City of Issaquah, Washington governs the Public Works Operations Department. The department specializes in maintaining streetlights and signals. It is also responsible for the City's water utility, encompassing production, distribution maintenance, planning and purity. The Department maintains the storm water system, with its culverts, creeks and ditches, as well as the sewer utility, which contains a collection system. Additionally, the Public Works Operations Department includes an equipment and fleet maintenance division through, which it maintains/replaces the City's equipment and vehicles.