Caleb MorganBy Caleb Morgan

Updated November 2026

To repair a leaking tub faucet, you shut off the water, remove the handle and trim, identify the failed part, and replace it with a matching washer, O-ring, seat or cartridge. Most drips come from worn rubber parts or a corroded valve seat, and a basic set of tools is usually enough to fix them in an afternoon. The steps below cover how to find the source of the leak and complete the repair.

Identify the Source of the Leak

Before you take anything apart, figure out where the water is coming from. A drip from the spout after the handle is closed usually points to a worn washer, a compression seat or a cartridge that is no longer sealing. Water leaking around the handle or from the base of the handle usually means a worn O-ring or packing nut. Water coming out of the showerhead when the tub spout is in use points to a diverter that is stuck or worn.

Shopping for one? See our guide: 7 Best Leaking Tub Faucet Repair Kits for Common Drips (2026).

Shut Off the Water and Disassemble the Faucet

Turn off the water supply valves for the tub, or the main shutoff if the valves are stiff or missing. Open the tub faucet briefly to drain any remaining water and relieve pressure. Then work through the disassembly:

  1. Pry off the decorative handle cap with a flat-blade screwdriver or a thin putty knife, wrapping the tip in tape to protect the finish.
  2. Remove the handle screw and lift the handle off the stem.
  3. Unscrew the escutcheon (the trim plate) and the packing nut using an adjustable wrench or a deep socket.
  4. Pull out the stem or cartridge. Note the orientation of every part before removing it, or take photos as you go.

Lay the parts out in order on a towel so you can reassemble them correctly.

Replace the Worn Parts

Inspect each component. Compression stems usually have a rubber washer at the bottom and an O-ring around the stem. Replace both, and check the brass valve seat inside the tub body for pitting or grit. If the seat is rough, use a seat wrench to remove it and install a new one. Cartridge-style faucets need the whole cartridge replaced if the seals are worn, since the parts are not sold separately on most models. Match the replacement to the brand and model, because washer sizes and thread patterns differ between manufacturers. Manufacturers such as Delta, Moen and Kohler list the correct part numbers in their owner manuals and on their websites.

Apply a light coat of plumber’s grease to new O-rings and washers before installing them. This helps them seat without tearing and makes future disassembly easier.

Reassemble and Test

Reverse the disassembly steps. Tighten the packing nut snugly but do not overtighten it, since that can crack the stem or make the handle hard to turn. Restore the water supply slowly, then turn the handle to both hot and cold and check for drips at the spout, the diverter and the base of the handle. If the spout still drips, the seat may need further work or the stem may be installed backward.

  • Plumber’s grease helps new O-rings seat smoothly and keeps them from tearing during reassembly. View on Amazon
  • Tub faucet seat wrench set lets you remove and replace worn brass valve seats without damaging them. View on Amazon
  • Adjustable wrench provides the grip needed to loosen packing nuts without scratching the finish. View on Amazon

Common Mistakes to Avoid

  • Skipping the water shutoff. Even a small amount of pressure can spray water across the bathroom.
  • Buying generic washers without checking the brand and model. Mismatched parts often leak again within weeks.
  • Overtightening the packing nut, which can crack the stem or stiffen the handle.
  • Ignoring a pitted valve seat. A new washer will not stop a drip if the seat underneath is damaged.
  • Forgetting to note the stem orientation, which can cause the handle to run backward.

FAQ

Do I need to replace the whole tub faucet to fix a drip?

In most cases, no. A worn washer, O-ring, seat or cartridge can be replaced individually, which is far less work than installing a new faucet.

How long does a tub faucet repair usually take?

For a first-time repair, plan on roughly one to two hours, including shutting off the water and testing the result. Experienced DIYers often finish faster.

When should I call a professional plumber?

If the valve body is corroded, the stem will not come out, or water is leaking inside the wall, consult a licensed plumber. Hidden leaks can cause water damage that needs professional assessment.

Conclusion

A leaking tub faucet can usually be repaired by identifying the failed part, replacing it with a matching component, and testing the result. Taking photos during disassembly and shutting off the water first will save time and prevent mistakes. With the right replacement parts, most drips stop for good.

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Caleb Morgan

About Caleb Morgan

Caleb Morgan is part of our editorial team and reviews and edits our kitchen faucets & sinks guides, checking product details against manufacturer specifications and owner feedback.