Pool Return Line Leak Under a Concrete Deck in Stafford, TX – Before & After

This Stafford pool was losing close to an inch a day and the deck told us nothing. No wet spot, no sinking slab, no sound outside. The loss climbed when the pump ran, which put the pressure side of the plumbing at the top of the list — but that still left several lines and a whole patio to choose from. The photograph on the left is the moment the guesswork ended. That is the leak, caught while the line was under test.

Why the deck had to be opened at all

Pool lines in this part of Fort Bend County are trenched in before the deck is poured, so they end up running underneath it. When a joint fails twenty years later, the failure is under four inches of concrete rather than out in the yard. We do not open concrete to look. We open it once, in one place, after the line has been isolated and the leak has been located to within about a foot.

Finding it: isolate, pressurise, listen

Each line was closed off at the equipment pad and tested on its own. Most held their pressure. One bled down steadily, which named the line but not the spot. From there it is a matter of following the run and listening. Air escaping from a pressurised pipe underground makes a sound you can track with electronic equipment, and the signal peaks over the failure. The steps on this job:

Isolating every line at the pad and pressure testing them separately
Identifying the return line as the one losing pressure
Listening along the run to place the leak beneath the deck
Marking a single cut area rather than a trench line
Saw cutting the slab so the patch would have clean square shoulders

Before & After Result

The before photograph shows the opened hole with the line still under test. Water and air are pushing up around the pipe and foaming at the surface — that turbulence is the leak, sitting exactly where the listening equipment said it would be. There is no interpretation needed at that point. The after photograph is the same deck once the pipe had been repaired, tested again and the concrete closed back up. One round patch, roughly the size of a dinner plate, sitting across a control joint. The rest of the patio was never touched. New concrete cures lighter than twenty year old concrete and will darken over the coming months as it weathers. Every connection was pressure tested before it was buried, and the repair carries our 2-year warranty.

Pool Leak Repair in Stafford & Nearby Communities

We find and repair underground pool plumbing leaks throughout Stafford, Missouri City, Sugar Land, Meadows Place, Richmond and the surrounding southwest Houston area. If your pool loses more water while the pump is running, that pattern is worth telling us about — it narrows the search before we arrive. Call (346) 850-9775 or schedule online, and we will find it before we open anything.