Water Diversion and Section 11.086 of the Texas Water Code: What Landowners Should Know

The statute that decides who pays when a neighbor’s grading, driveway, or new construction sends water onto your land.

The water was never a problem for twenty-five years. Then someone changed the land next door. A neighbor built a wall, poured a slab, or raised a driveway. A builder cleared and regraded the tract next door for a new subdivision, a commercial pad site, or the next phase of an existing development. Now every hard rain pushes water where it never went before. It pools against a foundation, cuts a gully across a yard, floods a shop, or undermines a wall. By the time most owners call a lawyer, the damage is done and the other side is already blaming the weather.

Here is the practical lesson, stated up front. Texas gives you a specific statutory claim for exactly this situation, and it does not require you to prove the other party was careless. Section 11.086 of the Texas Water Code makes it unlawful to divert or impound surface water in a way that damages someone else’s property. If you can prove the diversion and the resulting damage, liability follows. The hard part is almost never the law. It is proving that the water was “surface water” and that the man-made change caused your loss. That is where these cases are won and lost.

The rule in plain English

Section 11.086(a) says that “[n]o person may divert or impound the natural flow of surface waters in this state, or permit a diversion or impounding by him to continue, in a manner that damages the property of another by the overflow of the water diverted or impounded.” Subsection (b) then gives the injured owner “remedies at law and in equity” and the right to “recover damages occasioned by the overflow.”

Texas courts break that language into three elements: a diversion or impoundment of surface water, which causes, damage to the property of the plaintiff landowner. The Texas Supreme Court set that framework in Kraft v. Langford, 565 S.W.2d 223 (Tex. 1978), and the courts of appeals have applied it consistently since. You will see it stated the same way in Contreras v. Bennett, 361 S.W.3d 174 (Tex. App.-El Paso 2011, no pet.), and Golden Corral Corp. v. Noble Austin Apartments, L.L.C., No. 03-19-00463-CV (Tex. App.-Austin July 9, 2021, no pet.) (mem. op.).

The point that surprises most clients is that negligence is not part of the claim. A Section 11.086 violation “is not dependent upon a finding of negligence.” Tex. Woman’s Univ. v. Methodist Hosp., 221 S.W.3d 267, 283 (Tex. App.-Houston [1st Dist.] 2006, no pet.). In Contreras, the jury actually found the plaintiffs 55 percent negligent, which barred their negligence claim entirely under comparative fault. Their Water Code recovery survived anyway, because the statute imposes liability without regard to fault. That is a powerful feature for a damaged landowner, and it is the first reason to plead the statute rather than relying on ordinary negligence.

Note that the statute reaches impoundment as well as diversion, and it has deep roots. In Burbridge v. Rich Properties, Inc., 365 S.W.2d 657 (Tex. Civ. App.-Houston 1963, no writ), decided under the predecessor statute, water was allowed to accumulate on the defendants’ property and then seeped into the adjoining building. The court affirmed both damages and an injunction, and read the word “overflow” broadly, to include not just water flowing over a brim but water that spreads over, covers, or inundates a neighbor’s land. As the court put it, a landowner has “no natural right, by means of any building or other structure placed on his land, to discharge on adjoining premises the water which may accumulate from natural causes.” Holding water back so that it backs up onto your neighbor can violate the statute just as surely as channeling it toward him.

“Surface water” is a defined term, and it can decide your case

The statute protects against the diversion of “surface waters.” That phrase is not defined in the Water Code, so the courts supplied a definition: water “diffused over the ground from falling rains or melting snows” that “continues to be such until it reaches some bed or channel in which water is accustomed to flow.” Tex. Woman’s Univ., 221 S.W.3d at 277. Once water enters a natural watercourse with a bank, a bed, a current, and a permanent source of supply, it stops being surface water.

That line matters because the State, not private owners, holds the duty to control floodwaters. If your damage came from floodwater that overflowed a creek or bayou, Section 11.086 does not reach it. If it came from diffuse rain runoff that a neighbor redirected before it ever reached a watercourse, the statute applies. Courts police this distinction carefully. Texas Woman’s University addressed a related move, the argument that runoff crossing a large “watershed” was floodwater the State had to manage. The court rejected it, explaining that a watershed is not itself a watercourse. If it were, rain would lose its character as surface water the instant it hit any piece of ground, and the statute would mean nothing.

Man-made changes do not automatically convert surface water into something else

Defendants often argue that once water is graded, bermed, or run through a swale, it is no longer “surface water” and the statute cannot apply. Texas Woman’s University rejected the broad version of that argument, holding that surface water does not lose its protected character simply because it has been “touched by the hands of man.” Reading the statute that way would gut it, because every diversion claim by definition involves water moved by human conduct.

The Austin court sharpened the timing rule in Golden Corral. A restaurant’s parking lot, rain gardens, and swale collected runoff and sent it onto an adjoining apartment complex. The defendant argued that the water lost its “surface water” status once it entered the rain gardens. The court held that the water only needs to be surface water at the moment of the diversion or impoundment. It does not have to remain surface water when it later overflows and does the damage. That reading follows the statute, which imposes liability for damage from “the overflow of the water diverted or impounded,” without requiring the overflow itself to still qualify as surface water.

