How to Fix a Leaky Bathtub Faucet: Stop the Drip

That steady drip is more than a late-night annoyance. Every drop is water you already paid for running straight down the drain.

The Environmental Protection Agency estimates that household leaks waste nearly 10,000 gallons of water a year ⁽¹⁾. Even a slow bathtub drip can send hundreds of gallons, and real money, down the pipe over a season ⁽²⁾.

The good news is that most leaks trace to a single worn part you can swap in about an hour. This guide covers what causes the drip and exactly how to fix a leaky bathtub faucet yourself.

Why Is My Bathtub Faucet Leaking?

Before you grab a wrench, it helps to know the enemy. Almost every bathtub leak comes down to a few common culprits:

• Wear and tear: Rubber washers and O-rings harden and crack with age.
• Mineral build-up: Hard water leaves deposits that stop the parts from sealing.
• Corrosion: Metal parts rust, and a corroded valve seat is a frequent cause of a drip around the spout.
• Loose parts: Daily use gradually loosens packing nuts and screws.

The internal rubber seals usually fail first. They hold back full household water pressure, so even a small crack or a flat spot lets water sneak through as a steady drip.

How Bathtub Faucets Work

To fix the problem, it helps to picture what is happening inside the wall. Bathtub faucets come in four main valve types, and knowing yours points you straight to the right repair.

• Compression: The oldest design. Turning the handle screws a stem in or out, pressing a rubber washer against a metal seat. These need several full turns to shut off and are common on older two-handle tubs.
• Cartridge: A cylindrical cartridge slides or pivots inside the valve body and seals with internal O-rings. It shuts off in a half-turn or less and shows up in both single- and two-handle faucets.
• Ball: A slotted metal ball rotates over the hot and cold inlets. You find it on single-handle faucets that pivot in every direction.
• Ceramic disc: Two polished ceramic disks slide across each other, so there is no rubber washer to wear out. A single lever lifts and rotates a quarter-turn to set flow and temperature.

A quick test tells you which one you have. If the handle needs several full turns to stop the water, it is a compression faucet with a washer and seat. If it stops in a half-turn or less, you have a cartridge, ball, or ceramic-disc valve.

On a compression faucet, that rubber washer is the usual suspect. When it cracks, flattens, or hardens, it can no longer seal against the seat, water squeezes through the gap, and you get a drip. Cartridge, ball, and disc faucets replace a whole cartridge or seal kit instead of a lone washer, but the principle is the same: swap out the worn piece that is supposed to close off the flow.

How To Fix a Leaky Bathtub Faucet

Most bathroom faucets fall into two handle styles:

• Single-handle: Usually a cartridge, ball, or ceramic-disc valve.
• Two-handle: Typically a compression stem (with a washer) or a cartridge.

The steps below focus on the most common repair: replacing the stem or cartridge assembly. On a two-handle faucet, repair both sides at once. If one washer is worn out, the other is not far behind.

Once the water is off, open the faucet to drain any leftover pressure. Important step: place a rag or plug over the bathtub drain. This keeps tiny screws from falling down the pipe and turning a quick fix into a nightmare.

Tools You Need

Gather these items before you start:

• Adjustable wrench or monkey wrench
• Bath socket wrench (essential for recessed stems)
• Seat wrench
• Phillips and flathead screwdrivers
• Replacement parts (washers, O-rings, or new stems)
• White vinegar and a scouring pad

Step-by-Step Repair Guide

Step 1: Expose the Handle Screw

Most handles have a decorative cap marked “Hot” or “Cold.” Use a small flathead screwdriver or a knife blade to gently pry this cap off. This exposes the handle screw.

Step 2: Remove the Handle

Use your Phillips screwdriver to remove the screw in the center of the handle, then pull the handle straight off.

If the handle feels stuck, mineral deposits have likely bonded it in place. Try heating it with a hairdryer or using a handle puller tool. Do not force it too hard, or you risk breaking the plastic components.

Step 3: Remove the Escutcheon

You will likely see a decorative metal trim (the escutcheon) against the wall or threaded onto the valve. Unscrew or pull this off to expose the valve stem.

Step 4: Unscrew the Stem Assembly

Locate the packing nut (sometimes called the stem bonnet). This holds the stem in place. Use a bath socket wrench or adjustable pliers to turn it counter-clockwise, then unscrew it completely once it is loose.

Step 5: Remove the Stem

Grip the stem and pull it out, wiggling it gently if needed. On a cartridge faucet, the entire plastic cylinder slides out. On a compression faucet, you will see a metal stem with a rubber washer at the end.

Step 6: Inspect and Clean

Check the stem for damage. If the brass looks pitted or the plastic is cracked, replace the whole stem.

If the metal still looks good, you may only need new O-rings and a bottom washer. While the parts are out, soak them in vinegar to dissolve mineral buildup, then scrub them clean.

