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Water wells in the Ogallala Aquifer, Armstrong County, Texas

Home water wells that draw from the Ogallala Aquifer in Armstrong County, Texas are typically 225 to 288 feet deep (median 265 ft, 49 wells drilled in the last 10 years). It is the county's main layer: 50% of the 98 wells the state's model covers. They are about as deep as the county's median well (270 ft). Estimated cost of a complete well at the median depth: $9,000 to $22,500.

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 Armstrong CountyOgallala Aquifer across Texas

Which layer Armstrong County wells draw from

Under Claude, Armstrong County

County home wells covered by the High Plains Aquifer System model (in the last 10 years).

Home wells in Armstrong 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: Armstrong County

Key figures

Typical depth (middle half)
225 to 288 feet
Median depth
265 feet
Deepest 10% are past
316 feet
Water level (median)
180 feet
40 wells
Yield (median)
17.5 gpm
21 wells, gallons per minute
Wells used
49
In the last 10 years
Share of the county's wells
50%
All years on file
65
median 257 ft, since 2003
Confidence
Standard (30 or more wells)

When the wells were finished, the water stood a median 180 feet below the surface (40 wells).

Which layer Armstrong County wells draw from

County home wells covered by the High Plains Aquifer System model (in the last 10 years).

What this layer is

The Ogallala is sand, gravel, silt and caliche that rivers spread east from the Rocky Mountains millions of years ago. It lies under almost all of the Texas Panhandle and the South Plains and is the main source of water there, for farms, towns and homes alike. Most home wells from Dallam County to Gaines County draw from it.

Checked against the state's own aquifer codes: where our method names this group, the state agrees in 98% of 11,766 wells.

More about the Ogallala Aquifer

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 Armstrong County are getting deeper. For reference, the median was 280 feet in 2016 to 2020 (25 wells) and 260 feet in 2021 to 2025 (23 wells).

PeriodMedian depth (ft)Wells
2001–2005under 10 wells3
2006–2010under 10 wells5
2011–2015under 10 wells7
2016–202028025
2021–202526023
2026under 10 wells2

Places in Armstrong County with wells in this layer

Common questions

How deep is a well in the Ogallala Aquifer in Armstrong County?

Home water wells that draw from the Ogallala Aquifer in Armstrong County, Texas are typically 225 to 288 feet deep (median 265 ft, 49 wells drilled in the last 10 years).

How many Armstrong County wells draw from this layer?

It is the county's main layer: 50% of the 98 wells the state's model covers. For 100% 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 180 feet below the surface (40 wells).

What a well costs here

At the median depth for this layer in Armstrong County (265 feet), a complete home well would cost roughly $9,000 to $22,500: $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 (225 to 288 feet) the range runs from $8,000 to $24,000. 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 100% 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 22,814 wells in the Texas part of the state's High Plains Aquifer System model (the Panhandle, the South Plains and the Permian Basin) where the State of Texas recorded the aquifer, the formation our method says the well draws from (as grouped on these pages) is the one the state recorded in about 75% of them; when it names the Dockum (4,542 wells), the state's record agrees only about 33% of the time, and most of the others are recorded as Ogallala wells.

  • The layers come from the Texas Water Development Board's High Plains Aquifer System model, with half mile cells, read here on a grid of about 1.2 by 1.4 miles. It is a regional model, not a survey of any lot.
  • The state's model has half mile cells; we read it on a grid of about 1.2 by 1.4 miles, Texas part only. Layers from version 1.01 (2015); the 2025 extension (1.02) did not change them. It is not a survey of any lot, so we give ranges.
  • Figures go by four groups: Ogallala; Pecos Valley; Edwards-Trinity and Rita Blanca (Cretaceous rock under the Ogallala; the Rita Blanca alone matched the state 19%); Dockum (upper and lower together: the state's codes almost never say which). The Edwards-Trinity group joins three aquifers in different places (High Plains around Lubbock, Plateau around Midland and Odessa, Rita Blanca in Dallam and Hartley): county and place pages name the local one where they can.
  • Dockum: when our method names the Dockum, the state's record agrees only 33% of the time over all years (61% for wells with a screened interval, which is 93% of home wells of the last 10 years); most of the rest are recorded as Ogallala wells. The median well we put in the Dockum ends about 18 ft under the base of the Ogallala as the model draws it. So these pages say "at or just below the base of the Ogallala, in the top of the Dockum", never a certain formation. The state's own 2025 report on this model says depth alone overstates the upper Dockum.
  • "Near or below the base" means the well ends near or below the base of the Dockum, or of the Ogallala where there is no Dockum (Permian red beds; Gray, Carson, Donley, Moore and north Potter counties). Half of these wells end within about 51 ft of the base, and the state usually records them as Ogallala or Dockum wells. That is not an error: the model simply ends there.
  • For old wells without a screened interval (bottom of the hole) the method is only a little better than always saying Ogallala (65% against 58%); with an interval it is 89% against 80%. Figures over all years carry that weakness; last 10 years figures rest almost entirely on intervals.
  • 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/armstrong-county/ogallala. License CC BY 4.0. https://doi.org/10.5281/zenodo.24126380.

Sources