texas-water-wells

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.

1,222Reports
310 ftMedian depth
115 ftWater at
25 gpmMedian yield

What you will drill through in Starr County

Logged in Starr County, by depth. The figure is how many wells hit it.
Depth, ftWhat was logged there
0–25 ftCaliche 245, Top Soil 225, Clay 216, Surface Sand 105, Caliche White 88, Soil Brown 68
25–50 ftClay 86, Sand 41, Clay Yellow 18, Shale 19, Gravel 17, Firm Sand 16
50–100 ftClay 129, Sand 67, Shale 26, Red Clay 23, Pea Gravel 21, Clay Yellow 20
100–200 ftClay 189, Sand 101, Shale 47, Clay Yellow 28, Clay With Sand 25, Red Clay 23
200–300 ftSand 148, Clay 146, Shale 55, Sand Brown 39, Clay Yellow 21, Clay W/ Sand 23
300–500 ftSand 220, Clay 155, Shale 67, Clay With Sand 36, Sand/Clay 25, Sand Brown 17
500–1000 ftSand 57, Clay 37, Hard Sand 5, Gray Sand 3, Shale 8, Brown Clay 5
1000–5000 ftSand 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 recordWellsMedian depth, ftMedian yield, gpmYears
Killinger's Water Well Drilling214445252003–2026
EnviroCore, Inc.18830—2009–2023
MARAL DRILLING149420252003–2026
R. MOLINA WATER WELL SERVICE, INC.122440252003–2019
Vortex Drilling, Inc.7615—2007–2017
Cinco E Inc.62460202001–2019
Vortex Drilling Partners, LP3315—2020–2022
BEST DRILLING SERVICES, INC.3335—2010–2012
SCI33——2010
Envirotech Drilling Services LLC2920—2018–2021
JEDI Drilling Contractors29110—2005–2019
Alpine Field Services2320—2005
T Molina Water Well LLC17460202012–2024
BELL WATER WELL SERVICE17380402011–2023
Geoprojects International, Inc.1620—2005–2006
R. Molina Water Well Serv., Inc.14500302005–2010
Front Range Drilling, Inc.1320—2011–2015
T. Molina Waterwell LLC12400202009–2014
Pursley Drilling Ltd.12420502004–2010
Alamo1 Drilling920—2025–2026
Mike-N-Sons All-Terrain Well & Pump Service9300282022–2025
BELL WATERWELL SERVICE7494502009–2014
ECI715—2008
WALKER HILL ENVIRONMENTAL INC6130—2018–2019
PAGE WATERWELL6640752008–2009

What the wells are for

Purpose, and how deep each went.
PurposeWellsShareMedian depth, ft
Stock33927.7%440
Environmental Soil Boring27322.3%16
Monitor26621.8%40
Domestic24720.2%450
Irrigation494.0%300
Rig Supply211.7%600
Industrial141.1%540
Test Well90.7%30
By decade drilled.
DecadeReportsMedian depth, ftWater at, ft
2000s409123107
2010s543320122
2020s270360114

The deepest reports on file

Deepest reports in Starr County. Column one is the tracking number.
ReportYearDepth, ftWater at, ftYield, gpmPurpose
6862520031,32015020Domestic
58803220211,200——Stock
30492520121,00027810Domestic
19703620071,0006025Domestic
4965720031,0009050Domestic
35897620149603078Stock
25931220119604605Domestic
701023202592030015Stock
2379020039001210Domestic
338247201384515530Domestic

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.

Counties with a comparable number of reports

A sliding window, not a ranking. Every county.