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How deep are water wells in Blanco, Texas?

Home water wells in and around Blanco, Texas are typically 384 to 450 feet deep (median 405 ft, 49 wells drilled in the last 10 years). Nearly all draw from the Middle Trinity (92%), according to the state's Hill Country Trinity model (TWDB). Estimated cost of a complete well at the median depth: $12,500 to $31,000.

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 pointBlanco County
What is under Blanco, TexasUnderground column at the center of Blanco: median well 405 ft, middle half 384 to 450 ft, water at 186 ft, and the layers of the state's model with their thickness.Upper Trinity: 0 to 54 ftUpper TrinityMiddle Trinity: 54 to 358 ftMiddle TrinityLower Trinity: 358 to 495 ftLower TrinityBelow the base of the Trinity0200400600ftGround level · 1,335 ft above sea levelMedian well: 405 ftWater standing in the well from 186 ftWater level186 ftMiddle half384–450 ftMedian well405 ft

Under Blanco, Blanco County

Layers at the center of Blanco from TWDB's Hill Country Trinity model (1 mile cells), at true depth scale. The well and the water are the median of 49 real wells.

Home wells in and around Blanco

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: Blanco and about 2 miles around it

Key figures

Typical depth (middle half)
384 to 450 feet
Median depth
405 feet
Deepest 10% are past
478 feet
Water level (median)
186 feet
28 wells
Yield (median)
19 gpm
44 wells, gallons per minute
Wells used
49
In the last 10 years
Inside the city limits
5
the rest within 2 miles
All years on file
166
median 424 ft, since 2001
Confidence
Standard (30 or more wells)

When the wells were finished, the water stood a median 186 feet below the surface (28 wells).

What is under Blanco, TexasUnderground column at the center of Blanco: median well 405 ft, middle half 384 to 450 ft, water at 186 ft, and the layers of the state's model with their thickness.Upper Trinity: 0 to 54 ftUpper TrinityMiddle Trinity: 54 to 358 ftMiddle TrinityLower Trinity: 358 to 495 ftLower TrinityBelow the base of the Trinity0200400600ftGround level · 1,335 ft above sea levelMedian well: 405 ftWater standing in the well from 186 ftWater level186 ftMiddle half384–450 ftMedian well405 ft
Layers at the center of Blanco from TWDB's Hill Country Trinity model (1 mile cells), at true depth scale. The well and the water are the median of 49 real wells.

Which formation do wells in Blanco draw from?

Nearly all draw from the Middle Trinity (92%), according to the state's Hill Country Trinity model (TWDB).

Only 71% bottom out inside the Middle Trinity: the rest keep going deeper but take their water from that layer.

Layer (state's model)ShareWellsTypical depth (ft)
Middle Trinity92%45384–443
Lower Trinity8%4—

For 98% 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 Blanco

From the state's model, at 1,335 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 marl05454
Middle Trinitylimestone and sand54358304
Lower Trinitysand and limestone358495137

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 Blanco are getting deeper. For reference, the median was 412 feet in 2001 to 2005 (30 wells) and 403 feet in 2021 to 2025 (25 wells).

PeriodMedian depth (ft)Wells
2001–200541230
2006–201045862
2011–201542218
2016–202042325
2021–202540325
2026under 10 wells6

What a well costs in Blanco

At the median depth for Blanco (405 feet), a complete home well would cost roughly $12,500 to $31,000: $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 (384 to 450 feet) the range runs from $12,000 to $33,500. 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 Blanco, Texas?

Home water wells in and around Blanco, Texas are typically 384 to 450 feet deep (median 405 ft, 49 wells drilled in the last 10 years). One in ten goes past 478 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 Blanco draw from?

Nearly all draw from the Middle Trinity (92%), 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 Blanco?

At the median depth (405 feet), a complete well would cost roughly $12,500 to $31,000, 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 Blanco?

When the wells were finished, the water stood a median 186 feet below the surface (28 wells). The level moves with drought and from one well to the next.

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

Blanco 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 98% 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/blanco-tx. License CC BY 4.0. https://doi.org/10.5281/zenodo.24126380.

Sources