Water wells in Gillespie County, Texas
5,269 well reports on file. The median well here was taken to 220 ft and struck water at 104 ft — against 180 ft and 80 ft across Texas.
What you will drill through in Gillespie County
| Depth, ft | What was logged there |
|---|---|
| 0–25 ft | Topsoil 1,821, Brown Topsoil 678, Top Soil 381, Caliche 332, Brown Clay 325, Caliche & Limestone 263 |
| 25–50 ft | Red Clay 117, Brown Sand 80, Gray Shale & Clay 69, Gray Clay & Shale 63, Gray Shale & Limestone 63, Sand 42 |
| 50–100 ft | Red Clay 135, Brown Sand 110, Gray Limestone 74, Red Granite 62, Brown Limestone 58, Gray Shale & Clay 48 |
| 100–200 ft | Red Clay 152, Brown Sand 89, Gray Limestone 146, Red Granite 126, Brown Limestone 99, Solid Limestone 108 |
| 200–300 ft | Gray Limestone 100, Red Clay 74, Red Granite 66, Brown Limestone 57, Brown Sand 42, Solid Limestone 63 |
| 300–500 ft | Gray Limestone 63, Brown Limestone 60, Red Clay 53, Brown Sand 27, Water 10 Gpm 35, Gray Sand 18 |
| 500–1000 ft | Brown Limestone 17, Pink Dolomite 13, Red Limestone 11, Gray Limestone 9, Water 10 Gpm 8, Water 2 Gpm 6 |
| 1000–5000 ft | Red & White Sandstone 2, Pink Granite 2, White/Brown Limestone 1, Tan & Gray Sandstone With Red Shale 1, Red & White Sandstone - Water 10 Gpm 1, White Sandstone With Gray & Red Shale - Water 15 Gpm 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 Gillespie County
What the wells are for
| Purpose | Wells | Share | Median depth, ft |
|---|---|---|---|
| Domestic | 4,425 | 84.0% | 225 |
| Stock | 353 | 6.7% | 207 |
| Monitor | 113 | 2.1% | 25 |
| Irrigation | 88 | 1.7% | 240 |
| Environmental Soil Boring | 86 | 1.6% | 15 |
| Public Supply | 77 | 1.5% | 280 |
| Test Well | 52 | 1.0% | 300 |
| Injection | 37 | 0.7% | 45 |
| Decade | Reports | Median depth, ft | Water at, ft |
|---|---|---|---|
| 2000s | 1,765 | 200 | 100 |
| 2010s | 1,873 | 220 | 105 |
| 2020s | 1,631 | 240 | 108 |
The deepest reports on file
| Report | Year | Depth, ft | Water at, ft | Yield, gpm | Purpose |
|---|---|---|---|---|---|
| 582101 | 2021 | 2,238 | 100 | 60 | Domestic |
| 512963 | 2019 | 2,036 | — | 8 | Domestic |
| 695673 | 2025 | 1,305 | 283 | 45 | Domestic |
| 421230 | 2016 | 1,289 | 86 | 7 | Domestic |
| 462171 | 2017 | 1,247 | 382 | 18 | Domestic |
| 633515 | 2023 | 1,207 | 92 | 45 | Domestic |
| 460932 | 2017 | 1,138 | 310 | 35 | Domestic |
| 50665 | 2004 | 1,080 | 270 | 35 | Domestic |
| 694550 | 2025 | 1,067 | 94 | 30 | Domestic |
| 519937 | 2019 | 1,027 | 104 | 50 | Domestic |
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 Gillespie 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.