Fix a Leaking Shower Faucet

A dripping shower faucet is one of those small annoyances that becomes expensive fast. A single drip per second wastes about 3,000 gallons a year, and your water bill will feel it. The good news is that the fix is almost always straightforward—the leak lives inside the valve body, usually from a worn cartridge or compression washer that cost a few dollars to replace. You don't need a plumber for this, and you don't need special skills. What you need is the right part for your faucet, a little patience, and about thirty minutes on a Saturday morning. The hardest part is identifying which type of valve you have so you order the correct cartridge. Once you've got that sorted, the repair is methodical and forgiving. You turn off the water, take apart the handle, slide out the old part, drop in the new one, and turn the water back on. Done right, your shower will be silent again.

1. Identify your faucet type and find the cartridge model. Look under the sink at the valve body and note the manufacturer—Moen, Kohler, Delta, or Pfister are most common. Check for a brand name or logo stamped on the trim ring. Take a photo and bring it to your hardware store, or search the manufacturer's website with your faucet's model number (usually stamped on the body). Buy the correct replacement cartridge for your exact model before you start. Using the wrong cartridge wastes time and leaves you with a non-functional faucet.
2. Turn off the water supply. Locate the shutoff valves under the sink or at the main water panel. Turn both the hot and cold valves clockwise until they stop. Turn on the shower to confirm the water is off—you should hear nothing and feel nothing from the faucet. This prevents water from spilling into the wall cavity while you work.
3. Remove the handle and trim ring. Look for a small screw or set screw on the handle itself—it's often hidden under a decorative cap or flush with the side of the handle. Remove it with an Allen wrench or screwdriver. Unscrew the trim ring (the decorative collar behind the handle) by hand or with a strap wrench if it's tight. Set all small parts in a cup so you don't lose them.
4. Extract the old cartridge. Behind the trim ring, you'll see the cartridge—a cylindrical or rectangular plastic or brass piece with a stem sticking out. Some cartridges have a cartridge puller clip or collar you must remove first. Grip the cartridge stem firmly with a cartridge puller tool (rent one if you don't own it) or needle-nose pliers and pull straight out with steady, even pressure. It may require significant force. Once it's out, inspect it for mineral buildup, cracking, or a hardened rubber seal.
5. Clean the valve cavity and install the new cartridge. While the cartridge is out, use a clean cloth to wipe out any sediment, mineral deposits, or debris inside the valve body. Look for small rubber seals or O-rings still stuck inside—remove them carefully. Insert the new cartridge straight into the cavity, aligning the stem with the notch in the body. Push it in firmly until it seats completely and the stem is flush or just slightly proud of the body. Replace any O-rings or seals that came with the new cartridge according to the kit instructions.
6. Reassemble the trim ring and handle. Screw the trim ring back onto the faucet body by hand, then tighten it snugly with a strap wrench. Don't over-tighten—the ring should be secure but not crushing. Reinstall the handle, aligning it to point straight down when the water is off. Insert and tighten the set screw. Replace any decorative caps. The handle should move smoothly from off to hot to cold without binding.
7. Turn the water back on and test. Turn the shutoff valves back on slowly, one at a time, and listen for any unusual sounds or hissing. Turn on the shower and let it run for thirty seconds. Check for leaks around the handle, trim ring, and showerhead. Run it hot, cold, and mixed. The faucet should switch smoothly and stop completely with no drip when turned fully off. If it still drips, the cartridge may be installed backwards or not fully seated—turn off the water and reseat it.