Every building, structure, or premises in or on which plumbing fixtures are installed
shall be equipped with an approved water supply system.
The water supply system for each building or structure shall be entirely separate and
independent of every water supply system serving any other building or structure, except as provided in Sections P801.2.1 through P-801.2.3.
Non-residential buildings and other structures on the same deeded property and
maintained under common ownership shall be permitted to connect to a common water supply.
Residential structures on a single lot shall be permitted to share a single-source water supply,
provided that each individual residential structure shall have its own master water supply shut-off for cold water
and, if hot water is obtained from a central source, each dwelling unit shall have its own individual cutoff for
domestic hot water supply. All residences on separate lots shall have separate water services.
Where one building stands in the rear of another building on an interior lot and a separate
water supply cannot be provided for the rear building through an alley, yard, or other open public space, the water
supply of the front building shall be permitted to serve the rear building, provided the water supply of the front
buildings is of adequate size and in suitable condition to serve both front and rear buildings. Such dual use requires
approval by the Department.