Water wells in Dallas County, Texas
24,764 well reports on file. The median well here was taken to 20 ft and struck water at 16 ft — against 180 ft and 80 ft across Texas.
What you will drill through in Dallas County
| Depth, ft | What was logged there |
|---|---|
| 0–25 ft | Concrete 2,627, Brown Clay 1,566, Dark Brown Clay 1,197, Clay 934, Tan Clay 957, Tan Limestone 772 |
| 25–50 ft | Gray Shale 210, Shale 158, Gray Limestone 85, Sand 71, Tan Sand 68, Grey Shale 61 |
| 50–100 ft | Shale 64, Gray Shale 58, Sand 13, Gravel 15, Blue Shale 12, Grey Shale 12 |
| 100–200 ft | Gray Shale 30, Sand 23, Blue Shale 11, Shale 15, Sandy Shale 10, Lime 8 |
| 200–300 ft | Sand 32, Gray Shale 22, Shale 18, Sandy Shale 9, Sand & Blue Shale 3, Blue Shale 4 |
| 300–500 ft | Sand 21, Gray Shale 17, Shale 8, Sandy Shale 8, Blue Shale 5, Sandy Gray Shale 4 |
| 500–1000 ft | Sand 37, Shale 22, Gray Shale 16, Sandy Shale 11, Gray Shale/Sand 10, Lime 7 |
| 1000–5000 ft | Sand 15, Shale 9, Gray Shale 5, Sandy Shale 7, Limestone 5, Sand And Shale 3 |
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 Dallas County
What the wells are for
| Purpose | Wells | Share | Median depth, ft |
|---|---|---|---|
| Monitor | 14,362 | 58.0% | 25 |
| Environmental Soil Boring | 8,829 | 35.7% | 13 |
| Injection | 346 | 1.4% | 25 |
| Test Well | 341 | 1.4% | 20 |
| Closed-Loop Geothermal | 324 | 1.3% | 300 |
| Irrigation | 201 | 0.8% | 320 |
| Domestic | 169 | 0.7% | 52 |
| Other | 137 | 0.6% | 25 |
| Decade | Reports | Median depth, ft | Water at, ft |
|---|---|---|---|
| 1990s | 1 | — | 27 |
| 2000s | 9,363 | 20 | 17 |
| 2010s | 9,918 | 20 | 16 |
| 2020s | 5,482 | 20 | 15 |
The deepest reports on file
| Report | Year | Depth, ft | Water at, ft | Yield, gpm | Purpose |
|---|---|---|---|---|---|
| 659688 | 2023 | 3,035 | — | — | Monitor |
| 549273 | 2020 | 3,002 | — | — | Irrigation |
| 255992 | 2011 | 2,440 | 656 | 595 | Irrigation |
| 669777 | 2023 | 2,420 | 727 | — | Irrigation |
| 251662 | 2011 | 2,034 | 682 | 180 | Irrigation |
| 395825 | 2015 | 1,873 | 605 | 115 | Stock |
| 722460 | 2026 | 1,800 | 199 | 250 | Industrial |
| 628832 | 2022 | 1,790 | — | — | Irrigation |
| 667391 | 2024 | 1,780 | 717 | 300 | Stock |
| 297114 | 2011 | 1,740 | 750 | 38 | 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 Dallas 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.