How To Repair Leaking Kitchen Faucet: Easy Guide

Can I repair a leaking kitchen faucet myself? Yes, you absolutely can repair a leaking kitchen faucet yourself with a few basic tools and clear steps. This guide will show you how to fix dripping faucet issues and stop annoying leaks without calling a plumber right away.

Getting Ready for Your Faucet Fix

Before you start, you need to know what kind of faucet you have. Different faucets leak for different reasons. Knowing the type helps you plan your DIY faucet repair.

Identifying Your Faucet Type

Most kitchen faucets fall into four main groups. Look closely at the handle(s) to figure out which one you have.

Faucet Type	Look For	Common Leak Source
Compression	Two handles (hot and cold) that you must twist tight.	Worn washers or seats.
Cartridge	One or two handles that move up/down or side-to-side smoothly.	Cracked or worn-out cartridge.
Ball	One handle that sits on a round base (often older styles).	Worn seals or springs.
Disc (Ceramic)	Single handle resting on a wide, flat cylinder.	Cracked ceramic discs or worn inlet seals.

Essential Tools Checklist

Gather these items before turning off the water. Having everything ready makes the job much faster.

Adjustable wrench or basin wrench
Screwdrivers (Phillips and flat-head)
Pliers (needle-nose are helpful)
White vinegar and a soft cloth (for cleaning mineral deposits)
Replacement parts kit (O-rings, washers, or a new cartridge)
Plumber’s grease (silicone-based)
Towel or small bucket to catch water

Step 1: Shut Off the Water Supply

This is the most crucial first step. You cannot repair leaky kitchen sink tap work if water is still running.

Locating the Shut-Off Valves

Look under the kitchen sink cabinet. You should see two small valves connected to the hot and cold water lines running up to the faucet.

Turn the hot water valve clockwise until it stops.
Turn the cold water valve clockwise until it stops.

If you cannot find these valves, or if they won’t turn, you must shut off the main water supply to your entire house. This valve is usually near the water meter or where the main line enters your home.

Releasing Remaining Water Pressure

Even after shutting off the valves, some water stays in the lines.

Turn the faucet handles to the “on” position (both hot and cold).
Let the remaining water drain out completely. This relieves pressure, making it safe to take the faucet apart.

Step 2: Addressing Common Leak Locations

Leaks usually happen in one of three places: the spout tip (drip), around the handle, or at the base where the faucet meets the counter.

Stopping Kitchen Faucet Drips (Spout Leaks)

If your faucet drips from the spout, you usually need to focus on the internal parts that control water flow. This often involves a faucet valve replacement or replacing an internal component.

For Compression Faucets: Replacing Washers

Compression faucets rely on rubber washers to stop water flow. Over time, these crush and fail.

Remove the decorative cap on the handle top using a small flat-head screwdriver.
Unscrew the handle screw underneath and lift the handle off.
Use a wrench to unscrew the packing nut surrounding the stem.
Pull the stem out. Note the washer at the bottom of the stem.
Remove the old washer and replace it with a new one of the exact same size.
Also, check the seat washer (at the bottom of the faucet body) and replace it if it looks worn.
Apply a thin coat of plumber’s grease to the threads before reassembly. This helps future repairs and ensures a smooth feel when you stop kitchen faucet drips.

For Cartridge Faucets: Replacing the Cartridge

If you have a cartridge faucet, the entire plastic or brass mechanism inside often needs replacing. This is often the easiest way to replace kitchen faucet cartridge.

Remove the decorative cap and handle screw, just like with the compression style.
Some cartridges have a small retaining clip holding them in place. Use needle-nose pliers to gently pull this clip straight up and out.
Grasp the top of the exposed cartridge stem with pliers and pull it straight up. It might take a firm tug.
Take the old cartridge to the hardware store to match the part number exactly.
Insert the new cartridge, ensuring the alignment tabs fit correctly into the faucet body slots.
Replace the retaining clip and reattach the handle.

Fixing Leaks Around the Handle (Packing Leaks)

If water seeps out around the base of the handle when the water is on, the seal around the stem or cartridge is failing.

Tightening Loose Faucet Handle

Sometimes, the issue is simple: you might just need to tighten loose faucet handle.

Remove the handle assembly as described above.
Look for a packing nut (on older models) or a retaining collar (on newer models).
Tighten this nut or collar just a quarter-turn at a time. Do not overtighten; this can make the handle stiff.
Test the faucet. If it still leaks, proceed to replace the O-rings.

Replacing Worn Faucet O-Rings

O-rings are small rubber rings that seal moving parts. Replacing worn faucet O-rings is vital for stopping leaks around the spout body or handle stem.

Disassemble the faucet down to the main body where the spout swivels (if applicable).
Carefully slide the spout off the faucet body. You might need to wiggle it slightly.
On the exterior of the faucet body or on the base of the spout itself, you will see one or two small rubber O-rings sitting in grooves.
Use a small pick or screwdriver to gently roll the old O-rings out of their grooves.
Clean the grooves thoroughly.
Coat the new O-rings liberally with plumber’s grease. This keeps them soft and makes them seal better.
Roll the new rings into place.
Slide the spout back on, ensuring the O-rings do not get nicked or pinched during reassembly.

Resolving Leaks at the Faucet Base

Fixing faucet base leak usually means the seals beneath the faucet body, where it meets the countertop or sink deck, have failed, or the mounting nuts are loose.

Access the underside of the sink cabinet again.
Look for large mounting nuts that secure the faucet body to the sink deck.
Use a basin wrench (this tool is designed specifically for tight spaces under sinks) to snug these nuts up. Be firm, but do not crank down so hard that you crack the sink material.
If the leak persists, the gasket between the faucet base and the counter might be damaged. You may need to lift the entire faucet assembly up slightly, clean off all the old putty or sealant, apply a fresh bead of silicone caulk or plumber’s putty around the base, and firmly remount the faucet.

