Water wells in Bexar County, Texas
24,830 well reports on file. The median well here was taken to 20 ft and struck water at 50 ft — against 180 ft and 80 ft across Texas.
What you will drill through in Bexar County
| Depth, ft | What was logged there |
|---|---|
| 0–25 ft | Concrete 991, Asphalt 869, Top Soil 537, Clay 441, Topsoil 405, Navarro 273 |
| 25–50 ft | Navarro 107, Sand 65, Rock 51, Shale 51, Clay 49, Navarro. 39 |
| 50–100 ft | Shale 160, Rock 142, Sand 137, Grey Shale 84, Gray Clay 59, Gray Limestone 36 |
| 100–200 ft | Rock 207, Shale 216, Sand 229, Sandy Shale 78, Grey Shale 73, Gray Clay 47 |
| 200–300 ft | Rock 158, Shale 161, Sand 179, Sandy Shale 61, Tan Limestone 64, Tan Lime 54 |
| 300–500 ft | Rock 105, Sand 126, Shale 113, Lt.Gray Lime 63, Grey Limestone 75, Tan Lime 59 |
| 500–1000 ft | Bexar Shale 69, Sand 33, Cow Creek 62, Shale 37, Grey Rock 43, Gray Limestone 31 |
| 1000–5000 ft | Sand 13, Shale 9, Cow Creek 12, Pine Island 10, Sandy Clay 5, Sandy Gray Shale 3 |
The rock column here is what drillers wrote down, layer by layer, in their own words — 5,345,462 layers across 707,856 wells. It is not a geological survey: two drillers may call the same clay by two names, and this site does not correct them.
Who drills in Bexar County
What the wells are for
| Purpose | Wells | Share | Median depth, ft |
|---|---|---|---|
| Environmental Soil Boring | 15,939 | 64.2% | 12 |
| Monitor | 5,328 | 21.5% | 28 |
| Domestic | 2,147 | 8.6% | 500 |
| Injection | 586 | 2.4% | 30 |
| Irrigation | 270 | 1.1% | 350 |
| Public Supply | 137 | 0.6% | 880 |
| Test Well | 134 | 0.5% | 30 |
| Other | 90 | 0.4% | 10 |
| Decade | Reports | Median depth, ft | Water at, ft |
|---|---|---|---|
| 1980s | 1 | 475 | 265 |
| 1990s | 16 | 460 | 280 |
| 2000s | 5,668 | 20 | 140 |
| 2010s | 13,547 | 20 | 24 |
| 2020s | 5,598 | 18 | 110 |
The deepest reports on file
| Report | Year | Depth, ft | Water at, ft | Yield, gpm | Purpose |
|---|---|---|---|---|---|
| 145796 | 2007 | 2,700 | — | — | Test Well |
| 140297 | 2007 | 2,460 | — | — | Monitor |
| 129150 | 2007 | 2,331 | 103 | 1,500 | Public Supply |
| 139120 | 2004 | 2,205 | 300 | 300 | Monitor |
| 604154 | 2022 | 2,160 | 0 | — | Irrigation |
| 186376 | 2009 | 2,000 | — | 830 | Public Supply |
| 694849 | 2025 | 1,994 | 51 | 2,200 | Monitor |
| 546473 | 2020 | 1,987 | 277 | 1,007 | Public Supply |
| 288431 | 2012 | 1,932 | — | 75 | Public Supply |
| 318440 | 2013 | 1,920 | 139 | 1,005 | Public Supply |
Every figure on this site is a median, never an average. On reported yield the average is twice the median, because a handful of entries are typing errors — the largest reads 2,200,100 gallons per minute against 30,078 for the next one. Yields above 3,000 gpm (136 wells, 0.045%) and depths beyond 5,000 ft (103 wells, 0.016%) are kept in the file, marked, and left out of the medians.
Drilling a well in Bexar County?
Depth is only half the quote. What it costs depends on the rock, the casing and the pump. Tell us where and we pass the request to licensed Texas drillers.
We are nobody's agent and have no arrangement with any firm today. What we do with this.
Counties with a comparable number of reports
A sliding window, not a ranking. Every county.