Turn off every faucet and appliance, then look at the meter near the curb. If the dial keeps spinning, water is escaping somewhere, often under the slab.
Run your hand across the floor to map how big the warm spot is and where it's warmest. Note it so you can point a plumber straight to it.
With the house quiet, put your ear near the warm spot or a nearby wall. A faint hiss or trickle with no fixtures running is a strong sign of a slab leak.
If you see water coming up through the floor or baseboards, turn off the main shut-off valve to stop the flow and limit damage.
A warm patch on your floor is one of the clearest signs of a slab leak on a hot water line. San Antonio homes are mostly built on concrete slabs, and the water lines often run through or under that slab. When a hot line springs a leak, the heat radiates up through the concrete, and you feel it under your feet or notice a pet who suddenly loves that one spot.
Our expansive clay soil is a big reason these happen. It swells when wet and shrinks when dry, and that constant movement stresses the pipes underneath. Add hard water wearing at copper from the inside, and lines that have been fine for years start to fail. You'll often see a higher water bill, low water pressure, or the sound of running water in the walls before the damage shows on the surface.
A plumber locates the leak without tearing up your whole floor. We use electronic listening gear and pressure testing to pinpoint the spot, then talk through options: spot repair, rerouting the line, or repiping if the plumbing is old and likely to keep failing. In homes around Olmos Park, Alamo Heights, and Live Oak with original copper, a reroute often makes more sense than chasing one leak at a time.
This one is urgent. Water under a slab has nowhere good to go. It can undermine the foundation, buckle flooring, and feed mold before you ever see a drop. If you've got a warm spot and a meter that won't stop turning, shut the water off and get a plumber out. We locate and repair slab leaks throughout San Antonio, from Southtown to Universal City and out to Boerne.
Describe what you're seeing to a real San Antonio plumber: call (210) 555-0134 or send the form. Free, no obligation.