How to Fix a Leaky Kitchen Faucet Without Replacing It
By EasyToFix Homes Team
A kitchen faucet that drips all night is more than an annoyance. A steady drip can waste hundreds of gallons of water in a year, stain the sink, and wear out the finish around the spout. The good news is that most kitchen faucet leaks do not require a new faucet at all. In the majority of homes, the cause is a single worn cartridge, washer, or O-ring that costs a few dollars and takes under an hour to replace. This guide walks through the repair step by step, in the order a plumber would do it.
1. Find out where the drip is coming from
Start by watching the faucet with the handles fully off. A drip from the end of the spout usually points to a worn cartridge or valve seat inside the faucet body. Water pooling around the base of the faucet, on the other hand, usually means the O-rings that seal the spout to the body have hardened or cracked. Water under the sink points somewhere else entirely, often a loose supply line or a drain connection, and that needs a different repair.
Knowing the source before you buy parts saves a second trip to the store. Take a photo of the faucet brand and model if you can find it, and note whether the faucet has one handle or two. Single-handle faucets almost always use a cartridge, while older two-handle faucets may use compression washers. If you are also dealing with slow drainage at the same sink, our guide at www.easytofix.homes/blog/how-to-unclog-a-drain-without-a-plumber covers safe clearing methods, and our guide at www.easytofix.homes/blog/low-water-pressure-causes-and-fixes explains how a clogged aerator can look like a faucet problem.
2. Shut off the water and protect the drain
Turn off the hot and cold shutoff valves under the sink by turning them clockwise until they stop. Then open the faucet to release any remaining pressure and confirm the water is fully off. If the shutoff valves are stuck or they drip when you turn them, stop there and have them replaced first, because a repair done with live water pressure will flood the cabinet.
Plug the sink drain with a stopper or a rag before you remove any small part. Cartridge clips, screws, and O-rings are small, and once one falls down the drain the repair gets much harder. Lay the parts out in the order you remove them, and take a photo at each stage so reassembly is simple.
3. Replace the cartridge or O-rings
Remove the handle by loosening the set screw, which is usually hidden under a decorative cap or on the underside of the handle. Lift the handle off, remove the retaining nut or clip, and pull the old cartridge straight out. Note its orientation, because many cartridges only fit one way, and installing one backwards can reverse the hot and cold water.
Take the old cartridge with you to the store and match it exactly, or order by brand and model number. For a base leak, replace the O-rings on the spout body instead, coating the new rings lightly with plumber grease so they seat smoothly. Never force a cartridge that does not fit, because a cracked valve body turns a small repair into a full faucet replacement.
- Turn off both shutoff valves and confirm the water is off
- Plug the drain and photograph each step as you disassemble
- Match the old cartridge or O-ring exactly before buying a replacement
- Lubricate new O-rings lightly with plumber grease
- Reassemble in reverse order and tighten gently, not with full force
4. Reassemble and test slowly
Put the faucet back together in reverse order, tightening the retaining nut firmly but without forcing it. Turn the shutoff valves back on slowly, one at a time, and watch the connections under the sink for drips while the faucet is still off. A slow fill gives trapped air a chance to escape and makes a small leak easy to spot before it becomes a puddle.
Run the faucet for a minute, then turn it off and wait. Check the spout tip, the base, and the handle area after five minutes and again after an hour. A repair that looks dry immediately can still seep once the seals settle, so the second check matters. If the drip is gone and the handle moves smoothly, the job is done.
5. Mistakes that turn a small drip into a bigger repair
The most common mistake is overtightening. Cranking down on a handle or a retaining nut can crack a ceramic cartridge or strip the threads in the valve body, and that damage is permanent. Tighten until snug, test, and only then add a small extra turn if there is still a seep. The second mistake is mixing parts between brands, because cartridges that look similar often differ by a fraction of an inch.
Another frequent error is skipping the shutoff test. Homeowners sometimes assume the valves under the sink work, only to discover mid-repair that one valve passes water. Testing the shutoffs first costs two minutes and prevents a flooded cabinet. If a valve will not close fully, replace the valve before touching the faucet.
When to call a licensed plumber
Call a licensed plumber at +18445781727 if the faucet body itself is cracked or corroded, if the shutoff valves under the sink will not close, or if the leak returns within days of a new cartridge. Those signs point to a damaged valve seat, a failing supply line, or water pressure that is high enough to wear parts out early. A plumber can also check the pressure and install a regulator if it is above the safe range.
Also call a professional if the faucet is a high-end or wall-mounted model with no visible fasteners, because forcing those apart without the right tool can damage the finish and void the warranty. A straightforward cartridge repair is a good do-it-yourself job, but a faucet that fights back is telling you it needs professional hands.