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Water wells in the Edwards-Trinity (Plateau) Aquifer, Midland County, Texas

Home water wells that draw from the Edwards-Trinity (Plateau) Aquifer in Midland County, Texas are typically 90 to 125 feet deep (median 100 ft, 1,299 wells drilled in the last 10 years). It accounts for 40% of the 3,246 county wells the state's model covers; the main layer is the Ogallala Aquifer (59%). They are about as deep as the county's median well (100 ft). Estimated cost of a complete well at the median depth: $5,000 to $12,500.

Checked against the state's own aquifer codes: where our method names this group, the state agrees in 70% of 4,432 wells (64% for the 571 with a screened interval on their report). Read it as the likely group, not a certain one.

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 Midland CountyEdwards-Trinity (Plateau) Aquifer across Texas

Which layer Midland County wells draw from

Under Midland, Midland County

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

Home wells in Midland 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: Midland County

Key figures

Typical depth (middle half)
90 to 125 feet
Median depth
100 feet
Deepest 10% are past
150 feet
Water level (median)
60 feet
119 wells
Yield (median)
20 gpm
434 wells, gallons per minute
Wells used
1,299
In the last 10 years
Share of the county's wells
40%
All years on file
3,728
median 115 ft, since 2001
Confidence
Standard (30 or more wells)

When the wells were finished, the water stood a median 60 feet below the surface (119 wells).

Which layer Midland County wells draw from

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

What this layer is

Under the Ogallala, in many places, lie Cretaceous rocks: the Antlers (Trinity) sand and the Edwards limestones. They form the Edwards-Trinity (High Plains) Aquifer around and south of Lubbock and the Edwards-Trinity (Plateau) Aquifer around Midland and Odessa, and older Cretaceous and Jurassic sandstones form the Rita Blanca Aquifer in Dallam and Hartley counties. Many home wells in Midland, Martin, Terry, Lynn and Hockley counties draw from them.

More about the Edwards-Trinity (Plateau) Aquifer

Depth over time

New home wells in this layer in Midland County are shallower than 20 years ago: the median went from 120 feet (2003 to 2007) to 100 feet (2021 to 2025), 17% less. That usually happens when new homes go up in a different area or drillers switch layers.

PeriodMedian depth (ft)Wells
2001–2005121349
2006–2010120556
2011–20151201,478
2016–202098722
2021–2025100523
2026100100

Places in Midland County with wells in this layer

Common questions

How deep is a well in the Edwards-Trinity (Plateau) Aquifer in Midland County?

Home water wells that draw from the Edwards-Trinity (Plateau) Aquifer in Midland County, Texas are typically 90 to 125 feet deep (median 100 ft, 1,299 wells drilled in the last 10 years).

How many Midland County wells draw from this layer?

It accounts for 40% of the 3,246 county wells the state's model covers; the main layer is the Ogallala Aquifer (59%). For 68% of these wells the report says where the water enters and we use the middle of that interval; for the rest we use the bottom of the hole, which tends to read one layer too deep.

How deep does the water stand?

When the wells were finished, the water stood a median 60 feet below the surface (119 wells).

What a well costs here

At the median depth for this layer in Midland County (100 feet), a complete home well would cost roughly $5,000 to $12,500: $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 (90 to 125 feet) the range runs from $5,000 to $14,000. 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 68% of these wells the report says where the water enters and we use the middle of that interval; for the rest we use the bottom of the hole, which tends to read one layer too deep.

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/midland-county/edwards-trinity. License CC BY 4.0. https://doi.org/10.5281/zenodo.24126380.

Sources