A faucet leaking at the base where it meets the countertop or sink is typically caused by worn-out or cracked internal rubber O-rings, a loose mounting nut underneath the sink, or a damaged spout seal. As you swivel the faucet spout back and forth daily, friction wears down the rubber O-rings, allowing water from the stream to bypass the seal and seep down onto the countertop. Callout type="warning" title="Hygiene Warning": Shut off the water supply valves under the sink before performing repairs. Verification: Turn on the water and swivel the spout to confirm zero water seepage around the base.
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