If you want to know how to repair a dripping bathroom faucet, the answer depends on what is inside the handle. Most drips are caused by a worn washer, O-ring, or cartridge, and replacing that part usually stops the leak. You can do this repair yourself in about 30 to 60 minutes with basic tools, but you must turn off the water first. This guide covers the tools, steps, and safety checks for a typical bathroom faucet. According to the EPA WaterSense program, even a slow drip can waste thousands of gallons over time, so fixing it quickly matters.
Why You Should Fix a Dripping Bathroom Faucet Quickly
A dripping faucet is more than an annoyance. It can raise your water bill and, if the drip is on the hot water side, it can also increase your energy costs. The U.S. Department of Energy explains that water heating is a major part of home energy use, so a hot water leak wastes both water and energy. You can read more about water heating efficiency at Energy.gov. Repairing the faucet now also prevents small leaks from damaging the sink, cabinet, or floor. If you already see water stains or soft wood under the sink, you may need leak detection before the repair.
How a Bathroom Faucet Works
Most bathroom faucets mix hot and cold water through a control valve. When you turn the handle, the valve opens and allows water to flow. When you close it, a washer, O-ring, or cartridge seals the opening. Over time, these parts wear out, harden, or collect mineral deposits, and water seeps past the seal. That seeping water is the drip you hear.
Understanding this basic process helps you diagnose the leak. A steady drip from the spout usually means the sealing part is bad. A leak around the base of the handle often means an O-ring needs replacement. A puddle under the sink may indicate a supply line or drain problem, not the faucet itself.
Tools and Supplies You Will Need
Before you start, gather these items:
- Adjustable wrench
- Flat-head and Phillips screwdrivers
- Replacement washer, O-ring, or cartridge that matches your faucet
- Plumber's grease
- Penetrating oil for stuck screws
- Clean rag and a small bucket
- Flashlight
You can often find the replacement part at a local hardware store. If you are not sure which part to buy, remove the old part first and take it with you.
Identify Your Faucet Type
Bathroom faucets use different internal mechanisms. Knowing which type you have is important because the repair varies by design. Use the table below to find the likely cause and the part you will need.
| Faucet type | Common drip cause | Part to replace |
|---|---|---|
| Compression | Worn rubber washer or valve seat | Washer and/or seat |
| Ball-type | Worn ball assembly or springs | Ball assembly and springs |
| Cartridge | Failed cartridge | Cartridge |
| Ceramic disk | Damaged ceramic cartridge | Ceramic disk cartridge |
If you are unsure, remove the handle and look at the internal mechanism. Take a photo before disassembly so you can remember how the parts fit together.
Step-by-Step Bathroom Faucet Repair
Step 1: Turn Off the Water Supply
Look under the sink for two shutoff valves, one for hot water and one for cold water. Turn both clockwise until they are fully closed. If your bathroom does not have shutoff valves, turn off the main water supply for your home. Then open the faucet handle to release any water still in the pipes.
Step 2: Remove the Handle
Many handles have a small cap that hides a screw. Pry off the cap with a flat-head screwdriver, then remove the screw. If the handle is stuck, apply a small amount of penetrating oil and wait a few minutes. Lift the handle straight up. For single-handle faucets, you may need to unscrew a set screw from the back of the handle.
Step 3: Remove the Washer or Cartridge
Once the handle is off, you will see a retaining nut or clip. Use an adjustable wrench to remove the nut, then pull out the cartridge or washer assembly. Pay attention to the orientation of the part before you remove it. Some cartridges have a notch that must line up with a tab inside the faucet body.
Step 4: Install the Replacement Part
Compare the new part with the old one to make sure they match. Apply a thin layer of plumber's grease to the O-rings to help the part slide in and create a good seal. Push the new cartridge or washer into place, then reinstall the retaining nut or clip. Do not overtighten, because that can crack the valve body.
Step 5: Reassemble and Test
Put the handle back on and tighten the screw. Turn the shutoff valves back on slowly. Open the faucet and check for leaks from the handle, spout, and base. Run both hot and cold water for a few seconds, then turn it off and watch for drips. If the faucet still drips, you may need to replace the valve seat or the entire faucet.
Common Mistakes to Avoid
- Forgetting to turn off the water before starting.
- Using the wrong replacement part. Take the old part to the store.
- Overtightening the retaining nut. This can crack the faucet body.
- Skipping plumber's grease on O-rings, which makes installation harder.
- Reassembling in the wrong order. Use your phone to take photos.
Even a simple repair can go wrong if you rush. If you are not comfortable after a few steps, stop and call a professional.
Testing and Final Checks
After you reassemble the faucet, turn the water supply back on slowly. Check the handle, spout, and base for drips. Let the water run for 30 seconds, then turn it off and wait. Wipe the faucet dry with a paper towel and check again after 10 minutes. If the paper towel stays dry, your repair is complete.
If you see a slow leak around the handle, tighten the retaining nut slightly. If water pools under the sink, check the supply line connections. A loose supply line can look like a faucet leak but may need a separate pipe repair.
Preventing Future Drips
Most faucet drips are caused by normal wear. You can extend the life of your faucet by cleaning the aerator regularly and avoiding excessive force when turning the handle. If you have hard water, mineral buildup can damage cartridges faster. A water softener can help reduce scale throughout your plumbing. For more information, see our water softener page.
When to Call a Professional
Some repairs are more complicated than they look. If you cannot shut off the water, if the valve body is cracked, or if the faucet still drips after replacing the cartridge, call a licensed plumber. A plumber can also check for hidden problems behind the wall. If you suspect a supply line or drain issue, our pipe repair team can help. For other common bathroom problems, our toilet repair guide may also be useful.
Professional faucet repair costs vary by region and by faucet type. A typical US range is $150 to $350 for a bathroom faucet repair, but the total depends on the part and labor rate. Ask for an itemized estimate before work begins.
If you are concerned about older plumbing and lead exposure, the CDC provides guidance on drinking water safety at CDC Healthy Water.
If this repair feels too involved, or if the faucet still drips after replacing the cartridge, call MyTownPlumber. We offer professional faucet repair and can also handle hidden leaks and other plumbing issues. Check our current plumbing offer to save on your service.
By: MyTownPlumber Editorial Team