Loose connection
A fitting beneath a sink may drip only when the fixture runs. Do not overtighten or force a corroded fitting.
Plumbing troubleshooting
Leaking Pipes: What to Check and When to Call a Plumber
A small pipe leak can damage cabinets, walls, and floors. Locate the moisture, keep water away from electrical outlets, and shut off the nearest fixture valve or main supply if the leak is active.
Common causes
Worn or corroded pipe
Older supply lines can develop pinhole leaks or corrosion. A licensed plumber can determine whether a section needs replacement.
Hidden leak
A damp wall, stain, or unexplained meter movement can point to a leak behind a surface.
Safe checks you can make
- Dry the area and look for the exact source of the drip.
- Check whether the leak happens only when a fixture is in use.
- Turn off the nearby shutoff valve or main water valve if water is escaping.
When to call a professional
Call a plumber promptly for an active leak, hidden moisture, damaged supply line, or a connection you cannot safely isolate.
Explore other plumbing problems
This guide is general information, not a diagnosis. If water is near electricity, avoid the area and get immediate professional help.