How to Repair a Leaking Bathroom Sink Faucet

Faucets are workhorses that eventually succumb to simple mechanical wear. That rhythmic drip isn't just an annoyance; it is a signal that internal seals have hardened or mineral deposits have compromised the water-tight fit of your valves. Repairing a faucet is far more economical and environmentally friendly than replacing the entire fixture. Done well, a faucet repair restores smooth operation and eliminates waste with nothing more than a few basic hand tools. You do not need to be a professional plumber to solve this; you simply need a methodical approach to disassembly and a keen eye for identifying the correct replacement parts before you start turning wrenches.

1. Cut the Water Off First. Locate the shut-off valves under the sink and turn them clockwise until they stop. Open the faucet handles to bleed out any remaining pressure and ensure the water flow has completely ceased.
2. Expose the Hidden Fastener. Pry off the decorative cap on the top or side of the handle to reveal the screw. Use the appropriate screwdriver or hex key to remove the screw, then lift the handle away from the base.
3. Document Before You Disassemble. Use an adjustable wrench to loosen the packing nut or retaining clip holding the stem in place. Once loose, pull the cartridge or stem assembly straight up and out of the faucet body.
4. Replace Worn Seals. Check the rubber O-rings or seats for cracks, flattening, or mineral buildup. Swap out any worn components for exact matches from your repair kit.
5. Dissolve Mineral Buildup. Use a soft brush and white vinegar to clear away any white crusty mineral deposits from inside the faucet body. Rinse well to ensure a clean surface for the new seals.
6. Bring It Back to Life. Slide the cartridge back into place, tighten the retaining nut, and reattach the handle. Slowly open the shut-off valves and test the faucet for a smooth, drip-free operation.