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o "oJ \~:.) c.o -..l ~ into the lake by infiltration from an unsewered population. There is also concern about some localized turbidity problems caused, principally by urban runoff, private commercial develop- ment, and highway construction. As part of a continuing effort to hold Lake Tahoe's quality at its present level, municipal effluents from two developments located in the Lake Tahoe Basin are exported to the Carson River Basin. The difficulty of maintaining or restoring water quality is continually increasing because of the growing quantity of effluents that ate entering streams and the increasing depletions. As the result .of the projected population growth and economic expansion, future discharges into municipal and industrial wastewater treat- ment works are estimated to double--as measured by BOD--during the 1965-2020 period. In the Great Salt Lake subregion a 2-1/2 fold increase is. projected and would comprise about two-thirds of the regional BOD production by 2020. An estimated 750 million gallons per day of municipal and industrial wastewater would receive conventional secondary treat- ment by 2020, the minimum level required by the state-federal water quality standards. In some water-short areas, however, this leyel of treatment would not be adequate to protect water quality. Pollution control measures for the Jordan River area may include centralization of waste treatment with the addition of tertiary treatment, reuse of secondary effluents for industrial purposes or other measures. Detailed planning is required be- fore an optimum solution can be found. Tertiary wastewater treat- ment coordinated with land use zoning and sediment control are necessary for the protection of the recreational value of Utah Lake. betai1ed planning is needed to find the best means of obtaining these objectives. Further study is needed to define the water quality problems of the Great Salt Lake in order to develop criteria to protect this unique water resource. Advanced treatment to remove nutrients from municipal wastewaters is recommended for the Reno-Sparks area, the Lake Tahoe Basin, and the Carson City area. Tertiary treatment is presently being applied to part of the wastewaters originating in the Lake Tahoe Basin. Because of the complexity and patterns of water uses, the varied water quality requirements, the problems of managing the quality of terminal lakes, and the many legal and institutional constraipts imposed by fragmentation of authority and responsi- bility among the numerous governmental entities involved, de- tailed basinwide water quality control planning, financeable in part through provisions of the Federal Water Pollution Control Act, is urgently needed and recommended for the .first time period. Detailed basinwide planning for water quality management is recommended for the Jordan River, Utah Lake, Bear River, Weber River, Truckee River and Carson River basins. - ii