35 Ill. Adm. Code 604.1500
Cross Connections
Section 604.1500Â Cross Connections
a)Â Â Â Â Â Â Â Â No
cross connection is allowed between water plant piping and any drain or sewer.Â
Backflow prevention installed within the water treatment facility must comply
with the Illinois Plumbing Code (77 Ill. Adm. Code 890).
b)Â Â Â Â Â Â Â Â No
cross connection is allowed whereby an unsafe substance may enter a community
water supply.
c)Â Â Â Â Â Â Â Â No
cross connection is allowed between any portion of a community water supply
distribution system and any other water supply that is not a community water
supply.