ORS § 448.420
On and after September 27, 1987, an operator holding a current Oregon sewage treatment certification issued under a voluntary certification program shall be considered certified under the program established under ORS 448.410 at the same classification and grade. Certification of operators by any state that, as determined by the Director of the Department of Environmental Quality, accepts certifications made under ORS 448.410 to 448.430 and 448.992, shall be accorded reciprocal treatment and shall be recognized as valid and sufficient within the purview of ORS 448.410 to 448.430 and 448.992, if in the judgment of the director, the certification requirements of such state are substantially equivalent to the requirements of ORS 448.410 to 448.430 and 448.992 or any rule adopted under ORS 448.410 to 448.430 and 448.992.
ORS 448.420
See note under 448.405.