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

> 1,222 well reports filed in Starr County since 2001. Median depth 310 ft, water struck at 115 ft, median yield 25 gpm.

## Water wells in Starr County, Texas

**1,222** well reports on file. The median well here was taken to **310 ft** and struck water at **115 ft** — against 180 ft and 80 ft across Texas.

### What you will drill through in Starr County

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

| Depth, ft | What was logged there |
|---|---|
| 0–25 ft | **Caliche** 245 , **Top Soil** 225 , **Clay** 216 , **Surface Sand** 105 , **Caliche White** 88 , **Soil Brown** 68 |
| 25–50 ft | **Clay** 86 , **Sand** 41 , **Clay Yellow** 18 , **Shale** 19 , **Gravel** 17 , **Firm Sand** 16 |
| 50–100 ft | **Clay** 129 , **Sand** 67 , **Shale** 26 , **Red Clay** 23 , **Pea Gravel** 21 , **Clay Yellow** 20 |
| 100–200 ft | **Clay** 189 , **Sand** 101 , **Shale** 47 , **Clay Yellow** 28 , **Clay With Sand** 25 , **Red Clay** 23 |
| 200–300 ft | **Sand** 148 , **Clay** 146 , **Shale** 55 , **Sand Brown** 39 , **Clay Yellow** 21 , **Clay W/ Sand** 23 |
| 300–500 ft | **Sand** 220 , **Clay** 155 , **Shale** 67 , **Clay With Sand** 36 , **Sand/Clay** 25 , **Sand Brown** 17 |
| 500–1000 ft | **Sand** 57 , **Clay** 37 , **Hard Sand** 5 , **Gray Sand** 3 , **Shale** 8 , **Brown Clay** 5 |
| 1000–5000 ft | **Sand** 2 , **Clay** 2 , **Clay W/ Sand** 1 |

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 Starr County

*Licensed firms in Starr County, busiest first.*

| Firm of record | Wells | Median depth, ft | Median yield, gpm | Years |
|---|---|---|---|---|
| [Killinger's Water Well Drilling](/driller/killinger-s-water-well-drilling.md) | 214 | 445 | 25 | 2003–2026 |
| [EnviroCore, Inc.](/driller/envirocore-inc.md) | 188 | 30 | — | 2009–2023 |
| [MARAL DRILLING](/driller/maral-drilling.md) | 149 | 420 | 25 | 2003–2026 |
| [R. MOLINA WATER WELL SERVICE, INC.](/driller/r-molina-water-well-service-inc.md) | 122 | 440 | 25 | 2003–2019 |
| [Vortex Drilling, Inc.](/driller/vortex-drilling-inc.md) | 76 | 15 | — | 2007–2017 |
| [Cinco E Inc.](/driller/cinco-e-inc.md) | 62 | 460 | 20 | 2001–2019 |
| [Vortex Drilling Partners, LP](/driller/vortex-drilling-partners-lp.md) | 33 | 15 | — | 2020–2022 |
| [BEST DRILLING SERVICES, INC.](/driller/best-drilling-services-inc.md) | 33 | 35 | — | 2010–2012 |
| [SCI](/driller/sci.md) | 33 | — | — | 2010 |
| [Envirotech Drilling Services LLC](/driller/envirotech-drilling-services-llc.md) | 29 | 20 | — | 2018–2021 |
| [JEDI Drilling Contractors](/driller/jedi-drilling-contractors.md) | 29 | 110 | — | 2005–2019 |
| [Alpine Field Services](/driller/alpine-field-services.md) | 23 | 20 | — | 2005 |
| [T Molina Water Well LLC](/driller/t-molina-water-well-llc.md) | 17 | 460 | 20 | 2012–2024 |
| [BELL WATER WELL SERVICE](/driller/bell-water-well-service.md) | 17 | 380 | 40 | 2011–2023 |
| [Geoprojects International, Inc.](/driller/geoprojects-international-inc.md) | 16 | 20 | — | 2005–2006 |
| [R. Molina Water Well Serv., Inc.](/driller/r-molina-water-well-serv-inc.md) | 14 | 500 | 30 | 2005–2010 |
| [Front Range Drilling, Inc.](/driller/front-range-drilling-inc.md) | 13 | 20 | — | 2011–2015 |
| T. Molina Waterwell LLC | 12 | 400 | 20 | 2009–2014 |
| [Pursley Drilling Ltd.](/driller/pursley-drilling-ltd.md) | 12 | 420 | 50 | 2004–2010 |
| [Alamo1 Drilling](/driller/alamo1-drilling.md) | 9 | 20 | — | 2025–2026 |
| Mike-N-Sons All-Terrain Well & Pump Service | 9 | 300 | 28 | 2022–2025 |
| BELL WATERWELL SERVICE | 7 | 494 | 50 | 2009–2014 |
| [ECI](/driller/eci.md) | 7 | 15 | — | 2008 |
| [WALKER HILL ENVIRONMENTAL INC](/driller/walker-hill-environmental-inc.md) | 6 | 130 | — | 2018–2019 |
| [PAGE WATERWELL](/driller/page-waterwell.md) | 6 | 640 | 75 | 2008–2009 |

### What the wells are for

*Purpose, and how deep each went.*

| Purpose | Wells | Share | Median depth, ft |
|---|---|---|---|
| Stock | 339 | 27.7% | 440 |
| Environmental Soil Boring | 273 | 22.3% | 16 |
| Monitor | 266 | 21.8% | 40 |
| Domestic | 247 | 20.2% | 450 |
| Irrigation | 49 | 4.0% | 300 |
| Rig Supply | 21 | 1.7% | 600 |
| Industrial | 14 | 1.1% | 540 |
| Test Well | 9 | 0.7% | 30 |

*By decade drilled.*

| Decade | Reports | Median depth, ft | Water at, ft |
|---|---|---|---|
| 2000s | 409 | 123 | 107 |
| 2010s | 543 | 320 | 122 |
| 2020s | 270 | 360 | 114 |

### The deepest reports on file

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

| Report | Year | Depth, ft | Water at, ft | Yield, gpm | Purpose |
|---|---|---|---|---|---|
| 68625 | 2003 | 1,320 | 150 | 20 | Domestic |
| 588032 | 2021 | 1,200 | — | — | Stock |
| 304925 | 2012 | 1,000 | 278 | 10 | Domestic |
| 197036 | 2007 | 1,000 | 60 | 25 | Domestic |
| 49657 | 2003 | 1,000 | 90 | 50 | Domestic |
| 358976 | 2014 | 960 | 307 | 8 | Stock |
| 259312 | 2011 | 960 | 460 | 5 | Domestic |
| 701023 | 2025 | 920 | 300 | 15 | Stock |
| 23790 | 2003 | 900 | 12 | 10 | Domestic |
| 338247 | 2013 | 845 | 155 | 30 | Domestic |

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 Starr 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

- [Bailey](/county/bailey.md)
- [Milam](/county/milam.md)
- [Refugio](/county/refugio.md)
- [Irion](/county/irion.md)
- [Kaufman](/county/kaufman.md)
- [Collingsworth](/county/collingsworth.md)
- [Lee](/county/lee.md)
- [Donley](/county/donley.md)
- [Concho](/county/concho.md)
- [Jones](/county/jones.md)
- [Brown](/county/brown.md)
- [Runnels](/county/runnels.md)
- [Bosque](/county/bosque.md)

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

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