Water wells in Castro County, Texas
1,975 well reports on file. The median well here was taken to 390 ft and struck water at 310 ft — against 180 ft and 80 ft across Texas.
What you will drill through in Castro County
| Depth, ft | What was logged there |
|---|---|
| 0–25 ft | Top Soil 798, Topsoil 638, Caliche 499, Sandy Clay 284, Caliche And Clay 232, Clay 206 |
| 25–50 ft | Sandstone 106, Sand 90, Sandy Clay 39, Sandstone And Clay 34, Clay 33, Sand, Sandstone 30 |
| 50–100 ft | Sand 180, Sandstone 122, Sandy Clay 88, Sand - Sandstone 46, Sand & Sandstone 45, Fine Sand, Sandstone 44 |
| 100–200 ft | Sand 193, Sandstone 165, Sandy Clay 119, Fine Sand, Sandstone 64, Clay 64, Sand, Sandstone 51 |
| 200–300 ft | Sand 252, Clay 145, Sandy Clay 100, Sandstone 93, Sand, Sandy Clay, Sandstone 51, Sand & Gravel 54 |
| 300–500 ft | Red Bed 703, Red Clay 305, Redbed 301, Gravel And Sand 178, Sand 154, Sand And Gravel 132 |
| 500–1000 ft | Red Clay 17, Red Clay + Shale 12, Red Clay & Shale 8, Red And Gray Clay + Shale 7, Red & Blue Clay + Shale 6, Red And Gray Clay 4 |
| 1000–5000 ft | Red Clay W/Shale 1, Fine Tight Dirty Sand W/Shale Mix + Shale Strips 2, Fine Tight Sand W/Hard Red Shale Strips 1, Fine Little Tight Gray Sand W/Hard Rock Strips 1, Fine Tight Gray Sand To Tight Red Shale 1, Tight Red Shale W/Hard Shale Strips 1 |
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 Castro County
What the wells are for
| Purpose | Wells | Share | Median depth, ft |
|---|---|---|---|
| Irrigation | 1,563 | 79.1% | 390 |
| Domestic | 174 | 8.8% | 370 |
| Test Well | 132 | 6.7% | 460 |
| Stock | 46 | 2.3% | 334 |
| Environmental Soil Boring | 32 | 1.6% | 16 |
| Monitor | 14 | 0.7% | 340 |
| Public Supply | 9 | 0.5% | 388 |
| Industrial | 2 | 0.1% | 435 |
| Decade | Reports | Median depth, ft | Water at, ft |
|---|---|---|---|
| 2000s | 401 | 380 | 264 |
| 2010s | 725 | 382 | 295 |
| 2020s | 849 | 397 | 343 |
The deepest reports on file
| Report | Year | Depth, ft | Water at, ft | Yield, gpm | Purpose |
|---|---|---|---|---|---|
| 548771 | 2020 | 1,100 | — | — | Test Well |
| 423059 | 2016 | 1,100 | — | — | Test Well |
| 134279 | 2007 | 1,060 | — | — | Test Well |
| 59287 | 2005 | 1,050 | — | — | Test Well |
| 59300 | 2005 | 1,040 | — | — | Test Well |
| 59296 | 2005 | 1,040 | — | — | Test Well |
| 59291 | 2005 | 1,040 | — | — | Test Well |
| 134363 | 2007 | 1,030 | — | — | Test Well |
| 134404 | 2007 | 1,026 | — | — | Irrigation |
| 280661 | 2011 | 1,020 | — | — | Test Well |
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 Castro 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.