estimated cost of slab leak
1 Detecting leakage and finding the site of a slab leak can require specialized equipment and skills, at a cost that can range from $125-$400. 2  SlabLeakPro.com in California, for example, offers water leak detection for a flat rate of $125, while SlabLeak.com in Texas charges $375. SlabLeak.com charges a minimum of $1,850 for a slab leak in a pressurized water pipe and a minimum of $2,500 for a slab leak in a sewer (drain) line.