# Well grid 66-20, Texas — Colorado — how deep, and through what

> 381 well reports in Texas state well grid 66-20, covering Colorado. Median depth 165 ft.

## Texas well grid 66-20

A 7.5-minute quadrangle of the Texas state well grid, mostly in [Colorado County](/county/colorado.md). **381** reports, median depth **165 ft**.

### What you will drill through in grid 66-20

*Logged in state well grid 66-20, by depth. The figure is how many wells hit it.*

| Depth, ft | What was logged there |
|---|---|
| 0–25 ft | **Topsoil** 66 , **Top Soil** 60 , **Sand** 45 , **Sand & Gravel** 43 , **Red Clay** 42 , **Top-Soil** 33 |
| 25–50 ft | **Sand** 40 , **Red Clay** 21 , **White Clay** 20 , **Gravel** 20 , **Sand & Gravel** 20 , **Tan Clay** 16 |
| 50–100 ft | **Sand** 84 , **Rock** 33 , **Tan Clay** 28 , **White Clay** 23 , **Clay** 21 , **Red Clay** 18 |
| 100–200 ft | **Sand** 97 , **Rock** 66 , **Tan Clay** 41 , **Clay** 31 , **Sand & Rock** 33 , **White Clay** 22 |
| 200–300 ft | **Sand** 47 , **Rock** 31 , **Clay** 14 , **Tan Clay** 9 , **White Clay** 8 , **Sand & Rock** 8 |
| 300–500 ft | **Clay** 7 , **Sand** 4 , **Shale** 3 , **Gray Clay** 2 , **Sand & Rocks** 2 , **Hard Blue Shale** 1 |
| 500–1000 ft | **Hard Shale** 1 , **Shale** 2 , **Rock & Sand Streaks** 1 , **Hard Rock & Lignite** 1 , **Shale & Rock** 1 , **Coarse Gray Sand With Some Shale Streaks** 1 |

### Who drills here

*Licensed firms in state well grid 66-20, busiest first.*

| Firm of record | Wells | Median depth, ft | Median yield, gpm | Years |
|---|---|---|---|---|
| [Neuendorff's Water Well Svc., Inc.](/driller/neuendorff-s-water-well-svc-inc.md) | 98 | 165 | 40 | 2003–2014 |
| [Neuendorff's Water Well Service, Inc.](/driller/neuendorff-s-water-well-service-inc.md) | 84 | 165 | 50 | 2004–2026 |
| [Skutca Water Well](/driller/skutca-water-well.md) | 46 | 190 | 40 | 2001–2022 |
| [Texas Southern Drilling](/driller/texas-southern-drilling.md) | 24 | 165 | 35 | 2020–2026 |
| [Vortex Drilling, Inc.](/driller/vortex-drilling-inc.md) | 21 | 20 | — | 2006–2019 |
| [J&S WATER WELLS](/driller/j-s-water-wells.md) | 11 | 350 | 135 | 2007–2023 |
| [Busselman Water Wells, LLC](/driller/busselman-water-wells-llc.md) | 9 | 225 | 45 | 2024–2026 |
| [Joe Ferguson Water Well Drilling, Inc.](/driller/joe-ferguson-water-well-drilling-inc.md) | 9 | 320 | — | 2008–2011 |
| [Cobra Water Well Drilling, LLC.](/driller/cobra-water-well-drilling-llc.md) | 8 | 170 | 50 | 2011–2024 |
| [Mathers Environmental Drilling Inc.](/driller/mathers-environmental-drilling-inc.md) | 7 | 30 | — | 2004–2005 |
| [Envirotech Drilling Services LLC](/driller/envirotech-drilling-services-llc.md) | 6 | 30 | — | 2019–2023 |
| [Jones Environmental, Inc.](/driller/jones-environmental-inc.md) | 6 | 40 | — | 2007 |
| [B&R Water Well Service, LLC](/driller/b-r-water-well-service-llc.md) | 4 | 126 | 35 | 2013–2017 |
| [Bluebonnet Water Wells](/driller/bluebonnet-water-wells.md) | 3 | 330 | 150 | 2025–2026 |
| [MARAL DRILLING](/driller/maral-drilling.md) | 3 | 240 | 30 | 2019–2023 |
| [Pacific West Environmental and Infrastructure](/driller/pacific-west-environmental-and-infrastructure.md) | 3 | 40 | — | 2024 |
| [BEST DRILLING SERVICES, INC.](/driller/best-drilling-services-inc.md) | 3 | 35 | — | 2024 |
| [WALKER HILL ENVIRONMENTAL INC](/driller/walker-hill-environmental-inc.md) | 3 | 80 | — | 2015 |
| [A.W. Flentge Service](/driller/a-w-flentge-service.md) | 3 | 150 | 45 | 2005–2011 |
| [J & S Drilling, LLC](/driller/j-s-drilling-llc.md) | 2 | 275 | 50 | 2015 |
| [HEFLIN WATER WORKS](/driller/heflin-water-works.md) | 2 | 115 | 60 | 2010 |
| [Burleson Services, Inc.](/driller/burleson-services-inc.md) | 2 | 220 | 100 | 2006–2007 |
| [Vrana Well Service Inc.](/driller/vrana-well-service-inc.md) | 2 | 253 | 15 | 2007 |
| [Austin County Water Well](/driller/austin-county-water-well.md) | 2 | 300 | 100 | 2006 |
| [dba Universal Drilling Services](/driller/dba-universal-drilling-services.md) | 2 | 40 | — | 2005 |

