What is the water quality grade for Falcon Reservoir?

Falcon Reservoir in Zapata County, Texas received a water quality grade of D (Poor). Water clarity: 0.7 ft visibility. Phosphorus: 275 µg/L. Chlorophyll-a (algae): 7.7 µg/L.

Is Falcon Reservoir safe to swim in?

Swimming not recommended, poor water quality with high algae risk. Falcon Reservoir has an overall water quality grade of D. Algae concentration (chlorophyll-a) is 7.7 µg/L. Always check local health department advisories before swimming.

Zapata County, Texas

Falcon Reservoir

Grade DPoor · 0.7 ft clarity

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Hypereutrophic

Falcon Reservoir is a highly nutrient-loaded hypereutrophic lake in Zapata County, Texas. Water quality is graded D based on 2 sampling years through 2023.

Source: EPA Water Quality Portal sampling records, Texas DNR, last sampled 2023-02-14. 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 0.7 ft of visibility. Phosphorus level: 275 µg/L. Chlorophyll-a: 7.7 µg/L. Trophic State Index: 73.

Metric	Value	Grade
Water Clarity (Secchi Depth)	0.7 ft	F
Phosphorus	275 µg/L	F
Chlorophyll-a (Algae)	7.7 µg/L	C
Trophic State Index (TSI)	73	Hypereutrophic

Very high nutrients, dense algae, poor clarity

Where to stay near Falcon Reservoir

Compare lakeside cabins, hotels, and vacation rentals near Falcon Reservoir in Zapata 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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