Or. Admin. R. 459-009-0098
In determining the amounts to be paid to PERS by a public employer, if a current employer contribution rate does not exist for an employer and they employ fewer than five active members on their payroll, PERS will apply the system-wide average rate as the employer contribution rate.
ORS 238.650 & Sections 35 and 37, chapter 355, Oregon Laws 2019
ORS 238.225 & ORS 238A.220