Describe the evidence
Warning signs worth reporting
Warning signs include unexplained water-bill increases, warm or damp flooring, running-water sounds when fixtures are off, new cracks and musty odors near baseboards. Any of these can justify asking for an assessment, but they are not proof of a slab leak by themselves.
Note the location and timing of each change. Explain whether a damp area is growing, whether the sound is continuous and whether the water-use change has another known explanation. These observations are useful for the plumber; they do not require you to open the floor or select a repair method before the leak has been located.
