The County Public Health Officer and his or her staff will maintain regular surveillance of the public water supply and sanitation system and issue appropriate instructions or warnings to the public through the E.O.C., maintain regular surveillance of all mass feeding and canteen operations to ensure proper food handling practices and disease prevention procedures, maintain regular surveillance of the health of the population and institute all necessary preventive programs of inoculation with the assistance of the E.O.C. and voluntary agencies such as the Red Cross.