How to Fix a Kitchen Faucet Dripping From the Spout

The most common cause of a kitchen faucet dripping from the spout is a worn-out cartridge or O-ring. Replacing these parts usually stops the drip in under 30 minutes.

Quick Answer

Here are fast answers to the most common questions about a dripping kitchen faucet spout.

Why does my kitchen faucet drip from the spout?: A worn cartridge, damaged O-ring, or debris in the valve is the usual cause.
Can I fix a dripping faucet without replacing the cartridge?: Sometimes cleaning the cartridge or tightening the packing nut works, but replacement is often needed.
How much does a replacement cartridge cost?: Cartridges cost between five and twenty dollars depending on the brand.
Will a dripping faucet cause water damage?: Yes, over time a slow drip can waste gallons and cause sink cabinet damage.

Diagnose the Cause of the Drip

First, determine if the drip is from the spout or the handle base. A spout drip usually means the cartridge or O-ring needs attention. Turn off the water supply under the sink. Open the faucet to relieve pressure.

Check the drip pattern: if it drips only when the handle is in a certain position, the cartridge may have a worn seal. If it drips constantly, the O-ring at the base of the spout is likely damaged.

Tools and Parts You’ll Need

Adjustable wrench or basin wrench
Screwdriver (Phillips or flathead)
Replacement cartridge (match your faucet brand and model)
Replacement O-rings (silicone or rubber)
Plumber’s grease (silicone-based)
Towels and a bucket

Step-by-Step: Replace the Cartridge

Turn off the water supply valves under the sink. Open the faucet to drain remaining water.
Remove the handle: pry off the decorative cap, then unscrew the handle screw. Pull the handle off.
Unscrew the retaining nut or clip that holds the cartridge in place.
Pull the old cartridge straight out. Use pliers if it’s stuck, but grip the stem gently.
Take the old cartridge to a hardware store to match the exact replacement.
Insert the new cartridge, ensuring the alignment tabs fit into the notches.
Reinstall the retaining nut and handle. Turn the water back on and test for drips.

How to Replace the Spout O-Ring

If the drip is from the base of the spout or if the spout wiggles, the O-rings need replacement. This is common on pull-down or pull-out faucets.

Remove the spray head if present, then unscrew the spout retaining nut (often under the spout base).
Lift the spout off the faucet body. You’ll see one or two O-rings on the body.
Pry out the old O-rings with a small screwdriver. Note their position and size.
Apply plumber’s grease to the new O-rings and install them in the grooves.
Slide the spout back on, tighten the retaining nut, and reattach the spray head.

When to Call a Plumber

If replacing the cartridge and O-rings doesn’t stop the drip, there may be a cracked valve body or a more complex issue. Also, if the faucet is older than 15 years, replacement may be more cost-effective.

Signs you need a pro: water leaks from under the handle after reassembly, the faucet body is corroded, or you can’t identify the faucet brand for a replacement cartridge.

Pro Tips

Always match the replacement cartridge exactly; bring the old one to the store.
Use silicone-based plumber’s grease on O-rings to prevent future leaks.
Turn off water supply before starting; keep a bucket under the sink.
Take a photo of the cartridge orientation before removing it.

Common Mistakes to Avoid

Using too much force when removing a stuck cartridge can damage the valve body.
Forgetting to install the O-ring in the correct groove causes leaks.
Mixing up hot and cold supply lines when reconnecting.
Overtightening the retaining nut can crack the faucet body.

FAQ

Can I fix a dripping faucet without turning off the water?

No. You must shut off the water supply under the sink to avoid flooding and injury. Open the faucet to drain pressure before disassembly.

How do I know which cartridge to buy?

Look for the brand name on the faucet handle or base. Common brands like Moen, Delta, and Kohler use specific cartridges. Remove the old cartridge and take it to a hardware store for matching.

Why is my new cartridge still dripping?

The cartridge may be improperly seated, or the O-rings may be damaged. Also, check that the retaining nut is snug but not overtightened. Debris in the valve can also cause drips.

How often should I replace the O-rings?

O-rings typically last 3 to 5 years. If you notice a slow drip from the spout base or the spout becomes loose, replace them as part of routine maintenance.

The Bottom Line

A dripping kitchen faucet spout is a common annoyance that you can fix yourself with basic tools. Replacing the cartridge or O-rings usually stops the drip. If the problem persists, consider upgrading to a new faucet for long-term peace of mind.