A kitchen sink leaking continuously even when the faucet handles are turned completely off points to a failing internal ceramic disc cartridge, worn rubber washers, or degraded O-rings. When these internal sealing components lose their elasticity or get damaged by hard water mineral scale, they can no longer form a tight compression barrier against incoming water pressure, allowing water to bypass the closed valve. Verification: Shut off the water supply valves under the sink, disassemble the handle, and inspect the internal cartridge for cracks or wear.
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