The City of Tacoma Streets and Grounds Division oversees the maintenance of city streets, alleys, guardrails and steps, as well as repairs potholes. Located in Tacoma, Wash., the division maintains and repairs street signs. The City of Tacoma Streets and Grounds Division also installs and maintains streetlights in the city. It is a part of the City of Tacoma Public Works Department, which offers garbage collection and recycling services. In addition, the department issues several building permits. It disposes of hazardous wastes, as well as constructs bridges. The City of Tacoma Public Works Department operates various wastewater treatment plants that treat water for residential and commercial facilities.