The Department of Public Works performs routine preventative maintenance of the City's public water and sewer systems. Sewer crews routinely clean and televise the City's separate and combined sanitary sewers and routinely clean the debris that collects in the sumps of the storm sewer catch basins. Water crews flush the water mains each year to help reduce any buildup in the City's water lines and check the working condition of the fire hydrants and water valves.