225 ILCS 725/12
Any well for which a permit is required under this Act, other than a plugged well, which was drilled prior to the effective date of this Act and for which no permit has previously been issued, is required to be permitted. Application shall be made as required in subsection (2) of Section 6, except that the spacing requirements of Section 21.1 of this Act shall not apply, and no permit fee will be assessed for any such well if application for a permit is made within one year of the effective date of this amendatory Act of 1990. Except for Class II UIC wells, provisions of this Act and Department rules pertaining to well construction shall not apply. After this one year period, any unpermitted well to which this Section applies will be deemed to be operating without a permit and subject to the penalties set forth in this Act.
225 ILCS 725/12