Key Takeaways
What the Drip Is Actually Telling You
A leaky faucet is the plumbing equivalent of a warning light — and like a warning light, it usually points to something specific rather than signaling a vague catastrophe. According to the U.S. Environmental Protection Agency, a faucet dripping once per second can waste more than 3,000 gallons of water per year, so the incentive to fix it promptly is real.
The good news: most residential faucet leaks trace back to one of four common culprits — a worn rubber washer, a degraded O-ring, a faulty cartridge, or a cracked ceramic disc. All four are inexpensive components that most homeowners can swap in under an hour with basic tools. The location of the drip is your first diagnostic clue:
- Dripping from the spout when the handle is off — internal valve seat, washer, or cartridge has lost its seal.
- Water pooling at the base — the O-ring around the faucet body has failed.
- Seeping near the handle — packing material or a stem seal is worn.
Understanding this before you pick up a wrench means you can buy exactly the right part on the first trip. For a broader look at which plumbing beliefs may be steering you wrong, see our article on plumbing maintenance myths that could cost you a repair call.
Photograph Before You Disassemble
Use your phone to take a quick photo of each layer of the faucet as you take it apart. This gives you a reference when it's time to reassemble, and it helps the hardware store associate match the correct replacement parts if you bring the photos along.
What You'll Need Before You Start
Gathering the right materials in advance is what separates a smooth 20-minute repair from a frustrated afternoon. Because replacement parts must match your specific faucet model, identification comes first — look for the model number stamped on the faucet body or on a label inside the cabinet door.
What you will need
Adjustable wrench
Loosens packing nuts and supply line fittings.
Phillips and flathead screwdrivers
Removes handle screws and pries off decorative caps.
Needle-nose pliers
Grips and removes small retaining clips or O-rings.
Replacement washers, O-rings, or cartridge
The actual parts that stop the leak — match exactly to your faucet model.
Plumber's grease
Lubricates O-rings and moving parts to extend their service life.
Bucket or towels
Catches residual water in the supply lines after shutoff.
Cartridge puller
Extracts stubborn cartridges without damaging the faucet body.
If you're unsure whether this repair is within your comfort zone, our guide on DIY maintenance vs. hiring a pro offers a practical framework for making that call.
Step-by-Step Repair Instructions
Always Shut Off the Water First
Before you loosen a single screw, locate the shutoff valves under the sink and turn them clockwise until fully closed. If your faucet has no individual shutoffs, you'll need to shut off the main water supply to your home. Skipping this step can result in significant water damage within seconds of disassembly.
Identify the leak location and faucet type
Observe exactly where the water is escaping. A drip from the spout usually means a worn internal valve seat, washer, or cartridge. Leaking around the base of the faucet points to a failed O-ring on the body. Water seeping near the handle suggests a packing nut or stem seal issue.
Next, determine your faucet type. Older two-handle faucets are typically compression style. Single-handle faucets are usually ball or cartridge style. High-end faucets often use ceramic disc cartridges. Knowing the type tells you exactly which part to buy.
Shut off the water supply and clear the area
Turn both shutoff valves under the sink clockwise until they stop. Open the faucet handle to release any remaining pressure and drain water from the lines. Place a bucket or old towels under the work area to catch residual drips.
Disassemble the handle and access the valve
Pry off the decorative cap on the handle using a flathead screwdriver — the screw beneath it secures the handle. Remove the handle screw and lift the handle straight off. You'll now see the packing nut, stem, or cartridge depending on your faucet type. Use an adjustable wrench to loosen the packing nut, then pull the stem or cartridge straight out.
Inspect and replace the worn part
Examine what you removed:
- Compression faucet: Look for a rubber washer at the bottom of the stem. If it's flattened, cracked, or grooved, it's the culprit. Replace it with an exact-size match and secure with the brass screw.
- Cartridge faucet: The entire cartridge is usually swapped as one unit. Note which direction it faces before pulling it out — orientation matters.
- Ball faucet: A kit typically includes new springs, seats, O-rings, and a ball — replace the whole set rather than guessing which part failed.
- Ceramic disc: Inspect the disc for cracks. Clean mineral deposits from the disc with white vinegar before assuming replacement is needed.
Apply plumber's grease to any new O-rings or rubber parts before installation.
Reassemble the faucet and test
Reverse your disassembly steps: reinstall the stem or cartridge, tighten the packing nut snugly (do not overtighten — hand-tight plus a quarter turn is usually sufficient), reattach the handle, and replace the decorative cap.
Slowly reopen the shutoff valves to restore water pressure. Turn the faucet on and off several times and watch for any remaining drips at the spout, base, and handle connections. If a minor seep persists at a connection, try snugging that fitting a bit more.
When a Plumber Is the Right Call
This repair is genuinely DIY-friendly when the faucet type is identifiable, parts are available, and valves shut off cleanly. However, a few situations call for a licensed plumber:
- Shutoff valves that won't fully close or are corroded
- Supply line fittings that are corroded onto the faucet tailpiece
- Faucet bodies that are cracked or the threads are stripped
- Leaks that persist after correct part replacement, suggesting a deeper supply pressure issue
A running toilet is another common household water-waster that follows similar DIY logic — our guide to fixing a running toilet walks through that repair in the same step-by-step format. Tackling these smaller projects builds the diagnostic confidence that makes larger maintenance decisions easier over time.
Don't Force Stuck or Corroded Parts
If a cartridge or stem won't budge after firm hand pressure, stop. Forcing a corroded component can crack the faucet body or damage supply lines. In that case, a licensed plumber has the specialty pullers and experience to extract seized parts safely. Knowing when to stop is part of responsible DIY — see our guide on repairs homeowners commonly overestimate for more context.