Abstract: A flowable material level sensor for use in a material containment structure which closes or activates a switch when the flowable material in the containment structure reaches a predetermined level. The sensor includes an elongated rod or wand which extends downwardly from a sensor housing positioned in the containment structure. The sensor includes an actuator assembly which converts angular or lateral movement of the rod into upward longitudinal movement of an actuator element therein which closes the switch when the level of material in the containment structure has reached the predetermined level. The closure of the switch is communicated to a monitoring station remote from the containment structure.