# Water wells in Collin County, Texas — how deep, and through what

> 4,321 well reports filed in Collin County since 2001. Median depth 20 ft, water struck at 441 ft, median yield 24 gpm.

## Water wells in Collin County, Texas

**4,321** well reports on file. The median well here was taken to **20 ft** and struck water at **441 ft** — against 180 ft and 80 ft across Texas.

### What you will drill through in Collin County

*Logged in Collin County, by depth. The figure is how many wells hit it.*

| Depth, ft | What was logged there |
|---|---|
| 0–25 ft | **Concrete** 440 , **Brown Clay** 270 , **Tan Clay** 243 , **Topsoil** 241 , **Gray Shale** 222 , **Tan Limestone** 214 |
| 25–50 ft | **Gray Shale** 94 , **Austin Chalk** 37 , **Shale** 16 , **Gray Limestone** 16 , **Limestone** 11 , **Tan Clay** 11 |
| 50–100 ft | **Gray Shale** 107 , **Grey Shale** 6 , **Shale** 5 , **Austin Chalk** 5 , **Gray Clay** 4 , **Blue Shale** 4 |
| 100–200 ft | **Gray Shale** 65 , **Shale** 7 , **Black Clay** 2 , **Gray Clay** 2 , **Blue Clay** 2 , **Clay** 2 |
| 200–300 ft | **Gray Shale** 60 , **Sand** 32 , **Shale** 10 , **Black Soil** 5 , **Sandy Shale** 4 , **Rock** 4 |
| 300–500 ft | **Sand** 83 , **Gray Shale** 60 , **Shale** 20 , **Sandy Shale** 16 , **Gray Shale/Sand** 8 , **Sand Shale Sequence** 7 |
| 500–1000 ft | **Sand** 332 , **Gray Shale** 199 , **Shale** 144 , **Sand And Shale** 28 , **Sandy Gray Shale** 28 , **Broken Sand** 32 |
| 1000–5000 ft | **Sand** 117 , **Shale** 74 , **Gray Shale** 53 , **Sandy Shale** 26 , **Limestone** 15 , **Broken Sand** 12 |

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 Collin County

*Licensed firms in Collin County, busiest first.*

| Firm of record | Wells | Median depth, ft | Median yield, gpm | Years |
|---|---|---|---|---|
| [MagnaCore Drilling & Environmental Services](/driller/magnacore-drilling-environmental-services.md) | 468 | 10 | — | 2002–2016 |
| [WEST Drilling](/driller/west-drilling.md) | 389 | 15 | — | 2015–2025 |
| [Sunbelt Industrial Services](/driller/sunbelt-industrial-services.md) | 382 | 16 | — | 2006–2026 |
| [Environmental Logistics Company, LLC](/driller/environmental-logistics-company-llc.md) | 273 | 14 | — | 2016–2026 |
| [Earth Tech](/driller/earth-tech.md) | 242 | 860 | 25 | 2004–2020 |
| [Roddy Qualls Environmental Drilling](/driller/roddy-qualls-environmental-drilling.md) | 209 | 20 | — | 2014–2023 |
| [Total Support Services](/driller/total-support-services.md) | 204 | 15 | — | 2001–2017 |
| [Strata Core Services, LLC](/driller/strata-core-services-llc.md) | 163 | 18 | — | 2011–2020 |
| [W.E.S.T. Drilling](/driller/w-e-s-t-drilling.md) | 158 | 20 | — | 2001–2015 |
| [SCI](/driller/sci.md) | 106 | 20 | — | 2004–2013 |
| [Double D Drilling](/driller/double-d-drilling.md) | 96 | 900 | 24 | 2010–2026 |
| [Groundwater Monitoring Inc.](/driller/groundwater-monitoring-inc.md) | 95 | 18 | — | 2004–2008 |
| [RIOMAR ENVIRONMENTAL DRILLING](/driller/riomar-environmental-drilling.md) | 80 | 5 | — | 2011–2012 |
| [DIXIE DRILLING](/driller/dixie-drilling.md) | 71 | 12 | — | 2002–2005 |
| [Johnson Drilling, Inc.](/driller/johnson-drilling-inc.md) | 60 | 300 | 150 | 2002–2022 |
| [RIOMAR DRILLING INC](/driller/riomar-drilling-inc.md) | 60 | 14 | — | 2012–2020 |
| [Dierks Drilling Co.](/driller/dierks-drilling-co.md) | 58 | 65 | 4 | 2001–2014 |
| [Texplor of Dallas, Inc.](/driller/texplor-of-dallas-inc.md) | 57 | 20 | — | 2006–2022 |
| [Vortex Drilling, Inc.](/driller/vortex-drilling-inc.md) | 56 | 15 | — | 2007–2019 |
| [Savage Excavation](/driller/savage-excavation.md) | 54 | 20 | — | 2024–2026 |
| [A.L. Moser Drilling, Inc.](/driller/a-l-moser-drilling-inc.md) | 54 | 985 | 12 | 2003–2017 |
| [Barco Well Service, LP](/driller/barco-well-service-lp.md) | 50 | 1,120 | 50 | 2014–2025 |
| [Subterra Environmental Services, LLC.](/driller/subterra-environmental-services-llc.md) | 39 | 25 | — | 2016–2022 |
| [Strata Core Drilling Co.](/driller/strata-core-drilling-co.md) | 39 | 30 | — | 2008–2011 |
| [GM Enterprises](/driller/gm-enterprises.md) | 37 | 20 | — | 2002–2016 |

