In all tenement houses hereafter erected, whenever a connection with the city water main is in any way possible (and of this possibility the bureau of health of said cities shall be the sole judge), there shall be an independent water supply, and at least one sink for every tenement or suite of rooms; and in every now existing tenement house, or house that may be hereafter converted into a tenement house, there shall be on every floor at least one proper sink, with running water, accessible to all the tenants of that floor, without passing through any other apartment, if there be no such sink in each apartment; and the space under all sinks shall have no woodwork enclosing the same, but shall be left entirely open.
53 P.S. § 25023