Water wells in Frio County, Texas
1,290 well reports on file. The median well here was taken to 360 ft and struck water at 193 ft — against 180 ft and 80 ft across Texas.
What you will drill through in Frio County
| Depth, ft | What was logged there |
|---|---|
| 0–25 ft | Surface 267, Yellow Clay 140, Top Soil 138, Clay 122, Gravel 89, Sand 74 |
| 25–50 ft | Blue Shale 42, Sand 34, Shale 28, Gravel 21, Clay 17, Yellow Sand 17 |
| 50–100 ft | Shale 107, Sand 78, Blue Shale 71, Rock 37, Sandy Blue Shale 30, Sandy Shale 31 |
| 100–200 ft | Sand 193, Shale 134, Rock 49, Sandy Shale 65, Blue Shale 51, Gray Sand 35 |
| 200–300 ft | Sand 214, Shale 118, Rock 45, Blue Shale 54, Sandy Shale 56, Gray Sand 45 |
| 300–500 ft | Shale 172, Sand 159, Sandy Shale 53, Rock 32, Blue Shale 38, Clay 30 |
| 500–1000 ft | Shale 118, Sand 94, Sandy Shale 61, Sand, Shale Layers 15, Carrizo Sand 12, Rock 12 |
| 1000–5000 ft | Shale 68, Sand 51, Carrizo Sand 59, Sandy Shale 35, Carrizo 14, Sand (Carrizo) 14 |
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 Frio County
What the wells are for
| Purpose | Wells | Share | Median depth, ft |
|---|---|---|---|
| Domestic | 511 | 39.6% | 380 |
| Environmental Soil Boring | 196 | 15.2% | 10 |
| Irrigation | 191 | 14.8% | 1,145 |
| Stock | 174 | 13.5% | 320 |
| Monitor | 125 | 9.7% | 25 |
| Rig Supply | 34 | 2.6% | 1,900 |
| Industrial | 22 | 1.7% | 500 |
| Fracking Supply | 17 | 1.3% | 1,850 |
| Decade | Reports | Median depth, ft | Water at, ft |
|---|---|---|---|
| 1990s | 1 | 1,392 | 319 |
| 2000s | 265 | 300 | 120 |
| 2010s | 616 | 315 | 190 |
| 2020s | 408 | 420 | 230 |
The deepest reports on file
| Report | Year | Depth, ft | Water at, ft | Yield, gpm | Purpose |
|---|---|---|---|---|---|
| 667183 | 2024 | 4,500 | — | — | Irrigation |
| 667170 | 2024 | 4,100 | — | — | Irrigation |
| 210454 | 2005 | 4,100 | — | 1,000 | Irrigation |
| 482713 | 2015 | 3,899 | — | — | Irrigation |
| 37984 | 2003 | 3,788 | — | — | Irrigation |
| 38008 | 2003 | 3,780 | — | — | Irrigation |
| 525697 | 2019 | 3,008 | 400 | — | Fracking Supply |
| 497149 | 2018 | 2,909 | 234 | — | Rig Supply |
| 367114 | 2014 | 2,849 | 179 | — | Rig Supply |
| 358501 | 2014 | 2,840 | 475 | 525 | 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 Frio 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.