Chapter 13.10 BACKFLOW PREVENTION This chapter is included in your selections. Sections: 13.10.010 Purpose. 13.10.020 City responsibility. 13.10.030 Plumbing official responsibility. 13.10.040 Certified backflow assembly technician to perform work. 13.10.050 Definitions. 13.10.060 Installation requirements. 13.10.070 Inspection and maintenance requirements.