1. Premises having an auxiliary water supply;

2. Premises on which any substance is handled under pressure in such a fashion as to permit possible entry into the city’s distribution system, including water originated from the city’s system which is boosted in pressure;

3. Premises on which the customer’s system has more than one service connection;

4. Premises which, in the opinion of the director of public works and utilities and chief operator, contain cross-connections, or the potential for cross-connections, which could result in the pollution or contamination of the city water system in the event of backflow or back-siphonage.

1. The AWWA standards and FCCC and HR specifications have been adopted by the director of public works and utilities and chief operator. Final approval of any device or system proposed for installation under the terms of this chapter shall be evidenced by a "certificate of approval" issued by an approved testing laboratory, certifying full compliance with said AWWA standards and FCCC and HR specifications.

2. The following testing laboratory has been qualified by the director of public works and utilities and chief operator to test and certify backflow preventers:

Foundation for Cross-Connection

Control & Hydraulic Research,

University of Southern California, University Park

3. Testing laboratories other than the laboratory listed above will be accepted as they are qualified by the director of public works and utilities and chief operator.