Chapter 5.45 SUPPLEMENTAL ON-SITE SEWAGE SYSTEM INSTALLER CERTIFICATION AND INSTALLATION REQUIREMENTS This chapter is included in your selections. Sections: 5.45.010 Purpose. 5.45.020 Background. 5.45.030 Installer certification. 5.45.040 Installer company certification. 5.45.050 Health Officer approval required. 5.45.060 Procedure.