Water wells in the Middle Trinity Groundwater Conservation District
Home water wells inside the Middle Trinity Groundwater Conservation District (Erath, Coryell, Bosque and Comanche counties, Texas) are typically 180 to 435 feet deep (median 360 ft, 2,775 wells drilled in the last 10 years). Nearly all (95%) draw from the Trinity, which the state maps here as one undivided unit, the Antlers Formation; by depth, roughly 11% fall in its upper part and 84% in its lower part, an approximate split. Over the last three full years drillers reported about 312 new home wells a year; the peak was 379 in 2022. Estimated cost of a complete well at the median depth: $11,500 to $28,000.
Updated every day from Texas Water Development Board driller reports. Last update: November 11, 2026, using the state file of November 10, 2026.
Under the center of the Middle Trinity GCD
District boundary from TWDB's file current as of November 2019. Later changes are not shown.
Digging in…
Home wells in and around the Middle Trinity GCD
Each dot is a home well from a state driller report, colored by depth. Tap one for its details and official report. Tap an empty spot to see what is under that point.
Well depth (ft)
- <100
- 100
- 200
- 300
- 400
- 600
- 800+
Dark line: the district boundary (TWDB, 2019)
Green: aquifer mapped by the state
Key figures
- Typical depth (middle half)
- 180 to 435 feet
- Median depth
- 360 feet
- Deepest 10% are past
- 555 feet
- Water level (median)
- 241 feet
- 2,094 wells
- Yield (median)
- 25 gpm
- 2,333 wells, gallons per minute
- Wells used
- 2,775
- In the last 10 years
- Counties
- 4
- All years on file
- 5,753
- median 354 ft, since 1975
- Confidence
- Standard (30 or more wells)
When the wells were finished, the water stood a median 241 feet below the surface (2,094 wells).
New home wells per year
Over the last three full years drillers reported about 312 new home wells a year; the peak was 379 in 2022.
Show the data table
| Year | Wells |
|---|---|
| 2002 | 48 |
| 2003 | 198 |
| 2004 | 298 |
| 2005 | 324 |
| 2006 | 316 |
| 2007 | 248 |
| 2008 | 238 |
| 2009 | 154 |
| 2010 | 166 |
| 2011 | 179 |
| 2012 | 149 |
| 2013 | 154 |
| 2014 | 182 |
| 2015 | 147 |
| 2016 | 159 |
| 2017 | 185 |
| 2018 | 200 |
| 2019 | 227 |
| 2020 | 279 |
| 2021 | 338 |
| 2022 | 379 |
| 2023 | 360 |
| 2024 | 309 |
| 2025 | 266 |
| 2026 | 208 |
Which formation the wells draw from
Nearly all (95%) draw from the Trinity, which the state maps here as one undivided unit, the Antlers Formation; by depth, roughly 11% fall in its upper part and 84% in its lower part, an approximate split.
| Layer (state's model) | Share | Wells | Typical depth (ft) |
|---|---|---|---|
| Lower TrinityTwin Mountains and Travis Peak | 84% | 2,277 | 220–450 |
| Upper TrinityPaluxy and Glen Rose | 11% | 298 | 140–260 |
| Near or below the base of the Trinity | 4% | 95 | 220–460 |
| Washita and Fredericksburg | 1% | 38 | 180–280 |
For 96% of these wells the report says where the water enters (the screen or the open hole), and we use the middle of that interval.
Places with the most wells in the district
| Place | Median depth (ft) | Middle half (ft) | Wells | Main layer |
|---|---|---|---|---|
| Stephenville | 400 | 390–427 | 200 | Lower Trinity (Twin Mountains and Travis Peak) |
| Comanche | 130 | 98–176 | 114 | Lower Trinity (Twin Mountains and Travis Peak) |
| Huckabay | 375 | 342–390 | 62 | Lower Trinity (Twin Mountains and Travis Peak) |
| De Leon | 100 | 90–111 | 59 | Lower Trinity (Twin Mountains and Travis Peak) |
| Dublin | 302 | 121–426 | 54 | Lower Trinity (Twin Mountains and Travis Peak) |
| Hico | 475 | 440–510 | 51 | Lower Trinity (Twin Mountains and Travis Peak) |
| Gorman | 94 | 80–118 | 44 | Lower Trinity (Twin Mountains and Travis Peak) |
| Kopperl | 210 | 180–274 | 42 | Upper Trinity (Paluxy and Glen Rose) |
| Iredell | 555 | 469–600 | 40 | Lower Trinity (Twin Mountains and Travis Peak) |
| Lingleville | 400 | 374–440 | 40 | Lower Trinity (Twin Mountains and Travis Peak) |
| Meridian | 400 | 155–725 | 39 | Upper Trinity (Paluxy and Glen Rose) |
| Evant | 420 | 375–498 | 35 | Lower Trinity (Twin Mountains and Travis Peak) |
Counties
Depth over time
Home well depth in the district has not changed meaningfully in 20 years: the median was 328 feet in 2003 to 2007 and 350 feet in 2021 to 2025 (a difference under 10% or within the margin of error).
| Period | Median depth (ft) | Wells |
|---|---|---|
| 2001–2005 | 295 | 905 |
| 2006–2010 | 350 | 1,122 |
| 2011–2015 | 370 | 811 |
| 2016–2020 | 375 | 1,050 |
| 2021–2025 | 350 | 1,652 |
| 2026 | 340 | 208 |
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Common questions
How deep are wells in the Middle Trinity GCD?
