How to repair a leaky bathroom faucet is a common DIY question, and the answer is often simpler than you think. By replacing a worn-out washer or cartridge, you can stop the drip in under an hour. Leaking faucets waste thousands of gallons of water each year according to the U.S. Environmental Protection Agency, and fixing them can reduce your water bill while conserving a precious resource. This guide will walk you through the process safely and effectively, whether you have a compression, cartridge, ball, or ceramic-disk faucet.
Why Fix a Leaky Faucet Now?
A slow drip of one drop per second wastes more than 3,000 gallons annually, as noted by the EPA WaterSense program. Beyond the environmental impact, the constant noise and potential for water damage to your countertop or cabinet make prompt repair worthwhile. Typical repair costs range from $5 to $30 for parts if you do it yourself, or $150–$350 for a professional plumber in most U.S. regions. Repairing now can also prevent more expensive issues like valve seat corrosion.
Tools and Materials You’ll Need
- Adjustable wrench or basin wrench
- Screwdrivers (flathead and Phillips)
- Allen wrench set (hex keys) for some handle screws
- Replacement parts: washers, O-rings, cartridge, or ceramic disk (depending on faucet type)
- Plumber’s grease (silicone-based)
- Penetrating oil (e.g., WD-40) for stuck parts
- Bucket and towels for water cleanup
Identifying Your Faucet Type
Before pulling out tools, identify your faucet mechanism. Most bathroom faucets fall into four categories. The table below shows features and common repair steps.
| Type | Common Symptom | Repair Method |
|---|---|---|
| Compression (two handles) | Drip from spout when turned off | Replace rubber washers under handle |
| Cartridge (single or two handles) | Drip from spout or handle leaks | Remove and replace cartridge |
| Ball (single-handle, often kitchen) | Drip from spout or loose handle | Replace ball assembly and springs |
| Ceramic disk (single or two handles) | Drip from spout or mineral buildup | Clean or replace ceramic disk |
Step-by-Step Repair Guide
Step 1: Shut Off the Water Supply
Locate the shut-off valves under the sink (usually two separate valves for hot and cold). Turn them clockwise until they stop. Open the faucet handle to relieve pressure and drain remaining water.
Step 2: Remove the Handle
Pry off the decorative cap (often marked Hot/Cold) using a flathead screwdriver. Unscrew the handle screw (use a Phillips or Allen key) and lift the handle off. If stuck, apply penetrating oil and wait a few minutes.
Step 3: Access the Internal Mechanism
- Compression faucet: Unscrew the packing nut, then the valve stem. Replace the washer at the base of the stem.
- Cartridge faucet: Remove the retaining clip or nut, then pull out the cartridge with pliers. Take it to a hardware store for exact match.
- Ceramic disk: Lift out the cylinder and clean the ceramic plates gently with vinegar if mineral scale is present. Replace if cracked.
Step 4: Inspect and Replace Seals
Check O-rings and rubber seals for cracks or flattening. Apply a thin layer of plumber’s grease to new O-rings before reassembling to ensure smooth operation and longer life.
Step 5: Reassemble and Test
Reverse disassembly steps. Turn on water supply slowly, open the faucet, and check for leaks. If the drip persists, you may need to replace the valve seat, which can develop pitting over time. See our guide on pipe repair for more complex valve seat work.
When to Call a Professional
If water continues to leak after replacing all visible seals, the problem may lie deeper—such as a damaged valve seat or corroded piping behind the wall. In that case, contact a licensed plumber. For related plumbing tasks, visit our pages on drain cleaning, toilet repair, and water heater repair. Regular maintenance of your home’s plumbing system helps avoid emergencies.
Frequently Asked Questions
How do I know if my faucet is compression or cartridge?
Compression faucets have separate hot and cold handles that require multiple turns to shut off. Cartridge and ceramic-disk faucets usually require only a quarter-turn and often have a single handle.
Can I use any brand of replacement parts?
Yes, as long as the part matches the size and type of your faucet. Take the old part to a hardware store for a direct comparison. Many brands follow standard dimensions.
Why is my faucet still leaking after I replaced the cartridge?
Possible causes include an incorrect cartridge, a damaged valve seat, or debris trapped in the seal. Inspect the valve seat using a flashlight; if pitted, use a seat reamer or call a professional for sewer line repair (though that’s for drains, not faucets—the principle of checking deeper issues applies).
Is it worth repairing an old faucet?
If the faucet body is in good condition and replacement parts are available, repair is usually cheaper than replacing the entire unit. However, if the faucet is more than 15 years old or mineral damage is severe, replacement may be more cost-effective in the long run.
How often should I replace O-rings or washers?
There is no set schedule, but inspect them whenever you service the faucet. Many plumbers recommend doing so every 3–5 years as part of routine maintenance.
Can a leaky faucet cause mold?
Yes, persistent moisture under the sink or on countertops can promote mold growth. The CDC advises fixing leaks promptly to reduce indoor humidity and mold risks.
Ready to stop that drip for good? If you prefer professional repair, MyTownPlumber offers expert same-day service. Check out our current plumbing offer and schedule an appointment today.
— MyTownPlumber Editorial Team