Turn off every fixture and appliance that uses water. Watch the water meter. If the dial keeps moving, water is escaping somewhere, likely under the slab.
Walk the floor barefoot for warm spots and listen for a faint hiss or running sound near walls when the house is quiet.
If you find a spreading warm area or hear steady running, close the main shut-off valve until a plumber arrives. That stops the loss and the damage.
Many Gonzales homes are built on concrete slabs with the water lines running underneath. When a hot line springs a leak down there, the heat can warm the floor above it. Pair that with a water bill that climbs for no reason, or the sound of water moving when no one's using any, and you're likely looking at a slab leak.
Causes range from pipe rubbing against rebar or gravel over the years to corrosion from the mineral-heavy water common in the valley. A plumber doesn't start by breaking concrete. They use listening gear and pressure testing to trace the exact spot, then decide whether a targeted repair or a reroute around the bad section makes more sense. Finding it precisely means less floor gets opened up.
Don't sit on it. A slab leak wastes water every hour and can undermine flooring, warp baseboards, and grow mold in the pad underneath. If the warm spot is spreading or you smell must or see buckling floors, treat it as urgent and get someone out that day.
Describe what you're seeing to a real Gonzales plumber: call (831) 555-0109 or send the form. Free, no obligation.