A faucet that won’t stop dripping is more than an annoying sound. It can stain sinks, swell cabinet floors, and quietly waste a lot of water. In fact, the U.S. EPA notes that common household leaks can add up to nearly 10,000 gallons of water wasted per year in the average home, and dripping faucets are a frequent culprit (EPA source).

This leaky faucet repair guide walks you through the fastest, most beginner-friendly way to find the cause, make the right fix, and stop the drip for good (without turning your kitchen into a plumbing project).

Before you start: 3 things that prevent 90% of DIY mistakes

1. Clear the sink and plug the drain. Small screws and clips love to disappear.

2. Protect the finish. Lay down a towel so tools don’t chip porcelain or scratch stainless.

3. Know how to stop water quickly. If you’re not sure where your shutoffs are, skim FixHome Guides’ beginner plumbing triage first: Home repair plumbing: the beginner troubleshooter.

Step 1: Identify exactly where the leak is coming from

Different leak locations point to different parts. Spend 60 seconds here, it saves you from buying the wrong cartridge or tearing down the wrong handle.

Quick symptom-to-fix map

If your issue is not a drip but a spray pattern or sideways jets, skip ahead to “Clean the aerator” first.

Step 2: Figure out what type of faucet you have (so you buy the right part)

You don’t need to become a plumber, but you do want to match the repair to the mechanism.

Tip: Take a photo of the faucet and the handle area before disassembly. If you end up needing a replacement cartridge, that photo helps you match parts at the store.

Tools and supplies (simple, renter-safe)

Most leaky faucet repair jobs can be done with:

• Adjustable wrench or tongue-and-groove pliers
• Phillips and flathead screwdriver
• Allen key set (many handles use a tiny set screw)
• Old toothbrush and a rag
• White vinegar (for mineral buildup)
• Silicone plumber’s grease (not petroleum jelly)
• Replacement parts (washer/O-ring/cartridge) matched to your faucet

Optional but helpful: a headlamp, a small tray for screws, and painter’s tape to label hot/cold.

Step 3: Shut off water the right way (and avoid a surprise spray)

• Turn both under-sink shutoff valves clockwise until they stop.
• Open the faucet to relieve pressure.
• Place a rag under the supply connections.

If a shutoff valve won’t turn, don’t force it. That is a common way to create a bigger leak. In a rental, that’s a stop point and a landlord call.

Fix #1 (fast win): Clean the aerator and flush debris

If your faucet drips intermittently, sputters, or has a weird spray pattern, the aerator can be part of the problem (and it’s the easiest fix).

1. Unscrew the aerator at the tip of the spout (use a rag to protect the finish).
2. Soak it in vinegar for 20 to 60 minutes.
3. Scrub with a toothbrush, rinse, and reassemble.
4. With the aerator still off, briefly turn the water on to flush grit out of the line.
5. Reinstall the aerator.

If the spout still drips when fully off, move to the valve/cartridge fixes below.

Fix #2: Drip from the spout (single-handle cartridge faucet)

This is one of the most common modern setups. The most common “real fix” is replacing the cartridge.

Step-by-step

1. Remove the handle. Look for a small set screw (often on the back/underside). Loosen it with an Allen key, then lift the handle off.

2. Remove the trim and retaining hardware. You may see a retaining nut or a clip holding the cartridge in place.

3. Pull the cartridge straight out. Wiggle gently. If it’s stuck from mineral buildup, slow rocking pressure helps. Avoid prying against the sink or countertop.

4. Match and replace. Bring the old cartridge to the store to match it. Install the new cartridge in the same orientation.

5. Reassemble and test. Turn shutoffs back on slowly and test for:

• No dripping from the spout
• No handle-area seepage
• Normal hot/cold function

Two beginner tips that make this go smoothly

• Take a picture before pulling the cartridge. Orientation matters.
• Use silicone plumber’s grease lightly on O-rings (if present) so seals seat without twisting.

Fix #3: Drip from the spout (two-handle compression faucet)

If your handles tighten down and the drip stops only when you really crank it, you likely have a worn washer.

Step-by-step

1. Shut off both valves under the sink.
2. Remove the handle (usually a screw under a cap).
3. Use a wrench to remove the packing nut and pull out the stem.
4. Replace the rubber washer at the end of the stem (often held by a small screw).
5. Inspect the valve seat (inside the faucet body). If it’s rough or pitted, it can ruin new washers quickly.
6. Reassemble, turn water back on slowly, and test.

