Ill. Admin. Code tit. 35, § 618.200
This Subpart describes maximum setback zones for individual community water supply wells in the interest of securing the public health, safety, and welfare; to preserve the quality and quantity of groundwater resources in order to assure a safe and adequate water supply for present and future generations; and to preserve groundwater resources currently in use and those aquifers having a potential for future use as a public water supply.
(Source: Amended at 47 Ill. Reg. 7708, effective May 16, 2023)