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How deep are water wells in Cross Mountain, Texas?

Home water wells in and around Cross Mountain, Texas are typically 566 to 800 feet deep (median 698 ft, 114 wells drilled in the last 10 years). Nearly all draw from the Middle Trinity (94%), according to the state's Hill Country Trinity model (TWDB). New wells run about 29% deeper than 20 years ago (median 540 ft in 2003 to 2007, 695 ft in 2021 to 2025). Estimated cost of a complete well at the median depth: $20,000 to $48,500.

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 Cross Mountain, TexasUnderground column at the center of Cross Mountain: median well 698 ft, middle half 566 to 800 ft, water at 352 ft, and the layers of the state's model with their thickness.Upper Trinity: 0 to 362 ftUpper TrinityMiddle Trinity: 362 to 812 ftMiddle TrinityLower Trinity: 812 to 1,221 ftLower Trinitycontinues to 1,221 ft02004006008001,000ftGround level · 1,322 ft above sea levelMedian well: 698 ftWater standing in the well from 352 ftWater level352 ftMiddle half566–800 ftMedian well698 ft

Under Cross Mountain, Bexar County

Layers at the center of Cross Mountain from TWDB's Hill Country Trinity model (1 mile cells), at true depth scale. The well and the water are the median of 114 real wells.

Home wells in and around Cross Mountain

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: Cross Mountain and about 2 miles around it

Key figures

Typical depth (middle half)
566 to 800 feet
Median depth
698 feet
Deepest 10% are past
888 feet
Water level (median)
352 feet
94 wells
Yield (median)
30 gpm
89 wells, gallons per minute
Wells used
114
In the last 10 years
Inside the city limits
149
the rest within 2 miles
All years on file
386
median 630 ft, since 1994
Confidence
Standard (30 or more wells)

When the wells were finished, the water stood a median 352 feet below the surface (94 wells).

What is under Cross Mountain, TexasUnderground column at the center of Cross Mountain: median well 698 ft, middle half 566 to 800 ft, water at 352 ft, and the layers of the state's model with their thickness.Upper Trinity: 0 to 362 ftUpper TrinityMiddle Trinity: 362 to 812 ftMiddle TrinityLower Trinity: 812 to 1,221 ftLower Trinitycontinues to 1,221 ft02004006008001,000ftGround level · 1,322 ft above sea levelMedian well: 698 ftWater standing in the well from 352 ftWater level352 ftMiddle half566–800 ftMedian well698 ft
Layers at the center of Cross Mountain from TWDB's Hill Country Trinity model (1 mile cells), at true depth scale. The well and the water are the median of 114 real wells.

Which formation do wells in Cross Mountain draw from?

Nearly all draw from the Middle Trinity (94%), according to the state's Hill Country Trinity model (TWDB).

Only 71% bottom out inside the Middle Trinity: the rest keep going deeper but take their water from that layer.

Layer (state's model)ShareWellsTypical depth (ft)
Middle Trinity94%107570–800
Lower Trinity6%7530–600

For 99% of these wells the report says where the water enters (the screen or the open hole), and we use the middle of that interval.

The layers under the center of Cross Mountain

From the state's model, at 1,322 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 marl0362362
Middle Trinitylimestone and sand362812451
Lower Trinitysand and limestone8121,221408

Depth over time

New home wells in and around Cross Mountain are deeper than 20 years ago: the median went from 540 feet (2003 to 2007) to 695 feet (2021 to 2025), 29% more. Deeper wells do not always mean the water dropped: a driller may be going for another layer, better water or more reserve.

PeriodMedian depth (ft)Wells
2001–200554078
2006–2010605121
2011–201570561
2016–202066049
2021–202569567
2026under 10 wells8

What a well costs in Cross Mountain

At the median depth for Cross Mountain (698 feet), a complete home well would cost roughly $20,000 to $48,500: $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 (566 to 800 feet) the range runs from $16,500 to $54,500. 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 Cross Mountain, Texas?

Home water wells in and around Cross Mountain, Texas are typically 566 to 800 feet deep (median 698 ft, 114 wells drilled in the last 10 years). One in ten goes past 888 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 Cross Mountain draw from?

Nearly all draw from the Middle Trinity (94%), according to the state's Hill Country Trinity model (TWDB). This is an estimate from the state's regional model, not a survey of the lot.

How much does a water well cost in Cross Mountain?

At the median depth (698 feet), a complete well would cost roughly $20,000 to $48,500, 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 Cross Mountain?

When the wells were finished, the water stood a median 352 feet below the surface (94 wells). The level moves with drought and from one well to the next.

Do I need a permit to drill a well in Cross Mountain?

Cross Mountain 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.

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.

For 99% of these wells the report says where the water enters (the screen or the open hole), and we use the middle of that interval.

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/cross-mountain-tx. License CC BY 4.0. https://doi.org/10.5281/zenodo.24126380.

Sources