Lake County, IL Property Maintenance: Vacant Lot Maintenance (2026)

Lake County regulates vacant lot maintenance in unincorporated areas under Lake County Code of Ordinances Chapter 38 (Nuisances) and the Unified Development Ordinance (UDO) property standards. Weeds and rank vegetation over 8 inches are declared a public nuisance; owners receive written notice and typically 7-10 days to abate before the county mows and bills the owner under 55 ILCS 5/5-12001 authority. Refuse, tires, and construction debris must be removed under the Illinois Solid Waste Handling Law. Vacant structures must be secured against trespass per the county property maintenance provisions, and derelict buildings may be declared unsafe under 55 ILCS 5/5-1121. Stormwater detention on vacant parcels must still meet the Lake County Watershed Development Ordinance (WDO). Incorporated municipalities such as Waukegan (Code Ch. 22), Gurnee, Libertyville, and Mundelein enforce their own weed/grass limits (commonly 8 inches) under 65 ILCS 5/11-20-7. Unpaid abatement costs become a lien on the property and may be collected with property taxes.