Texas well grid 66-18
A 7.5-minute quadrangle of the Texas state well grid, mostly in Colorado County and Fayette County. 319 reports, median depth 156 ft.
319Reports
156 ftMedian depth
84 ftWater at
25 gpmMedian yield
What you will drill through in grid 66-18
| Depth, ft | What was logged there |
|---|---|
| 0–25 ft | Tan Clay 49, Clay 39, Top Soil 31, Brown Top Soil 26, Sand 24, Yellow Clay 19 |
| 25–50 ft | Tan Clay 30, Sand 16, Clay 14, Sandstone 9, Blue Clay 11, Brown Sand 8 |
| 50–100 ft | Tan Clay 42, Clay 25, Sand 24, Tan Sand 19, Rock 13, Blue Clay 16 |
| 100–200 ft | Tan Clay 37, Sand 37, Clay 34, Gray Sand 13, Rock 9, Blue Clay 11 |
| 200–300 ft | Sand 14, Clay 8, Rock 5, Tan Clay 7, Shale 6, Gray Sand 4 |
| 300–500 ft | Sand 9, Clay 9, Shale 3, Tan Clay 3, Blue Clay 3, Gray Sand W/ Shale 2 |
| 500–1000 ft | Sand & Pyrite 1, Clay & Pyrite 1, Sand 1, Clay 1, Hard Gray Shale 1, Sand/Clay 1 |
| 1000–5000 ft | Gray Hard Shale 1, Sandy,Clay,Pyrite 1, Clay & Pyrite 1 |
Who drills here
What the wells are for
| Purpose | Wells | Share | Median depth, ft |
|---|---|---|---|
| Domestic | 270 | 84.6% | 153 |
| Stock | 25 | 7.8% | 156 |
| Irrigation | 8 | 2.5% | 180 |
| Public Supply | 5 | 1.6% | 1,028 |
| Rig Supply | 3 | 0.9% | 240 |
| Environmental Soil Boring | 3 | 0.9% | — |
| Closed-Loop Geothermal | 2 | 0.6% | 250 |
| Other | 1 | 0.3% | 116 |
| Decade | Reports | Median depth, ft | Water at, ft |
|---|---|---|---|
| 2000s | 108 | 140 | 77 |
| 2010s | 117 | 160 | 80 |
| 2020s | 94 | 180 | 96 |
The deepest reports on file
| Report | Year | Depth, ft | Water at, ft | Yield, gpm | Purpose |
|---|---|---|---|---|---|
| 333067 | 2005 | 1,050 | 210 | 205 | Public Supply |
| 88198 | 2006 | 1,028 | 224 | 501 | Public Supply |
| 427584 | 2016 | 1,000 | 243 | 302 | Public Supply |
| 364303 | 2014 | 570 | 100 | 90 | Irrigation |
| 249009 | 2010 | 563 | 144 | 100 | Domestic |
| 378343 | 2014 | 525 | 62 | 20 | Domestic |
| 100054 | 2006 | 520 | 30 | 100 | Domestic |
| 21976 | 2003 | 513 | 195 | 80 | Irrigation |
| 332977 | 2004 | 490 | 120 | 60 | Industrial |
| 637247 | 2023 | 483 | 188 | 115 | Domestic |
Every figure here comes from a report a licensed driller filed on the day the work ended — sometimes decades ago. It describes what was found then, not what a well yields today, and it is not a statement that any well is sound, potable or still in use.
Drilling a well near grid 66-18?
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.
This grid falls in Colorado County, Fayette County, Lavaca County, Fort Bend County.