The Mission of the Department of Streets and Sanitation is to provide a safe and healthy environment on the streets and alleys of Chicago through the effective management of the collection, disposal and recycling of residential refuse, the sweeping and plowing of streets, the timely removal of graffiti, the cleaning of vacant lots, the demolition of garages, the efficient towing of illegally parked vehicles, the abatement of rodents and the planting, trimming and removal of trees, of which the finished product meets or exceeds the industry standards and best practices.