The Rule of Capture in Texas
Texas follows the "rule of capture" for groundwater ownership, which holds that a landowner owns the water beneath their property and may pump it freely — subject to regulation. This is a strong property right and has been confirmed by the Texas Supreme Court as a vested property interest.
Under the rule of capture, a landowner in Blanco County can drill a well and pump the groundwater beneath their land without needing permission from adjacent landowners, even if their pumping draws down water from formations shared with neighbors. This distinguishes Texas groundwater law from many other states that follow prior appropriation or correlative rights doctrines.
Regulation by the Headwaters GCD
While landowners own their groundwater, that ownership right is subject to regulation by the Headwaters Groundwater Conservation District (HGCD). The GCD has authority to:
- Require permits for new water wells (especially commercial and agricultural wells above a certain capacity)
- Set spacing requirements that limit how close wells can be to property lines or other wells
- Establish production limits on high-capacity wells to protect the aquifer
- Require registration of exempt domestic wells
Most single-family residential wells in Blanco County fall under an exemption from full permitting requirements, but they must still be registered with the GCD. Wells intended for agricultural use, commercial use, or that will pump above a certain volume per day may require a full permit application and review.
Groundwater vs. Surface Water — an Important Distinction
Groundwater ownership under the rule of capture does not extend to surface water. Water in the Blanco River, Pedernales River, creek systems, and stock tanks fed by surface runoff is governed by Texas water rights law, which follows the prior appropriation doctrine for surface water. Using surface water for irrigation or significant livestock watering typically requires a water right permit from the Texas Commission on Environmental Quality (TCEQ).
Many Hill Country landowners believe they own the water in their creeks and stock ponds — this is not always accurate under Texas law. For properties where surface water is a significant part of the appeal (spring-fed creeks, natural tanks), verifying the legal water rights status is an important part of due diligence.
What This Means for Buyers
For most residential and light agricultural buyers in Blanco County, the groundwater ownership picture is straightforward: you own the groundwater, you can drill a well and use it for household and livestock purposes, and the GCD's regulatory framework is designed primarily to protect the aquifer from large-scale overdraft rather than to restrict normal rural use.
