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How deep are water wells in The Hills, Texas?

Home water wells in and around The Hills, Texas are typically 582 to 875 feet deep (median 790 ft, 79 wells reported since 2001). No single layer dominates: 53% are completed in the Lower Trinity and 44% end near or below the base of the Trinity, according to the state's Hill Country Trinity model (TWDB). Estimated cost of a complete well at the median depth: $22,500 to $54,000.

Updated every day from Texas Water Development Board driller reports. Last update: November 11, 2026, using the state file of November 10, 2026.

See the wells and layers at an exact pointTravis County
What is under The Hills, TexasUnderground column at the center of The Hills: median well 790 ft, middle half 582 to 875 ft, water at 431 ft, and the layers of the state's model with their thickness.Upper Trinity: 0 to 54 ftUpper TrinityMiddle Trinity: 54 to 342 ftMiddle TrinityLower Trinity: 342 to 670 ftLower TrinityBelow the base of the Trinity02505007501,0001,250ftGround level · 889 ft above sea levelMedian well: 790 ftWater standing in the well from 431 ftWater level431 ftMiddle half582–875 ftMedian well790 ft

Under The Hills, Travis County

Layers at the center of The Hills from TWDB's Hill Country Trinity model (1 mile cells), at true depth scale. The well and the water are the median of 79 real wells.

Home wells in and around The Hills

Each dot is a home well from a state driller report, colored by depth. Tap one for its details and official report. Tap an empty spot to see what is under that point.

See underground

Well depth (ft)

  • <100
  • 100
  • 200
  • 300
  • 400
  • 600
  • 800+

Dashed line: The Hills and about 2 miles around it

Key figures

Typical depth (middle half)
582 to 875 feet
Median depth
790 feet
Deepest 10% are past
910 feet
Water level (median)
431 feet
55 wells
Yield (median)
30 gpm
70 wells, gallons per minute
Wells used
79
Since 2001
Inside the city limits
1
the rest within 2 miles
All years on file
79
median 790 ft, since 2002
Confidence
Standard (30 or more wells)

When the wells were finished, the water stood a median 431 feet below the surface (55 wells).

What is under The Hills, TexasUnderground column at the center of The Hills: median well 790 ft, middle half 582 to 875 ft, water at 431 ft, and the layers of the state's model with their thickness.Upper Trinity: 0 to 54 ftUpper TrinityMiddle Trinity: 54 to 342 ftMiddle TrinityLower Trinity: 342 to 670 ftLower TrinityBelow the base of the Trinity02505007501,0001,250ftGround level · 889 ft above sea levelMedian well: 790 ftWater standing in the well from 431 ftWater level431 ftMiddle half582–875 ftMedian well790 ft
Layers at the center of The Hills from TWDB's Hill Country Trinity model (1 mile cells), at true depth scale. The well and the water are the median of 79 real wells.

Which formation do wells in The Hills draw from?

No single layer dominates: 53% are completed in the Lower Trinity and 44% end near or below the base of the Trinity, according to the state's Hill Country Trinity model (TWDB). Read that as the most likely layer, not a certain one: where our method names the Lower Trinity, the state's own aquifer code agrees in about 53% of wells.

52% of the wells bottom out near or below the base of the Trinity in the model, often within tens of feet of it; older rock may lie there.

Layer (state's model)ShareWellsTypical depth (ft)
Lower Trinity53%42430–840
Near or below the base of the Trinity44%35782–889
Upper Trinity1%1—
Middle Trinity1%1—

Only 29% of these wells have the water-bearing interval on their report (reports before about 2012 rarely do). For the others we use the bottom of the hole, which tends to read one layer deeper than where the water actually comes from.

The layers under the center of The Hills

From the state's model, at 889 feet above sea level. These are the model's depths at that one point, not those of any particular lot.

Depths in feet below ground.
Layer (state's model)Top (ft)Bottom (ft)Thickness (ft)
Upper Trinitylimestone and marl05454
Middle Trinitylimestone and sand54342288
Lower Trinitysand and limestone342670327

Depth over time

There are not enough wells in both 2003 to 2007 and 2021 to 2025 (at least 30 in each) to say with confidence whether wells in and around The Hills are getting deeper. For reference, the median was 805 feet in 2001 to 2005 (26 wells) and 878 feet in 2016 to 2020 (14 wells).

