Ashley Valley Water & Sewer Improvement District is a local district formed by Uintah County to furnish water and sewer service to the unincorporated area outside Vernal City including incorporated Naples City. It was formed in 1974 under title 17, chapter 6 Utah Code. In 1982 it began to operate and service the area outside the city, this area was formally operated by Vernal City and Naples City. The original water system was built in 1962 by the Bureau of Reclamation as part of the Central Utah Water Steinaker Project, and the lines put in by Naples and Glines before 1962. The service area covers from 3300 north to 5800 south and 3500 west to 3500 east, an area of 9 miles by 7 miles and just over 160 miles of potable water line. The sewer system was built in 1982 as part of an EPA project. Ashley Valley Water & Sewer, Vernal City and Maeser Water Improvement District built lagoons and a joint sewer lagoon system, later replaced by an oxidation ditch treatment plant. Ashley Valley currently has over 3,400 sewer connections and over 5,000 water connections.