Section 238.227 - Pooling of employers for purpose of computing employer contributions(1) For the purpose of computing the employer contributions required under ORS 238.225 for benefits to be provided under this chapter: (a) The Public Employees Retirement Board shall group together the school districts of the state and treat the school districts of the state as a single employer for actuarial purposes; and(b) The board shall group together all community college districts and the state and treat the community college districts and the state as a single employer for actuarial purposes.(2) For the purpose of computing the employer contributions required under ORS 238.225 for benefits to be provided under this chapter, any participating public employer other than school districts may elect to be grouped with the state and all community college districts and treated as a single employer for actuarial purposes. An election under this subsection is irrevocable.(3) The computation of the contributions of a participating public employer that makes an election under subsection (2) of this section shall be based only on the liabilities of the employer under this chapter that are incurred after the effective date of the employer's election. The board shall separately compute the contribution of the employer for the liabilities incurred by the employer under this chapter before the effective date of the employer's election.(4) A participating public employer may make an election under subsection (2) of this section only by the adoption of a resolution or ordinance by the governing body of the public employer.(5) Except as provided in this section, the board may not require that any participating public employer be grouped with any other participating public employer for the purpose of computing the employer contributions required under ORS 238.225 for benefits to be provided under this chapter. If two participating public employers merge or otherwise consolidate, and one of the public employers has made an election under subsection (2) of this section: (a) The board may not require that the public employer that is the product of the consolidation be grouped with the state and all community college districts unless the public employer makes an election under subsection (2) of this section; and(b) The board may require that the participating public employer that is the product of the consolidation make contributions based on the group rate only for those members for whom contributions based on the group rate were made before the consolidation.