Police detectives found no signs of foul play, nor any criminal negligence, in the death of Benjamin Curry, police Lt. Doug Muse said in a statement.
The case also was extensively reviewed by the Contra Costa District Attorney's Office. The investigation included review of video footage from the pool area and interviews of Curry's family, classmates and school staff.
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As a result, no criminal charges will be filed.
The freshman was discovered at the bottom of the high school's swimming pool early in the afternoon on May 8 during fourth-period physical education class.
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School staff, police and medical personnel performed lifesaving measures before the boy was taken to Kaiser Permanente Medical Center in Walnut Creek, where he was pronounced dead.
The Contra Costa County Sheriff's Coroner Division determined Curry drowned.