Chapter 18.20 SEPTIC TANKS Revised This chapter is included in your selections. Sections: 18.20.000 Regulations. 18.20.010 Definitions. 18.20.020 Designer’s certificate. 18.20.040 Permits. Revised 18.20.050 Where systems required. 18.20.060 Location. 18.20.070 Standards. 18.20.080 Maintenance.