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Water wells in the Washita and Fredericksburg groups, Travis County, Texas

Home water wells that draw from the Washita and Fredericksburg groups in Travis County, Texas are typically 325 to 500 feet deep (median 410 ft, 58 wells reported since 2001). It is a minor layer here: just 1% of the 916 wells the state's model covers; the main one is the Lower Trinity (46%). They are about as deep as the county's median well (445 ft). Estimated cost of a complete well at the median depth: $13,000 to $31,000.

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

All wells in Travis CountyWashita and Fredericksburg across Texas

Which layer Travis County wells draw from

Under Austin, Travis County

County home wells covered by the Northern Trinity and Woodbine model (in the last 10 years).

Home wells in Travis County

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+

Dark line: Travis County

Key figures

Typical depth (middle half)
325 to 500 feet
Median depth
410 feet
Deepest 10% are past
565 feet
Water level (median)
132 feet
38 wells
Yield (median)
40 gpm
51 wells, gallons per minute
Wells used
58
Since 2001
Share of the county's wells
1%
All years on file
58
median 410 ft, since 2002
Confidence
Standard (30 or more wells)

When the wells were finished, the water stood a median 132 feet below the surface (38 wells), well above the bottom: the typical well holds about 278 feet of water.

Which layer Travis County wells draw from

County home wells covered by the Northern Trinity and Woodbine model (in the last 10 years).

What this layer is

The Washita and Fredericksburg groups are limestone, marl and clay between the Woodbine and the Trinity (Georgetown, Duck Creek, Kiamichi, Edwards, Comanche Peak and Walnut, among others). In Williamson, Bell and Travis counties the model's layer includes part of the Edwards limestone of the Balcones Fault Zone, but this page describes the model layer as a whole, not that aquifer.

More about the Washita and Fredericksburg groups

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 this layer in Travis County are getting deeper. For reference, the median was 395 feet in 2006 to 2010 (22 wells) and 400 feet in 2011 to 2015 (15 wells).

PeriodMedian depth (ft)Wells
2001–2005under 10 wells8
2006–201039522
2011–201540015
2016–2020under 10 wells8
2021–2025under 10 wells2
2026under 10 wells3

Places in Travis County with wells in this layer

Common questions

How deep is a well in the Washita and Fredericksburg groups in Travis County?

Home water wells that draw from the Washita and Fredericksburg groups in Travis County, Texas are typically 325 to 500 feet deep (median 410 ft, 58 wells reported since 2001).

How many Travis County wells draw from this layer?

It is a minor layer here: just 1% of the 916 wells the state's model covers; the main one is the Lower Trinity (46%). Only 22% 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 deep does the water stand?

When the wells were finished, the water stood a median 132 feet below the surface (38 wells), well above the bottom: the typical well holds about 278 feet of water.

What a well costs here

At the median depth for this layer in Travis County (410 feet), a complete home well would cost roughly $13,000 to $31,000: $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 (325 to 500 feet) the range runs from $10,500 to $36,500. 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.

How these numbers are made

We count new and replacement domestic (home) wells with a valid depth on their report. 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 22% 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 7,977 wells in the area of the state's Northern Trinity and Woodbine model (North and Central Texas) 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 74% of them, and that layer or the one next to it in at least 95%; among the 3,130 of those wells that the state places in a Trinity layer (Paluxy to Hosston) it is about 56%.

  • The layers come from the Texas Water Development Board's Northern Trinity and Woodbine model, with quarter mile cells, summarized here to about 1.3 miles. 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.
  • In this model every layer is at least 30 feet thick, even where the real rock is thinner or missing. Thin layers and the edges of the model are approximate.
  • Inside the Trinity this atlas does not name single model layers: it groups the Paluxy and Glen Rose (upper Trinity) and groups the Hensell, Pearsall and Hosston (lower Trinity, Twin Mountains and Travis Peak), because the check against the state's codes shows the method cannot separate them reliably.
  • "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/travis-county/washita-fredericksburg. License CC BY 4.0. https://doi.org/10.5281/zenodo.24126380.

Sources