(a) As used in this section:

(1) “Dwelling unit” means a structure or part of a structure that is used as a home, residence or sleeping place by one person who maintains a household or by two or more persons who maintain a common household.

(2) “Water meter” means a device used for measuring and billing for water consumed.

(b) No city or public water supply system shall prohibit the installation of a separate water meter for each dwelling unit within a building containing multiple dwelling units in lieu of installation of a master meter for the entire building.