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000336 . Most of the state's waters are hard, exceeding 150 mi Iligrams per liter (150 mg/I) as calcium carbonate. Most consumers object to water harder than this although their sensitivity is related to the hardness to which they have become accustomed. Ground Water Avai labi I ity and Qual ity by River BasJ.!12. White River-Hat Creek Basin - Ground water is not avai lable in quantities required to meet the municipal demands. Crawford obtains its water from the White River. Chadron depended upon a surface water supply from Chadron Creek unti I 1969, but has now developed a ground water supply in the Niobrara River Basin. The qual ity of ground waters over most of the Basin is "undesirable." Surface water qual ity is generally "usable" for domestic purposes. Niobrara River Basin - Ground water is plentiful except in Keya Paha, Boyd, and Knox Counties. The quality of ground water is generally "desirable" for domestic purposes, except in the lower portion of the Uasin where samples from wells and springs in ten communities show excess chomical substances, mostly iron and manganese combined. Outside the Sandhi lis the hardness is generally in excess of 150 mg/I. Missouri Tributaries River Basin - The quantity of ground water is limited over most of the Basin. The scarcity is particularly notice- able near the high population centers. The qual ity of the ground water is generally "undesirable," with samples from 22 comC'unities showing excessive iron and manganese combined. four showing excessive sulfates, two showing excessive sodium, and one showing excessive nitrates. Hardness is generally in excess of 150 mg/I. North Platte River Basin - Ground water avai labi Iity is adequate to plentiful. The quality is generally "usable," but excessive sodium and/or iron and manganese combined were found in samples of wel I water from nine communities. South Platte River Basin - The quantity of ground water is adequate. The qual ity is generally "usable," but samples of water from wells in five communities showed excessive chemical concentrations including four with excessive iron and manganese combined, one with excessive sulfates, and one with excessive sodium. Middle Platte River Basin - The quantity of ground water is plentiful. The quality is generally "desirable," but samples from wells in seven communities show undesirable characteristics; five with excessive iron and manganese combined and two with excessive sodium. Loup River Basin - Ground water is in plentiful supply. The quality ranges 'from "usable" to "desirable" with well samples from 16 communities showing excessive iron and manganese combined. 12