Repair Dripping Faucet Bathroom: A Step-by-Step Guide for Beginners

Updated November 2026

To repair a dripping faucet in a bathroom, you will identify the type of faucet, shut off the water supply, remove the handle and internal parts, and replace the worn component causing the leak. Most drips come from a worn washer, O-ring, cartridge, or valve seat, and many of these fixes take under an hour with basic hand tools. The steps below show you how to find the source of the leak, prepare the work area, and complete the repair without damaging the fixture.

Why Bathroom Faucets Drip

A faucet drips when water passes through a gap that should be sealed. In most bathroom faucets, that seal is created by a rubber washer, a ceramic disc, a cartridge, or an O-ring that presses against a metal seat. Over months and years, these parts harden, crack, or collect mineral scale from hard water. Once the seal weakens, water slips past it even when the handle is off.

Shopping for one? See our guide: 4 Best Delta Bathroom Faucet Repair Kit Picks for Every Fix.

Knowing which part is failing saves time. A drip from the spout usually points to the inside of the valve, while a leak around the base of the handle or from the top of the faucet usually means an O-ring or packing nut has failed.

Identify Your Faucet Type

Before you order parts, confirm which mechanism your faucet uses. Bathroom faucets generally fall into four categories:

• Compression (two-handle): Uses a rubber washer at the bottom of a stem. Turning the handle lowers the washer onto a valve seat.
• Ball faucet (single-handle): Uses a rotating metal ball with rubber seals and springs.
• Cartridge faucet (single or two-handle): Uses a sealed cylinder that controls flow and temperature. Many modern single-handle faucets use this design.
• Ceramic disc faucet: Uses two ceramic discs that slide over each other. These rarely drip, but when they do, the cartridge is usually the fix.

Look up the brand and model, often printed on the underside of the sink, the spout base, or the handle cap. Manufacturers usually publish exploded diagrams that name each part, which makes ordering replacements far easier. For brand-specific guidance, see Fix Moen Bathroom Faucet: A Practical Guide (2026) or Bathroom Faucet Repair Kits: How to Fix a Leaky Faucet in 6 Steps.

Tools and Supplies You Will Need

Gather everything before you shut off the water so you are not hunting for a tool with the supply line closed.

1. Adjustable wrench or basin wrench
2. Phillips and flathead screwdrivers
3. Allen (hex) key set, often needed for handle set screws
4. Replacement washers, O-rings, or cartridge matching your model
5. Plumber’s grease (silicone-based is safest for rubber parts)
6. Soft cloth to protect the finish and a small bowl for screws
7. White vinegar and an old toothbrush for mineral scale
8. Towel or rag placed in the sink drain to catch dropped parts

Step-by-Step: Repairing the Dripping Faucet

Step 1: Shut Off the Water Supply

Locate the two shutoff valves under the sink, one for hot and one for cold. Turn them clockwise until they stop. If the valves are stiff or do not close fully, shut off the main water supply to the house. Then open the faucet to drain remaining water and relieve pressure.

Step 2: Remove the Handle and Cover

Pry off the decorative cap on the handle with a flathead screwdriver or a fingernail, taking care not to scratch the finish. Remove the screw underneath and lift the handle off. On some models, a hex set screw on the side of the handle must be loosened first. Keep track of the order of parts as you remove them. Taking a photo with your phone is a simple way to avoid confusion during reassembly.

Step 3: Remove the Stem, Cartridge, or Valve

For compression faucets, unscrew the stem with an adjustable wrench, then inspect the rubber washer at the bottom. For cartridge faucets, remove the retaining clip or nut and pull the cartridge straight up. For ball faucets, remove the cap, lift out the ball, and check the seats and springs. Lay the parts out in the order removed.

Step 4: Inspect and Clean Each Component

Check washers for cracks, flattening, or missing pieces. Look at O-rings for flattening or tears. Run a fingernail across the valve seat; grooves or pitting mean the seat may need replacement. Soak scaled parts in white vinegar for 30 minutes and scrub with an old toothbrush. Do not use steel wool on finished surfaces.

Step 5: Replace the Worn Parts

Match replacements exactly by size and shape. Take the old part with you to the store or compare it against the manufacturer’s diagram. Lightly coat new O-rings and washers with plumber’s grease before installing them. Insert cartridges so the alignment tabs sit in the correct slots.

