Texas well grid 87-20
A 7.5-minute quadrangle of the Texas state well grid, mostly in Starr County. 110 reports, median depth 375 ft.
110Reports
375 ftMedian depth
140 ftWater at
25 gpmMedian yield
What you will drill through in grid 87-20
| Depth, ft | What was logged there |
|---|---|
| 0–25 ft | Caliche 37, Top Soil 28, Ft Sand, Brown To Light Brown , Very Fine-Grained, Unconsoli 10, Ft Sand Brown To Light Brown, Very Fine-Grained, Unconsolida 10, Ft Sand Orangish-Brown, Very Fine-Grained, Unconsolidated, D 10, Clay 9 |
| 25–50 ft | Clay 12, Red Clay 3, Clay; Tan 3, Sandy Clay; Tan 3, Sandy Clay; Brown 3, Sand 2 |
| 50–100 ft | Clay 10, Sand 8, Shale 4, Brown Clay 3, Red Clay 3, Clay; Tan 3 |
| 100–200 ft | Clay 19, Sand 9, Hard Sand 3, Red Clay 3, Shale 2, Sand/Shale 2 |
| 200–300 ft | Sand 20, Clay 12, Shale 8, Fine Sand 3, Sand With Clay 2, Clay With Sand 2 |
| 300–500 ft | Sand 24, Clay 8, Shale 5, Brown Sand 4, Sand Brown 3, Sand/Clay 4 |
| 500–1000 ft | Sand 2, Clay 2, Sand Clay 1, Sand/Shale 1, Hard Sand 1 |
Who drills here
| Firm of record | Wells | Median depth, ft | Median yield, gpm | Years |
|---|---|---|---|---|
| Alpine Field Services | 23 | 20 | — | 2005 |
| Killinger's Water Well Drilling | 17 | 430 | 30 | 2008–2023 |
| MARAL DRILLING | 14 | 360 | 25 | 2004–2024 |
| EnviroCore, Inc. | 14 | 80 | — | 2009–2019 |
| SCI | 11 | — | — | 2010 |
| Cinco E Inc. | 7 | 460 | 17 | 2003–2018 |
| R. MOLINA WATER WELL SERVICE, INC. | 6 | 440 | 20 | 2008–2019 |
| T. Molina Waterwell LLC | 5 | 400 | 20 | 2009–2013 |
| T Molina Water Well LLC | 4 | 460 | 15 | 2015–2024 |
| Pursley Drilling Ltd. | 3 | 400 | 50 | 2007–2010 |
| Mike-N-Sons All-Terrain Well & Pump Service | 2 | 420 | 25 | 2023–2025 |
| JEDI Drilling Contractors | 2 | 80 | — | 2009 |
| Jose L Alvarado Drilling | 1 | 160 | — | 2026 |
| J4 Water Works, LLC | 1 | 720 | 105 | 2025 |
What the wells are for
| Purpose | Wells | Share | Median depth, ft |
|---|---|---|---|
| Environmental Soil Boring | 34 | 30.9% | 20 |
| Stock | 33 | 30.0% | 420 |
| Domestic | 24 | 21.8% | 420 |
| Monitor | 16 | 14.5% | 80 |
| Other | 2 | 1.8% | 460 |
| Irrigation | 1 | 0.9% | 440 |
| Decade | Reports | Median depth, ft | Water at, ft |
|---|---|---|---|
| 2000s | 40 | 20 | 110 |
| 2010s | 52 | 400 | 140 |
| 2020s | 18 | 420 | 130 |
The deepest reports on file
| Report | Year | Depth, ft | Water at, ft | Yield, gpm | Purpose |
|---|---|---|---|---|---|
| 692573 | 2025 | 720 | 123 | 105 | Stock |
| 437439 | 2016 | 590 | 140 | 20 | Domestic |
| 325318 | 2013 | 580 | 122 | 20 | Domestic |
| 584920 | 2021 | 550 | 148 | 50 | Stock |
| 452993 | 2017 | 540 | 200 | 18 | Stock |
| 78668 | 2004 | 540 | 30 | — | Domestic |
| 645149 | 2023 | 525 | 167 | — | Domestic |
| 645142 | 2023 | 505 | — | 40 | Domestic |
| 488646 | 2018 | 500 | 160 | 17 | Stock |
| 469670 | 2018 | 490 | 100 | 25 | Stock |
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 87-20?
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.
This grid falls in Starr County.