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How deep are water wells in Jarrell, Texas?

Home water wells in and around Jarrell, Texas vary a lot in depth: the middle half are 310 to 860 feet deep (median 440 ft, 41 wells drilled in the last 10 years), so look at the wells closest to the tract. Most draw from the Washita and Fredericksburg groups (73%), and 24% draw from the upper Trinity (Paluxy and Glen Rose), according to the state's Northern Trinity and Woodbine model (TWDB). Estimated cost of a complete well at the median depth: $13,500 to $33,000.

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 pointWilliamson County
What is under Jarrell, TexasUnderground column at the center of Jarrell: median well 440 ft, middle half 310 to 860 ft, water at 260 ft, and the layers of the state's model with their thickness.Above the Woodbine: 0 to 156 ftAbove the WoodbineWoodbine: 156 to 180 ftWashita and Fredericksburg: 180 to 673 ftWashita and Frederick…Upper Trinity: 673 to 1,345 ftUpper Trinitycontinues to 1,707 ft02505007501,0001,250ftGround level · 875 ft above sea levelMedian well: 440 ftWater standing in the well from 260 ftWater level260 ftMedian well440 ftMiddle half310–860 ft

Under Jarrell, Williamson County

Layers at the center of Jarrell 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 41 real wells.

Home wells in and around Jarrell

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: Jarrell and about 2 miles around it

Key figures

Typical depth (middle half)
310 to 860 feet
Median depth
440 feet
Deepest 10% are past
900 feet
Water level (median)
260 feet
34 wells
Yield (median)
50 gpm
25 wells, gallons per minute
Wells used
41
In the last 10 years
Inside the city limits
11
the rest within 2 miles
All years on file
161
median 460 ft, since 2002
Confidence
Standard (30 or more wells)

When the wells were finished, the water stood a median 260 feet below the surface (34 wells).

What is under Jarrell, TexasUnderground column at the center of Jarrell: median well 440 ft, middle half 310 to 860 ft, water at 260 ft, and the layers of the state's model with their thickness.Above the Woodbine: 0 to 156 ftAbove the WoodbineWoodbine: 156 to 180 ftWashita and Fredericksburg: 180 to 673 ftWashita and Frederick…Upper Trinity: 673 to 1,345 ftUpper Trinitycontinues to 1,707 ft02505007501,0001,250ftGround level · 875 ft above sea levelMedian well: 440 ftWater standing in the well from 260 ftWater level260 ftMedian well440 ftMiddle half310–860 ft
Layers at the center of Jarrell 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 41 real wells.

Which formation do wells in Jarrell draw from?

Most draw from the Washita and Fredericksburg groups (73%), and 24% draw from the upper Trinity (Paluxy and Glen Rose), according to the state's Northern Trinity and Woodbine model (TWDB).

Layer (state's model)ShareWellsTypical depth (ft)
Washita and Fredericksburg73%30240–450
Upper TrinityPaluxy and Glen Rose24%10874–926
Lower TrinityTwin Mountains and Travis Peak2%1—

For 73% 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 Jarrell

From the state's model, at 875 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)
Above the Woodbineshale, chalk and marl0156156
Woodbinesandstone with shale15618024
Washita and Fredericksburglimestone, marl and clay180673493
Upper Trinitysandstone, limestone and marl6731,345672
Lower Trinitysandstone with shale and limestone1,3451,707362

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 Jarrell are getting deeper. For reference, the median was 440 feet in 2001 to 2005 (39 wells) and 450 feet in 2021 to 2025 (19 wells).

PeriodMedian depth (ft)Wells
2001–200544039
2006–201046042
2011–201546034
2016–202044025
2021–202545019
2026under 10 wells2

What a well costs in Jarrell

At the median depth for Jarrell (440 feet), a complete home well would cost roughly $13,500 to $33,000: $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 (310 to 860 feet) the range runs from $10,500 to $58,000. 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 Jarrell, Texas?

Home water wells in and around Jarrell, Texas vary a lot in depth: the middle half are 310 to 860 feet deep (median 440 ft, 41 wells drilled in the last 10 years), so look at the wells closest to the tract. One in ten goes past 900 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 Jarrell draw from?

Most draw from the Washita and Fredericksburg groups (73%), and 24% draw from the upper Trinity (Paluxy and Glen Rose), 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 Jarrell?

At the median depth (440 feet), a complete well would cost roughly $13,500 to $33,000, 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 Jarrell?

When the wells were finished, the water stood a median 260 feet below the surface (34 wells). The level moves with drought and from one well to the next.

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

In the state's boundary file (current as of November 2019) no groundwater conservation district covers Jarrell. 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 73% 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/jarrell-tx. License CC BY 4.0. https://doi.org/10.5281/zenodo.24126380.

Sources