How to Fix a Leaky Faucet in 10 Steps: DIY Plumbing Repair Guide

Why Fixing a Leaky Faucet Yourself Saves Money and Water

A dripping faucet isn't just annoying—it wastes up to 3,000 gallons of water per year, costing you money and damaging the environment. Fortunately, most faucet leaks are easy to fix with basic tools and a little know-how. In this guide, we'll walk you through diagnosing and repairing a standard compression or cartridge faucet. You'll learn step-by-step how to replace worn washers, O-rings, and cartridges, and we'll recommend essential products like the faucet repair kit to make the job easier.

Tools and Materials You'll Need

Essential Tools

• Adjustable wrench or pliers
• Phillips and flathead screwdriver (try a magnetic screwdriver set for convenience)
• Rags and a bucket to catch water
• Penetrating oil (for stubborn parts)

Replacement Parts

• Faucet repair kit (includes washers, O-rings, and cartridges)
• Plumber's tape (Teflon tape)
• Silicone grease (for lubricating O-rings)

Optional but Helpful

• Flashlight
• Magnet tray to hold small screws

Step 1: Turn Off the Water Supply

Locate the shutoff valves under the sink—usually two small knobs (one for hot, one for cold). Turn them clockwise to close. If there are no shutoff valves, turn off the main water supply to your home. Open the faucet to release any remaining water pressure and ensure the water is completely off.

Step 2: Plug the Drain

To prevent losing small screws or e-clips down the drain, use a drain plug or stuff a rag into the sink opening. This simple step saves time and frustration later.

Step 3: Identify Your Faucet Type

Faucets come in four main types: compression (two handles, uses washers), cartridge (single or double handle, uses a cartridge), ball (single handle, rotating ball), and ceramic disc (single handle, durable). Leaking from the handle usually means a worn O-ring or cartridge; leaking from the spout often means a bad washer or cartridge seal. For this guide, we focus on compression and cartridge faucets—the most common DIY repairs.

Step 4: Remove the Handle

Look for a small set screw under the handle cap (often marked with a logo like H or C). Unscrew the cap with a flathead screwdriver, then remove the screw. Pull the handle straight up and off the stem. If it's stuck, apply penetrating oil and wait a few minutes before wiggling gently.

Step 5: Remove the Valve Stem or Cartridge

You will see a brass stem (compression) or a plastic cartridge (cartridge type). Use an adjustable wrench to unscrew the hex nut holding the stem in place. For cartridges, you may need to pull them straight out using pliers (grip the cartridge body, not the plastic stem, to avoid damage). Take note of how the parts are arranged—photographing with your phone is helpful.

Step 6: Inspect and Replace Washers/O-Rings

At the bottom of the brass stem in compression faucets, you'll find a rubber washer held by a small brass screw. Remove the screw and replace the washer with one from your faucet repair kit. Also check the O-ring around the stem—replace it if cracked or flattened. Apply plumber's tape to the stem threads and lightly grease O-rings with silicone grease.

Step 7: Replace the Cartridge (If Applicable)

For cartridge faucets, buy a matching replacement cartridge from a hardware store (or use the kit's universal cartridge if compatible). Install the new cartridge exactly like the old one, ensuring proper orientation and fully seated into the faucet body. Use plumber's tape on any threaded connections.

Step 8: Reassemble the Faucet

Reattach the valve stem or cartridge, tighten the hex nut snugly with your wrench (not too tight—risk of cracking the brass). Place the handle back on, align the set screw, and tighten. Reinstall the handle cap.

Step 9: Turn On the Water and Test

Open the shutoff valves slowly, then turn on the faucet and check both hot and cold water. Let it run for a minute to ensure no leaks at the handle or spout. If you see drips, tighten the hex nut slightly or check the O-ring.

Step 10: Clean Up and Final Check

Wipe down the area with a rag, remove the drain plug, and run the faucet for a few more minutes. Listen for any hissing or drips. If everything is dry, you've successfully fixed the leak!

Common Mistakes to Avoid

• Forgetting to turn off the water supply—this can lead to a flood.
• Overtightening parts—can crack the faucet body or strip threads.
• Using the wrong size washer or cartridge—always match exactly or use a universal kit.
• Skipping the O-ring replacement—a small O-ring can cause dripping even after a washer change.

Conclusion: Save Money and Prevent Water Waste

Fixing a leaky faucet is one of the most rewarding DIY plumbing projects. It typically takes less than an hour and costs under $10 for parts (compared to a $150 plumber call). By following these 10 steps and using the right tools like a magnetic screwdriver set and a reliable faucet repair kit, you can stop that drip for good. Remember: regular maintenance of your faucets prolongs their life and saves water. Happy repairing!