Where toilets and sinks are shared by children and adults, a written policy shall be developed and implemented that requires supervision of children when using the shared toilet room. Programs shall provide changing and sanitary facilities appropriate to meet the individual needs of children who are enrolled at the facility who need assistance with toileting or who are not independent with toileting. Facilities using potty chairs in addition to the required toilets shall ensure that they are of a nonporous, synthetic product, and emptied into the toilet, cleaned and disinfected after each individual use. For programs serving children under five years of age there shall be at least one toilet and one sink with hot and cold running water for every sixteen children, or fraction thereof. For programs serving only school age children, there shall be at least one toilet and one sink with running water for every twenty-five children, or fraction thereof. Toilet facilities shall be designed in such a manner to allow individual privacy. Sinks with running water shall be readily accessible to the toilet rooms if not located within them. Toilet tissue, soap, a mechanism for individual hand drying and a waste receptacle shall be accessible to the toilets and sinks. Staff, program staff, and children shall wash their hands with soap and water after toileting. Each toilet and sink shall be located at the facility or licensed premises, as applicable, of the child care center or group child care home. Each toilet room shall be well lighted and ventilated to the outside atmosphere. In child care centers constructed or renovated after January 1, 1994, all toilet facilities shall be mechanically ventilated to the outside atmosphere.