225 ILCS 320/1
It has been established by scientific evidence that improper plumbing can result in the introduction of pathogenic organisms into the potable water supply, result in the escape of toxic gases into the environment, and result in potentially lethal disease and epidemic. It is further found that minimum numbers of plumbing facilities and fixtures are necessary for the comfort and convenience of workers and persons in public places.
Consistent with its duty to safeguard the health of the people of this State, the General Assembly therefore declares that the regulation of plumbing and the plumbing trade is necessary for the protection of the public health, convenience, and welfare. The General Assembly therefore declares that individuals who plan, inspect, install, alter, extend, repair and maintain plumbing systems shall be individuals of proven skill. Further, the General Assembly declares that a guide for the minimum control and number of plumbing materials and fixtures, the design of plumbing systems, and the construction and installation methods of plumbing systems is essential for the protection of public health and convenience. In order to insure plumbing skill and to authoritatively establish what shall be good plumbing practice, this Act provides for the licensing of plumbers and registration of plumbing contractors and for the promulgation of a Minimum Plumbing Code of standards by the Department. This Act is therefore declared to be essential to the public interest.
225 ILCS 320/1