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Show PART II PRESENT STATUS The largest municipalities in the subregion and 1960 populations are Grand Junction, Colorado (18,694); Montrose, Colorado (5,044); Delta, Colorado (3,832); Gunnison, Colorado (3,477); and Moab, Utah (4,682). The 1963 PHS inventory listed 58 municipal systems in the subregion. The inventory showed that 36 municipal systems needed improvement to provide adequate water service. It was indicated that 4 municipal systems needed source improvement and 32 needed water treatment improvement. Moab, Utah and Gunnison, Colorado were listed as needing both groundwater source and treatment improvement. The extent of water treatment provided by subregional municipal systems is shown in Table 17. Table 17 - Municipal Water Treatment Upper Main Stem Subregion Type of Water Treatment Number of Municipal Systems More than disinfection Disinfection only None 18 20 20 58 Dissolved solids and heavy metals could cause water treatment problems for some nmnicipal supply systems in the subregion. Process water for food processing manufacturers in the subregion could also be undersirable because of these water quality parameters. An estimated population of 35,300, or 26 percent of the subregional population was served by rural-domestic systems. There are many rural communities in the subregion with populations greater than 50 which do not have central municipal systems. Some rural households are supplied with water from individual cisterns which are supplied by hauling or direct from irrigation ditches. San Juan-Colorado Subregion The 1965 San Juan-Colorado Subregion M&I withdrawal requirements supplied by various distribution systems are summarized in Table 18. Eighty percent of these requirements were supplied by surface water sources and the remainder by groundwater sources. 30 |