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21.12.320 Contamination of the City Water Supply and Requirements for Backflow Protection.

(Amended by Ordinance Nos. 180120 and 182053, effective August 15, 2008.)

A.   Contamination of the City Water Supply. Except as required for operation of the water system, it is unlawful for any person to introduce or permit the introduction of any substance or pollution or contamination of any kind into the City water supply system. As to the reservoir portion of the City water supply system, also see PCC 14A.30.150 Misuse of Reservoirs.

B.   Backflow Protection. Property owners or users of City water may be required to install backflow protection in order to protect the water supply system.

1.   Authority to Require Backflow Protection. Oregon State Administrative Rules Chapter 333 (OAR 333) require water suppliers to "undertake programs for controlling, and eliminating cross-connections." These programs are for the purpose of preventing pollution and contamination resulting from inadequate backflow protection. These State regulations apply to "Community Water Systems" which include the City of Portland's water system. Through this section the Bureau adopts by reference OAR 333. The Bureau's detailed requirements are found in the document entitled "Backflow Assembly Installation Requirements" and is available from the Bureau. Backflow prevention assemblies are approved for use in Oregon by the State of Oregon (see "Approved Backflow Prevention Assembly List" available from the Bureau and the State of Oregon). As required by OAR 333, the Bureau shall require an approved backflow prevention assembly when the Bureau determines that: a complete physical separation from the City water system is not practicable or necessary; adequate inspection for cross-connection cannot be readily made; or there exists a possibility of backflow contamination resulting from special conditions, use, or equipment. The Bureau may require an approved backflow prevention assembly to be installed for new construction, where buildings or structures are remodeled, or where tenant improvements are made.

2.   Requirements for Testing Assemblies and Maintaining Backflow Protection. All assemblies must be tested immediately after installation or if the assembly is moved or repaired. Assemblies must also be tested at least once a year, on a schedule to be determined by the Bureau, or more frequently as determined necessary by the Bureau to provide adequate backflow protection. Tests shall be performed by a tester who is certified by the State of Oregon. Copies of the test results shall be provided to the water user or the owner of the premises and to the Bureau. Backflow prevention assemblies which are not functioning properly shall be repaired promptly and retested or replaced. The water user or owner of the assembly will be responsible for all associated costs of repair, testing and replacement.

3.   Authority to Deny or Discontinue Service When Backflow Protection is Inadequate. As required by OAR 333, where the Bureau has reasonable cause to believe that an existing or potential cross connection is located on a user's premises, the Bureau shall deny or discontinue service. The Bureau may also deny or discontinue service to a premise whenever an assembly is found to be malfunctioning or is not being properly maintained, tested, or repaired. Service shall not be provided or reestablished until adequate and approved backflow protection is installed and/or tested, or the cause of the hazard is otherwise eliminated.