That slow drip is not just annoying, it can waste hundreds of gallons a month and stain your sink. The good news is that learning how to fix a leaky bathroom faucet with two handles is one of the most beginner-friendly plumbing repairs there is, and it usually costs under $15 in parts. Two-handle faucets almost always leak because a worn rubber washer, O-ring, or cartridge inside one of the handles has given out. Track down which handle is dripping, replace the cheap part inside, and the drip stops. Here is the step-by-step.
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- Step 1: Shut Off the Water
- Step 2: Identify Your Valve Type
- Step 3: Remove the Handle
- Step 4: Fix a Compression Faucet
- Step 5: Fix a Cartridge Faucet
- Step 6: Reassemble and Test
- Tools and Parts You Will Need
- Diagnosing Which Handle Is Leaking
- Common Mistakes That Cause Repeat Leaks
- How Much a Two-Handle Repair Costs
- When to Call a Plumber
Step 1: Shut Off the Water
Never start until the water is off. Look under the sink for two small shutoff valves, one for hot and one for cold, and turn them clockwise until they stop. If there are no under-sink valves, shut off the main water supply to the house. Then open both faucet handles to drain the lines and relieve pressure. Finally, close the sink stopper or lay a rag over the drain so no small screws or springs disappear down the pipe.
Step 2: Identify Your Valve Type
Two-handle faucets come in two main flavors, and the fix differs slightly for each. Knowing which you have saves a wasted trip to the store.
- Compression faucets: Older style. The handle screws down onto a rubber washer to stop flow. If the handle turns several rotations and gets firm at the end, it is likely compression. These leak when the washer wears out.
- Cartridge (washerless) faucets: Newer style. Each handle controls a cartridge that turns roughly a quarter to a half turn. These leak when the cartridge or its O-rings fail.
A dripping spout usually means a bad washer or cartridge; water leaking around the base of a handle usually means a worn O-ring or packing.
Step 3: Remove the Handle
Most handles have a decorative cap on top hiding a screw. Pop the cap off with a flathead screwdriver or utility knife, then remove the screw underneath. Lift the handle straight up. If it is stuck from mineral buildup, wiggle gently or use a handle puller rather than prying hard, which can crack the fixture. Work on one handle at a time so you keep the parts in order.
Step 4: Fix a Compression Faucet
Under the handle you will find a packing nut. Loosen it with an adjustable wrench and unscrew the stem assembly. At the bottom of the stem is a rubber seat washer held by a small brass screw. This flattened, cracked washer is almost always your culprit. Remove the screw, swap in an identical new washer, and reassemble. While you are in there, check the O-ring on the stem and replace it too, since a fresh one prevents leaks around the handle base. Bring the old parts to the hardware store to match sizes exactly.
If the washer keeps failing quickly, the valve seat itself may be pitted. A seat wrench lets you remove and replace it, or a seat-dressing tool can grind it smooth.
Step 5: Fix a Cartridge Faucet
On a cartridge faucet, after removing the handle you will see a retaining clip or nut holding the cartridge in place. Pull the clip with needle-nose pliers or unscrew the nut, then pull the cartridge straight out. Note its orientation, since it must go back the same way. Take it to the store and buy an exact replacement, or just replace the O-rings if they are the only damaged part. Coat the new cartridge or O-rings lightly with plumber’s grease, seat it fully, and secure the clip.
Step 6: Reassemble and Test
Put everything back in reverse order: stem or cartridge, packing nut or retaining clip, handle, screw, and decorative cap. Do not overtighten, which can crack plastic parts or crush the new washer. Turn the shutoff valves back on slowly, then run both hot and cold to flush any debris. Watch the spout and handle bases for a few minutes. A properly reassembled faucet should be bone dry.
Tools and Parts You Will Need
- Adjustable wrench and slip-joint pliers
- Flathead and Phillips screwdrivers
- Replacement washers, O-rings, or a matching cartridge
- Plumber’s grease and white vinegar for cleaning mineral deposits
- A rag and small container for parts
Diagnosing Which Handle Is Leaking
Before you tear into both handles, take a minute to pin down the culprit, because you may only need to fix one side. Feel the drip: if the water coming from the spout is warm, the hot side is failing; if cold, the cold side. You can also shut off just the hot supply valve under the sink and watch whether the drip stops. If it does, the hot handle’s washer or cartridge is your target; if it keeps dripping, it is the cold side. This simple test saves you from buying and swapping parts you do not actually need.
Common Mistakes That Cause Repeat Leaks
Plenty of first-time repairs fail not because the part was wrong but because of small errors during reassembly. Watch out for these:
- Overtightening the packing nut, which crushes the new washer and causes it to fail fast.
- Grabbing a mismatched washer, even a slightly wrong size or shape will leak; match the old one exactly.
- Forgetting plumber’s grease, which lets O-rings dry out and tear.
- Ignoring a pitted valve seat, so a fresh washer wears out within weeks.
- Reversing cartridge orientation, which can mix hot and cold or leak.
Take a photo before you disassemble so you can put everything back exactly as it came apart.
How Much a Two-Handle Repair Costs
Money is a big reason to try this yourself. A washer and O-ring kit runs just a few dollars, and a replacement cartridge is typically $10 to $25 depending on the brand. Compare that to a plumber’s service call, which often starts around $100 to $150 for a simple drip and climbs from there. Even if you buy a full repair kit and a new set of cartridges for both handles, you are usually out under $30, making this one of the highest-value DIY plumbing jobs a homeowner can tackle.
When to Call a Plumber
Most two-handle drips are a 30-minute DIY job. But if the shutoff valves are seized, the faucet body is corroded, or the leak continues after you have replaced every internal part, it may be time for a new faucet or a professional. Persistent leaks inside a wall or under the sink cabinet, rather than at the spout, also warrant a call. For a simple drip, though, knowing how to fix a leaky bathroom faucet with two handles will save you a service fee and stop that maddening sound tonight.
