Water wells in the McMullen Groundwater Conservation District

Q: What does a groundwater conservation district do?

In Texas, districts are the local authority over groundwater: they can require registration or permits for new wells, set spacing from other wells and property lines, and limit pumping. Each district writes its own rules, so ask the McMullen Groundwater Conservation District before drilling inside it.

Home water wells inside the McMullen Groundwater Conservation District (McMullen County, Texas) are typically 225 to 535 feet deep (median 360 ft, 57 wells reported since 2001). Drillers reported 2 new home wells in 2025, less than half the peak of 9 in 2006. Estimated cost of a complete well at the median depth: $11,500 to $28,000.

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 point

Under the center of the McMullen GCD

District boundary from TWDB's file current as of November 2019. Later changes are not shown.

Home wells in and around the McMullen GCD

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+

Dark line: the district boundary (TWDB, 2019)

Key figures

Typical depth (middle half): 225 to 535 feet
Median depth: 360 feet
Deepest 10% are past: 1,912 feet
Water level (median): 150 feet; 55 wells
Yield (median): 20 gpm; 52 wells, gallons per minute
Wells used: 57; Since 2001
Counties: 1
All years on file: 57; median 360 ft, since 2003
Confidence: Standard (30 or more wells)

When the wells were finished, the water stood a median 150 feet below the surface (55 wells), well above the bottom: the typical well holds about 210 feet of water.

District boundary from TWDB's file current as of November 2019. Later changes are not shown.

New home wells per year

Drillers reported 2 new home wells in 2025, less than half the peak of 9 in 2006.

Domestic wells with a depth, by the year they were finished. 2026 is still in progress.

Show the data table

Year	Wells
2003	1
2004	4
2005	6
2006	9
2007	3
2008	2
2009	2
2010	3
2012	4
2013	4
2014	1
2015	3
2016	3
2017	4
2018	1
2021	2
2023	1
2025	2
2026	2

Counties

McMullen 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 the district are getting deeper. For reference, the median was 200 feet in 2001 to 2005 (11 wells) and 400 feet in 2011 to 2015 (12 wells).

Period	Median depth (ft)	Wells
2001–2005	200	11
2006–2010	275	19
2011–2015	400	12
2016–2020	under 10 wells	8
2021–2025	under 10 wells	5
2026	under 10 wells	2

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Common questions

How deep are wells in the McMullen GCD?

Home water wells inside the McMullen Groundwater Conservation District (McMullen County, Texas) are typically 225 to 535 feet deep (median 360 ft, 57 wells reported since 2001).

What does a groundwater conservation district do?

In Texas, districts are the local authority over groundwater: they can require registration or permits for new wells, set spacing from other wells and property lines, and limit pumping. Each district writes its own rules, so ask the McMullen Groundwater Conservation District before drilling inside it.

What a well costs here

At the median depth for the district (360 feet), a complete home well would cost roughly $11,500 to $28,000: $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 (225 to 535 feet) the range runs from $8,000 to $38,500. 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.

How these numbers are made

We count new and replacement domestic (home) wells whose coordinates fall inside the district boundary. 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/districts/mcmullen-groundwater-conservation-district. License CC BY 4.0. https://doi.org/10.5281/zenodo.24126380.