	54	Eutrophic

High nutrients, frequent algae, reduced clarity

Where to stay near Lake Sweetwater Mid Lake

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