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How deep are water wells in Comfort, Texas?

Home water wells in and around Comfort, Texas are typically 358 to 440 feet deep (median 390 ft, 65 wells drilled in the last 10 years). Most draw from the Middle Trinity (55%), and 45% draw from the Lower Trinity, according to the state's Hill Country Trinity model (TWDB). Estimated cost of a complete well at the median depth: $12,500 to $30,000.

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 pointKendall County
What is under Comfort, TexasUnderground column at the center of Comfort: median well 390 ft, middle half 358 to 440 ft, water at 196 ft, and the layers of the state's model with their thickness.Upper Trinity: 0 to 28 ftUpper TrinityMiddle Trinity: 28 to 289 ftMiddle TrinityLower Trinity: 289 to 481 ftLower TrinityBelow the base of the Trinity0200400600ftGround level · 1,426 ft above sea levelMedian well: 390 ftWater standing in the well from 196 ftWater level196 ftMiddle half358–440 ftMedian well390 ft

Under Comfort, Kendall County

Layers at the center of Comfort from TWDB's Hill Country Trinity model (1 mile cells), at true depth scale. The well and the water are the median of 65 real wells.

Home wells in and around Comfort

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: Comfort and about 2 miles around it

Key figures

Typical depth (middle half)
358 to 440 feet
Median depth
390 feet
Deepest 10% are past
524 feet
Water level (median)
196 feet
46 wells
Yield (median)
25 gpm
49 wells, gallons per minute
Wells used
65
In the last 10 years
Inside the city limits
10
the rest within 2 miles
All years on file
141
median 385 ft, since 2002
Confidence
Standard (30 or more wells)

When the wells were finished, the water stood a median 196 feet below the surface (46 wells).

What is under Comfort, TexasUnderground column at the center of Comfort: median well 390 ft, middle half 358 to 440 ft, water at 196 ft, and the layers of the state's model with their thickness.Upper Trinity: 0 to 28 ftUpper TrinityMiddle Trinity: 28 to 289 ftMiddle TrinityLower Trinity: 289 to 481 ftLower TrinityBelow the base of the Trinity0200400600ftGround level · 1,426 ft above sea levelMedian well: 390 ftWater standing in the well from 196 ftWater level196 ftMiddle half358–440 ftMedian well390 ft
Layers at the center of Comfort from TWDB's Hill Country Trinity model (1 mile cells), at true depth scale. The well and the water are the median of 65 real wells.

Which formation do wells in Comfort draw from?

Most draw from the Middle Trinity (55%), and 45% draw from the Lower Trinity, according to the state's Hill Country Trinity model (TWDB).

The bottom of the hole tells a different story: 82% reach the Lower Trinity, although only 45% take their water from it. Many drillers go past the producing layer to leave a reserve.

Layer (state's model)ShareWellsTypical depth (ft)
Middle Trinity55%36314–426
Lower Trinity45%29380–498

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 Comfort

From the state's model, at 1,426 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 marl02828
Middle Trinitylimestone and sand28289261
Lower Trinitysand and limestone289481193

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 Comfort are getting deeper. For reference, the median was 320 feet in 2001 to 2005 (17 wells) and 386 feet in 2021 to 2025 (50 wells).

PeriodMedian depth (ft)Wells
2001–200532017
2006–201033822
2011–201540033
2016–202042918
2021–202538650
2026under 10 wells1

What a well costs in Comfort

At the median depth for Comfort (390 feet), a complete home well would cost roughly $12,500 to $30,000: $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 (358 to 440 feet) the range runs from $11,500 to $33,000. 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 Comfort, Texas?

Home water wells in and around Comfort, Texas are typically 358 to 440 feet deep (median 390 ft, 65 wells drilled in the last 10 years). One in ten goes past 524 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 Comfort draw from?

Most draw from the Middle Trinity (55%), and 45% draw from the Lower Trinity, 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 Comfort?

At the median depth (390 feet), a complete well would cost roughly $12,500 to $30,000, 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 Comfort?

When the wells were finished, the water stood a median 196 feet below the surface (46 wells). The level moves with drought and from one well to the next.

Do I need a permit to drill a well in Comfort?

Comfort is inside the Cow Creek 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.

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

Sources