How deep are water wells in Castro County, Texas?

Half of the home water wells drilled in Castro County in the last 10 years are between 328 and 403 feet deep. The median is 378 feet, based on 97 driller reports filed with the state. Drillers measured the water standing a median 279 feet below the surface (23 wells). That is deeper than the Texas median of 250 feet.

Updated every day from Texas Water Development Board driller reports. Last update: November 10, 2026, using the state file of November 9, 2026. 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.

Key figures

Typical depth (middle half)
328 to 403 ft
Median depth
378 feet
Deepest 10% are past
430 feet
Water level (median)
279 feet (23 wells)
Yield (median)
10 gallons per minute (50% pump-tested)
Wells used
97
Period
Last 10 years
Latest report
September 16, 2026
Depth rank
75 of 245 (1 = deepest)
Confidence
Standard

How deep the wells are

Number of home wells by depth, last 10 years (or since 2001 where wells are few).

Depth (ft)Wells
150 to 2001
200 to 2507
250 to 30011
300 to 35013
350 to 40029
400 to 45030
450 to 5005
500 to 5501

Median depth by year

Median depth of home wells finished each year. Years with fewer than 10 wells are not shown.

YearMedian (ft)Wells
200531812
200836612
201735810
202036210
202140021
202339917
202433613

Are wells in Castro County getting deeper?

Home well depth in Castro County has not changed meaningfully: the median was 358 feet in 2003 to 2007 and 386 feet in 2021 to 2025 (a difference under 10% or within the margin of error). Read the 20-year study.

Aquifers under the county

The Texas Water Development Board maps the Ogallala, a major aquifer, at the surface (outcrop) across 100% of the county; the Dockum, a minor aquifer, under 8% of the county.

What a well costs in Castro County

At the median depth for Castro County (378 feet), a complete home well (drilling, casing, pump, pressure tank and hookup at the well) would cost roughly $12,000 to $29,000, by TerraFunded's estimate from published Texas prices. Trenching and the line to the house are extra. Get quotes from at least two licensed drillers.

Neighboring counties

Common questions

How deep do I need to drill a well in Castro County?

The middle half of home wells drilled there are 328 to 403 feet deep; one in ten goes past 430 feet. The depth a given tract needs depends on where it is and what layers the driller hits.

How much does a water well cost in Castro County?

At the median depth (378 feet), a complete well would cost roughly $12,000 to $29,000 by TerraFunded's estimate from published Texas driller prices ($25 to $60 per foot plus pump and equipment). The real price comes from a driller's quote.

How much water does a well produce in Castro County?

Drillers reported a median of 10 gallons per minute (10 wells). Only 50% of those figures come from a pump test; the rest are the driller's estimate, so treat them as a guide.

Are wells in Castro County getting deeper?

Home well depth in Castro County has not changed meaningfully: the median was 358 feet in 2003 to 2007 and 386 feet in 2021 to 2025 (a difference under 10% or within the margin of error).

How do I see the well report for a property or a neighbor's well?

Every well drilled in Texas since 2001 has a public driller's report. On this page's map, tap a well to open its official report on the state's site, or look it up by location in the TWDB viewer.

How to read these numbers

Figures cover new and replacement domestic (home) wells, from the reports licensed drillers file with the state. Read the full methodology. Download the county table (CSV).

How to cite: TerraFunded Texas Well Atlas, from Texas Water Development Board driller reports (data as of November 9, 2026). https://terrafunded.com/wells

Sources

All counties