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How deep are water wells in Mullin, Texas?

Only 27 home water wells in and around Mullin, Texas have been reported since 2001, so treat this as a rough guide: the middle half are 165 to 238 feet deep (median 185 ft). Nearly all draw from the lower Trinity (Twin Mountains and Travis Peak, 96%), according to the state's Northern Trinity and Woodbine model (TWDB). Estimated cost of a complete well at the median depth: $7,000 to $17,500.

This page is based on fewer than 30 wells, so it is kept out of search engines until more reports come in. Treat every figure as a rough guide.

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 pointMills County
What is under Mullin, TexasUnderground column at the center of Mullin: median well 185 ft, middle half 165 to 238 ft, water at 50 ft, and the layers of the state's model with their thickness.Lower Trinity: 0 to 217 ftLower TrinityBelow the base of the Trinity0100200300400ftGround level · 1,451 ft above sea levelMedian well: 185 ftWater standing in the well from 50 ftWater level50 ftMiddle half165–238 ftMedian well185 ft

Under Mullin, Mills County

Layers at the center of Mullin from TWDB's Northern Trinity and Woodbine model (quarter mile cells, summarized here to about 1.3 miles), at true depth scale. The well and the water are the median of 27 real wells.

Home wells in and around Mullin

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: Mullin and about 2 miles around it

Key figures

Typical depth (middle half)
165 to 238 feet
Median depth
185 feet
Deepest 10% are past
289 feet
Water level (median)
50 feet
21 wells
Yield (median)
15 gpm
23 wells, gallons per minute
Wells used
27
Since 2001
Inside the city limits
6
the rest within 2 miles
All years on file
27
median 185 ft, since 2004
Confidence
Few wells (10 to 29)

When the wells were finished, the water stood a median 50 feet below the surface (21 wells), well above the bottom: the typical well holds about 135 feet of water.

What is under Mullin, TexasUnderground column at the center of Mullin: median well 185 ft, middle half 165 to 238 ft, water at 50 ft, and the layers of the state's model with their thickness.Lower Trinity: 0 to 217 ftLower TrinityBelow the base of the Trinity0100200300400ftGround level · 1,451 ft above sea levelMedian well: 185 ftWater standing in the well from 50 ftWater level50 ftMiddle half165–238 ftMedian well185 ft
Layers at the center of Mullin from TWDB's Northern Trinity and Woodbine model (quarter mile cells, summarized here to about 1.3 miles), at true depth scale. The well and the water are the median of 27 real wells.

Which formation do wells in Mullin draw from?

Nearly all draw from the lower Trinity (Twin Mountains and Travis Peak, 96%), according to the state's Northern Trinity and Woodbine model (TWDB).

Only 78% bottom out inside the lower Trinity (Twin Mountains and Travis Peak): the rest keep going deeper but take their water from that layer. 22% 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)
Lower TrinityTwin Mountains and Travis Peak96%26162–240
Near or below the base of the Trinity4%1—

For 70% 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.

The layers under the center of Mullin

From the state's model, at 1,451 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)
Lower Trinitysandstone with shale and limestone0217217

Depth over time

Too few wells per period in and around Mullin to compare depth over time. Since 2004, 27 home wells have been reported, with a median of 185 feet.

PeriodMedian depth (ft)Wells
2001–2005under 10 wells4
2006–2010under 10 wells4
2016–2020under 10 wells2
2021–202523514
2026under 10 wells3

What a well costs in Mullin

At the median depth for Mullin (185 feet), a complete home well would cost roughly $7,000 to $17,500: $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 (165 to 238 feet) the range runs from $6,500 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.

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 Mullin, Texas?

Only 27 home water wells in and around Mullin, Texas have been reported since 2001, so treat this as a rough guide: the middle half are 165 to 238 feet deep (median 185 ft). One in ten goes past 289 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 Mullin draw from?

Nearly all draw from the lower Trinity (Twin Mountains and Travis Peak, 96%), according to the state's Northern Trinity and Woodbine 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 Mullin?

At the median depth (185 feet), a complete well would cost roughly $7,000 to $17,500, 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 Mullin?

When the wells were finished, the water stood a median 50 feet below the surface (21 wells), well above the bottom: the typical well holds about 135 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 Mullin?

In the state's boundary file (current as of November 2019) no groundwater conservation district covers Mullin. Districts created or enlarged since then are missing from that file, so confirm with the county or TWDB before drilling. Anywhere in Texas the well must be drilled by a licensed driller, who files the report with the state.

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 70% 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 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/places/mullin-tx. License CC BY 4.0. https://doi.org/10.5281/zenodo.24126380.

Sources