ORS § 454.225
The governing body of the municipality may establish just and equitable rates or charges to be paid for the use of the disposal system by each person, firm or corporation whose premises are served thereby, or upon subsequent service thereto. If the service charges so established are not paid when due, the amounts thereof, together with such penalties, interests and costs as may be provided by the governing body of the municipality may be recovered in an action at law, or if the municipality does not have the ability to collect sewerage disposal charges in connection with or as part of the charge for another service or utility that can be curtailed to secure collection, the charge may be certified and presented after July 15 and on or before the following July 15 to the tax assessor of the county in which the municipality is situated and be by the assessor assessed against the premises serviced on the next assessment and tax roll prepared after July 15. Once the service charges are certified and presented to the assessor, the payment for the service charges must be made to the tax collector pursuant to ORS 311.370. Such payment shall be made by the person responsible for the delinquent service charge or by the municipality who has received payment for the delinquent service charge. These charges shall thereupon be collected and paid over in the same manner as other taxes are certified, assessed, collected and paid over.
ORS 454.225