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A properly functioning sump pump is characterized by its ability to activate and remove water from the sump pit when the water levels rise. This is its primary purpose: to prevent flooding by discharging excess water from the area it serves. When the water rises to a certain level, a float switch triggers the pump, which then begins to operate and expel the water, helping to maintain a safe and dry environment.

The other indicators mentioned do not necessarily signify that a sump pump is functioning correctly. For instance, while continuous operation may occur during heavy rain or flooding, it is not a sign of proper function if this happens consistently without fluctuation; this could suggest a malfunction. Noise during operation can be typical, as many pumps produce sound while running, so silence isn't an indicator of proper function nor a requirement for efficiency. Professional installation is also important for effective operation but doesn't directly reflect the functioning status of the pump itself. Hence, the best indicator of functionality is the pump's responsiveness to rising water levels.