# Well grid 66-21, Texas — Colorado — how deep, and through what

> 312 well reports in Texas state well grid 66-21, covering Colorado. Median depth 148 ft.

## Texas well grid 66-21

A 7.5-minute quadrangle of the Texas state well grid, mostly in [Colorado County](/county/colorado.md). **312** reports, median depth **148 ft**.

### What you will drill through in grid 66-21

*Logged in state well grid 66-21, by depth. The figure is how many wells hit it.*

| Depth, ft | What was logged there |
|---|---|
| 0–25 ft | **Topsoil** 62 , **Top Soil** 48 , **Sand** 43 , **Top-Soil** 42 , **Red Clay** 39 , **Clay** 34 |
| 25–50 ft | **Sand** 69 , **White Clay** 18 , **Red Clay** 15 , **Clay** 11 , **Tan & White Clay** 13 , **Gravel** 11 |
| 50–100 ft | **Sand** 104 , **White Clay** 47 , **Clay** 17 , **Red Clay** 18 , **Rock** 17 , **Red & White Clay** 10 |
| 100–200 ft | **Sand** 127 , **White Clay** 54 , **Rock** 51 , **Tan Clay** 34 , **Clay** 23 , **Red Clay** 15 |
| 200–300 ft | **Sand** 14 , **Tan Clay** 7 , **Clay** 5 , **Rock** 6 , **Sand & Rock** 3 , **Shale** 2 |
| 300–500 ft | **Sand** 8 , **Clay** 2 , **Sand & Rock Strks** 1 , **Yellow & Brown Clay** 1 , **Rock** 2 , **Sand & Rock Streaked** 1 |
| 500–1000 ft | **Clay** 2 , **Sand** 2 , **Sand And Shale Seam** 1 , **Shale** 1 |

### Who drills here

*Licensed firms in state well grid 66-21, busiest first.*

| Firm of record | Wells | Median depth, ft | Median yield, gpm | Years |
|---|---|---|---|---|
| [Neuendorff's Water Well Service, Inc.](/driller/neuendorff-s-water-well-service-inc.md) | 81 | 140 | 60 | 2008–2026 |
| [Neuendorff's Water Well Svc., Inc.](/driller/neuendorff-s-water-well-svc-inc.md) | 70 | 145 | 50 | 2003–2014 |
| [Skutca Water Well](/driller/skutca-water-well.md) | 45 | 138 | 40 | 2002–2021 |
| [Texas Southern Drilling](/driller/texas-southern-drilling.md) | 25 | 145 | 35 | 2020–2026 |
| [Busselman Water Wells, LLC](/driller/busselman-water-wells-llc.md) | 14 | 180 | 50 | 2024–2026 |
| [Cobra Water Well Drilling, LLC.](/driller/cobra-water-well-drilling-llc.md) | 8 | 190 | 90 | 2015–2026 |
| [A.W. Flentge Service](/driller/a-w-flentge-service.md) | 8 | 145 | 60 | 2007–2020 |
| [TIM FRANKS WATER WELL SERVICE](/driller/tim-franks-water-well-service.md) | 5 | 265 | 45 | 2023–2025 |
| [Geophysical Drilling, Inc.](/driller/geophysical-drilling-inc.md) | 5 | 200 | 35 | 2007–2022 |
| [Austin County Water Well Service](/driller/austin-county-water-well-service.md) | 5 | 190 | 40 | 2007–2011 |
| [Bluebonnet Water Wells](/driller/bluebonnet-water-wells.md) | 4 | 155 | 45 | 2024–2026 |
| [Cady's Water wells](/driller/cady-s-water-wells.md) | 3 | 210 | 2,000 | 2015–2025 |
| [Burleson Services, Inc.](/driller/burleson-services-inc.md) | 3 | 140 | 90 | 2004–2009 |
| [ONE STOP SEPTICS & WATER WELLS](/driller/one-stop-septics-water-wells.md) | 2 | 265 | 45 | 2026 |
| [Ricky Bonds Water Wells](/driller/ricky-bonds-water-wells.md) | 2 | 200 | 80 | 2006–2017 |
| [B&R Water Well Service, LLC](/driller/b-r-water-well-service-llc.md) | 2 | 170 | 40 | 2014–2017 |
| [Terra Power Drilling LLC](/driller/terra-power-drilling-llc.md) | 2 | 170 | 60 | 2009–2016 |
| [Joe Ferguson Water Well Drilling, Inc.](/driller/joe-ferguson-water-well-drilling-inc.md) | 2 | 150 | — | 2010 |
| [CHANDLER DRILLING INC](/driller/chandler-drilling-inc.md) | 2 | 144 | 80 | 2009 |
| [O'Day Drilling Company, Inc.](/driller/o-day-drilling-company-inc.md) | 1 | 125 | 30 | 2026 |
| [R&D Water Wells](/driller/r-d-water-wells.md) | 1 | 138 | 80 | 2024 |
| [Bell's Drilling Service](/driller/bell-s-drilling-service.md) | 1 | 113 | 20 | 2023 |
| [G.W.Davis Water Well Co LLC](/driller/g-w-davis-water-well-co-llc.md) | 1 | 160 | 30 | 2023 |
| [Main Stream Environmental](/driller/main-stream-environmental.md) | 1 | 171 | 40 | 2022 |
| Meyer water well drilling | 1 | 145 | 50 | 2020 |

