The Mater Dei Monarchs compete in the Trinity League and are governed by the
CIF Southern Section.
The league is made up of the following teams.
JSerra Catholic High School 26351 Junipero Serra Road, San Juan Capistrano, CA 92675
Lutheran High School of Orange 2222 North Santiago Blvd., Orange, CA 92867
Rosary Academy 1340 N. Acacia Ave., Fullerton, CA 92831
Santa Margarita Catholic High School 22062 Antonio Parkway, Rancho Santa Margarita, CA 92688
Servite High School 1952 La Palma Ave., Anaheim, CA 92801
St. John Bosco High School 13640 Bellflower Blvd., Bellflower, CA 90706