How to fix a leaky bathtub faucet
A constant drip almost always traces to one worn part. Identify your valve type, swap the cartridge or washer, and stop the leak in an afternoon.
Written by Illyrian Plumber
Expert ReviewedLicensed Master Plumbers
NJ Licensed Master Plumber | 10+ Years Experience | Serving Middlesex County, NJ
A bathtub faucet that drips after you shut it off is wasting water around the clock, and the fix is usually a single worn part that costs a few dollars. Whether you have an older two-handle valve or a modern single-handle cartridge, the repair follows the same path. If you would rather not open up the valve, or the leak is coming from inside the wall, our faucet and fixture installation team handles it across Middlesex County. This guide shows how to fix a leaky bathtub faucet step by step.
Set aside an hour, pick up a repair kit that matches your faucet brand, and have the worn part out before your trip to the hardware store so you can match it exactly.
About Illyrian Plumber
Licensed master plumbers serving Middlesex County, NJ since 2010. We handle faucet and fixture installation, bathroom remodeling, water leak detection, and 24/7 emergency plumbing across East Brunswick, Edison, Sayreville, Old Bridge, Monroe Township, South Brunswick, and North Brunswick.
What causes a leaky bathtub faucet
A faucet seals the water with a soft, movable part that presses against a fixed surface. Over years of use that part wears, and water seeps past it as a drip. Which part depends on your valve type.
- Compression (two handles): a rubber washer and the valve seat wear out. The oldest and most common style in older homes.
- Cartridge (single or double handle): a replaceable cartridge controls flow and temperature. When it wears, the spout drips.
- Ball and ceramic disc: internal seals or the disc wear. Repair kits are brand specific.
Step 1: Shut off the water and prep
Bathtubs rarely have local shutoff valves, so you will usually close the main supply. Our guide on how to shut off the water to your house shows exactly where to find the main valve.
- Close the main water valve, then open the tub faucet to drain the line and confirm the water is off.
- Cover the tub drain with a rag so small screws and parts cannot fall in.
- Lay out a towel and keep the parts in order as you remove them so reassembly is easy.
Step 2: Replace the cartridge or washer
Remove the handle
Pry off the decorative cap, remove the screw underneath, and pull the handle straight off. If it is stuck from mineral buildup, a handle puller helps. Then unscrew the trim sleeve or escutcheon to expose the valve.
Pull the worn part
For a cartridge faucet, remove the retaining clip or nut and pull the cartridge straight out with pliers or a cartridge puller. For a compression faucet, unscrew the stem and remove the washer and screw at the bottom, and inspect the seat for pitting.
Match and install the new part
Take the old cartridge or washer to the store to match it exactly, or use the faucet model number. Coat O-rings with plumber's grease, insert the new part in the same orientation, and reassemble in reverse order. Reseat a worn valve seat or use a seat-dressing tool if needed.
Test for leaks
Turn the main water back on slowly, then run the faucet and watch the spout for drips and the handle for seepage. Open the highest faucet in the house first to clear trapped air, as covered in the shutoff guide above.
Leak coming from behind the wall?
That is a job for a licensed plumber. We serve all of Middlesex County.
When to call a plumber
Replacing a washer or cartridge is a confident do-it-yourself repair. Call a licensed plumber if the leak is behind the wall instead of at the spout, if the valve body or supply pipe is corroded, if you see water stains on the ceiling below the tub, or if the shutoff will not fully stop the water. These signal a problem inside the wall.
A leak you can hear but not see should be traced quickly. Our water leak detection service pinpoints hidden leaks without opening walls, and if you are already planning updates, our bathroom remodeling team can replace an aging valve assembly entirely.
Frequently asked questions
Why does my bathtub faucet drip after I shut it off?
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A constant drip from the spout means the part that seals the water flow has worn out. In an older two-handle faucet it is usually a rubber washer or seat. In a single-handle faucet it is the cartridge. Mineral-heavy water in many Middlesex County homes wears these parts faster. Replacing the worn component stops the drip, and the repair is inexpensive compared to the water it wastes.
How do I know if I have a compression, cartridge, or ball faucet?
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Two separate handles for hot and cold usually mean a compression or washer-style valve that uses rubber washers. A single handle that moves up and down and side to side is a cartridge or ball faucet. The exact cartridge varies by brand, so the most reliable approach is to remove the old one and match it at the store or look up the faucet model number.
Can a dripping faucet really raise my water bill?
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Yes. A faucet dripping once per second wastes more than 3,000 gallons a year, according to the US EPA, which adds up on both the water and the sewer portion of your bill. A hot-water drip wastes energy too, since the water heater keeps reheating water that goes down the drain. Fixing a drip quickly pays for the cheap replacement part many times over.
When should I call a plumber for a leaky tub faucet?
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Call a plumber if the leak comes from behind the wall rather than the spout, if the valve body or pipe is corroded, if water stains appear on the ceiling below the tub, or if the shutoff valves will not stop the water. These point to a problem inside the wall that needs a licensed plumber, and a hidden leak should be found and repaired before it damages framing and drywall.
Faucet leak you would rather not chase?
Our licensed plumbers repair and replace tub, shower, and sink faucets across East Brunswick, Edison, and all of Middlesex County, NJ.