Jessy Cardey and Cortney Collyer scored two goals each for the Anteaters (19-8, 5-0 in conference).
Lauren Davis made five saves for UCI.
Long Beach State is 12-16, 1-4.
The Anteaters are the No. 1 seed in the Big West Championships. Their first match will be April 30 at 4 p.m. against the winner of the Pacific-UC Davis matchup.