Fixing a dripping single-handle faucet requires replacing the internal ceramic cartridge. Shut off the hot and cold water supply valves under the sink, loosen the handle set-screw with an Allen wrench, and remove the handle. Unscrew the retaining nut, pull out the old cartridge, and insert an exact-matching replacement cartridge. Reassemble the handle components and turn the water back on. Callout type="warning" title="Hygiene Warning": Shut off the water supply valves under the sink before starting repairs. Verification: Test the handle in both closed and open positions to confirm zero dripping from the spout.
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