What is the water quality grade for New Marlin City Lake?

New Marlin City Lake in Falls County, Texas received a water quality grade of F (Very Poor). Water clarity: 1.5 ft visibility. Phosphorus: 130 µg/L. Chlorophyll-a (algae): 62 µg/L.

Is New Marlin City Lake safe to swim in?

Avoid swimming, very poor water quality, potential algae toxins. New Marlin City Lake has an overall water quality grade of F. Algae concentration (chlorophyll-a) is 62 µg/L. Always check local health department advisories before swimming.

Falls County, Texas

New Marlin City Lake

Grade FVery Poor · 1.5 ft clarity

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Hypereutrophic

New Marlin City Lake is a highly nutrient-loaded hypereutrophic lake in Falls County, Texas. Water quality is graded F based on 2 sampling years through 2026.

Source: EPA Water Quality Portal sampling records, Texas DNR, last sampled 2026-02-10. Grade methodology: LakeGrade methodology.

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Swimming Safety

Avoid swimming, very poor water quality, potential algae toxins

Water Quality Grade: F, Very Poor

Very murky, less than 1.5 ft of visibility. Phosphorus level: 130 µg/L. Chlorophyll-a: 62 µg/L. Trophic State Index: 72.

Metric	Value	Grade
Water Clarity (Secchi Depth)	1.5 ft	F
Phosphorus	130 µg/L	F
Chlorophyll-a (Algae)	62 µg/L	F
Trophic State Index (TSI)	72	Hypereutrophic

Very high nutrients, dense algae, poor clarity

Where to stay near New Marlin City Lake

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