Leaky Faucet: How to Fix a Dripping Faucet
The faucet drips steadily from the spout even when fully closed, often worse from the hot side.
DIY Cost
$5–$25
Typical Pro Cost
$150–$250
Tools Needed
- Adjustable wrench
- Phillips and flathead screwdrivers
- Allen key set
- Plumber's grease
Parts Needed
- Replacement cartridge, washer, or O-ring (matched to your faucet brand/model)
⚠️ Safety Warnings
- Always shut off the water supply before disassembling a faucet — even a slow drip from a partially open valve can spray once you remove parts.
- Don't overtighten packing nuts or retaining clips — plastic threads on many modern faucets crack easily and turn a $10 fix into a full faucet replacement.
Step-by-Step Instructions
Shut off the water supply
Turn off the shutoff valves under the sink (or the main water supply if there are none). Open the faucet afterward to release any remaining pressure and confirm the water is off.
Plug the drain and remove the handle
Plug the drain so small screws/parts can't fall in. Pry off the decorative cap on the handle, then remove the screw underneath and pull the handle straight up.
Identify your faucet type
Compression faucets (two handles, need firm force to shut off) use a washer. Cartridge, ball, and ceramic-disk faucets (common on single-handle faucets) use a cartridge or O-rings instead. This determines which part you need to replace.
Remove and inspect the worn part
Unscrew the packing nut or retaining clip and pull out the cartridge/stem. Look for a cracked, flattened, or grooved washer or O-ring — that's almost always the source of the drip.
Install the matching replacement part
Take the old part (or a photo/model number) to a hardware store to match it exactly. Coat the new washer/O-ring lightly with plumber's grease before installing — this helps it seat properly and last longer.
Reassemble and test
Reassemble in reverse order, turn the water supply back on slowly, and run the faucet for a minute checking for drips at the spout and leaks around the handle base.
When to Call a Professional
If replacing the cartridge or washer doesn't stop the drip, the valve seat inside the faucet body itself may be corroded or damaged — that requires a seat-dressing tool or a full faucet replacement, and is worth a plumber's opinion before you buy parts twice.