Water wells in Comal County, Texas
4,997 well reports on file. The median well here was taken to 460 ft and struck water at 247 ft — against 180 ft and 80 ft across Texas.
What you will drill through in Comal County
| Depth, ft | What was logged there |
|---|---|
| 0–25 ft | Top Soil 593, Topsoil 449, Caliche 368, Tan Limestone 342, Yellow Limestone 251, Tan 171 |
| 25–50 ft | Tan Limestone 73, Grey Limestone 62, Gray Limestone 56, Lost Returns 48, Yellow Limestone 46, Gray Shale 35 |
| 50–100 ft | Tan Limestone 164, Grey Limestone 92, Gray Limestone 85, Lost Returns 86, Yellow Limestone 73, Tan 49 |
| 100–200 ft | Tan Limestone 211, Grey Limestone 169, Gray Limestone 146, Lost Returns 129, Tan 89, Yellow Limestone 86 |
| 200–300 ft | Tan Limestone 150, Grey Limestone 127, Gray Limestone 122, Gray L/S 80, Lost Returns 72, Tan 66 |
| 300–500 ft | Td 217, Tan Limestone 164, Gray Limestone 140, Grey Limestone 97, Gray Lime 69, Grey Shale 73 |
| 500–1000 ft | Td 197, Gray Limestone 57, Tan Limestone 45, Lower Glenrose 37, Shale 34, Brown Lime 28 |
| 1000–5000 ft | Cow Creek 26, Bexar Shale 19, Pine Island 9, Pine Island Shale 5, Brown Limestone 2, Partial- Gray & Brown Limestone 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 Comal County
What the wells are for
| Purpose | Wells | Share | Median depth, ft |
|---|---|---|---|
| Domestic | 3,685 | 73.7% | 490 |
| Environmental Soil Boring | 665 | 13.3% | 15 |
| Monitor | 258 | 5.2% | 33 |
| Public Supply | 105 | 2.1% | 620 |
| Irrigation | 93 | 1.9% | 440 |
| Industrial | 56 | 1.1% | 700 |
| Test Well | 39 | 0.8% | 440 |
| Stock | 38 | 0.8% | 460 |
| Decade | Reports | Median depth, ft | Water at, ft |
|---|---|---|---|
| 1980s | 1 | 620 | — |
| 1990s | 3 | 385 | 230 |
| 2000s | 1,833 | 480 | 249 |
| 2010s | 2,031 | 439 | 239 |
| 2020s | 1,129 | 440 | 262 |
The deepest reports on file
| Report | Year | Depth, ft | Water at, ft | Yield, gpm | Purpose |
|---|---|---|---|---|---|
| 426127 | 2016 | 4,110 | 296 | — | Domestic |
| 343600 | 2013 | 3,560 | 185 | — | Domestic |
| 604258 | 2021 | 1,555 | 233 | 15 | Test Well |
| 462775 | 2017 | 1,500 | 138 | — | Industrial |
| 238967 | 2010 | 1,497 | 260 | — | Test Well |
| 202377 | 2008 | 1,420 | 129 | — | Domestic |
| 567776 | 2020 | 1,405 | 150 | 140 | Industrial |
| 184314 | 2004 | 1,395 | — | 50 | Industrial |
| 247986 | 2010 | 1,380 | 122 | 800 | Public Supply |
| 190198 | 2009 | 1,360 | 194 | — | Industrial |
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 Comal 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.