What is the water quality grade for Aquilla Reservoir Hackberry Creek Arm?

Aquilla Reservoir Hackberry Creek Arm in Hill County, Texas received a water quality grade of D (Poor). Water clarity: 1.7 ft visibility. Phosphorus: 60 µg/L. Chlorophyll-a (algae): 41.3 µg/L.

Is Aquilla Reservoir Hackberry Creek Arm safe to swim in?

Swimming not recommended, poor water quality with high algae risk. Aquilla Reservoir Hackberry Creek Arm has an overall water quality grade of D. Algae concentration (chlorophyll-a) is 41.3 µg/L. Always check local health department advisories before swimming.

Hill County, Texas

Aquilla Reservoir Hackberry Creek Arm

Grade DPoor · 1.7 ft clarity

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Eutrophic

Aquilla Reservoir Hackberry Creek Arm is a productive, nutrient-rich eutrophic lake in Hill County, Texas. Water quality is graded D based on 2 sampling years through 2026. Compared to the 4 other monitored lakes in Hill County, Aquilla Reservoir Hackberry Creek Arm ranks #5 for water quality.

Source: EPA Water Quality Portal sampling records, Texas DNR, last sampled 2026-02-03. 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 1.7 ft of visibility. Phosphorus level: 60 µg/L. Chlorophyll-a: 41.3 µg/L. Trophic State Index: 66.

Metric	Value	Grade
Water Clarity (Secchi Depth)	1.7 ft	F
Phosphorus	60 µg/L	D
Chlorophyll-a (Algae)	41.3 µg/L	F
Trophic State Index (TSI)	66	Eutrophic

High nutrients, frequent algae, reduced clarity

Where to stay near Aquilla Reservoir Hackberry Creek Arm

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