77 Ill. Adm. Code 250.1970
Plumbing
Section 250
Section 250.1970Â Plumbing
All plumbing shall be designed,
installed, and maintained in accordance with the requirements of the Illinois
Plumbing Code (77 Ill. Adm. Code 890) except where that Code and these
requirements differ. For areas of difference, see Subpart T and Subpart U.