65 ILCS 5/11-30-7

In municipalities of 500,000 or more inhabitants or municipalities lying wholly or partly within a radius of 30 miles from the corporate limits of municipalities of 500,000 or more inhabitants, the corporate authorities may prohibit the erection of buildings for habitation on any lot or parcel of land within the municipality, unless a highway, road, street or way for public service facilities improved with water mains and sanitary sewers is provided to serve the lot or parcel of land.