The Enrollment office processes enrollment applications, relinquishments, issues Certification of Indian Blood (CIB), Tribal Identification Cards, and traces family genealogy. In addition this office maintains records of Tribal members and their addresses for mailings and announcements as well as demographic information of tribal members and reservation residents for numerous uses by other departments and outside agencies.
The Enrollment office also administers several Tribal member benefits including the quarterly gaming distribution, minors gaming trust accounts, elders pension and SSI plans, and the tribe's burial assistance plan.
The Confederated Tribes of the Umatilla Indian Reservation has over 2,900 enrolled members.
To become an enrolled member of the Confederated Tribes of the Umatilla Indian Reservation, a person must meet some specific criteria and apply for membership. The criteria was adopted by the Tribe's general membership and is listed in Section B, Article IV of the CTUIR's Constitution and By-Laws. To be eligible for enrollment, the applicant must meet BOTH of the following adopted criteria:
- Have one parent or grandparent who is an enrolled member of the Confederated Tribes of the Umatilla Indian Reservation; AND
- Have at least one-fourth (1/4) degree of Indian blood from any federally recognized Indian Tribe within the United States.