Most kitchen faucet leaks start as a small drip, then turn into a wet cabinet, stained sink deck, or wasted water. If you want to know how to fix a leaky kitchen faucet, do not start by taking the handle apart. Start by finding where the water appears: the spout, handle, base, sprayer hose, or small water line under the sink. That location points to the failed part. This guide helps you decide whether to replace a washer, O-ring, cartridge, hose, or valve part, and when the safer move is to call a plumber.
Quick Answer
How to fix a leaky kitchen faucet: shut off the hot and cold water, plug the drain, remove the handle, and replace the worn cartridge, washer, O-ring, spring, or seal. The most common cause of a leaking faucet is a failed internal seal, but the wet spot tells you which one.
- Spout drip: cartridge, washer, spring, or valve seat.
- Handle leak: O-ring, packing nut, or cartridge seal.
- Base leak: spout O-rings or deck gasket.
- Under-sink leak: supply line, sprayer hose, or shutoff valve.
- Repeat leak: wrong part, debris, or damaged seat.
Find the Leak Before You Take the Faucet Apart
Find the leak location before you remove the handle. A dripping faucet, a handle leak, and water under the sink usually point to different failed parts.
Dry the faucet, sink deck, backsplash, and cabinet floor. Run cold water, hot water, and the sprayer one at a time. Wrap a dry paper towel around the handle, base, sprayer hose, and water supply lines, which are the flexible tubes that feed water to the faucet.
If the faucet drips from the spout when the handle is off, the internal valve is not sealing. That usually means a worn faucet cartridge, washer, spring, ceramic disc seal, or valve seat.
If water appears under the sink, do not assume the faucet cartridge failed. A wet P-trap or drain fitting belongs in a sink plumbing diagram check, while a wet supply nut, shutoff valve, or sprayer hose belongs to the faucet system.
| Where water appears | Likely cause | First check | DIY risk |
|---|---|---|---|
| Spout drips when off | Cartridge, washer, spring, valve seat | Turn handle off gently | Low |
| Around handle | O-ring, packing nut, cartridge seal | Dry towel around handle | Low to medium |
| Around base | Spout O-rings, deck gasket, loose nut | Watch base while water runs | Medium |
| Under sink | Supply line, sprayer hose, shutoff valve | Trace water upward | Medium to high |
This step prevents the common mistake of replacing a good cartridge while the real leak keeps dripping below the cabinet.
Tools, Parts, and Water Shutoff Checks
You need working shutoff valves before any faucet repair. Shutoff valves are the small valves under the sink that stop hot and cold water before it reaches the faucet.
Gather these items first:
- Adjustable wrench
- Phillips and flathead screwdrivers
- Allen wrench set
- Needle-nose pliers
- Towel and small bucket
- Replacement cartridge, washer, O-ring, or repair kit
- Plumber’s grease for rubber faucet seals
- Phone camera for part-order photos
Turn both shutoff valves clockwise. Open the faucet to drain pressure. If water keeps running, stop before opening the faucet body.
Cover the sink drain before removing any screw or clip. A dropped spring or set screw can turn a 30-minute repair into a search under the cabinet.
Basic kitchen safety tips matter here. Keep the floor dry, protect sharp sink edges, and do not work near live electrical parts if water is leaking close to an outlet or garbage disposal.
How to Fix a Leaky Kitchen Faucet in 8 Steps
The safest way to handle how to fix a leaky kitchen faucet is to shut off water, remove parts in order, replace the failed seal, and test before closing the cabinet. Work slowly because small clips and springs decide whether the repair holds.
- Shut off hot and cold water.
Close both valves under the sink. Open the faucet to drain trapped water. If you have a pull-down sprayer, press it once to empty water left in the hose. - Plug the drain and protect the sink.
Use a stopper or towel over the drain. Lay another towel in the basin so tools do not scratch the finish. - Remove the handle.
Look for a set screw on the side, a screw under a small cap, or a screw under the handle. Use the right Allen wrench or screwdriver. If the handle sticks, wiggle it gently instead of prying hard. - Photograph the parts.
Take a clear photo before removing clips, nuts, cartridges, stems, or springs. This helps you reinstall each piece in the right direction. - Remove the failed part.
A cartridge faucet usually has a retaining clip or nut. A compression faucet has a valve stem, which is the threaded part that moves up and down when you turn the handle. A ball faucet has a cap, cam, ball, seats, and springs. - Match the replacement exactly.
Bring the old cartridge, washer, or O-ring to the store if possible. A part that looks almost right can still leak. Match length, tabs, holes, and seal position. - Install the new part.
Coat O-rings lightly with plumber’s grease. Tighten nuts until snug, then stop. Too much force can crush the new seal or crack an older plastic part. - Turn the water back on slowly.
Open the shutoff valves partway first. Watch the spout, handle, base, sprayer hose, and cabinet below. If everything stays dry, run hot and cold water for one minute.
If the faucet is old, loose, or badly corroded, check the sink holes before replacing it. A kitchen sink guide can help you match faucet holes, mount type, and sink layout.
Match the Repair to Your Faucet Type
The correct repair depends on the faucet mechanism. A single handle kitchen faucet usually uses a cartridge, ball, or ceramic disc, while a two handle kitchen faucet may use compression stems or two separate cartridges.
A compression faucet has handles that turn several times. It often leaks because a rubber washer wears down or the valve seat becomes rough. The valve seat is the metal surface the washer presses against.
A cartridge faucet uses a removable faucet cartridge to control water flow. The handle usually moves smoothly. Replace the cartridge with the exact model and align it the same way as the old one.
A ball faucet is a single-handle faucet with a rounded ball inside. It uses small seats, springs, and seals. A full ball faucet repair kit is safer than guessing which tiny part failed.
