70 ILCS 405/3.12

"Land disturbing activity" means any change in land, which may result in soil erosion from water or wind and the movement of sediments into state waters or on to lands in the State, including but not limited to, the tilling, clearing, grading, excavating, rehabilitating, transporting, depositing or filling of land, other than federal lands. "Land disturbing activity" does not include such minor activities as home gardens, individual home landscaping, repairs, maintenance or any plat of subdivision approved by municipal or county units of government. This Act shall encourage the establishment of sediment and erosion control ordinances at the municipal and county levels.