Texas Water Rights 101 for Hill Country Landowners: What You Own, What You Don't
- Dustin Gass
- Aug 18
- 6 min read
Every landowner thinking about a stock tank eventually asks the same question: do I actually own the water on my property? In Texas, the answer isn't a simple yes.
Texas water rights for a landowner depend on where the water is — rain sheeting across your pasture belongs to you, but the moment it reaches a defined creek or draw, ownership shifts to the state.
This isn't legal advice, and nothing here replaces a conversation with a water rights attorney for anything property-specific — but it's the plain-language starting point Dustin Gass gives Texas Hill Country clients before he ever puts an excavator on site.
Table of Contents
Diffused Surface Water vs. State Water — The Line That Matters
Texas law splits surface water into two categories, and which one applies to your property determines what you're allowed to do with it, permit-free.
Diffused Surface Water: What Falls on Your Land
Rain that falls on your property and runs across the ground in no defined pattern — before it reaches a creek, draw, or other watercourse — is diffused surface water, and it belongs to you. You can capture it, dam it, or direct it into a stock tank without state permission, as long as it hasn't yet reached a recognized watercourse.
State Water: Once It Reaches a Watercourse, It's Not Yours Anymore
Once water flows into a watercourse — defined under Texas law as a drainage way with recognizable banks and a bed capable of carrying water — it becomes state water, even if that watercourse only runs after a heavy rain. This is the distinction that trips up landowners who assume anything on their property is automatically theirs.
A dry, intermittent creek bed common across Comal and Blanco County ranches can still count as a watercourse under state law.
The 200-Acre-Foot Stock Tank Exemption — What It Actually Covers
This is the exemption almost every Texas Hill Country pond conversation eventually lands on, and it's worth understanding exactly what it does and doesn't cover under Texas surface water law for a ranch pond.
What Qualifies: Domestic, Livestock, Wildlife
Under Texas Water Code §11.142, a landowner can build a dam or reservoir storing up to 200 acre-feet of water for domestic use, livestock, or fish and wildlife purposes — including a hunting pond — without a state permit. A 12-month rolling average at or under that threshold is what matters, so brief overages after a big rain aren't automatically a problem.
Most Texas Hill Country stock tanks, ranch ponds, and farm ponds (the terms are interchangeable in Texas) fall well under 200 acre-feet.
What Doesn't: Commercial Use and Watercourse Dams
The exemption excludes commercial operations like fish farming, and it doesn't remove the need to think carefully about damming a recognized watercourse rather than an unpatterned drainage draw — that's where dam safety review and downstream impact start to matter.
Bigger reservoirs, water sold or used commercially, or structures that impound a real creek can trigger TCEQ involvement regardless of size.
Can I Build a Pond on My Property in Texas?
For most Texas Hill Country landowners digging a stock tank for cattle, wildlife, or a swimming hole, the answer is yes — without a state permit — as long as the pond stays inside the exemption above.
When You Don't Need a Permit
If the pond is on your own land, under 200 acre-feet, used for domestic, livestock, or wildlife purposes, and built by capturing diffused surface water or a modest drainage draw, you're almost always exempt from a state water rights permit. That covers the overwhelming majority of stock tanks LandPrep.com builds across the Texas Hill Country.
When You Do — Watercourses, Dam Safety, and Downstream Neighbors
Damming a true watercourse, exceeding 200 acre-feet, planning any commercial use, or building a dam tall enough to trigger TCEQ's dam safety criteria all change the picture. So does a downstream neighbor whose property floods or dries up because of what got built upstream — permit-exempt doesn't mean liability-exempt.
Texas Hill Country water rights questions get more complicated fast once a watercourse or a neighbor's water supply is involved, which is exactly when an attorney should get a call before dirt moves.
What Comal, Kendall, and Blanco County Landowners Should Know Before Digging
Surface water law is only half the picture. Groundwater and local geology add two more layers Texas Hill Country landowners need before breaking ground.
Groundwater Districts and Well Exemptions
Groundwater beneath your property is privately owned but regulated locally — Comal, Kendall, and Blanco counties each fall under their own groundwater conservation district, and wells for domestic or livestock use under 25,000 gallons a day are typically exempt from district permitting. That's a separate system from surface water law, and it matters if a well feeds the same property as a planned pond.
Site Selection Still Matters More Than Paperwork
Being permit-exempt doesn't mean any spot on the property works. Edwards Plateau limestone seeps, and a pond sited on the wrong geology can lose water faster than rain fills it back up — clay content and bentonite sealing matter as much as the legal exemption does.
Dustin Gass has walked enough Texas Hill Country sites to know that the legal question and the engineering question have to get answered together, not separately.
LandPrep.com serves Comal, Kendall, Blanco, and surrounding counties — Contact Dustin to receive a FREE site visit and pond estimate before you dig.
You don't have to be a water law expert — you just need to hire a builder who understands where the legal line sits before the excavator shows up.
Ask any contractor:
Does this pond stay under the 200-acre-foot exemption, and how did you calculate that?
Is this a diffused drainage draw or a real watercourse, and does that change what's allowed?
Have you checked the local groundwater district rules, or just the surface water side?
If they don't have clear answers, hire someone else.
Frequently Asked Questions: Texas Water Rights and Stock Tanks
Do I own the water on my property in Texas?
It depends on where the water is. Rain that falls and runs across your land before reaching a defined creek or draw (diffused surface water) is yours to use. Once it flows into a recognized watercourse, it legally becomes state water, even on intermittent Texas Hill Country creeks that only run after rain.
Do I need a permit to build a stock tank in Texas?
Most landowners don't. Texas Water Code §11.142 exempts ponds up to 200 acre-feet used for domestic, livestock, or wildlife purposes from state permitting. Commercial use, larger reservoirs, or damming a true watercourse can change that — confirm your specific situation before digging.
What's the difference between a stock tank, ranch pond, and farm pond?
Nothing legally — the terms are used interchangeably across Texas for a landowner-built water impoundment. What matters legally is size, water source, and use, not what the pond is called.
Can my neighbor stop me from building a pond?
Being exempt from a state permit doesn't eliminate liability if your pond floods a neighbor's property or cuts off water they were relying on downstream. Site selection and drainage planning matter as much as the exemption itself — this is a good area to loop in an attorney if a neighboring property is close.
Does the 200-acre-foot limit apply to how much water I use, or how big the pond is?
It's a storage limit — how much water the reservoir holds, averaged over a 12-month rolling period. A pond sized correctly for a Texas Hill Country property rarely comes close to that ceiling.
