Water Well Drilling & Pump Repair in Millsap, TX | DFW Well Service
Service Area Overview
Licensed well drilling and pump service in Millsap, TX, working through Parker County's limestone to reach the Trinity's Paluxy and Twin Mountains sands.
Services We Provide in Millsap
DFW Well Service is a trusted partner for landowners in Millsap and the surrounding rural communities of western Parker County. Deep limestone wells are our specialty, and our heavy drilling rigs are well suited to the challenging formations found throughout this part of Texas.
Well Depth & Geology in Millsap Area
Tap any layer in the cube — or in the list below — to see what it is and what it means for drilling a well here.
- Topsoil — Cross Timbers Trinity outcrop0–20 ft
- Paluxy Formation20–350 ft
- Glen Rose Formation350–500 ft
- Twin Mountains Formation500–700 ft
This cross-section shows the layer stack typical of Parker County. The exact formations and depths under a specific Millsap-area property vary — see the details above.
- Primary Aquifer
- Trinity (Paluxy / Twin Mountains)
- Typical Well Depth
- 250–550 ft
- Groundwater District
- Upper Trinity GCD
- Confinement
- outcrop in central and western Parker County; confined beneath younger limestone in eastern Parker County
Parker County overview → Permit & regulations → TDLR License #61234 DKMPW Updated June 4, 2026
Wells around Millsap draw from the Trinity aquifer, but western Parker County near the Palo Pinto line is harder ground for groundwater than most of the county. The main target is the Paluxy sand — fine-grained sand with silt and clay that has historically supplied more water in Parker County than any other layer. Below it, the deeper Twin Mountains sand is the stronger producer when a well reaches it, though it isn’t always present at usable depth here. Between the two sits the Glen Rose Formation, mostly limestone that holds little water, so the well is cased through it rather than producing from it. On the far western edge of the county, where the Trinity thins out, some properties have to fall back on the deeper Cross Timbers and Paleozoic rock — older layers the district counts as a minor aquifer, usually with limited yield and more minerals in the water.
Parker County Permit Requirements
Well construction in Millsap falls under the authority of the Upper Trinity Groundwater Conservation District (UTGCD). A well permit from UTGCD is required before drilling begins, and the finished well must be constructed to TDLR standards including surface casing, annular grout seal, and a driller’s log submitted upon completion. Setback requirements from septic systems and property lines must also be met. Visit our guide to Parker County water well regulations for a full walkthrough of the permit process.
Ready to drill a well on your Millsap property? Call DFW Well Service at (940) 536-8560 for a free estimate. We know the local geology and can give you an honest picture of what depth and cost to expect before drilling begins.