77 Ill. Adm. Code 890.1110
Quality of Water Supply
Section 890
Section 890.1110Â Quality of
Water Supply
All premises intended for human
habitation or occupancy shall be provided with a potable water supply. The
potable water supply shall not be connected to non-potable water and shall be
protected from backflow and back siphonage. (See Appendix I.Illustration A.)