Abstract: A stormwater treatment system for separating contaminants from flowing stormwater is provided. The stormwater treatment system includes a tank including an inlet for receiving stormwater runoff and an outlet for outputting stormwater subsequent to treatment. The tank includes a storage chamber for collecting pollutant. A sensor is provided within the tank and arranged and configured to generate a pollutant level indicative signal. A control system is in communication with the sensor. The control system is operable, based upon the pollutant level indicative signal, to identify when pollutant build-up within the storage chamber reaches a level requiring service and to responsively output a service notification.