ORS 547.490

All drainage districts containing not more than 2,000 acres, organized under the provisions of the Drainage District Act, may waive payment of penalty or interest, or both, on district assessments. County tax collecting officers are authorized to collect and receipt for assessments levied by any such drainage district, waiving payment of penalty or interest, or both, when presented with a certified copy of resolution or other action of the drainage district waiving such payment.