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How deep are water wells in Millsap, Texas?

Home water wells in and around Millsap, Texas are typically 200 to 340 feet deep (median 240 ft, 41 wells drilled in the last 10 years). The state's model covers only 37% of these wells (15); among those, 80% end near or below the base of the Trinity, and 20% draw from the lower Trinity (Twin Mountains and Travis Peak), according to the state's Northern Trinity and Woodbine model (TWDB). Estimated cost of a complete well at the median depth: $8,500 to $21,000.

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 pointParker County
What is under Millsap, TexasUnderground column at the center of Millsap: median well 240 ft, middle half 200 to 340 ft.No state layer model here yet0100200300400500ftGround levelMedian well: 240 ftMiddle half200–340 ftMedian well240 ft

Under Millsap, Parker County

The well and the water are the median of 41 real wells. This atlas does not have a state layer model for this area yet.

Home wells in and around Millsap

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: Millsap and about 2 miles around it

Key figures

Typical depth (middle half)
200 to 340 feet
Median depth
240 feet
Deepest 10% are past
380 feet
Yield (median)
5 gpm
23 wells, gallons per minute
Wells used
41
In the last 10 years
Inside the city limits
1
the rest within 2 miles
All years on file
62
median 200 ft, since 2003
Confidence
Standard (30 or more wells)
What is under Millsap, TexasUnderground column at the center of Millsap: median well 240 ft, middle half 200 to 340 ft.No state layer model here yet0100200300400500ftGround levelMedian well: 240 ftMiddle half200–340 ftMedian well240 ft
The well and the water are the median of 41 real wells. This atlas does not have a state layer model for this area yet.

Which formation do wells in Millsap draw from?

The state's model covers only 37% of these wells (15); among those, 80% end near or below the base of the Trinity, and 20% draw from the lower Trinity (Twin Mountains and Travis Peak), according to the state's Northern Trinity and Woodbine model (TWDB).

87% 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)
Near or below the base of the Trinity80%12210–345
Lower TrinityTwin Mountains and Travis Peak20%3—

For 67% 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.

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 and around Millsap are getting deeper. For reference, the median was 150 feet in 2006 to 2010 (12 wells) and 260 feet in 2021 to 2025 (31 wells).

PeriodMedian depth (ft)Wells
2001–2005under 10 wells4
2006–201015012
2011–2015under 10 wells5
2016–2020under 10 wells8
2021–202526031
2026under 10 wells2

What a well costs in Millsap

At the median depth for Millsap (240 feet), a complete home well would cost roughly $8,500 to $21,000: $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 (200 to 340 feet) the range runs from $7,500 to $27,000. 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 Millsap, Texas?

Home water wells in and around Millsap, Texas are typically 200 to 340 feet deep (median 240 ft, 41 wells drilled in the last 10 years). One in ten goes past 380 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 Millsap draw from?

The state's model covers only 37% of these wells (15); among those, 80% end near or below the base of the Trinity, and 20% draw from the lower Trinity (Twin Mountains and Travis Peak), 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 Millsap?

At the median depth (240 feet), a complete well would cost roughly $8,500 to $21,000, by TerraFunded's estimate from published Texas driller prices. The real price comes from a licensed driller's quote.

Do I need a permit to drill a well in Millsap?

Millsap is inside the Upper 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.

For 67% 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.
  • In this area, north and west of Fort Worth, the state maps the Trinity as one undivided unit, the Antlers Formation. The model cuts it into layers by depth; the split between upper and lower Trinity shown here is approximate, and the depth ranges are the solid part.
  • "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/millsap-tx. License CC BY 4.0. https://doi.org/10.5281/zenodo.24126380.

Sources