How deep are water wells in Mills County, Texas?
Half of the home water wells drilled in Mills County in the last 10 years are between 204 and 420 feet deep. The median is 302 feet, based on 220 driller reports filed with the state. Drillers measured the water standing a median 135 feet below the surface (155 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)
- 204 to 420 ft
- Median depth
- 302 feet
- Deepest 10% are past
- 480 feet
- Water level (median)
- 135 feet (155 wells)
- Yield (median)
- 10 gallons per minute (0% pump-tested)
- Wells used
- 220
- Period
- Last 10 years
- Latest report
- October 23, 2026
- Depth rank
- 111 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 |
|---|---|
| 0 to 50 | 1 |
| 50 to 100 | 4 |
| 100 to 150 | 17 |
| 150 to 200 | 26 |
| 200 to 250 | 30 |
| 250 to 300 | 22 |
| 300 to 350 | 26 |
| 350 to 400 | 24 |
| 400 to 450 | 28 |
| 450 to 500 | 23 |
| 500 to 550 | 7 |
| 550 to 600 | 4 |
| 600 to 650 | 6 |
| 1,000 to 1,250 | 2 |
Median depth by year
Median depth of home wells finished each year. Years with fewer than 10 wells are not shown.
| Year | Median (ft) | Wells |
|---|---|---|
| 2002 | 202 | 10 |
| 2003 | 264 | 25 |
| 2004 | 300 | 38 |
| 2005 | 266 | 40 |
| 2006 | 304 | 43 |
| 2007 | 280 | 47 |
| 2008 | 290 | 39 |
| 2009 | 320 | 29 |
| 2010 | 260 | 15 |
| 2011 | 368 | 30 |
| 2012 | 350 | 12 |
| 2013 | 320 | 13 |
| 2015 | 340 | 11 |
| 2016 | 284 | 11 |
| 2017 | 455 | 10 |
| 2018 | 320 | 13 |
| 2020 | 320 | 23 |
| 2021 | 355 | 30 |
| 2022 | 250 | 46 |
| 2023 | 290 | 27 |
| 2024 | 340 | 33 |
| 2025 | 300 | 15 |
| 2026 | 289 | 14 |
Are wells in Mills County getting deeper?
Home well depth in Mills County has not changed meaningfully: the median was 290 feet in 2003 to 2007 and 300 feet in 2021 to 2025 (a difference under 10% or within the margin of error). The water level has not changed meaningfully (150 feet then, 135 feet now). Read the 20-year study.
Aquifers under the county
The Texas Water Development Board maps the Trinity, a major aquifer, below other rock (subsurface) across 40% of the county and at the surface (outcrop) across 35% of the county; the Cross Timbers, a minor aquifer, under 31% of the county; the Hickory, a minor aquifer, under 9% of the county; the Ellenburger-San Saba, a minor aquifer, under 9% of the county.
What a well costs in Mills County
At the median depth for Mills County (302 feet), a complete home well (drilling, casing, pump, pressure tank and hookup at the well) would cost roughly $10,000 to $24,500, 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
- Brown County: median 198 ft
- Comanche County: median 158 ft
- Hamilton County: median 475 ft
- Lampasas County: median 346 ft
- San Saba County: median 285 ft
Common questions
How deep do I need to drill a well in Mills County?
The middle half of home wells drilled there are 204 to 420 feet deep; one in ten goes past 480 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 Mills County?
At the median depth (302 feet), a complete well would cost roughly $10,000 to $24,500 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 Mills County?
Drillers reported a median of 10 gallons per minute (191 wells). Only 0% of those figures come from a pump test; the rest are the driller's estimate, so treat them as a guide.
Are wells in Mills County getting deeper?
Home well depth in Mills County has not changed meaningfully: the median was 290 feet in 2003 to 2007 and 300 feet in 2021 to 2025 (a difference under 10% or within the margin of error). The water level has not changed meaningfully (150 feet then, 135 feet now).
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
- Texas Water Development Board, Submitted Driller's Reports database (file of 2026-11-10)
- U.S. Census Bureau, 2024 cartographic boundary file, counties (1:500,000) (file of 2025-04-10)
- Texas Water Development Board, major aquifers (updated December 2006) (file of 2007-01-03)
- Texas Water Development Board, minor aquifers (updated December 2017) (file of 2017-12-15)
- TWDB well report viewer