A ceramic disc faucet uses a ceramic cylinder and rubber seals. It may leak if grit keeps the disc from closing. Clean the seals first, then replace the cylinder if it still leaks.
For a two-handle leak, close one supply valve at a time to find the hot or cold side. For a single-handle leak, the cartridge or ball assembly is usually the first part to check.
Why Is My Faucet Still Leaking After I Fixed It?
A faucet that still leaks after the first repair usually has the wrong part, debris under the seal, a damaged valve seat, or a leak source that was misread. Do not keep tightening the handle to force it closed.
If the spout still drips, remove the new part and compare it with the old one. Check length, tabs, holes, rubber seals, and direction. Some cartridges fit into the faucet body but fail if turned the wrong way.
If a compression faucet still leaks after a new washer, inspect the valve seat. A pitted or scratched seat cannot seal cleanly, even with a new washer.
If water sprays unevenly or flow drops after repair, clean the aerator. The aerator is the small screen at the faucet tip. Soak it in white vinegar, rinse debris, and reinstall it straight.
If the cabinet below is wet only when the faucet runs, check the pull-down hose, quick-connect fitting, supply nuts, and shutoff valves. Another cartridge will not fix a leaking hose.
This is the honest stop point. If water keeps showing under the sink after a careful check, compare the faucet connections with basic sink installation parts so you know whether the faucet, supply line, or drain is the real source.
How Much Time and Money Should You Expect?
Most kitchen faucet repair jobs take less than an hour after you have the correct part. Across five published repair-time figures checked in August 2026, the range runs from about 15 minutes to under 2 hours, with a midpoint near 68 minutes.
The spread is wide because some instructions measure only a washer or cartridge swap. Others include beginner prep, stuck handles, part matching, and cleanup.
| Repair decision | Typical cost context | Time context | Better choice |
|---|---|---|---|
| Replace washer or O-ring | $2 to $12 parts | Often under 1 hour | Repair |
| Replace cartridge | $15 to $30+ parts | Often under 1 hour | Repair if body is sound |
| Replace ball repair kit | $20+ parts | 30 to 90 minutes | Repair if parts match |
| Hire plumber | $125 to $350+ | Visit length varies | Use for valve or supply-line issues |
Prices vary by region, faucet brand, and whether labor is included. A dripping faucet repair stays cheap when the faucet body is sound and the failed part is easy to match.
Repair makes sense for a first leak from a washer, O-ring, cartridge, spring, or seal. Replacement makes more sense when the faucet body is cracked, the finish is failing, parts are unavailable, or the same leak returns after a correct repair.
When to Stop and Call a Plumber
Call a plumber if the shutoff valves do not stop water, a supply line leaks, the faucet body is cracked, or water appears near electrical parts. These problems carry more risk than a worn washer.
Stop DIY work if you see:
- Water still running after both shutoff valves are closed
- Corroded or brittle supply lines
- A cracked faucet body
- Wet cabinet walls or swelling wood
- Leaks near a garbage disposal or outlet
- A stuck part that needs heavy force
A plumber may also be required for some plumbing changes, depending on local rules. Permit and licensing rules vary by city and county.
The expensive mistake is not calling a plumber. The expensive mistake is opening a water line you cannot close again.
How to Prevent Another Kitchen Faucet Leak
The best prevention is gentle use, clean water flow, and early repair. Most faucet seals fail faster when handles are forced, grit reaches the cartridge, or mineral buildup clogs the aerator.
Clean the aerator once or twice a year. Wipe around the faucet base after heavy sink use so small leaks show early. Do not crank the handle tighter to stop a drip.
After any repair, clean the sink area so new water marks are easy to spot. A regular clean kitchen sink routine helps separate faucet leaks from splashes, stains, and residue.
If the smell, backup, or standing water comes from the drain, that is a different problem. A kitchen sink drain issue will not be fixed with a new faucet cartridge.
FAQs
Can You Fix a Leaky Faucet Yourself?
Most homeowners can fix a leaky faucet if the shutoff valves work and the leak comes from the spout, handle, or base. The job usually needs basic tools and a matching washer, O-ring, cartridge, or repair kit. Call a plumber if the supply line or valve leaks.
How Do I Fix My Kitchen Faucet From Leaking Underneath?
Start by drying the cabinet and tracing the water upward. If the leak starts at a supply nut, shutoff valve, sprayer hose, or quick-connect fitting, the problem is below the sink. If water runs down from the faucet base, check the deck gasket or spout O-rings.
Why Is My Faucet Still Leaking After I Replaced the Cartridge?
A faucet can still leak after cartridge replacement if the cartridge is the wrong model, installed backward, not seated fully, or sitting on debris. A damaged valve seat, worn O-ring, loose connection, or cracked faucet body can also keep water leaking.
Do I Need to Shut Off the Main Water Line?
You do not need to shut off the main water line if the hot and cold shutoff valves under the sink fully stop water. If those valves are stuck, leaking, or fail to close, shut off the main water supply or call a plumber.
Should I Repair or Replace a Leaky Kitchen Faucet?
Repair the faucet if the body is solid, parts are available, and the leak is limited to a cartridge, washer, O-ring, spring, or seal. Replace it if the body is cracked, hardware is badly corroded, parts cannot be matched, or correct repairs keep failing.
Final Recommendation
The best answer to how to fix a leaky kitchen faucet is diagnosis first, repair second. Find where the water starts, shut it off safely, replace the exact failed part, and test slowly. If the leak comes from a supply line, failed shutoff valve, cracked faucet body, or wet electrical area, stop and get professional help before a small drip becomes cabinet damage.
