The single most common cause of a dripping faucet is a worn-out, compressed, or damaged internal rubber O-ring, washer, or ceramic disc cartridge. As faucets are opened and closed thousands of times, friction and hard water mineral deposits degrade these internal waterproof seals, preventing the valve mechanism from seating tightly against the water inlet when the handle is turned off. Verification: Shut off the water supply under the sink, disassemble the handle, and inspect the internal washer or cartridge for cracks or flattening.
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