An officer patrolling on the 800 block of South Pine Street was flagged down by a citizen at about 10:15 p.m., Sgt. Mark Streker told Noozhawk.
The victim, a male juvenile, was struck by gunfire and was taken to a local hospital, Streker said.
The suspect or suspects were not at the scene, and roads were closed in the vicinity while officers investigated the shooting.
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The victim was reported to be in serious condition, according to police.
This marked the fifth shooting incident in the city during September. However, one of those incidents involved a man who shot himself, police said.
Anyone who may have information related to the shooting is asked to contact the Santa Maria Police Department at 805-928-3781.