POL Government Elected Officials Auditor Mary Hull Caballero Charter, Code & Policies City Code & Charter Online Code & Charter Title 19 Chapter 19.16  Rules And Regulations
19.16.220 Garbage Not To Be Dumped.

A.  No vessel or other watercraft shall dump garbage, dunnage, refuse, straw, or other packing material into the waters or upon the banks of any stream, tributary, or waters within or abutting the corporate limits of the City of Portland, but they shall keep them on board until after leaving the harbor or dispose of same on shore through an approved garbage disposal service.
B.  If at any time any communicable disease peculiar to animals is found to exist in any country or state from which cargo was received, no waste material in any manner whatsoever shall be discharged. 
C.  All garbage while onboard ship shall be stored in covered leak-proof containers.  Any garbage discharged while in port must be to an approved facility.