Chapter 13.20 CROSS-CONNECTIONS — BACKFLOW PREVENTION This chapter is included in your selections. Sections: 13.20.010 Purpose. 13.20.020 Definitions. 13.20.030 Where protection is required. 13.20.040 Type of protection. 13.20.050 Responsibilities. 13.20.060 Discontinuance of service. 13.20.070 Right of entry. 13.20.080 Penalty for violation.