How deep are water wells in Trinity County, Texas?
Half of the home water wells drilled in Trinity County in the last 10 years are between 186 and 391 feet deep. The median is 274 feet, based on 136 driller reports filed with the state. Drillers measured the water standing a median 65 feet below the surface (115 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)
- 186 to 391 ft
- Median depth
- 274 feet
- Deepest 10% are past
- 472 feet
- Water level (median)
- 65 feet (115 wells)
- Yield (median)
- 20 gallons per minute (26% pump-tested)
- Wells used
- 136
- Period
- Last 10 years
- Latest report
- September 30, 2026
- Depth rank
- 120 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 |
|---|---|
| 50 to 100 | 4 |
| 100 to 150 | 17 |
| 150 to 200 | 21 |
| 200 to 250 | 19 |
| 250 to 300 | 13 |
| 300 to 350 | 15 |
| 350 to 400 | 17 |
| 400 to 450 | 11 |
| 450 to 500 | 7 |
| 500 to 550 | 10 |
| 600 to 650 | 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 |
|---|---|---|
| 2003 | 258 | 10 |
| 2006 | 120 | 20 |
| 2007 | 218 | 10 |
| 2008 | 241 | 12 |
| 2010 | 255 | 13 |
| 2011 | 240 | 13 |
| 2012 | 310 | 13 |
| 2013 | 352 | 18 |
| 2014 | 265 | 15 |
| 2016 | 215 | 13 |
| 2019 | 265 | 10 |
| 2020 | 209 | 17 |
| 2021 | 318 | 20 |
| 2022 | 300 | 17 |
| 2023 | 263 | 16 |
| 2024 | 230 | 13 |
| 2025 | 320 | 15 |
| 2026 | 360 | 13 |
Are wells in Trinity County getting deeper?
Home well depth in Trinity County has not changed meaningfully: the median was 220 feet in 2003 to 2007 and 290 feet in 2021 to 2025 (a difference under 10% or within the margin of error). The water level has not changed meaningfully (50 feet then, 80 feet now). Read the 20-year study.
Aquifers under the county
The Texas Water Development Board maps the Carrizo-Wilcox, a major aquifer, below other rock (subsurface) across 15% of the county; the Gulf Coast, a major aquifer, at the surface (outcrop) across 13% of the county; the Yegua-Jackson, a minor aquifer, under 88% of the county; the Sparta, a minor aquifer, under 28% of the county; the Queen City, a minor aquifer, under 8% of the county.
What a well costs in Trinity County
At the median depth for Trinity County (274 feet), a complete home well (drilling, casing, pump, pressure tank and hookup at the well) would cost roughly $9,500 to $23,000, 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
- Angelina County: median 186 ft
- Houston County: median 349 ft
- Polk County: median 205 ft
- San Jacinto County: median 208 ft
- Walker County: median 260 ft
Common questions
How deep do I need to drill a well in Trinity County?
The middle half of home wells drilled there are 186 to 391 feet deep; one in ten goes past 472 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 Trinity County?
At the median depth (274 feet), a complete well would cost roughly $9,500 to $23,000 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 Trinity County?
Drillers reported a median of 20 gallons per minute (117 wells). Only 26% of those figures come from a pump test; the rest are the driller's estimate, so treat them as a guide.
Are wells in Trinity County getting deeper?
Home well depth in Trinity County has not changed meaningfully: the median was 220 feet in 2003 to 2007 and 290 feet in 2021 to 2025 (a difference under 10% or within the margin of error). The water level has not changed meaningfully (50 feet then, 80 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