Ill. Admin. Code tit. 62, § 245.840 – Hydraulic Fracturing Fluid and Flowback Confinement

a) Hydraulic fracturing fluid shall be confined to the targeted formation designated in the permit.
b) If the hydraulic fracturing fluid or hydraulic fracturing flowback migrate into a fresh water zone or to the surface from the well in question or from other wells, the permittee shall immediately notify the Department and the county and certified local public health department (if any) and shut in the well until remedial action that prevents the fluid migration is completed. The permittee shall obtain the approval of the Department prior to resuming operations. (Section 1-75(d) of the Act)
c) Permittee shall be responsible for damages caused by the migration of hydraulic fracturing fluid or hydraulic fracturing flowback outside the targeted formation.