St. Agnes School is accreditated through WRISA, the Wisconsin Religious and Independent Schools Accreditation. This accreditation is reviewed every seven years.  Annually St. Agnes School goes through an accreditation process directed by the Archdiocese of Milwaukee. The accreditation program provides a system by which all schools in the Archdiocese can earn and maintain accreditation status. As a part of that process all teachers and the administrator of St. Agnes School are state certified.