Step 6: Reassemble and Test

Reverse the removal steps. Tighten screws snugly without overtightening, which can crack plastic or strip threads. Turn the water supply back on slowly, then test the faucet by running it through a full range of temperatures and by closing the handle completely. Check under the sink for leaks at connections.

Common Causes and Fixes at a Glance

Symptom	Likely Cause	Typical Fix
Drip from spout when handle is off	Worn washer or valve seat	Replace washer; resurface or replace seat
Leak around base of handle	Worn O-ring or packing	Replace O-ring or packing nut seal
Dripping only on hot side	Failed hot-side cartridge or washer	Replace hot-side part
Dripping after recent repair	Debris or misaligned cartridge	Flush valve, reseat cartridge, reassemble
Constant slow drip with mineral buildup	Scale on seat or cartridge	Soak in vinegar; replace if pitted

Recommended gear

A repair kit matched to your faucet brand saves time because it bundles the most commonly failing parts. Look for kits organized by manufacturer, since generic washers often fit poorly.

• Brand-matched repair kit: Bundles washers, O-rings, and springs for a specific faucet line, reducing the risk of ordering the wrong size. View on Amazon
• Replacement cartridge: A single-handle faucet that drips even after cleaning usually needs a new cartridge rather than individual seals. View on Amazon
• Plumber’s silicone grease: Lubricates O-rings and washers to prevent tearing and help the faucet operate smoothly. View on Amazon

Common Mistakes

• Skipping the shutoff valves and getting soaked when the handle comes off.
• Buying generic washers without checking the exact dimensions or manufacturer part number.
• Overtightening the handle screw, which can crack the handle or strip the threads.
• Forgetting to reinstall parts in the correct order, especially springs and small seals.
• Using petroleum-based lubricant on rubber parts, which can cause them to swell and fail.
• Replacing the washer while ignoring a damaged valve seat, leading to a drip within weeks.

Tips for a Lasting Repair

• Clean the aerator at the spout tip every few months to remove sediment that can affect flow.
• If your home has hard water, schedule periodic scale removal to extend part life.
• Replace worn parts in pairs when both hot and cold sides show wear.
• Keep the old parts until the faucet has run leak-free for several days, in case you need to compare them again.
• If the faucet is decades old and parts are no longer available, replacing the entire faucet may be more practical than repeated repairs. For options, see Kohler Widespread Bathroom Faucet: 5 Best Picks Compared (2026) or Single Handle Bathroom Faucet Moen Review: Key Features Explained.

When to Call a Professional

If the valves will not shut off, if you see water damage or soft flooring beneath the sink, or if the faucet connects to plumbing you are unsure about, consult a licensed plumber. Fixing a hidden leak in supply lines or behind walls is outside the scope of a simple faucet repair.

FAQ

How do I know if my bathroom faucet needs a new washer or cartridge?

A compression faucet that drips from the spout usually needs a washer. A single-handle faucet that drips even when the handle is fully closed usually needs a cartridge or valve seat repair.

Can I repair a dripping faucet without turning off the water to the house?

Yes, in most cases. Closing the individual hot and cold shutoff valves under the sink is enough for a faucet repair.

Why does my faucet keep dripping after I replaced the washer?

The valve seat is often pitted or scaled, so the new washer cannot seal properly. Clean the seat or replace it.

How long does a bathroom faucet repair usually take?

A simple washer or O-ring replacement often takes 20 to 45 minutes. Cartridge replacements may take an hour, especially on first attempts.

Should I use plumber’s grease on all faucet parts?

Use it on rubber washers, O-rings, and cartridge seals. Avoid getting grease on threads that a manufacturer says should stay dry, and check the diagram or instructions.

Is a dripping faucet a waste of water?

Yes. A steady drip can waste a meaningful amount of water over a year, which is why prompt repair is worthwhile even when the leak seems small.

Can hard water cause a faucet to drip?

Yes. Mineral deposits can prevent washers and seats from sealing, so periodic cleaning and softening of the water can extend the life of the repair.

Conclusion

A dripping bathroom faucet is usually caused by a worn washer, O-ring, cartridge, or valve seat, and most fixes require only basic tools. Shut off the water, identify your faucet type, replace the failing part with an exact match, and test carefully before closing the cabinet. With a careful approach, you can stop the drip and avoid the waste it causes.

Related reading

• Bathroom Tub Faucet Parts: Identify, Repair and Replace Each One
• Bathroom Faucet Stopper Repair: A Practical Guide (2026)

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