55 ILCS 5/5-12003
In those areas within the territory of a county with a population in excess of 500,000 and fewer than 3 million inhabitants, and outside any city, village or incorporated town, which are identified as "Special Flood Hazard Areas" under the terms and provisions of any ordinance adopted under this Division, the unauthorized excavation or filling of such an area by any person shall cause the county board to apply to the circuit court in that county for an order to remove the fill and restore the parcel to its natural elevation in order to lessen or avoid the imminent threat to the public health, safety or welfare and damage to property resulting from the accumulation or run-off of storm or flood waters. Where, upon diligent search, the identity or whereabouts of the owner of any such parcel, including lien holders of record, are not ascertainable, notice mailed to the person in whose name such real estate was last assessed for taxes, as shown by the county collector's books, constitutes sufficient notice under this Section. The hearing upon such application to the circuit court shall be expedited by the court and given precedence over all other suits. The cost of removal or restoration incurred by the county board is recoverable from the owner of such real estate and is a lien thereon, which lien is superior to all prior existing liens and encumbrances, except taxes; provided that within 60 days after such removal of fill or restoration of the parcel to its natural elevation, the county board shall file notice of lien for such cost and expense incurred in the office of the recorder of the county. The notice must consist of a sworn statement setting out (1) a description of the real estate sufficient for identification thereof, (2) the amount of money representing the cost and expense incurred, and (3) the date on which the cost was incurred by the county. Upon payment of the costs and expenses by the owner or persons interested in the property, the lien shall be released by the county in whose name the lien has been filed and the release may be filed of record. The lien may be enforced by proceedings of foreclosure as in the case of mortgages or mechanics' liens, which action must be commenced within 3 years after the date of filing notice of lien.
55 ILCS 5/5-12003