Water wells in Williamson County, Texas
4,706 well reports on file. The median well here was taken to 520 ft and struck water at 340 ft — against 180 ft and 80 ft across Texas.
What you will drill through in Williamson County
| Depth, ft | What was logged there |
|---|---|
| 0–25 ft | Topsoil 746, Top Soil 590, Yellow Limestone 449, Gray Limestone 448, Caliche 400, Blue Lime 255 |
| 25–50 ft | Gray Limestone 257, Gray Lime 81, Blue Lime 70, Grey Limestone 60, Brown Limestone 52, Blue Limestone 44 |
| 50–100 ft | Gray Limestone 267, Brown Limestone 118, Gray Lime 110, Grey Limestone 64, Gray Shale 47, Blue Lime 42 |
| 100–200 ft | Gray Limestone 405, Brown Limestone 266, Gray Lime 90, Blue Clay 57, Brown Lime 74, Grey Limestone 68 |
| 200–300 ft | Gray Limestone 367, Brown Limestone 228, Gray Lime 95, Blue Clay 55, Blue Limestone & Shale 70, Brown Lime 69 |
| 300–500 ft | Gray Limestone 465, Sandstone 172, Gray Sandstone 236, Brown Limestone 237, Sand 151, White Limestone 187 |
| 500–1000 ft | Gray Limestone 367, Gray Sandstone 255, Sandstone 152, Brown Limestone 167, Grey Limestone 161, Trinity Sand 82 |
| 1000–5000 ft | Sand 2, Silty Clay 1, Hensell 2, Pearsall 2, Hammett 2, Sligo 2 |
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 Williamson County
What the wells are for
| Purpose | Wells | Share | Median depth, ft |
|---|---|---|---|
| Domestic | 2,787 | 59.2% | 553 |
| Environmental Soil Boring | 610 | 13.0% | 10 |
| Monitor | 466 | 9.9% | 30 |
| Irrigation | 386 | 8.2% | 710 |
| Test Well | 112 | 2.4% | 245 |
| Industrial | 80 | 1.7% | 850 |
| Public Supply | 77 | 1.6% | 565 |
| Stock | 73 | 1.6% | 550 |
| Decade | Reports | Median depth, ft | Water at, ft |
|---|---|---|---|
| 1980s | 1 | 840 | — |
| 1990s | 2 | 603 | 257 |
| 2000s | 1,452 | 505 | 289 |
| 2010s | 1,868 | 520 | 347 |
| 2020s | 1,383 | 520 | 384 |
The deepest reports on file
| Report | Year | Depth, ft | Water at, ft | Yield, gpm | Purpose |
|---|---|---|---|---|---|
| 494571 | 2017 | 4,440 | 401 | 100 | Domestic |
| 467347 | 2017 | 3,300 | 258 | — | Public Supply |
| 660041 | 2023 | 1,910 | 510 | 800 | Public Supply |
| 723750 | 2026 | 1,900 | — | — | Public Supply |
| 695755 | 2025 | 1,805 | 521 | 700 | Public Supply |
| 471886 | 2017 | 1,772 | 478 | 495 | Public Supply |
| 474707 | 2018 | 1,130 | — | 180 | Irrigation |
| 643211 | 2023 | 1,120 | — | — | Domestic |
| 686978 | 2024 | 1,100 | 504 | — | Irrigation |
| 686750 | 2024 | 1,100 | 563 | — | Irrigation |
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 Williamson 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.