### What the wells are for

*Purpose, and how deep each went.*

| Purpose | Wells | Share | Median depth, ft |
|---|---|---|---|
| Monitor | 1,839 | 42.6% | 20 |
| Environmental Soil Boring | 1,482 | 34.3% | 10 |
| Irrigation | 437 | 10.1% | 880 |
| Closed-Loop Geothermal | 149 | 3.4% | 250 |
| Domestic | 125 | 2.9% | 900 |
| Stock | 101 | 2.3% | 1,000 |
| Test Well | 65 | 1.5% | 20 |
| Other | 59 | 1.4% | 20 |

*By decade drilled.*

| Decade | Reports | Median depth, ft | Water at, ft |
|---|---|---|---|
| 2000s | 1,420 | 20 | 450 |
| 2010s | 1,928 | 19 | 278 |
| 2020s | 973 | 20 | 430 |

### The deepest reports on file

*Deepest reports in Collin County. Column one is the tracking number.*

| Report | Year | Depth, ft | Water at, ft | Yield, gpm | Purpose |
|---|---|---|---|---|---|
| 712814 | 2025 | 3,560 | — | — | Public Supply |
| 25128 | 2003 | 3,200 | 505 | 1,160 | Irrigation |
| 252730 | 2008 | 3,105 | 600 | 403 | Public Supply |
| 685435 | 2024 | 2,850 | 600 | — | Public Supply |
| 202016 | 2003 | 2,730 | 568 | 300 | Irrigation |
| 638186 | 2023 | 2,530 | 846 | — | Public Supply |
| 95109 | 2006 | 2,490 | — | — | Public Supply |
| 554842 | 2020 | 2,450 | 789 | 380 | Public Supply |
| 715624 | 2025 | 2,400 | 850 | 180 | Irrigation |
| 349893 | 2013 | 2,350 | 881 | 430 | 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 Collin 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](/privacy.md).

### Counties with a comparable number of reports

- [Hays](/county/hays.md)
- [Williamson](/county/williamson.md)
- [Terry](/county/terry.md)
- [Hartley](/county/hartley.md)
- [Lavaca](/county/lavaca.md)
- [Washington](/county/washington.md)
- [Erath](/county/erath.md)
- [Harrison](/county/harrison.md)
- [DeWitt](/county/dewitt.md)
- [Hidalgo](/county/hidalgo.md)
- [Jefferson](/county/jefferson.md)
- [Llano](/county/llano.md)
- [Smith](/county/smith.md)

A sliding window, not a ranking. [Every county](/county.md).

---

Página: https://texas-water-wells.pages.dev/county/collin/
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