A leaking bathroom faucet wastes water and increases your utility bill. To fix it, you need to identify the type of faucet and replace the worn-out washer or cartridge. This guide covers how to fix a leaking bathroom faucet step by step, helping you save money and reduce water waste. According to the EPA WaterSense program, a faucet dripping at one drop per second can waste over 3,000 gallons per year—that’s enough water for 180 showers. Whether you’re a seasoned DIYer or a first-timer, this guide will walk you through the entire repair process.
Tools and Materials You’ll Need
Before starting, gather the following items. Most are available at any hardware store or online.
- Adjustable wrench or basin wrench
- Screwdrivers (Phillips and flathead)
- Allen wrench set (hex keys)
- Replacement parts (washer, O‑ring, cartridge, or valve seat) – match your faucet model
- Plumber’s grease (silicone-based)
- Penetrating oil (e.g., WD‑40) for stubborn parts
- Bucket or towel to catch drips
- Flashlight
- Safety glasses
Identify Your Faucet Type
Bathroom faucets come in four common designs. The repair method differs for each. Check your faucet’s handle configuration to determine the type.
| Faucet Type | Handle Configuration | Common Leak Cause | Repair Part Needed |
|---|---|---|---|
| Compression | Two separate handles (hot & cold) | Worn rubber washer | Washer or O‑ring |
| Ball | Single handle that moves in a dome | Worn ball or seals | Ball assembly kit |
| Cartridge | Single handle that moves up/down and side‑to‑side | Failed cartridge | Replacement cartridge |
| Ceramic Disc | Single handle with smooth, precise motion | Damaged ceramic disc or inlet seal | Disc cartridge assembly |
Compression Faucets
These traditional faucets have two handles. Leaks usually come from a deteriorated rubber washer at the stem. Turn off the water supply under the sink, remove the handle, unscrew the stem, and replace the washer. Apply plumber’s grease to the new washer before reassembling.
Ball Faucets
Common in kitchens but also found in some bathrooms, ball faucets have a single handle and a rotating ball inside. Leaks often require a ball assembly kit. The process involves removing the handle, cap, and cam, then replacing the ball and seals. The International Association of Plumbing and Mechanical Officials (IAPMO) recommends using manufacturer‑specified parts for proper fit.
Cartridge Faucets
Cartridge faucets are widely used in modern bathrooms. A leaking cartridge usually needs to be pulled and replaced. After shutting off the water, remove the handle retaining screw, lift off the handle, and pull the cartridge straight out using pliers. Insert the new cartridge, lubricate the O‑rings, and reassemble.
Ceramic Disc Faucets
These high‑end faucets use durable ceramic discs. If the faucet leaks from the spout, the disc cartridge is likely cracked or the inlet seals are worn. Replacement involves removing the handle, unscrewing the cartridge retaining nut, and swapping the cartridge. Be careful not to damage the ceramic surfaces.
Step‑by‑Step Repair Process
Follow these general steps after identifying your faucet type. Always turn off the water supply (both hot and cold shut‑off valves under the sink) and open the faucet to relieve pressure before disassembly.
1. Shut Off Water and Drain
Locate the shut‑off valves under the sink. Turn them clockwise until fully closed. Open the faucet handle to drain any remaining water. Place a bucket or towel beneath the faucet to catch drips.
2. Remove the Handle
Most handles have a set screw hidden under a decorative cap. Pry off the cap with a flathead screwdriver, then use an Allen wrench or screwdriver to remove the screw. Gently pull the handle off. If stuck, apply penetrating oil and wait a few minutes.
3. Remove the Escutcheon (Trim Ring)
If present, unscrew or pry off the decorative ring that sits against the sink deck. This exposes the faucet body.
4. Extract the Internal Mechanism
For compression faucets, use a wrench to unscrew the stem. For cartridge or disc faucets, pull the cartridge straight out. For ball faucets, remove the cap, cam, and ball. Take note of the order and orientation of parts.
5. Replace Worn Parts
Inspect the removed parts for cracks, flat spots, or mineral buildup. Replace the washer, O‑ring, cartridge, or ball assembly with an exact match. Apply a thin layer of plumber’s grease to new rubber parts to prevent future sticking.
6. Reassemble and Test
Reinstall the parts in reverse order. Tighten connections firmly but avoid overtightening. Turn the water supply back on slowly, check for leaks, and test the handle operation. If the leak persists, double‑check that the replacement part is correct and properly seated.
When to Call a Professional
Some situations require a licensed plumber. If you encounter stripped threads, a cracked faucet body, or a leak that continues after replacing all internal parts, it’s time to call an expert. Additionally, if the shut‑off valves are stuck or leaking, a plumber can replace them safely. For other plumbing issues, check out our leak detection and pipe repair services. If you’re dealing with a running toilet, our toilet repair guide can help.
Preventing Future Leaks
Regular maintenance extends your faucet’s life. Clean aerators every few months to remove sediment. Avoid using excessive force when turning handles. Install a water softener if you have hard water – mineral buildup accelerates wear. The EPA’s WaterSense program also recommends checking for leaks annually and replacing old fixtures with WaterSense‑labeled models that use at least 20% less water.
Frequently Asked Questions
- Why is my bathroom faucet dripping even after I replaced the washer?
The valve seat may be worn or corroded. Use a seat wrench to remove and replace the seat, or install a seat‑dressing tool to smooth it. - Can I fix a leaking faucet myself without any experience?
Yes, if you follow a detailed guide and have the right tools. Start with a compression faucet (simplest). For complex cartridge or disc faucets, consider watching a tutorial or calling a pro. - How much does it cost to hire a plumber for a faucet leak?
Typical US costs range from $150 to $350 for labor and parts, but prices vary by region and complexity. DIY repair costs usually under $30 for parts. - What tools do I absolutely need?
An adjustable wrench, screwdrivers, and the correct replacement part. A basin wrench helps if the faucet is hard to reach. - How can I tell if my faucet is a cartridge or ceramic disc type?
Ceramic disc faucets have a single handle that moves very smoothly with little effort. Cartridge faucets often have a distinct “click” when the handle is raised. Check the manufacturer’s label under the handle. - Is it worth repairing an old faucet or should I replace it?
If the faucet is more than 10–15 years old or the body is cracked, replacement is often more cost‑effective. New WaterSense‑labeled faucets pay for themselves in water savings.
Ready to stop that drip for good? If you’d rather leave it to the pros, contact MyTownPlumber today for a free estimate. Our licensed technicians handle everything from minor faucet repairs to whole‑home plumbing upgrades. – MyTownPlumber Editorial Team