Abstract: A self-contained, indoor wastewater disposal system for collecting, grinding, and pumping wastewater is readily installed within a building such as in the basement thereof by connecting to a wastewater feed pipe, to a wastewater discharge pipe, and to an electrical power supply such as a standard 120 volt or 220 volt electrical outlet. The system generally includes a tank, a grinder pump, and an alarm unit for indicating a problem with the operation of the system. The alarm unit is desirably operable to indicate loss of electrical power to the grinder pump, indicate an overflow water level in the tank, and/or indicate adegradation of performance of the grinder pump. The tank may be configured for receiving the wastewater feed pipe from the building at either of two orientations which are disposed ninety-degrees from each other so that the system may be easily and closely positioned adjacent to a wall of the building and so that the connection of the wastewater feed pipe to the tank is obscured from view.