To fix a leaking sink faucet, start by shutting off the hot and cold water supply valves underneath the sink. Remove the handle set-screw with an Allen wrench, lift off the handle, and unscrew the retaining nut to access the internal ceramic cartridge or rubber washers. Pull out the worn component, install an exact-matching replacement part, reassemble the handle, and turn the water back on. Callout type="warning" title="Hygiene Warning": Shut off the water supply valves under the sink before beginning repairs. Verification: Test the faucet in both closed and open positions to confirm zero dripping.
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