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How deep are water wells in Fredericksburg, Texas?

Home water wells in and around Fredericksburg, Texas are typically 138 to 235 feet deep (median 177 ft, 233 wells drilled in the last 10 years). Most draw from the Middle Trinity (60%), and 40% end near or below the base of the Trinity, according to the state's Hill Country Trinity model (TWDB). New wells run about 13% deeper than 20 years ago (median 160 ft in 2003 to 2007, 180 ft in 2021 to 2025). Estimated cost of a complete well at the median depth: $7,000 to $17,000.

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 pointGillespie County
What is under Fredericksburg, TexasUnderground column at the center of Fredericksburg: median well 177 ft, middle half 138 to 235 ft, water at 60 ft, and the layers of the state's model with their thickness.Middle Trinity: 0 to 162 ftMiddle TrinityBelow the base of the Trinity0100200300400ftGround level · 1,710 ft above sea levelMedian well: 177 ftWater standing in the well from 60 ftWater level60 ftMiddle half138–235 ftMedian well177 ft

Under Fredericksburg, Gillespie County

Layers at the center of Fredericksburg from TWDB's Hill Country Trinity model (1 mile cells), at true depth scale. The well and the water are the median of 233 real wells.

Home wells in and around Fredericksburg

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: Fredericksburg and about 2 miles around it

Key figures

Typical depth (middle half)
138 to 235 feet
Median depth
177 feet
Deepest 10% are past
340 feet
Water level (median)
60 feet
170 wells
Yield (median)
20 gpm
203 wells, gallons per minute
Wells used
233
In the last 10 years
Inside the city limits
11
the rest within 2 miles
All years on file
545
median 170 ft, since 2001
Confidence
Standard (30 or more wells)

When the wells were finished, the water stood a median 60 feet below the surface (170 wells), well above the bottom: the typical well holds about 117 feet of water.

What is under Fredericksburg, TexasUnderground column at the center of Fredericksburg: median well 177 ft, middle half 138 to 235 ft, water at 60 ft, and the layers of the state's model with their thickness.Middle Trinity: 0 to 162 ftMiddle TrinityBelow the base of the Trinity0100200300400ftGround level · 1,710 ft above sea levelMedian well: 177 ftWater standing in the well from 60 ftWater level60 ftMiddle half138–235 ftMedian well177 ft
Layers at the center of Fredericksburg from TWDB's Hill Country Trinity model (1 mile cells), at true depth scale. The well and the water are the median of 233 real wells.

Which formation do wells in Fredericksburg draw from?

Most draw from the Middle Trinity (60%), and 40% end near or below the base of the Trinity, according to the state's Hill Country Trinity model (TWDB).

Only 32% bottom out inside the Middle Trinity: the rest keep going deeper but take their water from that layer. 68% 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)
Middle Trinity60%133133–200
Near or below the base of the Trinity40%90141–280

For 90% 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 Fredericksburg

From the state's model, at 1,710 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)
Middle Trinitylimestone and sand0162162

Depth over time

New home wells in and around Fredericksburg are deeper than 20 years ago: the median went from 160 feet (2003 to 2007) to 180 feet (2021 to 2025), 13% 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
2001–2005161143
2006–201016083
2011–201517970
2016–2020160105
2021–2025180134
202615510

What a well costs in Fredericksburg

At the median depth for Fredericksburg (177 feet), a complete home well would cost roughly $7,000 to $17,000: $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 (138 to 235 feet) the range runs from $6,000 to $20,500. 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 Fredericksburg, Texas?

Home water wells in and around Fredericksburg, Texas are typically 138 to 235 feet deep (median 177 ft, 233 wells drilled in the last 10 years). One in ten goes past 340 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 Fredericksburg draw from?

Most draw from the Middle Trinity (60%), and 40% end near or below the base of the 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 Fredericksburg?

At the median depth (177 feet), a complete well would cost roughly $7,000 to $17,000, 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 Fredericksburg?

When the wells were finished, the water stood a median 60 feet below the surface (170 wells), well above the bottom: the typical well holds about 117 feet of water. The level moves with drought and from one well to the next.

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

Fredericksburg is inside the Hill Country Underground Water 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 90% 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/fredericksburg-tx. License CC BY 4.0. https://doi.org/10.5281/zenodo.24126380.

Sources