How Many Acres Do You Need for a Water Well in Parker County?

Water Well Drilling Weatherford checks lots for well eligibility before anyone signs a contract. The question we hear most is some version of how many acres do I need for a well? The honest answer is now two numbers: a minimum tract size, and whether a compliant well site actually fits on it.

The rule today (through December 31, 2026)

The Upper Trinity Groundwater Conservation District requires:

• Tract size: at least 2 acres.
• From property lines: at least 50 ft.
• From other registered wells: at least 150 ft.

The rule from January 1, 2027

The district adopted new rules on August 27, 2026:

• 5-acre minimum for property subdivided after December 31, 2026, where the Trinity aquifer is 60 ft thick or less. That’s mostly the western parts of Wise, Parker, Hood and Montague counties. Plats already in process are grandfathered.
• Spacing for wells producing 8–17.36 gallons per minute, a class that covers many household wells: 100 ft from property lines and 300 ft from other wells.
• Wells over 150 gpm (a new class): 4,000 ft from other wells and 1,250 ft from property lines.

District general manager Doug Shaw put the reason plainly: “There’s more wells drilled in Parker County than anywhere in the state — anywhere in the country.” State driller reports back it up. Parker County logged 1,287 new household wells in 2022 alone.

Why spacing now matters more than acreage

Picture a square 2-acre lot: roughly 295 ft on a side. Under the 2027 spacing, a household-class well must sit 100 ft from every property line. That leaves a square about 95 ft on a side in the middle. The septic system also needs room: 50 ft from the tank and 100 ft from the drain field. Then the well has to be 300 ft from every other well, including your neighbors’. On a street of 2-acre lots with wells already drilled, a compliant site may not exist.

A 5-acre square is about 467 ft on a side. The same 100-ft setbacks leave about 267 ft of usable width, enough room for a house, septic and well in most layouts.

What to do before buying

1. Check the tract on the district’s interactive tract-size map to see which minimum applies.
2. Find the registered wells on and around the lot. The district and the state driller-report database both help.
3. Sketch the house, septic and well with every setback drawn in.
4. Ask whether the plat was in process before December 31, 2026, if you’re buying in a new subdivision.

We do this as part of a lot review. Print our land buyer water well checklist to take to the showing, and see Parker County water well permit and residential well drilling.