77 Ill. Adm. Code 330.2630
Sewage Disposal
Section 330
Section 330.2630 Sewage
Disposal
a) All sewage and liquid wastes shall be discharged into a public
sewage system when available. (B)
b) When a public sewage system is not available, sewage and
liquid wastes shall be collected, treated, and disposed of in a private sewage
disposal system. The design, construction, maintenance, and operation of the
system shall comply with the "Private Sewage Disposal Code" (77 Ill.
Adm. Code 905). (B)