Water wells in the Starr County Drainage and 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 Starr County Drainage and Groundwater Conservation District before drilling inside it.

Home water wells inside the Starr County Drainage and Groundwater Conservation District (Starr County, Texas) are consistently 428 to 492 feet deep (median 460 ft, 46 wells drilled in the last 10 years). Drillers reported 7 new home wells in 2025, less than half the peak of 31 in 2005. Estimated cost of a complete well at the median depth: $14,000 to $34,000.

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 Starr County Drainage and GCD

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

Home wells in and around the Starr County Drainage and 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): 428 to 492 feet
Median depth: 460 feet
Deepest 10% are past: 522 feet
Water level (median): 167 feet; 41 wells
Yield (median): 30 gpm; 43 wells, gallons per minute
Wells used: 46; In the last 10 years
Counties: 1
All years on file: 242; median 450 ft, since 2001
Confidence: Standard (30 or more wells)

When the wells were finished, the water stood a median 167 feet below the surface (41 wells), well above the bottom: the typical well holds about 293 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 7 new home wells in 2025, less than half the peak of 31 in 2005.

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

Show the data table

Year	Wells
2002	4
2003	29
2004	18
2005	31
2006	7
2007	13
2008	11
2009	11
2010	9
2011	16
2012	15
2013	13
2014	5
2015	6
2016	5
2017	5
2018	3
2019	1
2020	1
2021	14
2022	5
2023	5
2024	3
2025	7
2026	2

Places with the most wells in the district

Place	Median depth (ft)	Middle half (ft)	Wells	Main layer
San Isidro	210	120–425	16	—
Delmita	260	135–380	13	—
Santa Anna	430	390–460	11	—

Counties

Starr County

Depth over time

Home well depth in the district has not changed meaningfully in 20 years: the median was 440 feet in 2003 to 2007 and 462 feet in 2021 to 2025 (a difference under 10% or within the margin of error).

Period	Median depth (ft)	Wells
2001–2005	400	85
2006–2010	480	51
2011–2015	430	55
2016–2020	400	15
2021–2025	462	34
2026	under 10 wells	2

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Common questions

How deep are wells in the Starr County Drainage and GCD?

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 Starr County Drainage and Groundwater Conservation District before drilling inside it.

What a well costs here

At the median depth for the district (460 feet), a complete home well would cost roughly $14,000 to $34,000: $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 (428 to 492 feet) the range runs from $13,000 to $36,000. 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.

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/starr-county-groundwater-conservation-district. License CC BY 4.0. https://doi.org/10.5281/zenodo.24126380.