225 ILCS 225/2
It is hereby declared that there exists, and may in the future exist, within the State of Illinois, private sewage disposal systems which are designed, constructed, operated, maintained or serviced or which may be designed, constructed, operated, maintained, or serviced in such a manner as to cause spread of infectious or contagious disease and such conditions adversely affect the public health, safety and general welfare of persons. Therefore, the purpose of this Act is to protect, promote and preserve the public health, safety and general welfare by providing for the licensing of private sewage disposal contractors and the establishment and enforcement of a minimum code of standards for design, construction, materials, operation and maintenance of private sewage disposal systems, for the transportation and disposal of wastes therefrom, and for private sewage disposal servicing equipment.
225 ILCS 225/2