How to Fix a Dripping Faucet

1. Identify the faucet type

A single-handle faucet usually has a cartridge or ball valve inside. A two-handle faucet typically uses compression stems or ceramic cartridges. Look for a brand name or model number under the handle or on the base.

2. Shut off the water

Close the hot and cold shutoff valves under the sink. Turn the faucet on to release pressure and confirm the water is off. If there are no shutoff valves, close the main water valve and open a low faucet elsewhere to drain the line.

3. Plug the drain and protect the sink

Put the drain plug in so small screws cannot fall in. Lay a towel in the sink and set out a small container for parts. Take a photo at each stage so reassembly is easier.

4. Remove the handle

Pop off the decorative cap if there is one, then remove the screw or hex bolt underneath. Pull the handle straight up. If it is stuck, wiggle gently rather than forcing it.

5. Inspect the cartridge or stem

Remove the retaining nut and pull out the cartridge or stem. Look for cracks, worn rubber, or mineral buildup. For two-handle faucets, check the seat and spring as well. Clean metal parts with vinegar if they are scaled.

6. Replace the worn parts

Install the exact replacement cartridge, seat, or O-rings. Coat rubber parts with a thin layer of silicone grease. Do not substitute a "close enough" part — a mismatched cartridge will leak or fail quickly.

7. Reassemble and test

Reinstall the handle and cap, then open the shutoff valves slowly. Run hot and cold water, watch for leaks around the base and under the sink, and check the aerator. Tighten gently if needed.

8. If it still drips

Recheck the model number and the direction the cartridge was installed. Sediment can also damage a new seat. If the leak continues or the valve body is damaged, replace the faucet or call a plumber.