Finds that the number, location, and functionality of on-site sewage disposal systems in operation in Washington is unknown. Creating a locally designed inventory and inspection system for on-site sewage disposal systems, and encouraging expansion of sanitary sewage systems, are necessary first steps towards addressing the problems inherent with failing systems. When prioritizing inventories and inspections, areas within incorporated cities should be addressed as early as possible because of the inherent proximity of sanitary sewage systems to existing on-site sewage disposal systems in use within a city.