What is the water quality grade for Aquilla Reservoir?

Aquilla Reservoir in Hill County, Texas received a water quality grade of D (Poor). Water clarity: 2.1 ft visibility. Phosphorus: 40 µg/L. Chlorophyll-a (algae): 43.2 µg/L.

Is Aquilla Reservoir safe to swim in?

Swimming not recommended, poor water quality with high algae risk. Aquilla Reservoir has an overall water quality grade of D. Algae concentration (chlorophyll-a) is 43.2 µg/L. Always check local health department advisories before swimming.

Hill County, Texas

Aquilla Reservoir

Grade DPoor · 2.1 ft clarity

Find places to stay →

Eutrophic

Aquilla Reservoir is a productive, nutrient-rich eutrophic lake in Hill County, Texas. Water quality is graded D based on 2 sampling years through 2025. Compared to the 4 other monitored lakes in Hill County, Aquilla Reservoir ranks #3 for water quality.

Source: EPA Water Quality Portal sampling records, Texas DNR, last sampled 2025-10-22. Grade methodology: LakeGrade methodology.

Watch Aquilla Reservoir water quality

Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.

Swimming Safety

Swimming not recommended, poor water quality with high algae risk

Water Quality Grade: D, Poor

Very murky, less than 2.1 ft of visibility. Phosphorus level: 40 µg/L. Chlorophyll-a: 43.2 µg/L. Trophic State Index: 64.

Metric	Value	Grade
Water Clarity (Secchi Depth)	2.1 ft	F
Phosphorus	40 µg/L	C
Chlorophyll-a (Algae)	43.2 µg/L	F
Trophic State Index (TSI)	64	Eutrophic

High nutrients, frequent algae, reduced clarity

Where to stay near Aquilla Reservoir

Compare lakeside cabins, hotels, and vacation rentals near Aquilla Reservoir in Hill 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.

Top-rated places to stay near Aquilla Reservoir

Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.

Planning a trip to Aquilla Reservoir?

Get lake water-quality report cards plus the best cabin & lodging deals near Aquilla Reservoir — straight to your inbox. No spam, unsubscribe anytime.