On South Texas land, water is usually the difference between a tract that works and one that does not. It is also the subject buyers most often assume they understand.
Groundwater: the rule of capture
Texas groundwater has historically followed the rule of capture — a landowner may pump water from beneath their own land, and is generally not liable to a neighbor whose well is affected. Groundwater is treated as belonging to the surface owner.
That is the starting point, not the whole picture. In practice the rule is heavily modified by groundwater conservation districts, which regulate spacing, permitted production volumes, well registration and metering. Most of our service area falls under one district or another, and their rules differ.
The practical question is never "does the rule of capture apply." It is "which district governs this tract, and what will it permit me to pump."
Surface water is a different animal
Surface water in Texas — rivers, streams, and the water in most creeks — is generally owned by the state and held in trust. Owning both banks does not confer the right to impound or divert it. Appropriative water rights are permitted through the TCEQ, and existing rights are senior to new ones.
There are exemptions, notably for domestic and livestock use, which is why stock tanks are common and generally uncontroversial. But a plan that involves meaningful diversion or a substantial impoundment needs a real answer before closing, not after.
Evaluating an existing well
Ask for, in writing:
- The well log. Filed with the Texas Water Development Board by the driller. It tells you depth, formation and construction.
- Total depth and static water level. The gap between them is your standing column.
- Tested production rate. Gallons per minute, ideally from a recent test rather than a recollection.
- Which aquifer it produces from. Edwards, Carrizo-Wilcox and Trinity behave very differently in terms of depth, quality and reliability.
- Casing condition and pump age. Pumps are consumable. Casing failures are expensive.
- A current water quality test. Bacteria, nitrates, total dissolved solids. Some areas produce hard or high-sulfur water that is drinkable but unpleasant without treatment.
If there is no well
Get a real estimate before you commit, not a rule of thumb. Cost scales with depth, and depth varies enormously across even a single county. Ask a local driller what they are hitting water at in that specific area — they know, and they will tell you. Then confirm the district's permitting and spacing requirements.
Distribution matters as much as supply
On grazing and recreational land, a single well at the headquarters with no distribution is much less useful than the same well feeding troughs spread across the tract. Pipeline, storage and solar pumping are all standard now, and existing infrastructure carries real value.
General information, not legal advice. Water law is genuinely complicated — consult a water law attorney for anything consequential.