The mirror image also matters. Where water has already gathered into a defined channel before the defendant touches it, there is no surface water diversion. That is the narrow holding of Dietrich v. Goodman, 123 S.W.3d 413 (Tex. App.-Houston [14th Dist.] 2003, no pet.), which both Golden Corral and Texas Woman’s University discuss: a landowner has no Section 11.086 claim for damage from water that was already flowing in a watercourse, such as a natural gully, when it was diverted.

Water runs downhill, and so does the legal duty

Texas follows the civil-law rule for surface water between higher and lower tracts. The lower estate must accept the surface water that naturally flows down from the higher estate. What the lower owner does not have to accept is water that has been collected, concentrated, or redirected by human alteration of the upper tract. As the Texas Supreme Court put it long ago, the lower estate must receive surface waters “in their natural condition, untouched by the hands of man.” Bunch v. Thomas, 121 Tex. 225, 49 S.W.2d 421, 423 (1932).

Muniz v. Dugi, No. 04-20-00528-CV (Tex. App.-San Antonio May 11, 2022, no pet.) (mem. op.), is a clean illustration from the Medina Lake area. The uphill owners built a home and driveway that raised and regraded their lot. Before the construction, water from the upper lots did not flow onto the lower property. After it, water channeled straight off the new driveway into the neighbor’s shop. The court affirmed liability, explaining that the lower estate is not required to receive water “except in their natural condition, untouched by the hands of man,” and that the uphill owners had a responsibility to stop the unnatural flow their construction created.

Clearing and regrading a large tract changes where the water goes

This is not only a backyard problem, and the rule does not shrink because the project is large. When a builder or developer clears and regrades a neighboring tract, whether for a new subdivision, a commercial pad site, or the next phase of an existing development, the grading almost always changes the drainage. Stripping vegetation and reshaping the ground removes the natural absorption and detention that raw land provided, then concentrates the runoff and sends it toward whatever lies downhill. Golden Corral is that case in a commercial setting: the site was graded, a concrete parking lot and drainage features were added, and the concentrated flow ended up on the apartment complex next door. Muniz shows the same thing at the scale of a single new home. Owners next to active construction, a new phase, or freshly cleared acreage should watch their drainage closely, because the tract that used to hold water may not hold it anymore.

The through-line is simple. In Contreras, a neighbor added a concrete slab and walls that stopped water from pooling on his own lot and forced it downhill onto the Bennetts, destroying their wall. In Golden Corral, a graded commercial site concentrated runoff and released it onto the property next door. You may not reengineer your land, on any scale, to unload your water problem onto the property below you.

Causation: the “but for” problem

Strict liability does not mean automatic liability. The plaintiff still has to prove that the unlawful diversion caused the damage, and specifically that the damage “would not have resulted but for such unlawful diversion.” Contreras, 361 S.W.3d at 178. This is where defendants live. In almost every one of these cases, the defense theory is that the same rain would have caused the same damage even without the wall, the slab, or the grading.

Contreras shows how a plaintiff meets that burden and how thin the margin can be. The defense pressed the point that the plaintiffs’ aging rock wall might have failed in the storm regardless. The court held that Texas recognizes more than one proximate cause, and that the diversion needs to be a substantial factor in the damage, not the sole cause. The engineering testimony that the man-made changes concentrated and accelerated the flow was enough to support the verdict, even though parts of that testimony were contradictory. The lesson is that causation is a factual fight that turns on credible expert work, not on a legal presumption.

Related claims that travel with a diversion case

Surface water disputes rarely arrive as a single cause of action. The same facts often support negligence, private nuisance, and sometimes trespass, and each theory carries its own elements, defenses, and remedies.

Texas Woman’s University is the map. The court allowed the Section 11.086 claim, the negligence claim, and the nuisance claim to proceed, but affirmed dismissal of the trespass claim because trespass requires intent, and there was no evidence the defendant intended or was substantially certain that water would invade the plaintiff’s property. Polley v. Simoni, No. 05-24-00411-CV (Tex. App.-Dallas Aug. 19, 2025, no pet. h.) (mem. op.), shows how these theories ride together in practice. The plaintiff there pleaded private nuisance, trespass, and Section 11.086 on the same facts. Pleading in the alternative is good practice, because a fact pattern that looks like a clean diversion claim may prove more cleanly as nuisance or negligence, or the reverse.

What this means for Texas landowners

Section 11.086 is one of the most useful tools a Texas property owner has when someone else’s development, grading, or construction turns their land into a drainage basin. It does not require proof of fault, and it reaches developers and neighbors alike, from a single adjoining lot to a large tract being cleared for new construction. But the statute rewards preparation, not outrage. The owners who recover are the ones who can prove the water was surface water, trace it to a man-made change, and put on disciplined evidence of causation. The owners who lose usually had the better story and the weaker proof.

If water has started showing up where it never did before, treat it as a case from day one. Preserve the evidence, get an engineer, and get advice before you regrade the property or let a deadline pass. For more on Texas real estate and water law, visit SanAntonioRealEstateLawyer.com.