Bathroom Faucet Is Dripping? How to Find and Stop the Leak

Updated November 2026

If your bathroom faucet is dripping, the cause is almost always a worn washer, O-ring, or valve cartridge that no longer seals against water pressure. This guide shows you how to confirm the source, shut off the water safely, and replace the part that’s failing. Most fixes take under an hour with basic hand tools.

Identify What Type of Faucet You Have

The repair depends on the faucet design, so start by identifying it. Compression faucets have separate hot and cold handles that turn several times to open. Cartridge faucets use a single lever or a pair of handles and contain one removable valve body. Ball faucets use a single dome-shaped cap over a rotating ball. Ceramic-disc faucets are common on newer single-handle models and rarely drip unless debris is trapped inside.

Shopping for one? See our guide: 10 Best Wall Mounted Faucet Bathroom Options for Every Need (2026).

Check whether the drip comes from the spout, or from the handle base. A spout drip usually points to an internal valve problem. Water leaking from around the handle usually means a worn O-ring or packing nut.

Shut Off the Water and Prepare the Work Area

Close the shutoff valves under the sink. Turn them clockwise until snug, then open the faucet to relieve remaining pressure. Place a towel in the sink basin and over the drain. Small parts such as screws, washers, and springs can disappear quickly, so keep them in a labeled cup.

1. Gather a flathead and Phillips screwdriver, an adjustable wrench, a replacement cartridge or washer kit, plumber’s grease, and a rag.
2. Take a photo of the faucet assembly before disassembly so you can match part orientation later.
3. Pry off the decorative cap on the handle, remove the handle screw, and lift the handle off.
4. Unscrew the packing nut or retaining clip to reach the valve body or cartridge.

Replace the Failing Part

Once the valve is exposed, inspect it for mineral buildup, cracked rubber, or pitted brass seats. Compare the old part to the replacement before installing it. Cartridge faucets usually need the entire cartridge swapped, while compression faucets often just need a new washer and seat.

Replacing a Washer or O-Ring

Remove the old washer with a small screwdriver, taking care not to scratch the seat. Coat the new washer and any O-rings with plumber’s grease, then reinstall them in the same orientation. Reassemble in reverse order and tighten the packing nut only until snug, since overtightening can crack the body.

Replacing a Cartridge

Pull the cartridge straight out, noting how it sits in the body. Many cartridges have a locking clip or alignment tab that must match the faucet’s slot. Manufacturers specify exact cartridge models for each faucet line, so confirm the part number before ordering.

Test the Repair and Watch for Leaks

Turn the shutoff valves back on slowly to avoid sudden pressure spikes. Run both hot and cold water, then shut the handle fully. Wait a few minutes and check the spout for a bead of water. If the drip continues, the seat may be damaged, or the cartridge may be installed backward.

Keep in mind that a drip that appears only on the hot side often points to a hot-side cartridge or washer, while one that appears on both sides may involve the stem or handle.

Common Mistakes

• Skipping the shutoff valves and getting soaked when the handle comes off.
• Using a worn or mismatched washer, which will leak again within weeks.
• Forgetting plumber’s grease, which causes O-rings to tear during reassembly.
• Overtightening the packing nut, which can crack brass or plastic components.
• Installing a cartridge without checking its alignment tab, which prevents a full seal.

Recommended Gear

• Plumber’s grease: Keeps O-rings supple and reduces friction during reassembly. View on Amazon
• Faucet repair kit: Bundles common washers, O-rings, and seats so you can match parts without guessing. View on Amazon
• Adjustable wrench: Gives you a secure grip on packing nuts without marring finishes. View on Amazon

For more detailed steps on specific brands, see Repair Dripping Faucet Bathroom: A Step-by-Step Guide for Beginners and Moen Bathroom Faucet Cartridge: 4 Best Replacements Compared (2026). If your leak comes from a tub spout, Bathroom Tub Faucet Dripping: How to Find and Fix the Leak covers that setup. Owners replacing parts on Price Pfister models may also find Price Pfister Bathroom Faucet Parts: Identify, Order and Replace the Right Ones useful.

FAQ

Why does my bathroom faucet keep dripping after I replace the washer?

The valve seat underneath the washer may be pitted or corroded. Inspect it closely, and if it’s damaged, you’ll need a seat wrench or a new valve body.

Can I fix a dripping faucet without turning off the main water?

Yes, closing the sink’s shutoff valves is enough for most bathroom faucets. The main supply only needs to be shut off if those valves are stuck or leaking.

How do I know if the cartridge needs replacing or just cleaning?

Clean the cartridge if the drip is caused by sediment and the rubber parts look intact. Replace it if seals are cracked, the stem feels loose, or the drip returns after cleaning.

Conclusion

A dripping bathroom faucet usually comes down to one worn part, and identifying the faucet type makes the repair straightforward. Shut off the water, replace the washer, O-ring, or cartridge, and test carefully before walking away. If the leak persists or the valve body is damaged, consult a licensed plumber.

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