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0919 Scope All 338 samples collected during the 4-year study were analyzed for major anions, major cations, selenium, and arsenic. Water-quality data in this re- port are presented in two tables, and are keyed by numbers to site locations on plates 1 and 2. Analyses of ground-water samples, including springs, are summarized in table 1 at the back of the report. Analyses of surface-water samples collected from streams on the reservation are summarized in table 2 at the back of the report. Acknowledgments The authors express their appreciation to Mr. Leonard Burch, chairman of the Southern Ute Tribal Council, and to Mr. Chris A. Baker, vice chairman, for providing hydrologic field assistants who aided U.S. Geological Survey person- nel in the collection of basic data. Throughout the 4-year investigation, un- der the general guidance and assistance of Mr. John Williams, who represented the Southern Ute Tribal Council, Messrs. Everett Burch, Roderick Williams, Ivan Red, Elliott Cloud, and Raymond Frost helped obtain well data and sample wells. Their linguistic abilities in English, Ute, and Spanish proved to be of great assistance in discussing the investigation with the many land owners. Messrs. Raymond DeKay, Robert Tsiosdia, and officials and employees of the U.S. Bureau of Indian Affairs at Ignacio, Colo., and Albuquerque, N. Mex., provided administrative support during the investigation; laboratory support was provided by personnel at Gallup, N. Mex. RELATION OF DATA TO DRINKING-WATER STANDARDS The potability of ground water and surface water on the reservation can be determined by comparing the chemical data in tables 1 and 2 with the rec- ommended drinking-water-quality standards of the Colorado Department of Health (1971) and the U.S. Public Health Service (1962) presented on page IV at the front of the report and immediately below the column headings in tables 1 and 2. Many of the analyses indicated that some chemical constituents occur in excess of the standards. Although the concentrations of some constituents ex- ceed the standards, they do not necessarily indicate a health hazard. For ex- ample, high dissolved-solids concentrations may impart a noticeable taste to the water supply_ High iron and manganese concentrations may cause coloring of utensils and fixtures and impart a disagreeable taste to water. High flu- oride concentrations can cause permanent discoloration and mottling of chil- dren1s teeth. However, in proper concentrations, fluoride can prevent tooth decay. Magnesium and sulfate concentrations in excess of the standards may have a laxative effect on people. Concentrations of selenium, arsenic, nitrate, and nitrite-pIus-nitrate as nitrogen in excess of the standards can constitute a health hazard (Colorado Department of Health, 1971, and U. S. Public Health Service, 1962). Selenium 3