Step 7: Check the Valve Seat

Look inside the hole in the wall where the stem came out. You will see a brass ring called the “seat.” Run your finger over it carefully. If it feels rough or nicked, the seat is damaged.

A damaged seat shreds new washers almost immediately. Use a seat wrench to unscrew the old seat and install a new one, or smooth a lightly corroded seat with a seat-dresser tool.

Step 8: Buy Replacement Parts

Take the old stem and seat to the hardware store and match them exactly. There are dozens of brands and sizes, and “close enough” will not seal.

Step 9: Install New Parts

If you are replacing just the washer:

• Unscrew the small screw at the bottom of the stem.
• Pop off the old washer.
• Fit the new washer and tighten the screw.
• Lubricate the new O-rings with plumber’s grease and slide them onto the stem.

If you bought a whole new stem or cartridge, simply prep it for installation.

Step 10: Reassemble the Faucet

Insert the stem back into the valve body. Thread the packing nut by hand first to avoid cross-threading, then tighten it with your wrench. Do not overtighten; snug is enough.

Step 11: Test the Repair

Put the handle back on temporarily and turn the water supply back on. Twist the handle to flush out any debris, then turn it off and watch for leaks.

Step 12: Finish Up

If the leak is gone, screw the handle back into place and press the decorative cap on. Pat yourself on the back for a job well done.

Pro Tips for Success

• Don’t crank it tight: During daily use, stop turning as soon as the water stops. Overtightening the handle destroys washers quickly.
• Isolate the leak: On a two-handle faucet, feel the temperature of the drip. Warm water means the hot valve is leaking; cold water points to the cold valve.
• Grease it up: Always use heat-proof plumber’s grease on new O-rings and threads. It extends the life of the rubber and makes future removal easier.

FAQs

Why Is My Bathtub Faucet Leaking?

A bathtub faucet leaks when the internal washer or cartridge can no longer form a tight seal. These rubber parts wear down from constant friction, water pressure, and mineral scale. In older faucets, a pitted valve seat can also stop the washer from closing, so the drip continues even after you fit a new washer.

How Hard Is It to Fix a Leaky Faucet?

Fixing a leaky faucet is a beginner-friendly DIY job that most people finish in under an hour. Faucets are built to be serviced with basic tools, usually just a screwdriver and a wrench. The trickiest part is freeing a handle that corrosion has bonded in place; once the handle is off, the rest goes quickly.

Do I Need to Turn My Water off to Fix a Leaky Faucet?

Yes, always shut off the water supply to the tub before loosening any nuts. Removing the valve stem with the water still on sends a geyser into your bathroom and can cause serious water damage. Close the isolation valves near the tub or the main house shut-off, then open the faucet to bleed the pressure.

Why Is My Bathroom Faucet Leaking at the Base?

A leak at the base of the handle points to worn O-rings on the stem body or a loose packing nut. Water travels up the stem past the failed O-ring and pools around the escutcheon. Tightening the packing nut sometimes helps, but replacing the O-rings is the lasting fix.

How Much Does a Plumber Charge to Fix a Leaking Bathtub Faucet?

A plumber typically charges $100 to $300 to fix a leaking bathtub faucet, and a faucet buried behind tile can run higher. That price covers the service call, labor, and parts. Because the parts are cheap, from about $1 for a washer to $85 for a cartridge, doing it yourself saves most of that cost.

Can a Dripping Bathtub Faucet Increase My Water Bill?

Yes, a dripping bathtub faucet raises your water bill, and the waste adds up fast. A faucet that drips just once per second wastes more than 3,000 gallons of water a year, enough for over 180 showers. If it is the hot tap leaking, you also pay to heat all that wasted water.

How Do I Know if I Have a Cartridge or Compression Faucet?

The handle motion gives it away. A compression faucet needs several full turns to go from off to fully on, while a cartridge, ball, or disc faucet shuts off in a half-turn or less. A compression stem also has a visible rubber washer at its tip, whereas a cartridge pulls out as one solid cylinder.

Should I Repair or Replace a Leaky Bathtub Faucet?

Repair the faucet if the valve body is sound and only the washer, O-rings, or cartridge have worn out, which covers most drips. Replace the whole faucet if the body is cracked or badly corroded, if replacement parts are no longer made, or if you want to upgrade to a water-saving model. A repair costs a few dollars in parts, while a full replacement is a larger job.

No More Leaks

Knowing how to fix a leaky bathtub faucet is a genuinely useful homeowner skill. You save money on your water bill, skip the plumber’s call-out fee, and protect the tub from the rust stains a long-running drip leaves behind.

With a few dollars in parts and about an hour of work, you can silence that drip and keep it quiet for years. If the leak returns after a fresh washer and cartridge, the valve seat or the pipe behind it may be damaged, and that is the point to call a plumber.