What Type of Water Well Is Best for a North Texas Property?
Quick Answer
A rotary-drilled cased well targeting the Trinity or Woodbine aquifer is right for any North Texas property. Depth and casing depend on county and formation.
North Texas geology makes the well type decision straightforward: rotary-drilled, fully cased, cement-grouted wells targeting a productive aquifer are the only appropriate choice. But within that category, the right well design — depth, casing diameter, aquifer target, pump sizing — varies significantly by county, formation, and intended use.
The Two Aquifer Targets in North Texas
Every residential or agricultural well in North Texas targets one of two primary aquifer systems:
| Aquifer | Counties | Typical Depth | Formation Character | Typical Yield |
|---|---|---|---|---|
| Woodbine | Collin, Hunt, Kaufman, Rockwall, eastern Denton County | 100–300 ft | Sandy; easier to drill | 5–20 GPM |
| Trinity (Paluxy/Glen Rose/Twin Mountains) | Wise, Cooke, Parker, Hood, Erath, Johnson, Ellis, Denton, Tarrant, Grayson | 200–700 ft | Interbedded sand and limestone; harder drilling | 3–15 GPM |
The Woodbine aquifer’s sandy character makes it faster and cheaper to drill. Trinity aquifer wells in western counties require slow rotary drilling through hard limestone — longer rig time, more bit wear, higher cost per foot.
Matching Well Design to Your Property
Residential Domestic Supply
A household well in North Texas is typically designed for 2–5 GPM continuous yield — enough for indoor plumbing, outdoor hose bibs, and a small garden. Standard design:
- Casing: 4-inch PVC or steel
- Pump: 3.5-inch submersible, ½–1 HP
- Pressure tank: 20–44 gallon
- Target yield: 3–10 GPM
This covers households of 2–6 people with typical water use.
Rural Property with Irrigation
Irrigation demands are much higher — a single sprinkler zone can require 10–20 GPM. For a property combining domestic and irrigation use:
- Casing: 6-inch PVC or steel
- Pump: 4-inch submersible, 1.5–3 HP
- Pressure tank: 44–86 gallon, or a larger atmospheric storage tank
- Target yield: 10–30 GPM
A storage tank (500–2,000 gallons) allows a lower-yield well to fill storage overnight for daytime irrigation peaks.
Agricultural and Livestock Supply
Livestock water is relatively modest — cattle drink roughly 30–50 gallons/day per head. A 50-head operation needs roughly 2,500 gallons/day, which a 2 GPM pump can supply. Larger operations benefit from:
- Dedicated agricultural wells with larger pumps
- Surface storage tanks to accumulate overnight fill
- Separate meter/pressure system from the domestic supply
Commercial and Industrial
Commercial wells serving businesses, rural hospitality operations, or food production require a more detailed yield analysis. Texas Water Code Section 36.117 sets a statewide default exemption of 25,000 gallons per day, but a local Groundwater Conservation District can adopt a stricter capacity test — commonly a pump rate around 17.36 gpm — that determines whether a well is exempt in its county. Commercial wells should be permitted and designed in consultation with the relevant GCD.
The Formation Makes the Design
In counties with hard limestone, design decisions shift:
Parker, Hood, Erath, Palo Pinto: Slow drilling through limestone requires heavier rotary equipment. Wells here are often designed with a longer open-hole section through the productive limestone zone, with no screen needed — the naturally fractured rock produces water directly into the casing. A sand trap or centrifugal separator at the wellhead helps if fine rock particles enter during pump-down.
Collin, Hunt, Kaufman: Sandy Woodbine formations require a well screen at the bottom of the casing to allow water in while keeping sand out. Screen slot size is matched to the grain size of the formation — too coarse and sand enters; too fine and flow is restricted.
How to Get the Right Well Design
The best path to a well designed for your property:
- Know your county and address — your driller will pull TWDB well logs from nearby properties to understand the local formation and productive depth range
- Know your water use — daily gallons needed for household, irrigation, and livestock combined
- Have access assessed — the drill rig needs 10–14 feet of overhead clearance and stable ground within 100 feet of the well location
- Get a written scope — a reputable driller provides a written description of target aquifer, estimated depth, casing diameter, pump size, and pressure system before you commit
DFW Well Service provides free site assessments and written estimates for properties throughout the 19-county North Texas service area. Call (940) 536-8560 to schedule.