Established in 1996, the Navajo County Public Works Department provides a variety of maintenance and infrastructure services in Navajo County in the state of Arizona. The department is charged to construct, improve, repair and maintain county highways and streets and protect the lives and real property of citizens of Navajo County from flooding. Its other responsibilities include septic system construction and planning and zoning. The department serves more than 100,000 residents. The Navajo County Public Works Department is a part of the government of Navajo County in the state of Arizona.