This is one of a series of maps that describe the geology and related natural resources in the Kaiparowits coal-basin area, Utah Published sources of water-quality data used in the preparation of this map included Iorns, Hembree, Phoenix, and Oakland (1964), Goode (1966, 1969), U.S. Bureau of Land Management (1976), and U.S. Geological Survey (1961-75). Sources of unpublished data include the U.S. Bureau of Reclamation and the Southeastern Utah Association of Governments. Some of the unpublished data was provided by Vaughn Hansen Associates of Salt Lake City, Utah, whose assistance is gratefully acknowledged.