Water wells in Callahan County, Texas
989 well reports on file. The median well here was taken to 58 ft and struck water at 26 ft — against 180 ft and 80 ft across Texas.
What you will drill through in Callahan County
| Depth, ft | What was logged there |
|---|---|
| 0–25 ft | Sand 236, Top Soil 265, Sandy Clay 184, Clay 113, Red Clay 123, Brown Clay 133 |
| 25–50 ft | Red Clay 79, Sand 66, Sand & Gravel 71, Yellow Shale 71, Yellow Clay 57, Blue Shale 41 |
| 50–100 ft | Red Clay 47, Yellow Clay 40, Sand 36, Shale 28, Sand And Gravel 22, Clay 23 |
| 100–200 ft | Shale 27, Red Clay 20, Brown Clay 16, Sand 19, Sand And Gravel 15, Clay 13 |
| 200–300 ft | Red Clay 4, Brown Clay 4, Sand And Gravel 3, Gyp Rock 2, Yellow Clay 3, Gray Shale 3 |
| 300–500 ft | Grey Shale 1, Gyp Rock 1, Reddish Shale 1, Gray Limestone 1, Gray Shale 1, Black Shale & Coal 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 Callahan County
| Firm of record | Wells | Median depth, ft | Median yield, gpm | Years |
|---|---|---|---|---|
| Diversified Water Well Drilling | 168 | 50 | 10 | 2003–2017 |
| Michael Gilliam Consultant Services | 147 | 104 | 7 | 2004–2024 |
| F&F Drilling | 84 | 100 | 15 | 2003–2022 |
| AUTHENTIC DRILLING | 80 | 14 | — | 2020–2021 |
| White Drilling Company, Inc. | 74 | 52 | 30 | 2002–2025 |
| LEONARD WATER SERVICES | 47 | 54 | 15 | 2002–2025 |
| Moore's Pump & Supply | 37 | 55 | 12 | 2003–2016 |
| Jimmy D. Wilson Drilling | 34 | 85 | 15 | 2001–2012 |
| Zavala Drilling, CO | 32 | 47 | 10 | 2007–2013 |
| SIMMONS WATER WELL SERVICE | 23 | 140 | — | 2019–2026 |
| DIVERSIFIED WATER WELLS | 17 | 50 | 15 | 2009–2012 |
| T & T Drilling, LTD | 17 | 20 | — | 2006–2007 |
| Leonard Water Service | 14 | 50 | — | 2002–2008 |
| A&W Drilling Services, Ltd. | 13 | 55 | — | 2011 |
| Peterson Drilling & Testing, Inc. | 13 | — | — | 2005–2006 |
| DAVIS ENVIRONMENTAL DRILLING | 13 | 40 | — | 2002–2003 |
| Robert Caraway Water Well Drlg. | 9 | 130 | 15 | 2018–2026 |
| Lange Drilling Co | 9 | 60 | 8 | 2005–2017 |
| Simmons Drilling Co. | 9 | 60 | 12 | 2008–2012 |
| Moore's Pump & Supplies | 8 | 55 | 7 | 2013–2015 |
| Jimmy D. Wilson | 7 | 80 | 25 | 2001–2012 |
| T&T Drilling | 7 | 20 | — | 2003 |
| Foster Water Well Service | 6 | 115 | 15 | 2023–2025 |
| R&R DRILLING LLC | 6 | 234 | — | 2023–2024 |
| MUNDEN WATER WELL SERVICE | 6 | 52 | 6 | 2017–2019 |
What the wells are for
| Purpose | Wells | Share | Median depth, ft |
|---|---|---|---|
| Domestic | 311 | 31.4% | 60 |
| Irrigation | 284 | 28.7% | 57 |
| Monitor | 164 | 16.6% | 14 |
| Stock | 131 | 13.2% | 95 |
| Test Well | 43 | 4.3% | 102 |
| Other | 27 | 2.7% | 108 |
| Environmental Soil Boring | 26 | 2.6% | 15 |
| Closed-Loop Geothermal | 2 | 0.2% | 300 |
| Decade | Reports | Median depth, ft | Water at, ft |
|---|---|---|---|
| 2000s | 296 | 50 | 25 |
| 2010s | 422 | 60 | 28 |
| 2020s | 271 | 50 | 26 |
The deepest reports on file
| Report | Year | Depth, ft | Water at, ft | Yield, gpm | Purpose |
|---|---|---|---|---|---|
| 42179 | 2004 | 400 | — | — | Test Well |
| 666113 | 2024 | 380 | — | — | Stock |
| 605565 | 2022 | 348 | — | — | Test Well |
| 105579 | 2007 | 310 | 75 | 2 | Test Well |
| 639252 | 2023 | 300 | — | — | Closed-Loop Geothermal |
| 666875 | 2024 | 288 | 216 | — | Stock |
| 635480 | 2023 | 286 | 82 | — | Other |
| 729098 | 2026 | 280 | — | — | Stock |
| 616250 | 2022 | 280 | 190 | 40 | Domestic |
| 114740 | 2007 | 280 | — | — | 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 Callahan 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.