Abstract: An anti-flooding sewage grinder pump liquid level control system in a separately mounted canister is provided for installation within and controlling operation of a sewage grinder pump installed within a sewage collection tank. Within the control canister, pneumatically operated electric control switches for controlling on/off operation of the sewage grinder pump and for redundant pump down of alarm high level flooding conditions, are provided. The control switches are mounted within one or more diving bell-type containment vessels for preventing flooding of the electric control switches in case of surge overloads of liquid sewage or failure of the primary on/off pneumatic/electrical control switch. In the event of flooding, the containment vessel will pressurize air in the top of the containment vessel and will actuate the alarm level control switch. The alarm level control switch is wired to provide redundant excitation to the sewage grinder pump motor.