Quick answerTurn off the water supply, plug the drain, remove the handle, and replace the worn washer or cartridge. Reassemble, turn water back on, test.
What you'll need
- Adjustable wrench
- Screwdriver set
- Replacement washer/cartridge (take the old one to the store to match)
- Plumber's grease (optional, $3)
- Towel + plug for the drain
Step-by-step
- Turn off the water. Valves under the sink (clockwise). No valves? Shut off the main.
- Plug the drain. Screws and washers love disappearing down drains.
- Remove the handle. Pop off the decorative cap, unscrew the handle screw.
- Remove the cartridge/stem. Unscrew the packing nut with your wrench, pull the cartridge out.
- Inspect. Worn rubber washer? Cracked O-ring? Corroded seat? Replace what's worn β or swap the whole cartridge ($10β20).
- Reassemble in reverse. Don't overtighten β snug is enough.
- Turn water back on slowly and test. Run both hot and cold.
<div class="safety"> <strong>π Stop and call a pro if:</strong> <ul> <li>Shutoff valves are seized or broken (don't force them β they can snap)</li> <li>Water sprays from inside the wall when you disassemble</li> <li>The faucet body itself is cracked or corroded through</li> </ul> </div>
DIY vs pro cost
| Option | Typical cost |
|---|---|
| DIY (washer/cartridge) | $5β$20 |
| Plumber visit | $150β$300 |
A faucet dripping once per second wastes roughly 3,000 gallons a year β fixing it pays for itself in weeks.
Printable checklist
- [ ] Water supply OFF (test that it's off!)
- [ ] Drain plugged
- [ ] Handle + cartridge removed
- [ ] Old part matched at store
- [ ] New washer/cartridge installed
- [ ] Reassembled, water on, no drips
Frequently asked questions
Why does my faucet drip after I turn it off?
Worn washer, O-ring, or cartridge β the seal no longer closes fully. Replacement fixes it.
How much water does a leaky faucet waste?
A drip per second wastes about 3,000 gallons per year.
Do I need to turn off the main water supply?
Usually just the under-sink valves. Use the main only if those valves don't exist or don't work.
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