How to Fix a Leaky Faucet in 10 Steps: A DIY Guide for Beginners

Why a Leaky Faucet Needs Immediate Attention

A dripping faucet isn't just annoying—it can waste hundreds of gallons of water a year and add to your utility bill. Most leaks are caused by worn-out washers, O-rings, or cartridge issues that you can fix yourself with basic tools. This guide walks you through a complete repair for a standard compression faucet (two handles), but the principles apply to cartridge and ball-type faucets as well. You'll save money and gain confidence in tackling basic plumbing. Before starting, gather a magnetic screwdriver set to prevent lost screws, and pick up a faucet repair kit with washers and O-rings for a cost-effective fix.

Tools and Materials You'll Need

Essential Tools

• Adjustable wrench or basin wrench
• Flathead and Phillips screwdrivers (magnetic preferred)
• Plumber's grease (silicone-based)
• Penetrating oil (if parts are stuck)
• Old towels or a bucket

Replacement Parts

• Faucet washers and O-rings kit (size matches your faucet)
• Replacement cartridge (if it's a cartridge faucet)
• Optional: new handle or decorative trim

Step-by-Step Faucet Repair

Step 1: Turn Off the Water Supply

Locate the shut-off valves under the sink. Turn them clockwise to close. If there are no individual valves, shut off the main water supply to your house. Open the faucet to release any remaining pressure and drain the lines.

Step 2: Protect the Sink and Remove Handles

Place a towel in the sink to catch small parts. Use a flathead screwdriver to gently pry off the decorative cap (hot/cold indicator) on each handle. Underneath, you'll find a screw. Use a magnetic screwdriver to remove it. If the screw is stripped, apply penetrating oil and wait 10 minutes.

Step 3: Remove the Handle and Bonnet

Pull the handle straight off. If it's stuck, wiggle gently or use a handle puller. Next, use an adjustable wrench to unscrew the bonnet (the round nut that holds the stem). Turn counterclockwise.

Step 4: Lift Out the Stem Assembly

Pull the stem (the long metal rod with the washer at the bottom) out of the faucet body. Inspect the washer—if it's flattened, cracked, or worn, it's the likely cause of the leak. Also check the O-ring around the stem for damage.

Step 5: Remove the Old Washer

Take the stem to your work area. Remove the brass screw holding the washer. Pop the old washer off. Note the size and shape (flat or beveled) to match with a new one from your faucet repair kit.

Step 6: Install the New Washer and O-Ring

Place the new washer onto the stem, then secure it with the brass screw—do not overtighten. Apply a thin layer of plumber's grease to the new O-ring before sliding it into the groove. Grease helps the O-ring seal and prevents future sticking.

Step 7: Reassemble the Stem Back into Faucet

Insert the stem back into the faucet body. Hand-tighten the bonnet, then use the wrench to snug it—just firm, not overly tight. Replace the handle and screw, then press the decorative cap back on.

Step 8: Turn Water Back On and Test

Slowly open the shut-off valves. Check for drips at the spout and any leaks around the handle. Turn the faucet on and off a few times to seat the washer properly. If it still drips, the seat inside the faucet may be damaged—use a seat tool to smooth it.

Step 9: Replace Cartridge for Single-Handle Faucets

If you have a single-handle cartridge faucet, the process is similar but you'll replace the entire cartridge. After removing the handle, pull out the retaining clip and old cartridge. Insert a new one from your kit, then reinstall the handle. Test for leaks.

Step 10: Clean Up and Prevent Future Leaks

Wipe down the faucet, dispose of old parts, and store your tools. To extend the life of your repair, avoid using excessive force when turning handles. Also consider installing a water pressure regulator if your home's pressure is high—this reduces wear on washers and O-rings.

Common Faucet Issues and Troubleshooting

My faucet still leaks after replacing the washer

This could mean the brass seat inside the faucet is rough or pitted. Use a seat wrench (available at hardware stores) to remove the seat and replace it or resurface it with a seat cutter. Alternatively, the stem itself may be worn—replace the entire stem assembly.

Why is the handle hard to turn?

Usually due to a corroded stem or overtightened packing nut. Remove the handle, apply penetrating oil, and grease the O-rings. If the stem is galled, replace it.

Can I use Teflon tape on faucet threads?

Only on threaded connections where the nut meets the water supply line (like the supply tube). Do not use tape on compression fittings—it can cause leaks. For stem threads, plumber's grease is better.

When to Call a Plumber

If you've replaced the washer, O-ring, and still have a persistent drip, or if you encounter a broken shut-off valve or frozen pipe, it's wise to call a professional. Also, if your faucet is a complex thermostatic or electronic model, consult the manual before attempting repair.

Preventive Maintenance Tips

• Change washer and O-rings every 2-3 years during routine home maintenance.
• Install a whole-house water filter to reduce sediment that wears down faucet parts.
• Use gentle pressure when closing handles—don't over-tighten.
• Keep a household tool kit handy for future repairs.

Conclusion

Fixing a leaky faucet is one of the most satisfying DIY plumbing projects because it's quick, inexpensive, and stops waste immediately. By following these steps and using the right parts, you can restore your faucet to like-new condition. For any stubborn leaks, double-check the seat condition or upgrade to a modern ceramic cartridge. With a little practice, you'll be able to handle most basic plumbing issues confidently.