Abstract: A sewage system wherein a sewer line for delivering sewage to a discharge point and a compressed air line extend adjacent to each other. A pluraity of tanks at spaced points and serving to collect sewage from different sources are connected to the sewer line and to the air line. Each connection of a tank with the air line is controlled by a multiple stage valve means which normally vents the tank and prevents air flow to the tank. Each multiple stage valve means includes a pilot valve controlled by float means in the associated tank and a pneumatically activated valve. Check valves are interposed adjacent each tank at the sewage collection and sewage discharge points thereof.