Water wells in McLennan County, Texas
1,784 well reports on file. The median well here was taken to 20 ft and struck water at 20 ft — against 180 ft and 80 ft across Texas.
What you will drill through in McLennan County
| Depth, ft | What was logged there |
|---|---|
| 0–25 ft | Brown Clay 169, Light Brown Clay 100, Clay 70, Limestone 66, Tan Limestone 58, Asphalt 57 |
| 25–50 ft | Shale 21, Gray Shale 18, Blue Shale 12, Gravel 10, Gray Limestone 9, Sand 9 |
| 50–100 ft | Shale 7, Blue Shale 3, Gray Clay 2, Gray Clay, Shale, Limestone 2, Eagle Ford Shale 2, Blue Clay With Streaks Of Blue Sand 2 |
| 100–200 ft | Gray Shale 6, Limestone 5, Blue Shale 3, White Limestone 3, Sandy Shale 2, Grey Shale 2 |
| 200–300 ft | Black Shale 3, Gray Shale, Limestone 2, Blue Sandy Shell 2, Limestone 2, Sandy Shale 2, Gray Shale 2 |
| 300–500 ft | Shell Rock 12, Glen Rose Lime 10, Glenrose Lime 9, Paluxy Sand 7, Sandy Shale 5, Gray Clay, Shale, Limestone 5 |
| 500–1000 ft | Sandy Shale 20, Sand 14, Blue Shale 13, 1St Trinity Sand 13, Red Clay 11, Blue Sandy Clay And Sand 5 |
| 1000–5000 ft | Sand 22, Red Clay 18, Red Bed 12, Yellow Clay 14, Yellow 12, Sandy Shale 7 |
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 McLennan County
What the wells are for
| Purpose | Wells | Share | Median depth, ft |
|---|---|---|---|
| Monitor | 845 | 47.4% | 25 |
| Environmental Soil Boring | 541 | 30.3% | 10 |
| Domestic | 142 | 8.0% | 1,035 |
| Injection | 95 | 5.3% | 20 |
| Closed-Loop Geothermal | 40 | 2.2% | 300 |
| Test Well | 34 | 1.9% | 25 |
| Irrigation | 24 | 1.3% | 80 |
| Public Supply | 20 | 1.1% | 1,983 |
| Decade | Reports | Median depth, ft | Water at, ft |
|---|---|---|---|
| 2000s | 471 | 20 | 20 |
| 2010s | 867 | 20 | 20 |
| 2020s | 446 | 25 | 20 |
The deepest reports on file
| Report | Year | Depth, ft | Water at, ft | Yield, gpm | Purpose |
|---|---|---|---|---|---|
| 224079 | 2010 | 3,345 | 440 | 226 | Public Supply |
| 532081 | 2020 | 3,010 | 497 | 250 | Other |
| 277481 | 2011 | 3,000 | 499 | 17 | Irrigation |
| 69313 | 2005 | 2,710 | 580 | 305 | Public Supply |
| 131794 | 2007 | 2,509 | 625 | 640 | Industrial |
| 176489 | 2009 | 2,507 | 742 | 281 | Public Supply |
| 253315 | 2011 | 2,500 | 813 | 750 | Public Supply |
| 122796 | 2007 | 2,463 | 583 | 183 | Public Supply |
| 502608 | 2018 | 2,135 | 795 | 33 | Public Supply |
| 476811 | 2018 | 2,100 | 752 | 403 | Public 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 McLennan 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.