Caleb MorganBy Caleb Morgan

Updated November 2026

To repair a dripping Moen faucet, you shut off the water supply, remove the handle and cap, pull out the cartridge, and replace it or its O-rings. Most drips come from a worn cartridge, so this job is often a single part swap. The whole repair usually takes under an hour with basic hand tools.

Before You Start: Shut Off the Water and Gather Tools

Close the shutoff valves under the sink. 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 the remaining water and place a towel in the sink to catch small parts.

Shopping for one? See our guide: Bathroom Moen Faucet Repair: Lever Handle Kit Review (2026).

  • Allen wrench (hex key) that fits the handle set screw
  • Flathead screwdriver and plastic putty knife
  • Replacement Moen cartridge or repair kit matched to your faucet model
  • Plumber’s grease and a clean rag
  • Cartridge puller, if the cartridge is stuck

How to Remove the Handle and Cartridge

Look for a small decorative cap on top of the handle or on the side. Pry it off with a flathead screwdriver or putty knife. Under the cap you will find a set screw. Loosen it with the Allen wrench, then lift the handle straight off.

Unscrew the retaining nut or clip that holds the cartridge in place. Grip the cartridge stem with pliers or a cartridge puller and pull it straight up. If it resists, rock it gently rather than forcing it. Forcing a cartridge can crack the faucet body.

Replace the Cartridge or O-Rings

Compare the old cartridge to the new one before installing it. The stem, height and seat pattern should match. Moen faucets use different cartridge designs across product lines, so buying by model number avoids mismatches.

  1. Clean out any debris or mineral deposits inside the valve body.
  2. Coat the new cartridge’s O-rings with a thin layer of plumber’s grease.
  3. Align the cartridge’s notch with the tab inside the faucet body and press it fully down.
  4. Reinstall the retaining clip or nut, then the handle, set screw and cap.
  5. Turn the water back on slowly and check for drips at the spout and base.

Check the Seat and Other Causes of Dripping

If the drip continues after the new cartridge is in, inspect the valve seats at the bottom of the faucet body. Mineral buildup or nicks can keep the seal from closing. Some owners use a seat wrench to remove and clean them, while others replace the seats when they show visible damage. For other causes, see Moen Kitchen Faucet Dripping: 6 Causes and How to Fix Each One.

Also check whether the handle was closed fully. A handle left slightly open can look like a leaking cartridge.

Common Mistakes to Avoid

  • Skipping the water shutoff, which leads to a sudden spray.
  • Buying a generic cartridge that does not match your Moen model.
  • Overtightening the set screw, which can strip the handle.
  • Forgetting to grease the O-rings, which can cause them to tear on reinstall.
  • Reinstalling the cartridge with the notch misaligned, which keeps it from seating.
  • Plumber’s grease: Helps O-rings slide into place without tearing and keeps seals moving smoothly. View on Amazon
  • Cartridge puller: Gives you a firm grip on a stuck cartridge so you can pull it straight out without damaging the faucet. View on Amazon
  • Hex key set: Covers the range of set screw sizes found on Moen handles. View on Amazon

FAQ

Why does my Moen faucet still drip after replacing the cartridge?

The valve seats may be worn or clogged with mineral deposits. Remove and inspect them, then clean or replace them as needed.

Can I repair a Moen faucet without shutting off the main water?

Often yes, if the sink shutoff valves close fully. If they leak or do not seal, shut off the main supply first.

How do I know which Moen cartridge I need?

Check the faucet model number, usually printed on the packaging or under the sink. Matching the cartridge to that number is the safest option. If you are unsure, consult a plumber for help.

Conclusion

A dripping Moen faucet is usually a worn cartridge or seat, and you can fix it with basic tools and a matched replacement part. Shut off the water, take the faucet apart carefully, and reinstall with fresh grease on the O-rings. If the leak persists, a licensed plumber can check for damage you cannot see.

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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.