A faucet dripping continuously when the handle is turned completely off is caused by a worn-out ceramic disc cartridge, degraded rubber O-rings, or mineral scale sediment trapped inside the valve body. Over time, friction and hard water wear down these internal waterproof seals, preventing the valve from closing tightly against water pressure and allowing water to bypass the closed seal. Verification: Shut off the water supply under the sink, disassemble the handle, and inspect the internal cartridge for cracks or wear.
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