Irrigation Leak Detection and Repair in Round Rock, TX
An irrigation leak is almost entirely underground, so the first clue is usually the water bill or a zone that never quite reaches pressure. The system has to be tested zone by zone to find where the water is going.
What the underground system looks like
An irrigation system starts at the backflow preventer, which ties to the mainline running from the meter. From there the mainline feeds a manifold of zone valves, each controlling a buried lateral that fans out to the heads in its zone. A leak can sit anywhere along that path: at the backflow preventer, at a zone valve, in a buried lateral run, or at the connection where a lateral joins the mainline. The surface gives almost no clue about which one, which is why systematic pressure testing is the only reliable way in.
Round Rock's 1998 reuse water program irrigates many of its parks, but residential systems here run on potable supply and every zone counts toward the water bill.
Pressure testing zone by zone
We isolate and test each zone separately. Plugging the lateral at the heads and pressurizing it shows whether that zone holds pressure or loses it, which confirms a leak in the buried portion of that specific zone. A leaking mainline between the backflow preventer and the manifold loses pressure across all zones simultaneously, which points us to that trunk run. The meter confirms whether the loss is happening while nothing is supposed to run.
If your bill climbed for no visible reason, or a zone is running wet, call (512) 737-6168 and we can run the pressure sequence.
Finding the break underground
Once a zone or the mainline is confirmed as leaking, we locate the break. Acoustic listening equipment detects the pressure of escaping water in the pipe, and a moisture meter maps where the wet zone is widening underground. On the hard west side of Round Rock the limestone makes the water travel farther before surfacing, so listening matters more than watching for a wet patch. We mark the spot before opening anything, so the trench is small and targeted.
Repairing the system
An irrigation break in a lateral gets the bad section cut out and replaced with the right pipe and fittings, glued or clamped for the application. A cracked zone valve is swapped for a new one matched to the manifold. A failing backflow preventer is rebuilt or replaced, since a leaking preventer wastes water and can also allow contamination back into the supply. We test the repaired zone under pressure before backfilling so we do not have to reopen the trench.
A leaking backflow preventer at the head of the system also gets attention. It separates irrigation supply from potable water inside the house, and a weeping preventer wastes water from both sides of that divide. Many properties deferred preventer inspections during the 2020 drought restrictions, and we check it as part of any irrigation leak job.
Behrens Ranch and Vista Oaks have well-established irrigation systems now old enough that manifold valves and the mainline fittings near the preventer are the usual worn parts.
Why drought stage means fixing it now
Stage 2 drought restrictions in 2026 limit outdoor watering days and times across Round Rock, which makes a leaking irrigation line especially costly. The system wastes water on days it is not supposed to run, and it counts against your total allocation. The clay-soil east side holds moisture differently than the limestone west, so a buried lateral leak there can go months without surfacing as a visible wet patch. Call (512) 737-6168 if the meter is moving while the system is off.
Not sure what you are dealing with? Talk it through.
📞 (512) 737-6168Frequently Asked Questions
How do I know if my irrigation system is leaking underground?
The clearest tell is a water bill that climbs with no change in use. A zone that never reaches full pressure, or the meter turning while the system is off, also points at a buried leak.
Can you test individual irrigation zones?
Yes. We plug each zone at the heads and pressurize it to confirm whether that zone holds. That isolates which lateral or which part of the mainline is losing water.
Does a leaking irrigation system need to be dug up?
Only at the break. We locate the spot acoustically first, then open one targeted trench at the confirmed location rather than digging the whole lateral.
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