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'OU1297 6 Approximate current annual water requirement for municipal and industrial uses in Arizona is 350,000 acre-feet. If present per capita rates of use for these purposes remains about the same, reasonable projections indicate a municipal and industrial water requirement of about 750,000 acre-feet annually by the year 1980, and well over 1,000,000 acre-feet by the year 2000. THOSE SWIMMING POOLS Contrary to a popular tourist impression, Arizona's 20,000 outdoor swim- ming pools do not consume large quantities of water. The average pool contains 17,000 gallons, and the water is recirculated through filters. They are emptied and refilled only once every five years, under normal conditions. Swimming pools provide healthful family recreation at home for nearly 12 months of the year in the Southwest, and their cost is low enough to appeal to average income families. Pools are concentrated in cities where water is metered. PLANNING FOR MORE REUSE Sound management of municipal water includes control, treatment and disposal of return flow to conserve the resource to the fullest extent that is economi- cally and socially feasible. Normally about 50%. of the water delivered by a muni- cipal system is discharged as sewage. Although about 25,000,000 gallons of treated sewage outflow per day from the Tucson and Phoenix metropolitan areas are used for irrigation of non-food farm crops, and a considerable amount in addition helps recharge ground water, much remains to be done to conserve municipal outflow in Arizona. Since total municipal and industrial use of water in the State is 350,000 acre-feet per year, there is a theoretical outflow of nearly 175,000 acre-feet to be reclaimed for reuse. Of this theoretical amount only about 30,000 acre-feet annually are currently directly reused. HoWever, whether by design or otherwise, the major portion of the sewage not directly reused finds its way to the ground water and constitutes a significant portion of the present recharge. Since ground water is the source of most all municipal supplies in Arizona, the use of sewage, even though treated, for ground water recharge by injection through wells directly into aquifers must be approached with extreme caution. However, extensive research related to salvage and reuse of treated sewage is being conducted by the State's universities, the cities of Tucson and Phoenix, the Salt River Project, the State Department of Health, and other agencies. This source of water for reuse in Arizona is expected to be about 500,000 acre-feet annually by the year 2000, and the Central Arizona Project includes planning for full utilization of the resource. This assumes, of course, that the problem of eliminating the hazard of viruses in treated sewage can be resolved. This source of water would be the cheapest additional supply available in Central Arizona, which assures its economic use as soon as possible.