Under-Slab Sewer Leak Detection in Leander, TX

Under-slab sewer leak detection looks for leaks in the drain and waste lines that run beneath the foundation, from tubs, sinks and toilets out to the sewer connection. Unlike water lines, these pipes are not pressurized, so a leak never shows on the meter. Instead, waste water seeps into the soil each time something drains, slowly wetting the clay under the house.

Finding it needs different tools from supply line slab leak detection: a camera run through the drain, and often a hydrostatic test that fills the drain system to see whether it holds water. It is part of full leak detection in Leander, and is often the missing answer when a house has foundation movement but no water line leak.

The same expansive clay that stresses supply lines also works on drain pipes. As the clay swells and shrinks with the seasons, a slab can move slightly, and the joints in a long run of drain pipe can pull apart or crack. Drain lines rely on a steady downward slope; once a section sags, water sits in it and finds its way out of weak joints.

Installation in fast-growing areas is another factor. Poor bedding under drain pipe, or backfill with rocks against the pipe, can lead to cracks years later. Tree roots can enter through any small gap near the outside cleanout and work their way inward.

Finally, what goes down the drain matters. Grease, wipes and other debris build up at sags and joints, slowing flow and holding water in the weakest parts of the line.

Most Leander homes drain through PVC pipe under the slab, which does not rust but can crack or separate at joints if the ground moves or the pipe was poorly bedded. Older homes near Old Town Leander may have older materials. A camera inspection shows what you have and its condition.

Foundation repair companies often ask for a hydrostatic test before they start, because fixing the foundation without fixing a drain leak that is softening the soil may not hold. If you are planning foundation work, a provider can test the drains first.

Sewage backing up into a tub or shower, or a strong sewer smell with wet floors, needs prompt attention. Stop using water in the house so less waste goes down the drains, keep people away from wet areas and call. A provider can clear a blockage and inspect the line to see whether a break under the slab is involved.

Because drain leaks do not pass through the meter, they do not raise the water bill the way supply leaks do. That is one reason they go unnoticed. If your home has foundation movement or a damp floor and supply line tests come back clean, ask the provider to check the drains next. A recorded camera inspection is also useful to keep for a future sale.

When a Leander house shows signs of moisture under the floor, providers usually rule out the supply side first, because a pressurized leak can be confirmed in minutes with the water meter. If the meter is still with everything off, the water is not coming from the supply lines, and attention turns to the drains. That order saves time and money: a hydrostatic test involves plugging the system and filling it, which takes longer than a meter check.

The two kinds of leak also affect the soil differently. A supply leak runs constantly, so it can soak a large area. A drain leak releases water only when fixtures drain, often in bursts from showers, tubs and laundry, so the wet area may come and go. Either can contribute to slab movement on clay, which is why some foundation contractors in the area ask for both tests before they start work.