Pump assembly comprising - a pump that can be driven by an electric motor, is intended for conveying a liquid and comprises a pump wheel held on a rotating shaft and a pump housing which encloses the pump wheel at least in portions and on which an inlet opening for the liquid and an outlet nozzle for the liquid are provided, - a liquid container that is designed to receive the liquid and comprises a container base, a side wall and an opening opposite the container base, a connection portion for an external supply line and a sump designed to receive the pump wheel and the pump housing being provided on the liquid container, and - a siphon-like line portion for the liquid, which portion acts as an odour stop, the siphon-like line portion, as viewed in a flow direction of the liquid, being provided upstream of the connection portion of the liquid container such that, during operation, flow passes first through the connection portion and then through the siphon-like line portion, the siphon-like line portion designed as the odour stop being provided so as to be spatially integrated in the liquid container, characterised in that a floating body is produced which is height-adjustably or pivotably arranged in the liquid container, a magnet being embedded in the floating body, which magnet interacts with an active body provided in an active-body recess, the active-body recess being produced as part of a closure cover, the position of the floating body being defined according to the fill level of the liquid container, a control signal for the pump being generated as soon as the floating body assumes a defined relative position with respect to the active body. - a pump that can be driven by an electric motor, is intended for conveying a liquid and comprises a pump wheel held on a rotating shaft and a pump housing which encloses the pump wheel at least in portions and on which an inlet opening for the liquid and an outlet nozzle for the liquid are provided, - a liquid container that is designed to receive the liquid and comprises a container base, a side wall and an opening opposite the container base, a connection portion for an external supply line and a sump designed to receive the pump wheel and the pump housing being provided on the liquid container, and - a siphon-like line portion for the liquid, which portion acts as an odour stop, the siphon-like line portion, as viewed in a flow direction of the liquid, being provided upstream of the connection portion of the liquid container such that, during operation, flow passes first through the connection portion and then through the siphon-like line portion, the siphon-like line portion designed as the odour stop being provided so as to be spatially integrated in the liquid container, characterised in that a floating body is produced which is height-adjustably or pivotably arranged in the liquid container, a magnet being embedded in the floating body, which magnet interacts with an active body provided in an active-body recess, the active-body recess being produced as part of a closure cover, the position of the floating body being defined according to the fill level of the liquid container, a control signal for the pump being generated as soon as the floating body assumes a defined relative position with respect to the active body.