Peralta, who was consecrated a bishop in 2006, replaces now retired Archbishop Ernesto Salgado who just turned 77 years old last month.
Salgado had served the archdiocese with a population of 718,000, around 85 percent of which are Catholics, for eight years.
Peralta is 63 years old, born on July 13, 1950 in San Carlos, Pangasinan. He was ordained a priest at the age of 25 in 1975.
Pope Emeritus Benedict XVI appointed him Coadjutor bishop of Alaminos on Jan. 14, 2006. He became bishop of Alaminos by succession on July 1, 2007.
No date has been set for the installation of the new archbishop. (CBCPNews)