Home water wells inside the Middle Trinity Groundwater Conservation District (Erath, Coryell, Bosque and Comanche counties, Texas) are typically 180 to 435 feet deep (median 360 ft, 2,775 wells drilled in the last 10 years).
Which formation do wells in the district draw from?
Nearly all (95%) draw from the Trinity, which the state maps here as one undivided unit, the Antlers Formation; by depth, roughly 11% fall in its upper part and 84% in its lower part, an approximate split.
What does a groundwater conservation district do?
In Texas, districts are the local authority over groundwater: they can require registration or permits for new wells, set spacing from other wells and property lines, and limit pumping. Each district writes its own rules, so ask the Middle Trinity Groundwater Conservation District before drilling inside it.
What a well costs here
At the median depth for the district (360 feet), a complete home well would cost roughly $11,500 to $28,000: $25 to $60 per foot for drilling, casing and seal, plus $2,500 to $6,500 for the pump, pressure tank, controls and hookup at the well. Across the whole middle half of depths (180 to 435 feet) the range runs from $7,000 to $32,500. This is TerraFunded's estimate from published Texas prices, not a quote, and it leaves out trenching and the line to the house. Get prices from at least two licensed drillers.
How these numbers are made
We count new and replacement domestic (home) wells whose coordinates fall inside the district boundary. We use the last 10 years when there are at least 30 wells; otherwise all since 2001. The median is the middle well and the middle half runs from the 25th to the 75th percentile.
To tell which layer a well draws from, we take the ground elevation at its location, subtract the depth of the interval where water enters (or the bottom of the hole when the report does not give one) and see which layer of the state's model that point falls in.
For 96% of these wells the report says where the water enters (the screen or the open hole), and we use the middle of that interval.
How well it works: In 7,977 wells in the area of the state's Northern Trinity and Woodbine model (North and Central Texas) where the State of Texas recorded the aquifer, our estimate of the formation the well draws from names the same layer of the state's model in about 74% of them, and that layer or the one next to it in at least 95%; among the 3,130 of those wells that the state places in a Trinity layer (Paluxy to Hosston) it is about 56%.
- The layers come from the Texas Water Development Board's Northern Trinity and Woodbine model, with quarter mile cells, summarized here to about 1.3 miles. It is a regional model, not a survey of any lot: between one model point and the next, the real depth of each layer can differ.
- In this model every layer is at least 30 feet thick, even where the real rock is thinner or missing. Thin layers and the edges of the model are approximate.
- Inside the Trinity this atlas does not name single model layers: it groups the Paluxy and Glen Rose (upper Trinity) and groups the Hensell, Pearsall and Hosston (lower Trinity, Twin Mountains and Travis Peak), because the check against the state's codes shows the method cannot separate them reliably.
- In this area, north and west of Fort Worth, the state maps the Trinity as one undivided unit, the Antlers Formation. The model cuts it into layers by depth; the split between upper and lower Trinity shown here is approximate, and the depth ranges are the solid part.
- "Near or below the base of the Trinity" means the well reaches the bottom of the model or passes it, often by tens of feet. Older rock that the model does not include may lie there.
- We never use the model's water levels. The water level on this page is the one each driller measured when the well was finished.
These are depths of real wells drilled nearby, not a promise about any property. Groundwater can change over short distances and with drought. A licensed water well driller can tell you what to expect on a specific tract.
Read the full methodology · Download the data (CSV, CC BY 4.0)
How to cite
TerraFunded (2026). Texas Well Atlas: Underground. From Texas Water Development Board driller reports and groundwater availability models (data as of November 10, 2026). https://terrafunded.com/wells/districts/middle-trinity-groundwater-conservation-district. License CC BY 4.0. https://doi.org/10.5281/zenodo.24126380.
Sources
- Submitted Driller's Reports database, Texas Water Development Board (TWDB) (file of November 10, 2026)
- Hydrogeology and Documentation of the Northern Trinity and Woodbine Aquifer System Groundwater Availability Model (NTGAM). Ellis, J., Prieto-Estrada, A., Osborne, A., Deeds, N., White, J., and Keester, M. (INTERA Incorporated), for the North Texas Groundwater Conservation District and Groundwater Management Area 8, 2025, GAM v3.01. TWDB groundwater availability model.
- Groundwater conservation district boundaries, TWDB (current as of November 2019)
- Ground elevation: Terrain Tiles (Mapzen), Registry of Open Data on AWS
- TWDB well report viewer (each well's official report)