A waste level monitoring system for an aircraft waste tank, comprising: a point level sensor disposed on the aircraft waste tank; a load cell disposed on the aircraft waste tank; a flush counter configured to count a number of toilet flushes since a previous service to the aircraft waste tank; and a controller electronically coupled to the point level sensor, the load cell, and the flush counter, the controller configured to: receive, via the point level sensor, a first signal indicating a level of waste within the aircraft waste tank; receive, via the load cell, a second signal indicating a weight of the aircraft waste tank; receive, via the flush counter, a third signal indicating the number of toilet flushes since the previous service to the aircraft waste tank; characterized in that the controller is configured to: determine whether the point level sensor is faulted; in response to the point level sensor being faulted, determine whether: (a) the weight of the aircraft waste tank is between a minimum weight threshold and a maximum weight threshold; and (b) the number of toilet flushes is greater than a minimum flush threshold; and in response to both (a) and (b) being true, send a waste system status signal to a display device onboard an aircraft indicating that the aircraft waste tank is full. a point level sensor disposed on the aircraft waste tank; a load cell disposed on the aircraft waste tank; a flush counter configured to count a number of toilet flushes since a previous service to the aircraft waste tank; and a controller electronically coupled to the point level sensor, the load cell, and the flush counter, the controller configured to: receive, via the point level sensor, a first signal indicating a level of waste within the aircraft waste tank; receive, via the load cell, a second signal indicating a weight of the aircraft waste tank; receive, via the flush counter, a third signal indicating the number of toilet flushes since the previous service to the aircraft waste tank; characterized in that the controller is configured to: determine whether the point level sensor is faulted; in response to the point level sensor being faulted, determine whether: (a) the weight of the aircraft waste tank is between a minimum weight threshold and a maximum weight threshold; and (b) the number of toilet flushes is greater than a minimum flush threshold; and in response to both (a) and (b) being true, send a waste system status signal to a display device onboard an aircraft indicating that the aircraft waste tank is full. receive, via the point level sensor, a first signal indicating a level of waste within the aircraft waste tank; receive, via the load cell, a second signal indicating a weight of the aircraft waste tank; receive, via the flush counter, a third signal indicating the number of toilet flushes since the previous service to the aircraft waste tank; characterized in that the controller is configured to: determine whether the point level sensor is faulted; in response to the point level sensor being faulted, determine whether: (a) the weight of the aircraft waste tank is between a minimum weight threshold and a maximum weight threshold; and (b) the number of toilet flushes is greater than a minimum flush threshold; and in response to both (a) and (b) being true, send a waste system status signal to a display device onboard an aircraft indicating that the aircraft waste tank is full. determine whether the point level sensor is faulted; in response to the point level sensor being faulted, determine whether: (a) the weight of the aircraft waste tank is between a minimum weight threshold and a maximum weight threshold; and (b) the number of toilet flushes is greater than a minimum flush threshold; and (a) the weight of the aircraft waste tank is between a minimum weight threshold and a maximum weight threshold; and (b) the number of toilet flushes is greater than a minimum flush threshold; and in response to both (a) and (b) being true, send a waste system status signal to a display device onboard an aircraft indicating that the aircraft waste tank is full.