Worn cartridge
Many single-handle faucets use a replaceable cartridge to control water flow.
Plumbing troubleshooting
Dripping Faucet: Why It Happens and What to Do
A faucet that drips after shutoff usually has a worn internal part. Identifying the faucet type helps determine the right replacement.
Common causes
Damaged washer or seal
A worn washer or O-ring may let water pass when the handle is closed.
Mineral buildup
Deposits can keep sealing surfaces from closing completely.
Safe checks you can make
- Confirm whether the drip comes from the spout or beneath the sink.
- Close the fixture shutoff valves before any disassembly.
- Look up the faucet model before buying replacement parts.
When to call a professional
Call a plumber if the shutoff valves will not close, the fixture is corroded, or the leak continues after repair.
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.