Fix a Leaky Faucet Yourself, or Call a Plumber?

A dripping faucet is annoying, and over time it wastes water. The good news is that many leaks are simple to fix with basic tools. The key is knowing what type of faucet you have and when to stop.

Why faucets leak

Most drips come from one of a few worn parts:

• A worn washer or seat in a compression faucet, the older style with separate hot and cold handles.
• A worn O-ring around the stem, which often shows up as a leak at the base of the handle.
• A failing cartridge in a single-handle faucet.
• Corroded valve seats, which let water slip past a good washer.
• Loose parts, such as a packing nut or a retaining clip.

Before you start

1. Shut off the water. Look under the sink for the two shutoff valves and turn them clockwise. If there are none, turn off the main water valve.
2. Open the faucet to drain the line and confirm the water is off.
3. Plug the drain or place a towel in the sink so small parts do not disappear.
4. Take photos as you disassemble, so you can reverse the steps.

The basic repair

The details depend on the style, so look up your faucet's brand and model if you can. In general:

1. Remove the handle by prying off the decorative cap and loosening the screw underneath.
2. Remove the retaining nut or clip to pull out the stem or cartridge.
3. Inspect the washer, O-ring or cartridge for wear, cracks or flattening.
4. Take the old part to a hardware store to find an exact match. Bring the faucet brand and model when you can.
5. Replace the worn parts, clean any mineral buildup and reassemble in reverse order.
6. Turn the water on slowly and check for leaks.

Many hardware stores sell repair kits for common faucet brands, which makes matching parts easier.

Tips that help

• Use a rag between pliers and finishes to avoid scratches.
• Do not overtighten, since this can crack parts or damage threads.
• Replace parts in pairs, such as both O-rings, if you have the kit.
• A little plumber's grease on rubber parts helps them last.

Signs it is time to call a plumber

Stop and call a professional if:

• The shutoff valves do not work or leak when you turn them.
• The fixture is corroded and parts will not come apart without force.
• You replaced the parts and it still leaks.
• You see water stains, a wet cabinet floor or mold, which suggest a leak somewhere else.
• The faucet is old enough that parts are unavailable, so replacing it may be cheaper.
• Water pressure drops across the house, or you hear banging pipes.

A leak inside the wall or under the floor is not a DIY repair. Quick action limits damage, so do not wait. Our guide to hiring a plumber shows what to ask before you book.

Consider a replacement

If your faucet is decades old, constantly drips or has a worn finish, replacement may make more sense than repair. Modern faucets are easy to install, often with flexible supply lines, and many use less water. If you are comfortable, it can be a good first plumbing project. If not, a plumber can swap it quickly.