Quick AnswerSigns of a hidden water leak include an unexplained jump in your water bill, the sound of running water when everything is off, warm spots on the floor for slab leaks, musty smells, staining on walls or ceilings, and a water meter that moves with no fixtures running. Mold in an odd spot is another red flag.
A quick DIY test: note your water meter reading, then avoid all water use for an hour or two. If the meter moved, water is going somewhere it should not - usually a supply line, toilet flapper, or an underground or in-wall leak.
Hidden leaks are expensive because they run for weeks before anyone notices. Slow, gradual leaks are also the type insurers often deny as maintenance, so finding and fixing them early protects both your home and your coverage.
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