77 Ill. Adm. Code 205.1630
Water System
Section 205
Section 205.1630 Water
System
a) Water systems shall be designed to supply water at sufficient
pressure to operate all fixtures and equipment during maximum demand periods.
b) Each water service main, branch main, riser, and branch to a
group of fixtures shall be valved. Stop valves shall be provided at each
fixture.
c) Approved backflow preventers or vacuum breakers shall be
installed on hose bibbs, laboratory sinks, janitors' sinks, and on all other
fixtures to which hoses or tubing are, or can be attached.
d) Water distribution systems shall be arranged to provide hot
water at each hot water outlet at all times.