(a) If you are licensed to serve 13 or more children ages five years old and older, unless otherwise specified in this division, you must have one sink for every 20 children.(b) If you are licensed to serve 13 or more children, and have children younger than five years of age in care, unless otherwise specified in this division, you must have one sink for every 17 children.(c) If you are licensed to serve 12 or fewer children, unless otherwise specified in this division, you must have at least one sink available for the children's use.(d) If you were licensed as a kindergarten and nursery school, or school: grades kindergarten and above, before September 1, 2003, you must have one sink for every 20 children.(e) If you were licensed as a drop-in center before September 1, 2003, you must have at least one sink for every 25 children.(f) A kindergarten and nursery school, school: grades kindergarten and above, and drop-in center must comply with the requirements specified in subsection (a) or (b) of this section if the permit issued prior to September 1, 2003, is no longer valid.