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How deep are water wells in Valley Mills, Texas?

Only 11 home water wells in and around Valley Mills, Texas have been reported since 2001, so treat this as a rough guide: the middle half are 985 to 1,160 feet deep (median 1,102 ft). Most are completed in the lower Trinity (Twin Mountains and Travis Peak, 73%), and 27% end near or below the base of the Trinity, according to the state's Northern Trinity and Woodbine model (TWDB). Estimated cost of a complete well at the median depth: $30,000 to $72,500.

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 pointBosque County
What is under Valley Mills, TexasUnderground column at the center of Valley Mills: median well 1,102 ft, middle half 985 to 1,160 ft, water at 588 ft, and the layers of the state's model with their thickness.Washita and Fredericksburg: 0 to 364 ftWashita and Frederick…Upper Trinity: 364 to 907 ftUpper TrinityLower Trinity: 907 to 1,146 ftLower TrinityBelow the base of the Trinity05001,0001,500ftGround level · 704 ft above sea levelMedian well: 1,102 ftWater standing in the well from 588 ftWater level588 ftMiddle half985–1,160 ftMedian well1,102 ft

Under Valley Mills, Bosque County

Layers at the center of Valley Mills 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 11 real wells.

Home wells in and around Valley Mills

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: Valley Mills and about 2 miles around it

Key figures

Typical depth (middle half)
985 to 1,160 feet
Median depth
1,102 feet
Deepest 10% are past
1,192 feet
Water level (median)
588 feet
11 wells
Yield (median)
30 gpm
11 wells, gallons per minute
Wells used
11
Since 2001
Inside the city limits
0
the rest within 2 miles
All years on file
11
median 1,102 ft, since 2007
Confidence
Few wells (10 to 29)

When the wells were finished, the water stood a median 588 feet below the surface (11 wells).

What is under Valley Mills, TexasUnderground column at the center of Valley Mills: median well 1,102 ft, middle half 985 to 1,160 ft, water at 588 ft, and the layers of the state's model with their thickness.Washita and Fredericksburg: 0 to 364 ftWashita and Frederick…Upper Trinity: 364 to 907 ftUpper TrinityLower Trinity: 907 to 1,146 ftLower TrinityBelow the base of the Trinity05001,0001,500ftGround level · 704 ft above sea levelMedian well: 1,102 ftWater standing in the well from 588 ftWater level588 ftMiddle half985–1,160 ftMedian well1,102 ft
Layers at the center of Valley Mills 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 11 real wells.

Which formation do wells in Valley Mills draw from?

Most are completed in the lower Trinity (Twin Mountains and Travis Peak, 73%), and 27% end near or below the base of the Trinity, according to the state's Northern Trinity and Woodbine model (TWDB).

Only 36% bottom out inside the lower Trinity (Twin Mountains and Travis Peak): the rest keep going deeper but take their water from that layer. 64% 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 Peak73%8970–1,184
Near or below the base of the Trinity27%3—

Only 55% 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.

The layers under the center of Valley Mills

From the state's model, at 704 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)
Washita and Fredericksburglimestone, marl and clay0364364
Upper Trinitysandstone, limestone and marl364907543
Lower Trinitysandstone with shale and limestone9071,146239

Depth over time

Too few wells per period in and around Valley Mills to compare depth over time. Since 2007, 11 home wells have been reported, with a median of 1,102 feet.

PeriodMedian depth (ft)Wells
2006–2010under 10 wells4
2011–2015under 10 wells1
2016–2020under 10 wells3
2021–2025under 10 wells3

What a well costs in Valley Mills

At the median depth for Valley Mills (1,102 feet), a complete home well would cost roughly $30,000 to $72,500: $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 (985 to 1,160 feet) the range runs from $27,000 to $76,000. 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 Valley Mills, Texas?

Only 11 home water wells in and around Valley Mills, Texas have been reported since 2001, so treat this as a rough guide: the middle half are 985 to 1,160 feet deep (median 1,102 ft). One in ten goes past 1,192 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 Valley Mills draw from?

Most are completed in the lower Trinity (Twin Mountains and Travis Peak, 73%), and 27% end near or below the base of the Trinity, 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 Valley Mills?

At the median depth (1,102 feet), a complete well would cost roughly $30,000 to $72,500, 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 Valley Mills?

When the wells were finished, the water stood a median 588 feet below the surface (11 wells). The level moves with drought and from one well to the next.

Do I need a permit to drill a well in Valley Mills?

Valley Mills is inside the Middle Trinity Groundwater Conservation District. Groundwater conservation districts in Texas can require registering or permitting a new well, keeping set distances from property lines and other wells, and paying fees. Rules differ from district to district: ask the district before drilling.

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.

Only 55% 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/places/valley-mills-tx. License CC BY 4.0. https://doi.org/10.5281/zenodo.24126380.

Sources