225 ILCS 330/1
The practice of land surveying in the State of Illinois is hereby declared to affect the public health, safety, and welfare and to be subject to regulation and control in the public interest. It is further declared that the determination and physical protraction of land boundaries using the appropriate application of boundary law principles, together with the attendant preparation of legal descriptions and plats, which bear witness for posterity to chronicle the acts and wishes of landowners throughout this State is a matter of public interest and concern. Therefore, it is in the public interest that the practice of land surveying, as defined in this Act, merit and receive the confidence of the public, and that only qualified persons be authorized to practice land surveying in the State of Illinois. This Act shall be liberally construed to best carry out this purpose.
225 ILCS 330/1