### What the wells are for

*Purpose, and how deep each went.*

| Purpose | Wells | Share | Median depth, ft |
|---|---|---|---|
| Domestic | 258 | 82.7% | 145 |
| Stock | 21 | 6.7% | 165 |
| Industrial | 8 | 2.6% | 325 |
| Rig Supply | 8 | 2.6% | 180 |
| Irrigation | 8 | 2.6% | 380 |
| Other | 6 | 1.9% | 275 |
| Public Supply | 3 | 1.0% | 300 |

*By decade drilled.*

| Decade | Reports | Median depth, ft | Water at, ft |
|---|---|---|---|
| 2000s | 94 | 146 | 57 |
| 2010s | 95 | 155 | 62 |
| 2020s | 123 | 145 | 58 |

### The deepest reports on file

*Deepest reports in state well grid 66-21. Column one is the tracking number.*

| Report | Year | Depth, ft | Water at, ft | Yield, gpm | Purpose |
|---|---|---|---|---|---|
| 64860 | 2005 | 1,183 | 106 | — | Domestic |
| 61683 | 2003 | 607 | 28 | 200 | Public Supply |
| 433040 | 2016 | 560 | 42 | 2,000 | Irrigation |
| 380097 | 2014 | 450 | 80 | 70 | Irrigation |
| 315694 | 2013 | 430 | 40 | 216 | Industrial |
| 534019 | 2020 | 385 | 19 | 1,500 | Other |
| 486044 | 2018 | 380 | 85 | 810 | Irrigation |
| 238929 | 2006 | 371 | 55 | — | Domestic |
| 707543 | 2025 | 360 | 113 | — | Domestic |
| 333644 | 2011 | 350 | 110 | 40 | 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 66-21?

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](/privacy.md).

This grid falls in [Colorado County](/county/colorado.md).

### Grids with a comparable number of reports

- [21-42](/area/21-42.md)
- [31-62](/area/31-62.md)
- [62-33](/area/62-33.md)
- [68-05](/area/68-05.md)
- [68-07](/area/68-07.md)
- [79-02](/area/79-02.md)
- [60-48](/area/60-48.md)
- [67-24](/area/67-24.md)
- [02-63](/area/02-63.md)
- [39-39](/area/39-39.md)
- [56-48](/area/56-48.md)
- [79-21](/area/79-21.md)
- [23-27](/area/23-27.md)

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Página: https://texas-water-wells.pages.dev/area/66-21/
Fonte: Texas Submitted Driller's Report Database — Texas Water Development Board, from reports filed with the Texas Department of Licensing and Regulation
Recolha: 2026-08-23