50 ILCS 805/5
Municipalities or counties that have adopted Local Land Resource Management Plans and that wish to receive planning grants and to use the additional powers and authorities established under this Act shall also adopt:
(4) A system and timetable to review and update the plans at least once every 10 years.
In the case of municipalities and counties that have adopted joint or compatible plans, such ordinances and programs shall be parallel and coordinated between the local jurisdictions.
(from Ch. 85, par. 5805)
(Source: P.A. 84-865.)