How deep are water wells in Grimes County, Texas?
Half of the home water wells drilled in Grimes County in the last 10 years are between 214 and 374 feet deep. The median is 295 feet, based on 1,117 driller reports filed with the state. Drillers measured the water standing a median 90 feet below the surface (998 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)
- 214 to 374 ft
- Median depth
- 295 feet
- Deepest 10% are past
- 440 feet
- Water level (median)
- 90 feet (998 wells)
- Yield (median)
- 35 gallons per minute (2% pump-tested)
- Wells used
- 1,117
- Period
- Last 10 years
- Latest report
- October 14, 2026
- Depth rank
- 116 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 | 18 |
| 100 to 150 | 60 |
| 150 to 200 | 140 |
| 200 to 250 | 172 |
| 250 to 300 | 171 |
| 300 to 350 | 181 |
| 350 to 400 | 160 |
| 400 to 450 | 118 |
| 450 to 500 | 50 |
| 500 to 550 | 22 |
| 550 to 600 | 9 |
| 600 to 650 | 8 |
| 650 to 700 | 7 |
| 2,000 to 5,000+ | 1 |
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 | 282 | 68 |
| 2003 | 280 | 91 |
| 2004 | 289 | 101 |
| 2005 | 280 | 82 |
| 2006 | 294 | 125 |
| 2007 | 285 | 97 |
| 2008 | 300 | 86 |
| 2009 | 300 | 75 |
| 2010 | 280 | 79 |
| 2011 | 284 | 97 |
| 2012 | 346 | 64 |
| 2013 | 285 | 102 |
| 2014 | 283 | 99 |
| 2015 | 302 | 92 |
| 2016 | 305 | 124 |
| 2017 | 340 | 94 |
| 2018 | 290 | 94 |
| 2019 | 265 | 101 |
| 2020 | 300 | 117 |
| 2021 | 285 | 120 |
| 2022 | 282 | 117 |
| 2023 | 280 | 120 |
| 2024 | 283 | 118 |
| 2025 | 295 | 131 |
| 2026 | 288 | 84 |
Are wells in Grimes County getting deeper?
Home well depth in Grimes County has not changed meaningfully: the median was 288 feet in 2003 to 2007 and 285 feet in 2021 to 2025 (a difference under 10% or within the margin of error). The water level has not changed meaningfully (96 feet then, 98 feet now). Read the 20-year study.
Aquifers under the county
The Texas Water Development Board maps the Gulf Coast, a major aquifer, at the surface (outcrop) across 56% of the county; the Carrizo-Wilcox, a major aquifer, below other rock (subsurface) across 6% of the county; the Yegua-Jackson, a minor aquifer, under 45% of the county; the Sparta, a minor aquifer, under 34% of the county; the Queen City, a minor aquifer, under 13% of the county; the Brazos River Alluvium, a minor aquifer, under 5% of the county.
What a well costs in Grimes County
At the median depth for Grimes County (295 feet), a complete home well (drilling, casing, pump, pressure tank and hookup at the well) would cost roughly $10,000 to $24,000, 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
- Brazos County: median 360 ft
- Madison County: median 366 ft
- Montgomery County: median 215 ft
- Walker County: median 260 ft
- Waller County: median 240 ft
- Washington County: median 236 ft
Common questions
How deep do I need to drill a well in Grimes County?
The middle half of home wells drilled there are 214 to 374 feet deep; one in ten goes past 440 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 Grimes County?
At the median depth (295 feet), a complete well would cost roughly $10,000 to $24,000 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 Grimes County?
Drillers reported a median of 35 gallons per minute (987 wells). Only 2% of those figures come from a pump test; the rest are the driller's estimate, so treat them as a guide.
Are wells in Grimes County getting deeper?
Home well depth in Grimes County has not changed meaningfully: the median was 288 feet in 2003 to 2007 and 285 feet in 2021 to 2025 (a difference under 10% or within the margin of error). The water level has not changed meaningfully (96 feet then, 98 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