San Diego State University, San Diego, California, February 17, 1991-2005
Eta Sigma became Alpha Delta Pis 11th California chapter when it was installed in 1991. The colony was formed in the fall of 1990 according to the university's expansion plans, and the group was active in homecoming, as tutors and in fundraising for local philanthropies. When 52 charter members were initiated, Eta Sigma joined a Greek system with 12 other NPC sororities and 18 IFC fraternities. The chapter closed due to low numbers.