POL Government Elected Officials Auditor Mary Hull Caballero Charter, Code and Policies City Code & Charter Online Code & Charter Title 25 Plumbing Regulat Chapter 25.04 Admistrative Regulatory Provisions
25.04.090 Mechanical Devices.

It is unlawful for any person, firm, or corporation to use, employ, or permit the insertion of any mechanical device in any sewer, branch sewer, soil drain, or waste line, for the purpose of cleaning or clearing out the same, unless the person, firm, or corporation is listed with the City of Portland to perform this work.  Exception ‑ a homeowner or qualified maintenance man may clean drains or sewers.