### What the wells are for

*Purpose, and how deep each went.*

| Purpose | Wells | Share | Median depth, ft |
|---|---|---|---|
| Domestic | 257 | 67.5% | 169 |
| Monitor | 37 | 9.7% | 35 |
| Stock | 22 | 5.8% | 170 |
| Rig Supply | 14 | 3.7% | 320 |
| Industrial | 12 | 3.1% | 158 |
| Environmental Soil Boring | 11 | 2.9% | 15 |
| Public Supply | 9 | 2.4% | 350 |
| Irrigation | 9 | 2.4% | 260 |

*By decade drilled.*

| Decade | Reports | Median depth, ft | Water at, ft |
|---|---|---|---|
| 2000s | 121 | 165 | 58 |
| 2010s | 140 | 160 | 66 |
| 2020s | 120 | 165 | 63 |

### The deepest reports on file

*Deepest reports in state well grid 66-20. Column one is the tracking number.*

| Report | Year | Depth, ft | Water at, ft | Yield, gpm | Purpose |
|---|---|---|---|---|---|
| 165278 | 2008 | 2,098 | 78 | — | Domestic |
| 191940 | 2007 | 1,030 | 51 | 413 | Public Supply |
| 448247 | 2017 | 750 | 50 | 100 | Rig Supply |
| 327108 | 2012 | 525 | 86 | 150 | Public Supply |
| 318311 | 2012 | 525 | 66 | 465 | Public Supply |
| 726457 | 2026 | 401 | 71 | 65 | Domestic |
| 236802 | 2010 | 380 | — | — | Rig Supply |
| 217364 | 2010 | 380 | — | — | Rig Supply |
| 645162 | 2023 | 350 | 48 | 70 | Domestic |
| 642963 | 2023 | 350 | 45 | 75 | 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 66-20?

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

- [06-01](/area/06-01.md)
- [39-30](/area/39-30.md)
- [59-47](/area/59-47.md)
- [65-01](/area/65-01.md)
- [66-13](/area/66-13.md)
- [66-06](/area/66-06.md)
- [34-33](/area/34-33.md)
- [02-61](/area/02-61.md)
- [81-04](/area/81-04.md)
- [35-37](/area/35-37.md)
- [65-62](/area/65-62.md)
- [66-40](/area/66-40.md)
- [79-03](/area/79-03.md)

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Página: https://texas-water-wells.pages.dev/area/66-20/
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