Oregon Revised Statutes Public Officers and Employees § 238A.070

(1) All public employers participating in the Public Employees Retirement System on August 29, 2003:

(2) Any participating public employer that provided retirement benefits under ORS chapter 238 for some but not all of the employees of the participating public employer on August 28, 2003, need not provide benefits under the Oregon Public Service Retirement Plan for any class of employees who were not members of the system on August 28, 2003.

(3) Any public employer that is not a participating public employer on August 28, 2003, may become a participating public employer under the pension program or the individual account program, or both. A public employer may become a participating public employer under this subsection only for the purposes of service performed by eligible employees of the public employer on or after the date the public employer elects to participate in the program.