Leaks
Signs of a Hidden Water Leak
Common warning signs that a leak may be developing where you can't see it.
Why hidden leaks matter
A hidden leak can develop where you can't easily see it, behind a wall, under a floor, or at a fitting. Left alone, even a slow drip can damage materials and raise your water bill. Catching signs early and asking for an assessment helps you understand what's happening.
Signs to watch for
- Damp stains on ceilings, walls, cabinets, or floors.
- The sound of water running when no fixtures are on.
- A water bill that rises without a change in your usage.
- Musty odors or visible mold near plumbing.
- Warm or buckled flooring near a hot-water line.
What to do next
Note when you first noticed the sign, where it is, and anything that changed recently. If it's safe to do so, take a photo. Share these details when you request service. See our guide on what to send a plumber for a full checklist.