Water wells in Zavala County, Texas
658 well reports on file. The median well here was taken to 320 ft and struck water at 264 ft — against 180 ft and 80 ft across Texas.
What you will drill through in Zavala County
| Depth, ft | What was logged there |
|---|---|
| 0–25 ft | Top Soil 80, Yellow Clay 72, Topsoil 54, Surface 52, Shale 36, Brown Clay 35 |
| 25–50 ft | Yellow Clay 21, Clay 21, Gray Shale 14, Gray Sandy Shale 13, Gravel 13, Blue Shale 9 |
| 50–100 ft | Gray Sandy Shale 31, Shale 30, Gray Shale 25, Blue Shale 19, Blue Clay 10, Clay 10 |
| 100–200 ft | Shale 32, Gray Shale 22, Sand 22, Gray Sand 21, Gray Sandy Shale 17, Blue Shale 18 |
| 200–300 ft | Sand 34, Shale 22, Blue Shale 22, Gray Shale 20, Sandy Shale 16, Carrizo Sand 10 |
| 300–500 ft | Shale 63, Sand 58, Sandy Shale 28, Gray Shale 21, Blue Shale 16, Blue Clay 8 |
| 500–1000 ft | Shale 40, Sand 41, Carrizo Sand 26, Sandy Shale 13, Sand (Carrizo) 11, Sand/Shale 10 |
| 1000–5000 ft | Shale 26, Carrizo Sand 19, Sand 12, Carrizo 11, Sandy Shale 7, Gray Clay 7 |
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 Zavala County
What the wells are for
| Purpose | Wells | Share | Median depth, ft |
|---|---|---|---|
| Environmental Soil Boring | 159 | 24.2% | 10 |
| Domestic | 138 | 21.0% | 400 |
| Stock | 138 | 21.0% | 300 |
| Irrigation | 103 | 15.7% | 650 |
| Rig Supply | 50 | 7.6% | 1,500 |
| Monitor | 41 | 6.2% | 42 |
| Fracking Supply | 15 | 2.3% | 1,681 |
| Public Supply | 6 | 0.9% | 916 |
| Decade | Reports | Median depth, ft | Water at, ft |
|---|---|---|---|
| 1980s | 2 | 1,058 | 319 |
| 2000s | 166 | 220 | 160 |
| 2010s | 376 | 340 | 275 |
| 2020s | 114 | 395 | 320 |
The deepest reports on file
| Report | Year | Depth, ft | Water at, ft | Yield, gpm | Purpose |
|---|---|---|---|---|---|
| 350374 | 2013 | 1,950 | — | — | Rig Supply |
| 210577 | 2010 | 1,910 | 305 | 300 | Rig Supply |
| 543573 | 2020 | 1,900 | 590 | — | Fracking Supply |
| 352561 | 2014 | 1,890 | 460 | 200 | Fracking Supply |
| 543566 | 2020 | 1,870 | 606 | — | Fracking Supply |
| 542543 | 2015 | 1,861 | — | — | Irrigation |
| 648225 | 2023 | 1,860 | 688 | 800 | Rig Supply |
| 360621 | 2014 | 1,860 | 500 | 420 | Fracking Supply |
| 352168 | 2014 | 1,854 | 540 | 210 | Fracking Supply |
| 524254 | 2019 | 1,853 | 350 | — | Rig 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 Zavala 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.