Every community should have a way of disposing sewage so that people, animals and flies cannot touch it. This is called a sewage system. We know that poor sanitation is the basic cause of a number of diseases. To make our sanitation get better there are different types of sewage systems which can be used such as on-site systems and sewage or effluent systems. Septic tanks, composting pits, chemical toilets, etc., are examples of on-site sewage disposal systems.