If you're in Los Angeles and suspect a slab leak, look for these signs: hot spots on your flooring, damp carpeting or warped hardwood floors, mildew smells or visible mold, bubbling or peeling paint, yellowish water stains on ceilings or walls, a water meter that runs when all water is turned off, unusual puddles near your foundation, or the sound of trickling water when no water is being used. These symptoms indicate a potential leak and should prompt you to seek professional leak detection services.