A leak at the base of a kitchen faucet is usually caused by worn O-rings around the spout, a loose faucet mounting nut, or a worn seal between the faucet and the sink. Sometimes the faucet body itself has cracked.
Parts That Wear Out
- Worn O-rings: swivel spouts have rubber rings that wear from turning back and forth.
- Loose base: the nut under the sink that holds the faucet can loosen, letting water seep under the base plate.
- Old gasket or putty: the seal between the faucet and the sink deck can break down.
- Cartridge problems: a worn cartridge can push water out around the handle and down to the base.
- Cracked body: older faucets can crack inside from age or freezing.
Where the Water Ends Up
Water that pools at the faucet base can run through the mounting hole into the cabinet. You may see drips on the supply lines, damp cabinet floors, or stains on the back wall. A leak that seems small on top can do more damage underneath.
Spotting the Drip
Dry the counter and faucet completely. Run water with the spout in different positions and watch for water at the base. Then look under the sink with a flashlight to see whether water is coming down from the faucet or up from the supply lines.
Fixing It
Replacing O-rings or a cartridge can solve many leaks, but parts must match the faucet brand and model. If the faucet is old or cracked, replacing it may be easier. Always shut off the valves under the sink before taking the faucet apart.
Keep the cabinet dry with a towel until the repair is done.
If water has already reached the cabinet or floor, getting the faucet leak fixed promptly limits the damage. For help choosing a new kitchen faucet, you can ask our plumbers which models fit your sink at (833) 603-1840.