A protective device for a wastewater sensor of a wastewater lift station is characterized by a protector that is sealed against wastewater intrusion at an upper end and open at a tapered lower end, with the protector disposed about at least a portion of a wastewater level sensor assembly. The protector is retained vertically within the lift station such that the bottom opening is proximate a bottom of the lift station. The protector may be incorporated into a wastewater level sensor assembly for a wastewater lift station utilizing, for example, a float-type water level sensor, a multiple discrete electrode-type water level sensor, or a transducer-type water level sensor.