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How deep are water wells in Johnson City, Texas?

Home water wells in and around Johnson City, Texas are typically 285 to 445 feet deep (median 385 ft, 125 wells drilled in the last 10 years). Nearly all end near or below the base of the Trinity (91%), according to the state's Hill Country Trinity model (TWDB). New wells run about 32% deeper than 20 years ago (median 304 ft in 2003 to 2007, 400 ft in 2021 to 2025). Estimated cost of a complete well at the median depth: $12,000 to $29,500.

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 pointBlanco County
What is under Johnson City, TexasUnderground column at the center of Johnson City: median well 385 ft, middle half 285 to 445 ft, water at 79 ft, and the layers of the state's model with their thickness.Upper Trinity: 0 to 11 ftMiddle Trinity: 11 to 52 ftMiddle TrinityBelow the base of the Trinity0200400600ftGround level · 1,213 ft above sea levelMedian well: 385 ftWater standing in the well from 79 ftWater level79 ftMiddle half285–445 ftMedian well385 ft

Under Johnson City, Blanco County

Layers at the center of Johnson City from TWDB's Hill Country Trinity model (1 mile cells), at true depth scale. The well and the water are the median of 125 real wells.

Home wells in and around Johnson City

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: Johnson City and about 2 miles around it

Key figures

Typical depth (middle half)
285 to 445 feet
Median depth
385 feet
Deepest 10% are past
508 feet
Water level (median)
79 feet
82 wells
Yield (median)
30 gpm
112 wells, gallons per minute
Wells used
125
In the last 10 years
Inside the city limits
4
the rest within 2 miles
All years on file
225
median 364 ft, since 1982
Confidence
Standard (30 or more wells)

When the wells were finished, the water stood a median 79 feet below the surface (82 wells), well above the bottom: the typical well holds about 306 feet of water.

What is under Johnson City, TexasUnderground column at the center of Johnson City: median well 385 ft, middle half 285 to 445 ft, water at 79 ft, and the layers of the state's model with their thickness.Upper Trinity: 0 to 11 ftMiddle Trinity: 11 to 52 ftMiddle TrinityBelow the base of the Trinity0200400600ftGround level · 1,213 ft above sea levelMedian well: 385 ftWater standing in the well from 79 ftWater level79 ftMiddle half285–445 ftMedian well385 ft
Layers at the center of Johnson City from TWDB's Hill Country Trinity model (1 mile cells), at true depth scale. The well and the water are the median of 125 real wells.

Which formation do wells in Johnson City draw from?

Nearly all end near or below the base of the Trinity (91%), according to the state's Hill Country Trinity model (TWDB).

97% 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 Trinity91%81285–440
Middle Trinity9%8196–494

For 90% of these wells the report says where the water enters (the screen or the open hole), and we use the middle of that interval.

The layers under the center of Johnson City

From the state's model, at 1,213 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)
Upper Trinitylimestone and marl01111
Middle Trinitylimestone and sand115241

Depth over time

New home wells in and around Johnson City are deeper than 20 years ago: the median went from 304 feet (2003 to 2007) to 400 feet (2021 to 2025), 32% more. Deeper wells do not always mean the water dropped: a driller may be going for another layer, better water or more reserve.

PeriodMedian depth (ft)Wells
2001–200534236
2006–201035246
2011–201534117
2016–202032538
2021–202540079
2026under 10 wells8

What a well costs in Johnson City

At the median depth for Johnson City (385 feet), a complete home well would cost roughly $12,000 to $29,500: $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 (285 to 445 feet) the range runs from $9,500 to $33,000. 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 Johnson City, Texas?

Home water wells in and around Johnson City, Texas are typically 285 to 445 feet deep (median 385 ft, 125 wells drilled in the last 10 years). One in ten goes past 508 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 Johnson City draw from?

Nearly all end near or below the base of the Trinity (91%), according to the state's Hill Country Trinity 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 Johnson City?

At the median depth (385 feet), a complete well would cost roughly $12,000 to $29,500, 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 Johnson City?

When the wells were finished, the water stood a median 79 feet below the surface (82 wells), well above the bottom: the typical well holds about 306 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 Johnson City?

Johnson City is inside the Blanco-Pedernales 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 90% of these wells the report says where the water enters (the screen or the open hole), and we use the middle of that interval.

How well it works: In 2,665 wells in the Texas Hill Country 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 76% of them, and that layer or the one next to it in at least 98%.

  • The layers come from the Texas Water Development Board's Hill Country Trinity model, with 1 mile cells. 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.
  • "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/johnson-city-tx. License CC BY 4.0. https://doi.org/10.5281/zenodo.24126380.

Sources