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Water wells in the Edwards Group, Gillespie County, Texas

Home water wells that draw from the Edwards Group in Gillespie County, Texas are typically 180 to 240 feet deep (median 200 ft, 177 wells drilled in the last 10 years). It accounts for 13% of the 1,335 county wells the state's model covers; the main layer is the Middle Trinity (51%). They run about 40 feet shallower than the county's median well (240 ft). Estimated cost of a complete well at the median depth: $7,500 to $18,500.

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 Gillespie CountyEdwards Group across Texas

Which layer Gillespie County wells draw from

Under Harper, Gillespie County

County home wells covered by the Hill Country Trinity model (in the last 10 years).

Home wells in Gillespie 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: Gillespie County

Key figures

Typical depth (middle half)
180 to 240 feet
Median depth
200 feet
Deepest 10% are past
265 feet
Water level (median)
92 feet
160 wells
Yield (median)
15 gpm
158 wells, gallons per minute
Wells used
177
In the last 10 years
Share of the county's wells
13%
All years on file
279
median 200 ft, since 2001
Confidence
Standard (30 or more wells)

When the wells were finished, the water stood a median 92 feet below the surface (160 wells).

Which layer Gillespie County wells draw from

County home wells covered by the Hill Country Trinity model (in the last 10 years).

What this layer is

The Edwards Group is the limestone that caps the high ground of the Hill Country, on top of the Trinity. In the state's model it is the first layer, present on the plateau and missing in the valleys, where streams have cut down into the Trinity. Home wells that stop in it are the shallowest of the four layers.

Checked against the state's own aquifer codes: where our method names this layer, the state agrees in 100% of 156 wells.

More about the Edwards Group

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 Gillespie County are getting deeper. For reference, the median was 180 feet in 2001 to 2005 (25 wells) and 203 feet in 2026 (10 wells).

PeriodMedian depth (ft)Wells
2001–200518025
2006–201016027
2011–201520029
2016–202020091
2021–202520597
202620310

Places in Gillespie County with wells in this layer

Common questions

How deep is a well in the Edwards Group in Gillespie County?

Home water wells that draw from the Edwards Group in Gillespie County, Texas are typically 180 to 240 feet deep (median 200 ft, 177 wells drilled in the last 10 years).

How many Gillespie County wells draw from this layer?

It accounts for 13% of the 1,335 county wells the state's model covers; the main layer is the Middle Trinity (51%). For 97% 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 deep does the water stand?

When the wells were finished, the water stood a median 92 feet below the surface (160 wells).

What a well costs here

At the median depth for this layer in Gillespie County (200 feet), a complete home well would cost roughly $7,500 to $18,500: $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 (180 to 240 feet) the range runs from $7,000 to $21,000. 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.

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.

For 97% 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/gillespie-county/edwards-group. License CC BY 4.0. https://doi.org/10.5281/zenodo.24126380.

Sources