The men, ages 33 and 34 and both from Oakley, were taken into custody after witnesses reported a Malibu ski boat chasing a personal watercraft through the marina at high speeds, the sheriff's office said Friday.
One suspect was detained Thursday during a traffic stop in Oakley. The other was arrested after deputies served a search warrant on his home.
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Each was accused of assault with a deadly weapon (not a firearm), criminal threats and vandalism, the sheriff's office said. Bail was set at $95,000.
Anyone with additional information or video footage is asked to contact the Contra Costa County Sheriff's Office Marine Services Unit at (925) 383-4906.