PeriodMedian depth (ft)Wells
2001–200580526
2006–201066220
2011–201578011
2016–202087814
2021–2025under 10 wells6
2026under 10 wells2

What a well costs in The Hills

At the median depth for The Hills (790 feet), a complete home well would cost roughly $22,500 to $54,000: $25 to $60 per foot for drilling, casing and seal, plus $2,500 to $6,500 for the pump, pressure tank, controls and hookup at the well. Across the whole middle half of depths (582 to 875 feet) the range runs from $17,000 to $59,000. This is TerraFunded's estimate from published Texas prices, not a quote, and it leaves out trenching and the line to the house. Get prices from at least two licensed drillers.

Where it sits

Nearby places

Median depth of home wells in each place.

All Texas cities and towns

Common questions

How deep do you have to drill a well in The Hills, Texas?

Home water wells in and around The Hills, Texas are typically 582 to 875 feet deep (median 790 ft, 79 wells reported since 2001). One in ten goes past 910 feet. The depth a given tract needs depends on where it sits and what layers the driller hits.

What aquifer or formation do wells in The Hills draw from?

No single layer dominates: 53% are completed in the Lower Trinity and 44% end near or below the base of the Trinity, according to the state's Hill Country Trinity model (TWDB). Read that as the most likely layer, not a certain one: where our method names the Lower Trinity, the state's own aquifer code agrees in about 53% of wells. This is an estimate from the state's regional model, not a survey of the lot.

How much does a water well cost in The Hills?

At the median depth (790 feet), a complete well would cost roughly $22,500 to $54,000, by TerraFunded's estimate from published Texas driller prices. The real price comes from a licensed driller's quote.

How deep is the water in The Hills?

When the wells were finished, the water stood a median 431 feet below the surface (55 wells). The level moves with drought and from one well to the next.

Do I need a permit to drill a well in The Hills?

The Hills is inside the Southwestern Travis County Groundwater Conservation District. Groundwater conservation districts in Texas can require registering or permitting a new well, keeping set distances from property lines and other wells, and paying fees. Rules differ from district to district: ask the district before drilling.

How these numbers are made

We count new and replacement domestic (home) wells whose coordinates fall inside the place boundary or within 2 miles of it. We use the last 10 years when there are at least 30 wells; otherwise all since 2001. The median is the middle well and the middle half runs from the 25th to the 75th percentile.

To tell which layer a well draws from, we take the ground elevation at its location, subtract the depth of the interval where water enters (or the bottom of the hole when the report does not give one) and see which layer of the state's model that point falls in.

Only 29% of these wells have the water-bearing interval on their report (reports before about 2012 rarely do). For the others we use the bottom of the hole, which tends to read one layer deeper than where the water actually comes from.

How well it works: In 2,665 wells in the Texas Hill Country where the State of Texas recorded the aquifer, our estimate of the formation the well draws from names the same layer of the state's model in about 76% of them, and that layer or the one next to it in at least 98%.

  • The layers come from the Texas Water Development Board's Hill Country Trinity model, with 1 mile cells. It is a regional model, not a survey of any lot: between one model point and the next, the real depth of each layer can differ.
  • "Near or below the base of the Trinity" means the well reaches the bottom of the model or passes it, often by tens of feet. Older rock that the model does not include may lie there.
  • We never use the model's water levels. The water level on this page is the one each driller measured when the well was finished.

These are depths of real wells drilled nearby, not a promise about any property. Groundwater can change over short distances and with drought. A licensed water well driller can tell you what to expect on a specific tract.

Read the full methodology · Download the data (CSV, CC BY 4.0)

How to cite

TerraFunded (2026). Texas Well Atlas: Underground. From Texas Water Development Board driller reports and groundwater availability models (data as of November 10, 2026). https://terrafunded.com/wells/places/the-hills-tx. License CC BY 4.0. https://doi.org/10.5281/zenodo.24126380.

Sources