A bathroom faucet leaking continuously even when the handles are turned completely off is caused by a worn-out ceramic cartridge, degraded rubber O-rings, or trapped mineral sediment inside the valve body. As seals age, they lose their ability to maintain a tight compression barrier against water pressure, allowing a continuous stream of water to bypass the closed valve and escape through the spout. Callout type="warning" title="Hygiene Warning": Shut off the hot and cold water supply valves under the sink before disassembling the faucet. Verification: Turn the water supply back on after replacing the cartridge and check that zero water drips when closed.
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