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How deep are water wells in San Diego, Texas?

Home water wells in and around San Diego, Texas are typically 320 to 526 feet deep (median 406 ft, 40 wells drilled in the last 10 years). 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 pointDuval County
What is under San Diego, TexasUnderground column at the center of San Diego: median well 406 ft, middle half 320 to 526 ft, water at 190 ft.No state layer model here yet0200400600800ftGround levelMedian well: 406 ftWater standing in the well from 190 ftWater level190 ftMiddle half320–526 ftMedian well406 ft

Under San Diego, Duval County

The well and the water are the median of 40 real wells. This atlas does not have a state layer model for this area yet.

Home wells in and around San Diego

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: San Diego and about 2 miles around it

Key figures

Typical depth (middle half)
320 to 526 feet
Median depth
406 feet
Deepest 10% are past
584 feet
Water level (median)
190 feet
28 wells
Yield (median)
17.5 gpm
36 wells, gallons per minute
Wells used
40
In the last 10 years
Inside the city limits
3
the rest within 2 miles
All years on file
105
median 365 ft, since 2001
Confidence
Standard (30 or more wells)

When the wells were finished, the water stood a median 190 feet below the surface (28 wells).

What is under San Diego, TexasUnderground column at the center of San Diego: median well 406 ft, middle half 320 to 526 ft, water at 190 ft.No state layer model here yet0200400600800ftGround levelMedian well: 406 ftWater standing in the well from 190 ftWater level190 ftMiddle half320–526 ftMedian well406 ft
The well and the water are the median of 40 real wells. This atlas does not have a state layer model for this area yet.

Which formation do wells in San Diego draw from?

We cannot say yet for San Diego. This atlas assigns layers with the TWDB layered models processed so far (the Northern Trinity and Woodbine model, the Hill Country Trinity model, the northern Gulf Coast Aquifer model and the High Plains Aquifer System model), and none covers this area with enough wells. The depth, water level and yield on this page do come from the real wells here.

See the aquifers mapped under Duval County

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 San Diego are getting deeper. For reference, the median was 320 feet in 2001 to 2005 (17 wells) and 395 feet in 2021 to 2025 (24 wells).

PeriodMedian depth (ft)Wells
2001–200532017
2006–201033024
2011–201548024
2016–202052211
2021–202539524
2026under 10 wells5

What a well costs in San Diego

At the median depth for San Diego (406 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 (320 to 526 feet) the range runs from $10,500 to $38,000. 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 San Diego, Texas?

Home water wells in and around San Diego, Texas are typically 320 to 526 feet deep (median 406 ft, 40 wells drilled in the last 10 years). One in ten goes past 584 feet. The depth a given tract needs depends on where it sits and what layers the driller hits.

How much does a water well cost in San Diego?

At the median depth (406 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 San Diego?

When the wells were finished, the water stood a median 190 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 San Diego?

San Diego is inside the Duval County 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.

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/san-diego-tx. License CC BY 4.0. https://doi.org/10.5281/zenodo.24126380.

Sources