How to Fix a Leaky Faucet (2026 Step-by-Step Guide): Easy DIY Repairs + When to Call a Plumber
A leaky faucet might seem like a small problem, but it can waste a surprising amount of water, increase your water bill, and cause long-term damage around sinks and cabinets. The good news? Most faucet leaks are caused by worn-out washers, O-rings, or cartridges—and many can be fixed with basic tools.
In this step-by-step guide, you’ll learn how to diagnose a faucet leak, fix it safely, and know when it’s time to call a plumber.
Most leaky faucets are fixed by replacing a small worn part—often for under $20.
Quick Answer: Why Is My Faucet Leaking?
Most faucet leaks happen because a small internal seal has worn out. Common causes include:
- Worn washer or rubber seal
- Damaged O-ring
- Old or broken cartridge
- Loose parts or worn valve seat
- Hard water buildup (mineral deposits)
The fix depends on where the faucet leaks: from the spout, the handle, or under the sink.
Tools You’ll Need
- Adjustable wrench
- Screwdriver (Phillips or flathead)
- Allen key (for some faucet handles)
- Plumber’s grease
- Replacement washer/O-ring/cartridge (depending on faucet type)
- Towel or rag
Step-by-Step: How to Fix a Leaky Faucet
Step 1: Turn Off the Water Supply
Look under the sink for the hot and cold shutoff valves and turn them clockwise until they stop.
Then turn on the faucet to release pressure and drain remaining water.
Step 2: Plug the Drain and Protect the Sink
Use a drain plug or a rag to prevent small screws from falling into the drain. Place a towel in the sink to protect the surface.
Step 3: Identify Your Faucet Type
Faucet repair depends on the type you have:
- Compression faucet: two handles, often older models
- Cartridge faucet: can be single or double handle
- Ball faucet: single handle with rotating ball mechanism
- Ceramic disc faucet: modern, smooth handle movement
Knowing your faucet type helps you buy the correct replacement parts.
Step 4: Remove the Handle
Most handles are held by a visible screw or a hidden screw under a decorative cap. Remove the screw and gently pull off the handle.
Step 5: Replace the Problem Part
Here are the most common fixes depending on leak location:
✅ If the Faucet Leaks From the Spout (Dripping)
- Compression faucet: replace the rubber washer and inspect the valve seat
- Cartridge faucet: replace the cartridge
- Ceramic disc faucet: clean discs or replace cartridge assembly
✅ If the Faucet Leaks From the Handle
- Replace the O-ring or packing nut seal
- Tighten the packing nut slightly (do not over-tighten)
✅ If the Faucet Leaks Under the Sink
- Check supply line connections and tighten gently
- Replace old or cracked supply lines
- Check the shutoff valve for leaks
Tip: Take the old part to the hardware store to match it correctly.
Step 6: Reassemble and Test
Put everything back together in the reverse order. Turn water back on slowly and test:
- Check for dripping from the spout
- Check handle area for leaks
- Check under the sink for leaks
If the faucet still leaks, the cartridge may not be seated correctly—or you may need a different part size.
How Much Does It Cost to Fix a Leaky Faucet?
DIY repairs are often very affordable:
- Washer/O-ring kit: $2 – $15
- Cartridge replacement: $15 – $80+
- New supply lines: $10 – $30
Professional plumbing repair typically costs $100 to $250+ depending on location and faucet type.
When to Call a Plumber
A plumber can quickly diagnose stubborn leaks and prevent water damage under cabinets.
Call a plumber if:
- You can’t shut off the water (shutoff valve is stuck or leaking)
- The leak is coming from inside the wall
- The faucet is corroded and parts won’t come off
- You replaced parts but it still leaks
- There is water damage under the sink or mold smell
FAQ
1) Why does my faucet still drip after replacing the washer?
The valve seat may be worn, or the wrong washer size was installed. Cartridge faucets may require a cartridge replacement instead.
2) Can a leaky faucet cause damage?
Yes. Over time, it can rot cabinets, stain countertops, and cause mold growth under the sink.
3) How long does it take to fix a leaky faucet?
Many DIY repairs take 20–60 minutes, depending on faucet type and part availability.
Conclusion
Fixing a leaky faucet is usually a simple DIY project involving a washer, O-ring, or cartridge replacement. Start by turning off the water, identifying your faucet type, and replacing the worn part. If the faucet is corroded, leaking inside the wall, or continues to drip after repairs, calling a plumber is the safest option.
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