(A) Every building in which plumbing fixtures are installed and are for human use, occupancy or habitation, shall be provided with an ample supply of pure and wholesome water with one inch or larger service copper pipe, type K.
(B) Every building in which plumbing fixtures are installed and are for human use, occupancy or habitation shall be provided with an ample supply of potable water with the minimum size of any water service connection to be one inch. Service pipe may be either copper or plastic. Copper pipe shall be of one inch nominal pipe size. It shall have an outside diameter of not less than 1.125 inches and a wall thickness of not less than .065 inches for type K soft temper conforming to A.S.T.M. B-88 and B-251. Plastic pipe shall be of a type approved by the National Sanitation Foundation (N.S.F.) and be marked according to the foundation requirements applicable to A.S.T.M. and commercial product standards for the type of material selected and the conditions of service. Plastic piping shall be rated at 160 PSI minimum at 73.4°F.
(1980 Code, § 24.107) Penalty, see § 51.999