Deep Dive: Addressing Specific Faucet Issues

Sometimes the problem isn’t just a slow drip; it’s a major failure or a blockage.

Dealing with Low Water Pressure or Strange Noises

If you are trying to fix dripping faucet but notice the water pressure is also very low, the aerator at the tip of the spout is likely clogged with debris.

Cleaning the Aerator

Unscrew the aerator cap at the very end of the spout (usually by hand or with pliers padded with a cloth).
Disassemble the screen and washer inside the aerator housing.
Soak all the small parts in a bowl of white vinegar for at least one hour. Vinegar dissolves mineral deposits (limescale).
Rinse everything well and reassemble.

What If the Leak Seems Stuck? (Ball Faucets)

Ball-type faucets use a rotating metal or plastic ball inside to control flow. When they leak, it is usually due to damaged springs or seals that sit beneath the ball.

Disassemble the handle and cap assembly. You will usually see an adjustment ring. Loosen this.
Lift out the cam assembly and the control ball.
Inside the faucet body, you will see small rubber seats and springs. These are often sold as a kit specific to the faucet brand.
Use needle-nose pliers to carefully pull out the old springs and seats.
Insert the new springs first (the pointed end down), followed by the new rubber seats resting on top of the springs.
Reinsert the ball, making sure the groove on the ball lines up with the pin inside the faucet body.
Reassemble the cam, adjustment ring, and handle. Tightening the adjustment ring correctly is key to stopping leaks here.

When to Consider Plunging the Faucet (Rare)

While plunging kitchen sink faucet is usually for clearing a drain clog, sometimes, if debris has been drawn into the lower lines and is affecting the valve mechanism (especially in older, low-quality fixtures), a gentle plunge might dislodge it. However, this is highly unusual for a leak at the spout. If you suspect a blockage is causing back-pressure that forces a seal to fail, try this only after confirming all other internal parts are sound. Be very gentle; aggressive plunging can damage newer, delicate internal plastic parts.

Step 3: Reassembly and Testing

Putting the faucet back together requires care to avoid damaging the new parts.

Reassembly Tips

Lubrication is Key: Always use plumber’s grease on threads, O-rings, and any moving plastic or metal parts that rub against each other. This prevents friction wear and makes future repairs easier.
Alignment Matters: When installing cartridges or ceramic discs, ensure any tabs or alignment markings match up perfectly before screwing things down. If they are slightly off, the handle will feel wrong or the valve won’t close fully.
Hand Tighten First: Screw all nuts and screws in by hand first to ensure they are cross-threaded. Only use tools for the final snugging.

Testing Your Work

Ensure all handles are in the “off” position.
Slowly turn the cold water shut-off valve back on (counter-clockwise). Watch underneath the sink for any immediate leaks from the supply lines.
Slowly turn the hot water shut-off valve back on.
Turn the faucet handles on briefly to flush air out of the lines.
Turn the faucet off. Watch the spout tip closely for several minutes. If the drip is gone, congratulations, you have successfully repaired the leak!
Check around the handles and the base of the faucet while the water runs and after it’s off to ensure there are no side leaks.

When to Replace the Entire Faucet

While many leaks are repairable, sometimes the metal body of the faucet itself is corroded, or the internal valve seats are permanently scored. If you have performed a faucet valve replacement and replaced all O-rings, but the leak continues, it is time to consider a new unit.

Replacing the entire unit is often easier than hunting down obscure vintage parts for an aging faucet. If your faucet is over 10–15 years old, replacement might be a better long-term investment than extensive DIY faucet repair.

Maintaining Your Faucet to Prevent Future Leaks

Preventative care keeps your faucet running smoothly and prevents wear on parts like O-rings and washers.

Water Quality: Hard water leaves mineral deposits. These deposits are abrasive and can scratch the smooth surfaces that seals rely on. Use a water softener if you have very hard water.
Gentle Operation: Avoid slamming handles shut. Rapid water shutoff creates “water hammer,” which puts stress on internal seals and can accelerate wear.
Regular Cleaning: Clean the aerator every three to six months to prevent buildup that restricts flow and strains the valve mechanism.

Frequently Asked Questions (FAQ) About Faucet Repair

Q: How much does it cost to fix a leaking faucet?

A: If you do the repair yourself, the cost is minimal—usually between \$5 and \$30 for replacement parts like a set of O-rings, washers, or a universal cartridge kit. If you hire a plumber, expect costs to range from \$100 to \$300, depending on your location and the complexity of the issue.

Q: Can I use regular grease instead of plumber’s grease?

A: No. You should only use silicone-based plumber’s grease. Regular oil or petroleum jelly can break down quickly when exposed to water pressure and temperature changes. Plumber’s grease is safe for drinking water systems and maintains its sealing properties longer, which is essential for replacing worn faucet O-rings.

Q: My faucet is dripping, but I have two handles. Do I need to replace both sides?

A: Typically, no. A drip from the spout usually means only the washer or seal on the side you used most recently (or the side that failed first) needs replacement. However, if both sides feel loose or the faucet is very old, it is good practice to check and replace the seals on both the hot and cold stems simultaneously when you repair leaky kitchen sink tap.

Q: What if the leak is coming from the base, but the mounting nuts are tight?

A: If the leak persists at the base after you tighten loose faucet handle mounting nuts, the problem is likely the base gasket or putty. You will need to remove the entire faucet assembly, clean the surface thoroughly, and apply a fresh sealant (like silicone caulk or plumber’s putty) before reinstalling the faucet body.