What is the water quality grade for Navarro Mills Lake?

Navarro Mills Lake in Navarro County, Texas received a water quality grade of C (Fair). Water clarity: 2.2 ft visibility. Phosphorus: 50 µg/L. Chlorophyll-a (algae): 38.6 µg/L.

Is Navarro Mills Lake safe to swim in?

Swim with caution, moderate algae may be present. Navarro Mills Lake has an overall water quality grade of C. Algae concentration (chlorophyll-a) is 38.6 µg/L. Always check local health department advisories before swimming.

Navarro County, Texas

Navarro Mills Lake

Grade CFair · 2.2 ft clarity

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Eutrophic

Navarro Mills Lake is a productive, nutrient-rich eutrophic lake in Navarro County, Texas. Water quality is graded C based on 2 sampling years through 2026.

Source: EPA Water Quality Portal sampling records, Texas DNR, last sampled 2026-01-07. Grade methodology: LakeGrade methodology.

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Swimming Safety

Swim with caution, moderate algae may be present

Water Quality Grade: C, Fair

Very murky, less than 2.2 ft of visibility. Phosphorus level: 50 µg/L. Chlorophyll-a: 38.6 µg/L. Trophic State Index: 64.

Metric	Value	Grade
Water Clarity (Secchi Depth)	2.2 ft	F
Phosphorus	50 µg/L	C
Chlorophyll-a (Algae)	38.6 µg/L	D
Trophic State Index (TSI)	64	Eutrophic

High nutrients, frequent algae, reduced clarity

Where to stay near Navarro Mills Lake

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