Caleb MorganBy Caleb Morgan

Updated November 2026

To repair a leaking bathtub faucet, you shut off the water, remove the handle and trim, and replace the worn part inside the valve, which is usually a cartridge, a stem or a set of washers. Most homeowners can finish the job in one to two hours with a screwdriver, an adjustable wrench and a replacement part that matches the faucet brand. The steps below apply to most single-handle and two-handle tub faucets.

Identify the Type of Faucet Before You Start

The repair depends on the valve inside the wall. A single-handle faucet almost always uses a cartridge, while older two-handle faucets typically use compression stems with rubber washers. Check the brand name on the handle or spout, then look up the model number so you buy the correct part. Guides such as Delta Bathtub Faucet Cartridge: How to Replace One in 6 Steps cover cartridge-specific details if your faucet uses one.

Shopping for one? See our guide: 6 Best Leaking Bathtub Faucet Repair Kits for Common Leaks (2026).

How to Repair a Leaking Bathtub Faucet: Step-by-Step

Work through these steps in order. Keep the drain closed so small screws and parts do not disappear down it.

  1. Turn off the water supply at the main shutoff or at the access panel behind the wall. Open the tub faucet briefly to drain any remaining water.
  2. Pry off the decorative cap on the handle with a flathead screwdriver or a small knife. Remove the handle screw and lift the handle off.
  3. Unscrew the trim sleeve or escutcheon. Use a wrench wrapped in tape to protect the finish.
  4. Remove the retaining nut or clip that holds the cartridge or stem in place. Pull the cartridge straight out, noting its orientation.
  5. Take the old part to a hardware store or match it to the manufacturer’s model number, then install the new cartridge or washers in the same position.
  6. Reassemble in reverse order, turn the water back on slowly, and test both hot and cold settings for drips.

Diagnose the Source of the Leak

A leak from the spout usually means a worn cartridge or stem, while a leak from the showerhead when the diverter is off points to a faulty diverter valve. Water dripping behind the wall or around the handle often indicates a failed seal or O-ring. Use this quick reference to match symptoms to parts.

Symptom Likely cause Fix
Drip from spout when off Worn cartridge or washer Replace cartridge or washers
Leak from showerhead when tub is running Failed diverter Replace diverter valve or kit
Water around handle base Worn O-ring Replace O-ring or seal
Stiff or hard-to-turn handle Mineral buildup Clean or replace cartridge

Tips for a Lasting Repair

  • Photograph each step before you disassemble so reassembly is straightforward.
  • Use plumber’s grease on O-rings and cartridge seals to prevent tearing.
  • Do not overtighten the retaining nut, which can crack the valve body.
  • Replace the cartridge and seals together if the faucet is more than a few years old.
  • Check the supply lines and shutoff valves if you notice a drop in water pressure after the repair.

A few tools make this job easier and reduce the risk of scratching the finish.

  • Plumber’s grease helps seals slide in smoothly and last longer. View on Amazon
  • Cartridge puller tool lets you remove a stuck cartridge without damaging the valve body. View on Amazon
  • Basin wrench reaches tight spots behind the tub when you need to loosen fittings. View on Amazon

FAQ

How long does it take to repair a leaking bathtub faucet?

Most people finish in about one to two hours, depending on how stuck the parts are and whether you need to remove the trim from tile.

Do I need to replace the whole faucet?

Usually no. Replacing the cartridge, stem or washers fixes most leaks, though very old or corroded valves may need a full replacement.

When should I call a professional plumber?

Call a licensed plumber if the valve is seized, the pipes are corroded, or water is leaking inside the wall. Consult a professional before working on any gas or electrical connections near the tub.

Conclusion

Once you identify the faucet type and replace the worn cartridge, stem or washers, a leaking bathtub faucet is usually fixed for good. Keep the replacement part number on hand for future repairs. With careful reassembly and proper testing, the drip should stop for years.

Ready to choose one?

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.