The man was surfing when something bit his leg, but he couldn't see what caused the injury and couldn't confirm whether it was a shark, police said.
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VIDEO: Great white shark swims dangerously close to shore in Santa Cruz County
VIDEO: Great white shark swims near Santa Cruz Co. shore
The man was able to get out of the water and call for medical assistance at about 3:45 p.m., police said.
The man was taken to a local hospital for non-life-threatening injuries.
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Anyone with relevant information regarding the incident is asked to contact the Pacifica Police Department at (650) 738-7314 or call the silent witness tip line at (650) 359-4444.