If you replace the washer and it still drips, the valve seat may be damaged or corroded enough to require a special seat tool or a pro.

Fix #4: Leak around the handle

If water appears around the handle when you turn the faucet on or off, it’s often a seal issue, not the spout.

Try this in order:

1) Snug the packing nut (small adjustment)

With water off, tighten the packing nut just a little (think: 1/8 turn). Over-tightening can make the handle hard to turn and wear parts faster.

2) Replace the O-ring or handle seal

If snugging doesn’t help, remove the handle and inspect for a cracked or flattened O-ring. Replace with the same size, then add a small amount of silicone plumber’s grease.

Fix #5: Leak at the faucet base (swivel spout)

If water pools around the base when you move the spout side-to-side, the spout O-rings are usually worn.

1. Shut off water.
2. Remove the spout (method varies, some lift off after removing a clip).
3. Replace O-rings with identical sizes.
4. Lubricate lightly with silicone plumber’s grease.
5. Reassemble and test.

Fix #6: Leaks under the sink (don’t ignore these)

A dripping spout is annoying. A slow leak under the sink is how you end up with warped cabinet floors and hidden mold.

Common under-sink leak points

• Supply line nut at shutoff valve: Tighten gently with a wrench while holding the valve body steady.
• Supply line nut at faucet: Tighten gently.
• Shutoff valve stem (packing nut): If the valve leaks around the stem when you turn it, a slight snug on the packing nut can help.
• Old braided supply lines: If the line itself is sweating, bulging, or dripping, replacement is the correct fix.

If a shutoff valve won’t fully close, or starts leaking after you touch it, stop and call for help. In rentals, document with photos and notify your landlord.

Common mistakes that make a drip come back

• Over-tightening connections. Many faucet parts seal with rubber, not brute force.
• Skipping the cleaning step. Grit and mineral scale can prevent a new seal from seating.
• Using the wrong grease. Use silicone plumber’s grease, not petroleum products.
• Not matching parts exactly. Cartridges and washers can look similar but seal differently.

When to call a plumber (or your landlord)

DIY leaky faucet repair is very doable, but pause if you see any of these:

• Water damage, soft cabinet floor, or suspected mold
• A shutoff valve that is seized, corroded, or won’t stop water
• A faucet body that looks cracked
• Leaks that appear to be coming from behind the wall
• You live in an older home where disturbing plumbing can create new failures

If you’re weighing “DIY vs call someone,” FixHome Guides has a practical framework here: Repairs at home: what to fix first.

A simple “stop the drip for good” checkout

After reassembly:

• Run hot and cold for 30 seconds each.
• Turn off and watch the spout for 2 full minutes.
• Wipe under the sink dry, then check again in 10 minutes.

If everything stays dry, you’re done.

One last mindset tip: keeping parts organized and following a clear step-by-step system is what makes repairs repeatable, whether it’s a faucet or a complex modular product in another industry. That same “everything in its place” approach is why some teams prefer an all-in-one modular platform for their software operations.

Frequently Asked Questions

Why is my faucet still dripping after I replaced the washer? The valve seat may be pitted or mineral-damaged, or debris may be preventing a full seal. Clean the seat area and confirm the washer size matches exactly.

Do I need plumber’s tape (PTFE tape) to fix a dripping faucet? Usually not for a spout drip. PTFE tape helps seal threaded connections (like some supply line threads), but most faucet drips are caused by worn internal seals or cartridges.

Is a leaky faucet an emergency? A slow spout drip is rarely an emergency, but it can waste water and build up stains. A leak under the sink can damage cabinets and flooring quickly, treat that as urgent.

What if I can’t find the exact cartridge for my faucet? Bring the old cartridge (and a photo of the faucet) to a hardware store. If the faucet brand is unknown or discontinued, consider replacing the faucet, especially if multiple parts are failing.

I’m a renter. Can I repair a leaky faucet myself? Many landlords allow simple, reversible fixes like replacing an aerator or cartridge, but policies vary. If you are unsure, take photos, keep the old parts, and get written approval for anything beyond basic maintenance.

Want the simplest version of this, with visuals?

If you’d rather follow a clean, step-by-step checklist with diagrams (instead of juggling browser tabs mid-repair), FixHome Guides offers beginner-friendly digital repair guides designed to be mobile-ready and renter-safe.

Get instant access at FixHome Guides and knock out the drip with confidence (and without calling a contractor).