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How deep are water wells in Terrell Hills, Texas?

Home water wells in and around Terrell Hills, Texas are typically 255 to 520 feet deep (median 300 ft, 31 wells drilled in the last 10 years). Estimated cost of a complete well at the median depth: $10,000 to $24,500.

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 pointBexar County
What is under Terrell Hills, TexasUnderground column at the center of Terrell Hills: median well 300 ft, middle half 255 to 520 ft, water at 145 ft.No state layer model here yet0200400600800ftGround levelMedian well: 300 ftWater standing in the well from 145 ftWater level145 ftMedian well300 ftMiddle half255–520 ft

Under Terrell Hills, Bexar County

The well and the water are the median of 31 real wells. This atlas does not have a state layer model for this area yet.

Home wells in and around Terrell 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: Terrell Hills and about 2 miles around it

Key figures

Typical depth (middle half)
255 to 520 feet
Median depth
300 feet
Deepest 10% are past
580 feet
Water level (median)
145 feet
30 wells
Yield (median)
30 gpm
25 wells, gallons per minute
Wells used
31
In the last 10 years
Inside the city limits
33
the rest within 2 miles
All years on file
54
median 470 ft, since 2008
Confidence
Standard (30 or more wells)

When the wells were finished, the water stood a median 145 feet below the surface (30 wells).

What is under Terrell Hills, TexasUnderground column at the center of Terrell Hills: median well 300 ft, middle half 255 to 520 ft, water at 145 ft.No state layer model here yet0200400600800ftGround levelMedian well: 300 ftWater standing in the well from 145 ftWater level145 ftMedian well300 ftMiddle half255–520 ft
The well and the water are the median of 31 real wells. This atlas does not have a state layer model for this area yet.

Which formation do wells in Terrell Hills draw from?

We cannot say yet for Terrell Hills. This atlas assigns layers with the TWDB layered models processed so far (the Northern Trinity and Woodbine model, the Hill Country Trinity model, the northern Gulf Coast Aquifer model and the High Plains Aquifer System model), and none covers this area with enough wells. The depth, water level and yield on this page do come from the real wells here.

See the aquifers mapped under Bexar County

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 Terrell Hills are getting deeper. For reference, the median was 500 feet in 2011 to 2015 (15 wells) and 280 feet in 2021 to 2025 (21 wells).

PeriodMedian depth (ft)Wells
2006–2010under 10 wells1
2011–201550015
2016–202049514
2021–202528021
2026under 10 wells3

What a well costs in Terrell Hills

At the median depth for Terrell Hills (300 feet), a complete home well would cost roughly $10,000 to $24,500: $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 (255 to 520 feet) the range runs from $9,000 to $37,500. 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 Terrell Hills, Texas?

Home water wells in and around Terrell Hills, Texas are typically 255 to 520 feet deep (median 300 ft, 31 wells drilled in the last 10 years). One in ten goes past 580 feet. The depth a given tract needs depends on where it sits and what layers the driller hits.

How much does a water well cost in Terrell Hills?

At the median depth (300 feet), a complete well would cost roughly $10,000 to $24,500, 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 Terrell Hills?

When the wells were finished, the water stood a median 145 feet below the surface (30 wells). The level moves with drought and from one well to the next.

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

Terrell Hills is inside the Edwards Aquifer Authority. 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.

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/terrell-hills-tx. License CC BY 4.0. https://doi.org/10.5281/zenodo.24126380.

Sources