The most common cause of a leaky faucet that drips from the handle is a worn-out O-ring, damaged stem packing, or a failing internal cartridge. As the handle moves back and forth daily, friction and hard water mineral deposits degrade these delicate seals, allowing water to escape upward along the stem shaft whenever the faucet is turned on. Callout type="warning" title="Hygiene Warning": Shut off the water supply valves under the sink before beginning repairs. Verification: Operate the handle after replacing internal seals to confirm zero water escapes around the stem.
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